Claims
- 1. A process for paving a sub-base surface with compactable asphaltic concrete including aggregates and an asphaltic cement to provide a finished asphaltic pavement having dormant zones of potential fracture at predetermined locations, the process for paving comprising the steps of:
- a) forming on said sub-base surface a continuous longitudinally extending mat of compactable asphaltic paving concrete of predetermined thickness, the mat having a longitudinal direction and opposite, longitudinally extending edges and including asphaltic cement and aggregates;
- b) displacing said asphaltic cement and said aggregates in said mat before compacting to create a plurality of temporary open score lines transverse to said longitudinal direction at longitudinally spaced intervals, said open score lines extending generally in a direction from one of said longitudinally extending edges to the other of said longitudinally extending edges; and
- c) compacting said mat of compactable asphaltic concrete to close and seal said open score lines and to provide a finished asphaltic pavement of predetermined density having a smooth uninterrupted traffic bearing top surface wherein said closed sealed score lines define a plurality of dormant zones of potential fracture substantially concealed at said longitudinally spaced intervals, said dormant zones of potential fracture extending generally transverse to said longitudinal direction in a direction from one of said longitudinally extending edges to the other of said longitudinally extending edges.
- 2. A process according to claim 1 wherein said aggregates include larger and smaller aggregate size fractions forming aggregate interlocks in said mat and wherein;
- step b) further comprises the step of displacing all of said aggregates to interrupt all of said aggregate interlocks along said score lines in at least the top one third of said mat thickness at said longitudinally spaced intervals; and
- step c) further comprises the step of compacting said mat to reestablish said aggregate interlocks between said smaller aggregate size fractions to create a region in said mat wherein there is minimal aggregate interlock of said larger aggregate size fractions thereby creating said dormant zone of potential fracture.
- 3. The process according to claim 1 wherein
- step b) further includes at least partially penetrating said mat thickness by a scoring tool to displace said aggregates and create opposed facing side walls defining said score in said mat at said longitudinally spaced intervals; and
- step c) further includes compacting said scored mat to close said temporary open score lanes and bond said opposed facing side walls together in sealed relation to provide at a plurality of sealed substantially concealed dormant zones of potential fracture in said finished pavement that are impervious to liquid unless fractured.
- 4. The process according to claim 3 wherein step b) further comprises causing said scoring tool to penetrate into said mat a distance equal to one third of the total thickness of said mat.
- 5. The process according to claim 3 wherein step b) further comprises moving said scoring tool to cause said aggregates to be displaced horizontally from said score line into said opposed facing side walls as said score line is being created.
- 6. The process according to claim 3 wherein:
- step a) further comprises forming said mat of compactable asphaltic paving concrete as an unbroken mat of pavement; and
- step b) further includes creating said temporary score lines by moving said scoring tool transversely of said pavement mat at said longitudinally spaced intervals to establish said dormant zones of potential fracture.
- 7. The process according to claim 1 wherein step b) further comprises spacing said score lines at longitudinally spaced intervals in the range of 0.3 to 15 feet.
- 8. A process for paving a sub-base surface with compactable asphaltic concrete comprising aggregates forming aggregate interlocks, and an asphaltic cement to provide a finished longitudinally extending asphaltic pavement having dormant zones of potential fracture at predetermined longitudinally spaced locations, the process comprising the steps of:
- a) forming on said sub-base surface a continuous longitudinally extending mat of compactable asphaltic paving concrete of predetermined thickness, the mat having a longitudinal direction and opposite, longitudinally extending edges and comprising asphaltic cement and larger and smaller aggregate size fractions;
- b) displacing said asphaltic cement and said aggregates to create a plurality of temporary open score lines in said mat before compacting and to interrupt all of said aggregate interlocks along said score lines in at least the top one third of said mat thickness at said predetermined longitudinally spaced locations, said open score lines being transverse to said longitudinal direction at said longitudinally spaced locations, and said score lines extending generally in a direction from one of said longitudinally extending edges to the other of said longitudinally extending edges; and
- c) compacting said mat of compactable asphaltic concrete to reestablish said aggregate interlocks between said smaller aggregate size fractions and to close and seal said open score lines and provide a finished asphaltic pavement of predetermined density having a smooth uninterrupted traffic bearing top surface wherein said closed sealed score lines define a plurality of dormant zones of potential fracture substantially concealed at said longitudinally spaced locations.
- 9. The process according to claim 8 wherein
- step b) further includes at least partially penetrating said mat thickness by a scoring tool to displace said aggregate and create opposed facing sidewalls defining said score lines in said mat at said longitudinally spaced locations; and
- step c) further includes compacting said scored mat to close said temporary open score lines and bond said opposed facing sidewalls together in sealed relation to provide at least one sealed substantially concealed dormant zone of potential fracture in said finished pavement that is impervious to liquid unless fractured.
- 10. The process according to claim 9 wherein step b) further comprises causing said scoring tool to penetrate into said mat a distance equal to one third of the total thickness of said mat.
- 11. The process according to claim 9 wherein step b) further comprises moving said scoring tool to cause said aggregates to be displaced horizontally from said score line into said opposed facing side walls as said score line is being created.
- 12. The process according to claim 9 wherein:
- step a) further comprises forming said mat of compactable asphaltic paving concrete as an unbroken mat of pavement; and
- step b) further includes creating said temporary score lines by moving said scoring tool transversely of said pavement mat at said longitudinally spaced locations to establish said dormant zones of potential fracture.
- 13. The process according to claim 8 wherein step b) further comprises spacing said score lines at longitudinally spaced intervals in the range of 0.3 to 15 feet.
- 14. A process for paving a sub-base surface with compactable asphaltic concrete comprising aggregates forming aggregate interlocks, and an asphaltic cement to provide a finished asphaltic pavement having dormant zones of potential fracture at predetermined locations, the process comprising the steps of:
- a) forming on said sub-base surface a continuous longitudinally extending mat of compactable asphaltic paving concrete of predetermined thickness, the mat having a longitudinal direction and opposite, longitudinally extending edges and comprising asphaltic cement and aggregates;
- b) displacing said asphaltic cement and said aggregates in said mat by a scoring tool before compacting to create a plurality of temporary open score lines having opposed facing sidewalls and being transverse to said longitudinal direction at longitudinally spaced intervals, said open score lines extending in a direction from one of said longitudinally extending edges to the other of said opposite longitudinally extending edges; and
- c) compacting said mat of compactable asphaltic concrete to close and seal said open score lines and bond said facing sidewalls together to provide a finished asphaltic pavement of predetermined density having a smooth uninterrupted traffic bearing top surface wherein said closed sealed score lines define a plurality of dormant zones of potential fracture that are substantially concealed at said longitudinally spaced intervals and that are impervious to liquid unless fractured, said dormant zones of potential fracture extending generally transverse to said longitudinal direction in a direction from one of said longitudinally extending edges to the other of said longitudinally extending edges.
- 15. A process according to claim 14 wherein said aggregates include larger and smaller aggregate size fractions forming aggregate interlocks in said mat and wherein;
- step b) further comprises the step of displacing all of said aggregates to interrupt all of said aggregate interlocks along said score lines in at least the top one third of said mat thickness at said longitudinally spaced intervals; and
- step c) further comprises the step of compacting said mat to reestablish said aggregate interlocks between said smaller aggregate size fractions to create a region in said mat wherein there is minimal aggregate interlock of said larger aggregate size fractions thereby creating said dormant zone of potential fracture.
- 16. The process according to claim 14 wherein step b) further comprises causing said scoring tool to penetrate into said mat a distance equal to one third of the total thickness of said mat.
- 17. The process according to claim 14 wherein step b) further comprises moving said scoring tool to cause said aggregates to be displaced horizontally from said score line into said opposed facing sidewalls as said score line is being created.
- 18. The process according to claim 14 wherein:
- step a) further comprises forming said mat of compactable asphaltic paving concrete as an unbroken mat of pavement; and
- step b) further includes creating said temporary score lines by moving said scoring tool transversely of said pavement mat at said longitudinally spaced intervals to establish said dormant zones of potential fracture.
- 19. The process according to claim 14 wherein step b) further comprises spacing said score lines at longitudinally spaced intervals in the range of 0.3 to 15 feet.
Parent Case Info
This application is a continuation of Ser. No. 07/980,359, filed on Nov. 23, 1992 which is now abandoned.
US Referenced Citations (22)
Foreign Referenced Citations (2)
Number |
Date |
Country |
653323 |
Mar 1979 |
SUX |
111080 |
Apr 1917 |
GBX |
Non-Patent Literature Citations (3)
Entry |
Frank Raczon--"Sawcut and seal may prevent reflective cracks"; Mar. 1989, Roads & Bridges, pp. 49-51. |
Al France--"Asphalt rubber tested in Caltrans I-80 project"; Mar. 1989, Roads & Bridges, p. 51. |
Richardson, Clifford--The Modern Asphalt Pavement, 1910, p. 490. |
Continuations (1)
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Number |
Date |
Country |
Parent |
980359 |
Nov 1992 |
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