Method and composition for modifying soil and dust control

Information

  • Patent Grant
  • 8419312
  • Patent Number
    8,419,312
  • Date Filed
    Friday, June 29, 2012
    12 years ago
  • Date Issued
    Tuesday, April 16, 2013
    11 years ago
Abstract
A composition for chemical improvement of soil and road base materials including an aqueous solution of a water repellant and an aqueous emulsion of a soil stabilizer and dust retardant is herein disclosed.
Description
II. BACKGROUND

This invention generally relates to methods and compositions for improving the strength and longevity of secondary roadways through environmentally sound practices; specifically, improved dust suppression, soil stabilization, and water repellency.


The engineering and construction of secondary roads (hereafter, “gravel roads,” “earth roads,” or “unpaved roads”) has been perpetually plagued by two interrelated problems: the deterioration of the road due to water, and the loss of surface cohesion and road compaction due to traffic. The deleterious effects of water on roadways, in particular, are well documented in the prior art. In cold weather, moisture that penetrates a road's base layers freezes and rips cracks into the road substrate that seriously undermine the load bearing capacity and longevity of the roadway. Likewise, in milder weather, when water seeps into the road's base layers it results in softening and erosion that causes potholes that are an expensive and recurring problem. And if the potholes are not immediately repaired, they fill with water and further exacerbate the deterioration of the roadway.


The impact of water on secondary roads such as rural roads, access roads, field and forestry roads, or mountain roads is especially pronounced because the quality of the surfacing materials is lower than in an asphalt paved road, for example, and thus provides reduced surface protection from the elements. Additionally, because of capillary action, water also seeps into the road base from the sides and bottom of the road's base or sub-base. Compared to sealed or “paved” roads, which require large machinery to pour concrete or to lay and smooth a bitumen-based surface, secondary unpaved roads are relatively easy and inexpensive to build. But unpaved roads require much more frequent maintenance—particularly after wet periods or when faced with increased traffic—and are generally prone to other problems not associated with paved roads.


For example, many secondary roads—of either an earth or gravel variety—utilize native soils, often in conjunction with gravel quarried from local resources, to create the road's sub-base and base layers. Unfortunately, native soils and gravel are not always of suitable quality, resulting in a road base with diminished physical and mechanical properties. When secondary roads are constructed of poor road base materials, routine maintenance is not strictly employed, and the road is exposed to heavy moisture and/or traffic, the erosion of the road—due to damage to the road surface, sub-base, and base materials—is hastened.


Defects in road surfaces are typically classified into two categories: surface deterioration and surface deformation. While surface deterioration is related mostly to the quality of the surfacing materials and the way they respond to weather or traffic stresses, surface deformations often have combined causes that include both stresses to the road surface itself and other factors such as sub-base and base capacity and stability.


Surface deterioration is exemplified by “dust,” the result of loss of fine binder material from road surfaces. Dust is a substantial problem for secondary roads, as the loss of these fine materials leads to other types of road distress such as loss of cohesion and compaction of the road fill material, and reduced capacity to maintain the requisite moisture in the road fill.


Surface deformations include ruts, corrugations, depressions, and potholes. Ruts are longitudinal depressions in the wheel paths caused by high moisture content, inadequate strength in the subsurface soil or base, inadequate surface course thickness, or heavy traffic loads. Corrugating or “washboarding” is a series of ridges and depressions across the road surface caused by lack of surface cohesion. Depressions are localized low areas one or more inches below the surrounding road surfaces that are caused by settlement, excessive moisture content, and/or improper drainage. Potholes are small depressions or voids in the road surface one or more inches deep which are caused by excessive moisture content, poor drainage, weak sub-base or base, poorly graded aggregate, or a combination of these factors.


As such, the problems typically associated with secondary roads—both surface deterioration and deformation—are caused by: 1) the harmful effects of water and high moisture content, including settlement and erosion, on the road surface and base. 2) the lack of surface cohesion and resulting loss of road compaction caused by dust, and 3) the heavy traffic loads exerted on roads with weak or inadequate soil, sub-base, or base.


Industry has provided for the addition of various chemical additives to impart water repellency on road materials, with varying degrees of success and environmental impact. However, water repellant chemicals are not binders, and load bearing capacity and stability are not improved by their application to the soil or road base. In many cases, dust can also be reduced on gravel roads by applying chemical additives (commonly known in the art as “dust suppressors” or “dust retardants”) which draw moisture from the air to improve fine aggregate cohesion. And “soil stabilizers,” which are chemicals designed to act as binders and coalesce forming bonds between the soil or aggregate particles, have shown promise in greatly improving the load bearing and traffic capacity of the road. But existing soil stabilizers and dust retardants are difficult to apply and use in cold climates, tend to have long cure times, short life-cycles, and do not provide the requisite protection against water damage; particularly excessive moisture content resulting from capillary action.


Therefore, a single chemical composition capable of resisting the aforementioned problems—by providing water repellency for reduced moisture content, dust retardant for improved surface cohesion, and soil stabilizers for improved load bearing and traffic capacity—would be of great utility in the field of art; particularly if the chemical composition could be applied in an economical and environmentally sound manner. Although road builders have long employed soil additives as a mechanism for preventing and avoiding surface deteriorations and deformations, formulating a combination of chemicals and a methodology for applying the chemical additives in a cost-effective manner has proved elusive. Specifically, although various chemicals have been provided for binding road base materials together for improved strength and load bearing capacity and for repelling water from the road surface, previous efforts have thus far failed to provide an environmentally appropriate solution to the secondary road erosion and maintenance issues that have long plagued the art. Thus, there is a need in the art for improved compositions that provide extraordinary increases in load bearing capacity, outstanding dust retardant capabilities, superior water repellant properties, and can be administered in a single application phase. Such an improved composition could provide an engineered stabilized water repellant road base and surface topping for earth or gravel roads; or, it could prepare a road sub-base or base for chip sealing, paving, or milling applications.


Repairing damaged roadways by conventional methods can be extremely expensive, time consuming, and environmentally disruptive because the entire compacted gravel layer of the road must be replaced. Excavating the roadbed of a 1-km portion of road measuring 4 m in width produces about 2000 cubic meters (m3) of earthy waste; in a conventional road bed repair project, this would require roughly 220 truckloads of waste to be removed from the worksite, with 220 truckloads of new gravel being shipped back the worksite to complete the project. In isolated locations, or locations with difficult terrain, the expense of removing and later replacing the gravel is exorbitant—as is the impact on local residents (who must cope with noise and air pollution), normal users of the roadway (who experience detours or extended delays during repair), and the landfills that store the removed waste.


As a result, there is a need in the art for a single phase chemical treatment method that incorporates soil stabilization, dust retardant, and water repellant chemicals into native soils. With such a single phase treatment option, road builders will be able improve the longevity of the roadway, impart increased load bearing and traffic capacity, and reduce the time, costs, and environmental impact associated with conventional road repair projects.





III. BRIEF DESCRIPTION OF THE DRAWINGS

At least one embodiment of the invention is set forth in the following description and is shown in the drawings and is particularly and distinctly pointed out and set forth in the appended claims.



FIG. 1 shows a pulvimixer;



FIG. 2 shows a side view of the pulvimixer, wherein the soil or road base materials are being pulverized, sprayed, and mixed with the chemical composition of the present invention.



FIG. 3 shows a perspective view of the pulvimixer;



FIG. 4 shows a graph showing additive impact on dry strength;



FIG. 5 shows a graph showing dry strength;



FIG. 6 shows a graph showing wet strength; and,



FIG. 7 shows a graph showing hydraulic conductivity.





IV. SUMMARY

Accordingly, several objects and advantages of the present invention are the provision of a single chemical soil or road base material improvement composition that imparts extraordinary dust control, soil stabilization, and water repellency properties onto native soils or other road base materials.


Additionally, the present invention provides a method for a single application phase treatment of soil or road base materials characterized by reduced cure time, decreased road construction time, reduced environmental impact (by virtue of reduced construction waste and traffic), a wider range of effective use temperatures, a long life cycle, and a stronger more dust resistant roadway.


Other benefits and advantages will become apparent to those skilled in the art to which it pertains upon reading and understanding of the following detailed specification.


V. DETAILED DESCRIPTION

In one embodiment of the present invention, a composition for improving the properties of soil or other road base materials is provided. Specifically, a blended mixture of the chemical composition detailed below is capable of improving the dust retardant, water repellant, and soil stabilization properties of soil or other road base materials. Incorporating the chemical improvement composition into soil, or other road base materials, and then compacting, provides superior resistance to surface deformations and deterioration by increasing the load-bearing strength—in some cases, as much as 500%—of the roadway, greatly reducing dust caused by traffic or weather, and eliminating capillary water uptake that results in moisture damage to the road. This invention is an improvement over traditional methods because it provides a composition that can be applied in a single application phase, under a wide range of ambient temperatures and conditions, to resolve all of the above problems in the field of art.


The composition for chemical improvement of soil or road base materials is comprised of an aqueous solution of a water repellant in combination with an aqueous emulsion of a soil stabilizer and dust retardant. In one embodiment of the present invention, the characteristics of the composition for chemical improvement of soil or road base materials can include an aqueous solution of a water repellant that comprises about 1.0% to about 5.0% by weight (including, but not limited to, 1, 2, 3, 4, and 5) of potassium hydroxide; about 10.0% to about 30.0% by weight (including, but not limited to, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30) of potassium methylsiliconate; and about 65.0% to about 89.0% by weight (including, but not limited to, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, and 89) of water. In yet another embodiment of the invention, instead of the aforementioned potassium methylsiliconate, the aqueous solution of a water repellant comprises about 10.0% to about 30.0% by weight (including, but not limited to, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30) of sodium methylsiliconate.


In one embodiment of the present invention, the characteristics of the composition for chemical improvement of soil or road base materials can include a dust suppression and/or soil stabilization composition that is an aqueous emulsion comprising about 5.0% to about 60.0% by weight (including, but not limited to, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 and 60) of polyacrylic acid and polyvinyl acetate and 40.0% to about 95.0% by weight (including, but not limited to, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, and 90) of water. It is to be understood that this embodiment could consist of straight acrylic, straight polyvinyl acetate or an SBR (styrene butadiene rubber), all in blends, copolymers, or homopolymers.


In another embodiment of the invention, the composition for chemical improvement of soil or road base materials can comprise about 2.5% to about 30.0% by weight (including, but not limited to, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30) of polyacrylic acid and polyvinyl acetate polymer; about 0.5% to about 2.5% by weight (including, but not limited to, 0.5, 0.6, 0.7, 0.8, 0.9, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, and 2.5) of potassium hydroxide; about 5.0% to about 15.0% by weight (including, but not limited to, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15) of potassium methylsiliconate; and about 52.5% to about 92.0% by weight (including, but not limited to, 52.5, 52.6, 52.7, 52.8, 52.9, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, and 92) of water.


In yet another embodiment of the invention, the composition for chemical improvement of soil or road base materials can comprise about 3.75% to about 45.0% by weight (including, but not limited to, 3.75, 3.76, 3.77, 3.78, 3.79, 3.8, 3.9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, and 45) of polyacrylic acid and polyvinyl acetate polymer; about 0.25% to about 1.25% by weight (including, but not limited to, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.20, 1.21, 1.22, 1.23, 1.24, and 1.25) of potassium hydroxide; about 2.5% to about 7.5% by weight (including, but not limited to, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 4, 5, 6, 7, 7.1, 7.2, 7.3, 7.4, and 7.5) of potassium methylsiliconate; and about 46.25% to about 93.5% by weight (including, but not limited to, 46.25, 46.26, 46.27, 46.28, 46.29, 46.3, 46.4, 46.5, 46.6, 46.7, 46.8, 46.9, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93.0, 93.1, 93.2, 93.3, 93.4, and 93.5) of water.


In still another embodiment of the invention, the composition for chemical improvement of soil or road base materials can comprise about 1.25% to about 15.0% by weight (including, but not limited to, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15) of polyacrylic acid and polyvinyl acetate polymer; about 0.75% to about 3.75% by weight (including, but not limited to, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.9, 1, 2, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.70, 3.71, 3.72, 3.73, 3.74, and 3.75) of potassium hydroxide: about 7.5% to about 22.5% by weight (including, but not limited to, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22.0, 22.1, 22.2, 22.3, 22.4, and 22.5) of potassium methylsiliconate; and about 58.75% to about 90.5% by weight (including but not limited to, 58.75, 58.76, 58.77, 58.78, 58.79, 58.8, 58.9, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90.0, 90.1, 90.2, 90.3, 90.4, and 90.5) of water. It is to be understood that this embodiment could comprise mixtures, copolymers, or homopolymers of acrylics, polyvinyl acetates, styrene butadiene rubbers, and styrene acrylics.


In still other embodiments of the present invention, the dust suppression and/or soil stabilization portion of the composition can also include an emulsifier. Furthermore, in certain embodiments of the invention, the polyacrylic acid and/or polyvinyl acetate can comprise a mixture of homopolymers, or can comprise one or more copolymers. Some embodiments may include styrene butadiene rubber and related compositions, copolymers, and/or derivatives thereof. The chemical compositions described above are manufactured using conventional manufacturing equipment. Conventional mixers, emulsifiers, or colloid mills are utilized to blend these components into stable heterogeneous mixers or emulsions.


According to embodiments where the polyacrylic acid and/or polyvinyl acetate components comprise homopolymers, the homopolymer components can be present in ratios from about 1:1 to about 1:10,000 by mass of polyacrylic acid to polyvinyl acetate; or, from about 1:1 to about 1:10,000 by mass of polyvinyl acetate to polyacrylic acid.


According to embodiments where the polyacrylic acid and/or polyvinyl acetate components comprise one or more copolymers, the copolymers can comprise random copolymers, block copolymers, graft copolymers and the like or any combination thereof. Furthermore, the ratio of acrylic acid units to vinyl acetate units within a copolymer can comprise from about 1:1 to about 1:10,000 by mass of acrylic acid units to vinyl acetate units; or, from about 1:1 to about 1:10,000 by mass of vinyl acetate units to acrylic acid units.


Regardless of whether the embodiment comprises homopolymers and/or copolymers, each polymer component can be present in a wide variety of molecular weights and polydispersities thereof. For instance, suitable molecular weight ranges can comprise from about 103 to about 104 g/mol, from about 104 to about 105 g/mol, from about 105 to about 106 g/mol, from about 106 to about 107 gμmol, from about 107 to about 108 g/mol, from about 108 to about 109 g/mol, or even from about 109 to about 1010 g/mol. Here, as elsewhere in the specification and claims, ranges may be combined. Furthermore, the foregoing molecular weight ranges can be calculated according to any method known in the art including, without limitation, weight average molecular weight and number average molecular weight. One of skill in the art will recognize that the numerical value of a polymer molecular weight differs according to the calculation method.


A composition according to the aforementioned embodiments can comprise a dust suppression, soil stabilization, and/or water repellant composition that can, for instance, be applied to unpaved road surfaces (either soil, earth, dirt, gravel, or other conventional aggregate substances). Such compositions may decrease the amount of dust caused by wind erosion or generated by vehicles operating on the unpaved surface. Other embodiments can alternatively or additionally comprise a soil stabilization composition that increases the California Bearing Ratio (CBR value) and R-value of the soil or road base. In still other embodiments, the composition can alternatively or additionally comprise a water repellant component that eliminates, or greatly reduces, capillary water uptake into road surfaces, bases, and sub-bases. Accordingly, such compositions can increase the weight-bearing capacity of an unpaved road surface, prevent erosion thereof, prevent water uptake thereof, or otherwise enhance the mechanical characteristics of the soil to which it is applied.


In several embodiments of the present invention, methods for improving soil or road base materials are provided. In one embodiment, a heterogeneous mixture of an aqueous solution of a water repellant and aqueous emulsion of a soil stabilizer and dust retardant—according to the various chemical embodiments described above—is provided and applied to soil or road base materials (thereafter, “treated soil or road base materials”). As used in this patent application, the term “soil” is broadly used to describe the top layer of the earth's surface, consisting of rock and mineral particles mixed with organic matter (also known as, by non-limiting reference, earth or dirt); whether originally located at the road construction site (“native soil” or “in situ soil”) or transported to the road construction site. As used in this patent application, the phrase “road base materials” is broadly used to describe any substance from which a road surface, base, or sub-base could be constructed; including, but certainly not limited to by this non-limiting reference, rock, broken rock, gravel (whether pebble, granule, or other size or mixture), sand, cobble, slag, or other construction aggregate or fill material. In these embodiments, the material being treated is graded prior to application. Soil high in organic matter, because it is not cohesive, creates some difficulties establishing the reaction necessary to render the soil hydrophobic. The manner of composition application can include any method chosen with sound engineering judgment; but in most instances, application of the chemical agent to the soil is accomplished by the use of conventional spray equipment (spray trucks). The agent is gravity fed or pumped through hoses, spray nozzles, or fixed sprayers and evenly applied to the soil or material to be treated.


In some embodiments of the invention, the soil or road base materials are scarified (ripped open)—in this embodiment, to a depth of about 4-6 inches (10.16 cm-15.24 cm)—by conventional road construction graders (particularly graders with rake attachments) prior to application of the soil or road base material chemical improvement composition. This has the effect of allowing the composition to penetrate and permeate the soil or road base material to a greater degree. Once applied, the composition penetrates into the soil or road base materials where particle weighting and loading mechanisms achieved through the processes of adsorption, prompt adherence of molecules to the surface of particles and absorption and penetration of the substance into the inner structure of the particles. The water repellant portion of the composition reacts with minerals in the soil or road base materials and rapidly forms a hydrophobic silicone resin network that does not close pores in the substances, but rather permits the road to “breathe” in spite of water repellant properties. During the inventive process, evaporation of water occurs. The polymers of the aqueous acrylic polymer emulsion coalesce and form an intimate bond with the soil upon evaporation of the water. The sodium silicate and potassium silicate in water uses cohesion of the soil particles to form discrete hydrophobic silicone networks.


In one embodiment of the invention, the treated soil or road base materials are graded and compacted, using any means chosen with sound engineering judgment, and atop coat of the composition is applied. Motor-graders, asphalt grinders, mixers, pug mills, compactors, rollers, and other conventional construction equipment may be utilized to blend, set grade, and compact stabilized base, if necessary, as described in herein. A top coat is defined broadly as any application of the soil or road base materials chemical improvement composition that is applied after compaction.


In one embodiment, penetration is dramatically improved by mechanically mixing the chemical composition into soil or road base materials during the application step. The mechanical mixing process can include, but is not limited to, the use of a specialized machine called a “pulvimixer” (The pulvimixer consists of an engine which directly drives a toothed rotor, whose teeth are replaced when they are damaged. In one embodiment, the rotor is horizontal and turns at a rate of 100 to 200 rpm in the opposite direction to the machine's direction of travel and digs into the soil to depth of 500 mm, mixing the binder (enhanced polymers) thoroughly with the clays or silts that make up the soil. This technique allows soils to be exploited structurally). The pulvimixer mechanically mixes the composition with the soil or road base materials by simultaneously: 1) scarifying the soil or road base materials, which when accomplished by a pulvimixer can additionally include breaking up (pulverizing) large pieces of stone or road topping in a mixing chamber; (2) applying the chemical improvement composition; (3) thoroughly mixing the chemical improvement composition with the pulverized soil or road base material; and (4) grading the treated soil or road base material. This single application phase method prepares the treated soil or road base material—which is now a thoroughly mixed, homogeneous, well-graded roadbed—for leveling and compaction. In some embodiments of the invention, a top coat is then applied to the mechanically mixed and compacted soil or road base materials. In other embodiments, a surface course is applied to the compacted soil or road base materials prior to application of the top coat. A surface course can include any combination of road surface materials used in the art; including, but not limited to, asphalt concrete and bituminous surface treatments such as chip seal.


Effective application amounts of some embodiments can comprise from about 1 liter per cubic meter of soil (i.e. 1 L/m3) to about 10 L/m3, from about 10 L/m3 to about 20 L/m3, from about 20 L/m3 to about 30 L/m3, from about 30 L/m3 to about 40 L/m3, from about 40 L/m3 to about 50 L/m3, from about 50 L/m3 to about 60 L/m3, from about 60 L/m3 to about 70 L/m3, from about 70 L/m3 to about 80 L/m3, from about 80 L/m3 to about 90 L/m3, from about 90 L/m3 to about 100 L/m3, or even greater than 100 L/m3.


The proper application of the chemical compositions for improvement of soil or road base materials of the present invention, particularly using the methodologies described above, greatly improves the load bearing strength of unpaved roads, makes them virtually resistant to the damaging effects of capillary water uptake and water erosion, and provides superior dust retardant properties—under a wider range of effective application and use temperatures—than any composition in the prior art. Moreover, the chemical compositions described and claimed herein can be applied in a single phase to native soils, and due to reduced cure times the result is decreased road construction time, reduced environmental impact (by virtue of reduced construction waste and traffic), and a longer life cycle.


With reference now to FIGS. 4-6, standard lab mix of well graded limestone was used to prepare all unconfined compressive strength (UCS) cores. All samples were prepared using standard lab practices for making UCS cores. All samples were dried at 104° F. (219° C.) for 48 hours. Dry UCS cores were broken after six hours at room temperature. Wet UCS cores were broken after 48 hour soak in room temperature tap water, immediately after removal from water bath. Standard UCS cores are typically three inches (7.62 cm) in diameter and compacted to a four inch (10.16 cm) depth. Application rates of polymer (PBs) are based on surface area. In these embodiments, Water Armour® a sodium silicate and potassium silicate in water) was applied at a rate of 8 L/m3 on all samples. In FIG. 4 the graph shows the impact of the addition of each of the additives, alone and together, on the UCS strength of standard limestone. The Water Armour® alone has a negative impact on the strength of the cohesive limestone mix. The addition of polymer alone and polymer and Water Armour® substantially increase the UCS values.


In FIG. 5, the graph shows that the addition of Water Armour® to the polymer has a negligible impact on the strength of the polymer/limestone mix alone. In FIG. 6, the graph shows that the addition of Water Armour® has a positive impact on the wet strength of the polymer/limestone mix. Testing shows at least a 17% increase in wet strength. Below is a table showing the results of the tests on the graphs.










TABLE 1







Dry SS/WA
Wet SS/WA












1 gallon/
1 gallon/
1 gallon/
1 gallon/
1 gallon/
1 gallon/


10 ft2
50 ft2
100 ft2
10 ft2
50 ft2
100 ft2





7965
2584
1559
2044
378
358


7672
2391
1817
2044
436
384


6122

1445
2498
573
356


Avg.: 7253
2488
1607
2195
462
366





SS—Soil Sement ® (an aqueous acrylic vinyl acetate polymer emulsion


WA—Water Armour ®














TABLE 2







Dry SS 40% solids
Wet SS 40% solids












1 gallon/
1 gallon/
1 gallon/
1 gallon/
1 gallon/
1 gallon/


10 ft2
50 ft2
100 ft2
10 ft2
50 ft2
100 ft2















8282
2019
1557
1090
444
258


7886
1835
1575
639
370
234


8363
2179
1666
709
318
278


7738
2143
1941
725
460
210


6920
1965
1652
907
315
323


Avg.: 7838
2028
1678
814
381
261









Along with the testing shown in Tables 1 and 2, a control of water only was also run at 1 gallon per 10 square feet, with a result of 1050. Also, a control of 8 L of Water Armour® was also run with a result of 166.


In one example, aqueous acrylic vinyl acetate polymer emulsion was mixed and blended with the soil. A container had 3200 gallons (12,113 liters) of the emulsion diluted to 11 to 1 with water. The scarified road was very dry through the entire 6-8 inch (15.24 cm-20.32 cm) depth. The emulsion soaked into the material. Another coat was applied, which soaked in even slower. The following day, the first section looked good. The ruts were almost not visible. A total of 550 gallons (2082 liters) had been applied to this first section, which was the 40% solids section. A second section was the 50% solids section, which was also 250 m×4.5 m. This section had 605 gallons (2290 liters) applied at 50%.


On the second day, sections 1 and 2 looked good after light traffic. Both sections appeared still at least damp, but held firm. A third section would have both the emulsion and Water Armour® applied. This section was 100 m×4.5 m and was 6 inches (15.24 cm) deep. Approximately 100 gallons (376 liters) of Water Armour® was mixed with 275 gallons (1041 liters) of the emulsion and filled the rest of the 3200 gallon (12,113 liters) tank with water. This was applied to the material. When it was dry a second coat was applied. Material was very tight and had an even, white sheen.


With reference now to FIG. 7, the hydraulic conductivity of the mixture of the aqueous emulsion and the water repellant has a significantly decreased hydraulic conductivity, leading to a greater resistance to water than either the water repellant or the aqueous emulsion alone. The degree to which the water resistance was increased by the combination was a surprising result. The combination of the emulsion and water repellant fills in additional voids left by either the water repellant or aqueous emulsion alone.


The embodiments have been described, hereinabove. It will be apparent to those skilled in the art that the above methods and apparatuses may incorporate changes and modifications without departing from the general scope of this invention. It is intended to include all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof. Although the description above contains much specificity, this should not be construed as limiting the scope of the invention, but as merely providing illustrations of some of the present embodiments of this invention. Various other embodiments and ramifications are possible within its scope.


Furthermore, notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

Claims
  • 1. A composition for chemical improvement of soil and road base materials, the composition comprising: an aqueous solution of a water repellant; and,an aqueous emulsion of a soil stabilizer and dust retardant, wherein the aqueous solution and aqueous emulsion have polymer components, wherein the polymer components have a molecular weight range of about 103 g/mol to about 1010 g/mol.
  • 2. The composition of claim 1, wherein the water repellant comprises about 0.25% to about 5.0% by weight of potassium hydroxide, about 10.0% to about 30.0% by weight of a methylsiliconate chosen from the group comprising potassium methylsiliconate and sodium methylsiliconate, and about 65.0% to about 89.0% by weight of water.
  • 3. The composition of claim 2, wherein the aqueous emulsion of a soil stabilizer and dust retardant comprises: about 5.0% to about 60.0% by weight of polyacrylic acid and polyvinyl acetate; and,about 40.0% to about 95.0% by weight of water.
  • 4. The composition of claim 3 wherein the composition further comprises an emulsifier.
  • 5. The composition of claim 4, wherein the polyacrylic acid and polyvinyl acetate comprises a mixture of homopolymers.
  • 6. The composition of claim 4, wherein the polyacrylic acid and polyvinyl acetate comprise a blend of copolymers.
  • 7. The composition of claim 4, wherein the blend of polyacrylic acid and polyvinyl acetate copolymers includes styrene butadiene rubber.
  • 8. The composition of claim 4, wherein the aqueous emulsion comprises: about 3.75% to about 45.0% by weight of polyacrylic acid and polyvinyl acetate polymer; and the water repellant comprises:about 0.25% to about 1.25% by weight of potassium hydroxide;about 2.5% to about 7.5% by weight of potassium methylsiliconate; andabout 46.25% to about 93.5% by weight of water.
  • 9. The composition of claim 4, wherein the aqueous emulsion comprises: about 1.25% to about 15.0% by weight of polyacrylic acid and polyvinyl acetate polymer; and the water repellant comprises:about 0.75% to about 3.75% by weight of potassium hydroxide;about 7.5% to about 22.5% by weight of potassium methylsiliconate; andabout 58.75% to about 90.5% by weight of water.
  • 10. A method for soil stabilization, the method comprising the steps of: (A) providing a composition comprising a heterogeneous mixture of an aqueous solution of a water repellant and an aqueous polymer emulsion of a soil stabilizer and dust retardant wherein the polymer components have a molecular weight range of about 103 g/mol to about 1010 g/mol;(B) scarifying associated soil or road base materials;(C) applying the composition to soil or road base materials; and,(D) allowing the composition to penetrate the soil or road base materials, wherein particle weighting and adsorption promote adherence of molecules to the surface of soil or road base particles.
  • 11. The method of claim 10, wherein the water repellant reacts with associate minerals in the soil or road base materials to form a hydrophobic silicone resin network.
  • 12. The method of claim 11, wherein the hydrophobic silicone resin network does not close pores in the soil or road base materials.
  • 13. The method of claim 10, wherein the aqueous emulsion comprises water, polyacrylic acid, and polyvinyl acetate.
  • 14. The method of claim 13, wherein the polymers of the emulsion coalesce to form a bond with the soil or road base materials upon evaporation of water.
  • 15. The method of claim 10, wherein the water repellant comprises potassium hydroxide, a methylsiliconate chosen from the group comprising potassium methylsiliconate and sodium methylsiliconate, and water.
  • 16. The method of claim 15, wherein the methylsiliconate uses cohesion of the soil particles to form discrete hydrophobic silicone networks.
  • 17. The method of claim 10, wherein the soil or road base material is scarified to a depth of about 4 to about 6 inches by road construction graders.
  • 18. The method of claim 10, wherein the application of the composition increases the California Bearing Ratio and R-value of the soil or road base materials.
  • 19. The method of claim 15, wherein the composition is applied in an amount chosen from the group comprising about 1 L/m3 to about 10 L/m3, about 10 L/m3 to about 20 L/m3, about 20 L/m3 to about 30 L/m3, about 30 L/m3 to about 40 L/m3, about 40 L/m3 to about 50 L/m3, about 50 L/m3 to about 60 L/m3, about 60 L/m3 to about 70 L/m3, about 70 L/m3 to about 80 L/m3, about 80 L/m3 to about 90 L/m3, and about 90 L/m3 to about 100 L/m3.
  • 20. The method of claim 10, wherein the composition is applied in an amount greater than about 100 L/m3.
I. CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 13/231,492, filed Sep. 13, 2011, now U.S. Pat. No. 8,210,769, which is a continuation-in-part of U.S. Ser. No. 12/729,683, filed Mar. 23, 2010, now U.S. Pat. No. 8,033,750, which claims priority to Provisional Patent Application No. 61/165,235 filed Mar. 31, 2009, Provisional Patent Application No. 61/169,041 filed Apr. 14, 2009, and Provisional Patent Application No. 61/309,223 filed Mar. 1, 2010, all of which are incorporated herein by reference.

US Referenced Citations (89)
Number Name Date Kind
3640696 Goldmann Feb 1972 A
3651649 Najvar et al. Mar 1972 A
3690107 Dolfing et al. Sep 1972 A
3705467 McKnight Dec 1972 A
3887506 Hewitt Jun 1975 A
3895956 Yoshida et al. Jul 1975 A
4106296 Leonard, Jr. et al. Aug 1978 A
4129435 Takematsu et al. Dec 1978 A
4218234 Nadasy et al. Aug 1980 A
4252556 Nadasy et al. Feb 1981 A
4268428 Green May 1981 A
4417992 Bhattacharyya et al. Nov 1983 A
4592931 Cargle Jun 1986 A
4650820 Decroix Mar 1987 A
4822425 Burch Apr 1989 A
5013349 Tanaka May 1991 A
5082500 Nachtman et al. Jan 1992 A
5112902 Moriya et al. May 1992 A
5178668 Traver et al. Jan 1993 A
5595782 Cole Jan 1997 A
5648116 Roe et al. Jul 1997 A
5712316 Dahmen et al. Jan 1998 A
5733576 Chmelir Mar 1998 A
5824725 Lahalih Oct 1998 A
5846601 Ritter et al. Dec 1998 A
5860770 Hunt Jan 1999 A
5997599 Wommack et al. Dec 1999 A
6060557 Dahmen et al. May 2000 A
6076997 First et al. Jun 2000 A
6132638 Oldenhove Oct 2000 A
6325836 Wommack et al. Dec 2001 B1
6349499 Spittle Feb 2002 B1
6403700 Dahmen et al. Jun 2002 B1
6503521 Atis Jan 2003 B1
6695545 Boston Feb 2004 B2
6729805 Wathen May 2004 B2
6750262 Hahnle et al. Jun 2004 B1
6759453 Jelling et al. Jul 2004 B2
6982291 Desin Jan 2006 B2
7001444 Small Feb 2006 B2
7026390 O'Brien-Bernini et al. Apr 2006 B2
7070709 Schilling et al. Jul 2006 B2
7074266 Hawkins et al. Jul 2006 B2
7134806 Lazic Nov 2006 B2
7207744 Jones, IV et al. Apr 2007 B2
7285515 Goncalves et al. Oct 2007 B2
7514018 Schilling et al. Apr 2009 B2
7651294 Maier Jan 2010 B2
8033750 Vitale et al. Oct 2011 B2
8048333 Vitale et al. Nov 2011 B2
8066448 Vitale et al. Nov 2011 B2
8070383 Vitale et al. Dec 2011 B2
8070384 Vitale et al. Dec 2011 B1
8070979 Vitale et al. Dec 2011 B2
8070980 Vitale et al. Dec 2011 B2
8104991 Vitale et al. Jan 2012 B2
8132982 Vitale et al. Mar 2012 B2
20040011102 Sears Jan 2004 A1
20040035162 Williams et al. Feb 2004 A1
20040074271 Krysiak et al. Apr 2004 A1
20040234682 Hawkins et al. Nov 2004 A1
20040245494 Horman et al. Dec 2004 A1
20040260017 Mertens et al. Dec 2004 A1
20050090401 Sakane et al. Apr 2005 A1
20050124527 Hawkins et al. Jun 2005 A1
20050150417 Hirsbrunner et al. Jul 2005 A1
20060020058 Grawe et al. Jan 2006 A1
20060048670 Al-Rashed Mar 2006 A1
20060075928 Richards et al. Apr 2006 A1
20060128839 Ferrall et al. Jun 2006 A1
20060156961 Langford Jul 2006 A1
20070037925 Weitzel et al. Feb 2007 A1
20070135561 Rath et al. Jun 2007 A1
20070286903 Becicka Dec 2007 A1
20080028890 Hey et al. Feb 2008 A1
20080038470 Hagens et al. Feb 2008 A1
20080087305 Cotter Apr 2008 A1
20080185160 Diener et al. Aug 2008 A1
20090090890 Nguyen Apr 2009 A1
20090169901 Blacklidge Jul 2009 A1
20090189113 Lamperd et al. Jul 2009 A1
20090211491 Ogata et al. Aug 2009 A1
20090301302 Weatherman et al. Dec 2009 A1
20090301863 Swanson, Jr. et al. Dec 2009 A1
20090318602 Deneuvillers Dec 2009 A1
20100047015 Takamura et al. Feb 2010 A1
20100075029 Wilson, Jr. Mar 2010 A1
20100112329 Yi May 2010 A1
20120207551 Guilbault et al. Aug 2012 A1
Foreign Referenced Citations (19)
Number Date Country
0 467 073 Jan 1992 EP
1 112 324 Oct 2005 EP
2 083 121 Jul 2009 EP
2 142 552 Jan 1985 GB
49 7899 Feb 1974 JP
04 142390 May 1992 JP
07 042210 May 1995 JP
2109781 Nov 1996 JP
10 2000 0060661 Oct 2000 KR
00 15715 Mar 2000 WO
02 02715 Jan 2002 WO
2006 041581 Apr 2006 WO
2006 063159 Jun 2006 WO
2006 068467 Jun 2006 WO
2007 0146317 Dec 2007 WO
2008 011368 Jan 2008 WO
2008 070234 Jun 2008 WO
2009 137299 Nov 2009 WO
2010 025518 Mar 2010 WO
Non-Patent Literature Citations (26)
Entry
ROHMAX Additives GmbH, “Viscoplex 1-180,” Data Sheet, Jul. 2004, www.rohmax.com.
ROHMAX Additives GmbH, “Viscoplex 10-131,” Data Sheet, Jul. 2004, www.rohmax.com.
Midwest Industrial Supply, Inc., “Envirokleen Gravel Runways Fines Preservation,” unknown publication, unknown date, www.midwestind.com.
Midwest Industrial Supply, Inc. “EK35 Gravel Runways Fines Preservation,” unknown publication, unknown date, www.midwestind.com.
Geotechnical Laboratory of Advanced Geotechnical Testing AGT, LLC, “Kipnik Soil Evaluation Stabilized Sub-Grade Apron Development,” AGT Project No. 3407159, Sep. 2007.
University of Alaska Fairbanks, Hazirbaba, Connor, Davis, Zhang, “Final Report: The Use of Geofiber and Synthetic Fluid for Stabilizing Marginal Soils,” INE Project No. RR07.03, Oct. 1, 2007.
Tracey, Tsou, “Dynamically Vulcanized Alloy Innerliners,” Rubber World Magazine, ISSN 0035-9572, Sep. 1, 2007.
University of Alaska Fairbanks, Misc. Authors, Newsletter vol. 1, No. 2, Feb. 2008.
Wacker Silicones, “Drysoil in Landscaping Application, Creating Tomorrow's Solutions,” Apr. 1, 2008.
Copeland, Eisele, Chesney, Kawatra, “Factors Influencing Dust Suppressant Effectiveness,” Minerals & Metallurgical Processing, 25(4): 215-222, Nov. 2008.
Kavouras, Etyemezian, Nikolich, Gilles, Sweeney, Young, Shafer, “A New Technique for Characterizing the Efficacy of Fugitive Dust Suppressants,” Journal of the Air & Waste Management Association, 59 (5): 603-612, May 2009.
Edvardsson, “Gravel Roads and Dust Suppression,” Road Materials and Pavement Design, 10(3): 439-469, Jul.-Sep. 2009.
Goodrich, Koski, Jacobi, “Monitoring Surface Water Chemistry Near Magnesium Chloride Dust Suppressant Treated Roads in Colorado,” Journal of Environmental Quality, 38(6): 2373-2381, Nov.-Dec. 2009.
Marais, Thompson, Visser, “Managing Mine Road Maintenance Interventions Using Mine Truck On-Board Data,” The Southern African Institute of Mining and Metallurgy, Surface Mining 2008.
Thompson, Visser, “Mine Haul Road Maintenance Management Systems,” unknown publication, unknown date.
Thompson, Visser, Van Den Bert, Bosch, “Towards a Mechanistic Structural Design Method for Surface Mine Haul Roads,” Journal of the South African Institution of Civil Engineers, vol. 38, No. 2, Second Quarter 1996, pp. 13-21.
Thompson, Visser, “Mine Haul Road Fugitive Dust Emission and Exposure Characterisation,” unknown publication, Jan. 2001.
Thompson, Visser, “Benchmarking and Managing Surface Mine Haul Road Fugitive Dust Emissions,” unknown publication, Mar. 2002.
Hugo, Heyns, Thompson, Visser, “Haul Road Condition Monitoring using Vehicle Response Measurements,” ICSV, Jul. 2005.
Thompson, Visser, “The Impact of Rolling Resistance on Fuel, Speed and Costs,” HME 2006: Continuous Improvement Case Studies, 2006.
Thompson, Visser, “Selection and Maintenance of Mine Haul Road Wearing Course Materials,” Mining Technology, 2006, vol. 115, No. 4, pp. 140-153.
Thompson, Visser, “Selection Performance and Economic Evaluation of Dust Palliatives on Surface Mine Haul Roads,” The Journal of the Southern African Institute of Mining and Metallurgy, vol. 107, Jul. 2007, pp. 1-16.
Thompson, Visser, “Final Project Report COL467: The Reduction of the Safety and Health Risk Associated with the Generation of Dust on Strip Coal Mine Haul Roads,” University Pretoria, Departments of Mining and Civil Engineering, Jan. 2000.
Edil, Benson, “Sustainable Construction Case History: Fly Ash Stabilization of Road-Surface Gravel,” University of Wisconsin-Madison, Geological Engineering Program, Dept. of Civil and Environmental Engineering, 2007 World of Coal Ash (WOCA), May 7-10, 2007.
Liu, J., Shi,B.,Jiang, H., Bae, S., Huang, H., “Improvement of Water-Stability of Clay Aggregates Admixed with Aqueous Polymer Soil Stabilizers” Catena, vol. 77, Issue 3, Jun. 15, 2009, p. 175-179.
Collins, R.W., “Stabilization of Marginal Soils using GeoFibers and NonTraditional Additives” Thesis presented to Faculty of University of Alaska Fairbanks, Fairbanks, Alaska, Aug. 2011, 109 Pages.
Related Publications (1)
Number Date Country
20120275862 A1 Nov 2012 US
Continuations (1)
Number Date Country
Parent 13231492 Sep 2011 US
Child 13538076 US