Claims
- 1. A process for preparing high strength, water-resistant aggregate comprising the steps of:
- (a) high intensity mixing metal chlorides with alkaline substance consisting essentially of at least one cementitious material and optionally 0.1-50%, based on the total weight of the alkaline substance, of at least one neutralizing agent selected from the group consisting of lime, fly ash, soda ash, CaCO.sub.3 and mixtures thereof, said high intensity mixing taking place in the presence of a low water ratio of less than 0.6 pounds of total water per pound of alkaline substance, at about 1 to about 50 meter/second within about 1 second to about 15 minutes, wherein the metal chlorides are simultaneously neutralized, stabilized and solidification of the mixture is initiated; and
- (b) curing the product resulting from step (a) wherein a compressive strength of greater than 1740 psig is achieved.
- 2. The process of claim 1 wherein step (b) is preceded by consolidating the product resulting from step (a).
- 3. The process of claim 2 wherein the high intensity mixing takes place from about 8 to 30 meter/second within 1 second to about 5 minutes.
- 4. The process of claim 1 wherein the high intensity mixing takes place with a bulk shear rate in excess of 10 sec.sup.-1.
- 5. The process of claim 1, claim 2, claim 3 or claim 4 wherein the cementitious material is selected from the group consisting of hydraulic cement, blast furnace slag, lime-containing fly ash and mixtures thereof.
- 6. The process of claim 5 wherein the hydraulic cement is portland cement.
- 7. The process of claim 2 wherein the alkaline material is hydraulic cement, the water ratio is about 0.5 and the high intensity mixing is about 26 meter/second measured by tip speed and the residence time of the mixing is about 5 to about 20 seconds.
CROSS-REFERENCE TO EARLIER FILED APPLICATION
This application is a continuation-in-part of application Ser. No. 08/242,920, filed May 16, 1994, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4116705 |
Chappell |
Sep 1978 |
|
4375986 |
Pichat |
Mar 1983 |
|
5076850 |
Eschborn II et al. |
Dec 1991 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
367914-A |
May 1990 |
EPX |
369946-B1 |
Apr 1993 |
EPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
242920 |
Sep 1994 |
|