Foamed composition for pavement patching, and methods of utilizing and producing the same
A low density annular grout composition for filling voids. The composition may consist of cementitious fly ash, water, set retarder and cellular foam. The composition may have a compressive strength of between 100 and 600 psi at seven days and less than 1500 psi at 28 days. The composition may have a density between 20 and 75 pcf. Also disclosed is a method of filling a void with a low density annular grout composition. The method can include determining the time necessary to fill the void, adding water and set retarder to a cementitious fly ash to make a wet mixture, adding air to the wet mixture, and adding the composition to the void.
1. A composition for patching pavement consisting essentially of:
between 5% and 20% air by volume;
between 65% and 90% Class C fly ash by weight; and
between 16% and 30% water by weight;
the composition having a time to set of less than 40 minutes, a compressive strength of between 150 and 450 PSI in one hour, and a compressive strength of between 600 and 1800 PSI in four hours.
2. The composition of claim 1 , wherein the air is between 5% and 10% by volume of the composition.
3. The composition of claim 1 , wherein the Class C fly ash is between 70% and 85% by weight of the composition.
4. The composition of claim 1 , wherein the water is between 16% and 23% by weight of the composition.
5. The composition of claim 1 , wherein the water is between 23% and 30% by weight of the composition.
6. The composition of claim 1 , wherein the set time is less than 20 minutes.
7. The composition of claim 1 , wherein the set time is less than 15 minutes.
8. The composition of claim 1 , wherein the removability modulus is less than 1.5 after 28 days.
9. The composition of claim 1 , wherein
the air is between 10% and 15% by volume;
the Class C fly ash is between 74% and 80% by weight; and
the water is between 20% and 26% by weight.
10. The composition of claim 1 or 9 , wherein the volume of air results from an air entraining agent.
11. The composition of claim 10 , wherein the air entraining agent is a cellular foam.
12. A composition for patching pavement consisting essentially of:
between 5% and 20% air by volume;
between 65% and 90% of Class C fly ash by weight;
between 16% and 30% water by weight;
between 0.1% and 0.5% set retarder by weight;
the composition having a time to set of less than 40 minutes, a compressive strength of between 150 and 450 PSI in one hour, and a compressive strength of between 600 and 1800 PSI in four hours.
13. A pavement patch consisting essentially of:
between 5% and 20% air by volume;
between 65% and 90% Class C fly ash by weight; and
between 16% and 30% water by weight;
the pavement patch having a compressive strength of between 150 and 450 PSI in one hour, and a compressive strength of between 600 and 1800 PSI in four hours; and
the pavement patch having an aggregate on its surface.
14. The pavement patch of claim 13 , wherein the aggregate is between 1 and 2 pounds per square yard of the surface of the pavement patch.
15. A composition for patching pavement consisting essentially of:
between 5% and 10% air by volume;
between 20% and 50% Class C fly ash by weight;
between 40% and 70% filler by weight;
between 10% and 15% water by weight;
the composition having a set time of less than 40 minutes, a compressive strength of between 150 and 450 PSI in one hour, and a compressive strength of between 600 and 1800 PSI in four hours.
16. The composition of claim 15 , wherein the filler is sand.