Foamed compositions for reducing freeze-thaw heave risk, and methods of utilizing and producing the same
A composition and method for reducing freeze-thaw heave risk over flash-filled voids are disclosed. A composition can include cementitious fly ash, water and cellular foam. The composition can optionally include a filler, e.g., Type F fly ash, or additional desired components. A method can include mixing the desired composition and applying the composition to a void. The method can optionally include determining the desired composition based on various factors.
1. A composition for preventing ice lens formation consisting essentially of:
between 5% and 75% air by volume;
between 20% and 90% class C fly ash by weight; and
between 15% and 60% water by weight;
wherein the composition has a time to set of less than 40 minutes, a compressive strength of between 10 and 100 PSI after 4 hours, and a removability modulus of less than 1.8 after 28 days.
2. The composition of claim 1 , wherein the air is between 30% and 70% by volume of the composition.
3. The composition of claim 1 , wherein the class C fly ash is between 30% and 80% by weight of the composition.
4. The composition of claim 1 , wherein the water is between 20% and 40% by weight of the composition.
5. The composition of claim 1 , wherein the water is between 25% and 35% by weight of the composition.
6. The composition of claim 1 , wherein the set time is less than 30 minutes.
7. The composition of claim 1 , wherein the set time is less than 20 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 removability modulus is less than 0.8 after 28 days.
10. The composition of claim 1 , wherein
the air is between 30% and 70% by volume;
the class C fly ash is between 30% and 80% by weight; and
the water is between 20% and 40% by weight.
11. The composition of claim 1 or 10 , wherein the water to class C fly ash ratio is between 0.35 to 0.50.
12. The composition of claim 1 or 10 , wherein the volume of air results from an air entraining agent.
13. The composition of claim 12 , wherein the air entraining agent is a cellular foam.
14. A composition for preventing ice lens formation consisting essentially of:
between 10% and 60% air by volume;
between 10% and 60% of class C fly ash by weight;
between 15% and 75% of class F fly ash by weight; and
between 20% and 60% water by weight;
wherein the composition has a time to set of less than 40 minutes, a compressive strength of between 10 and 100 PSI after 4 hours, and a removability modulus of less than 1.8 after 28 days.
15. The composition of claim 14 , wherein
the air is between 15% and 50% by volume;
the class C fly ash is between 15% and 50% by weight;
the class F fly ash is between 30% and 65% by weight; and
the water is between 25% and 40% by weight.
16. The composition of claim 14 , wherein
the air is between 20% and 40% by volume;
the class C fly ash is between 15% and 40% by weight;
the class F fly ash is between 30% and 55% by weight; and
the water is between 25% and 35% by weight.
17. The composition of claim 14 , wherein
the air is between 20% and 60% by volume;
the class C fly ash is between 30% and 60% by weight;
the class F fly ash is between 15% and 40% by weight; and
the water is between 25% and 50% by weight.
18. The composition of claim 14 , wherein
the air is between 30% and 60% by volume;
the class C fly ash is between 35% and 55% by weight;
the class F fly ash is between 15% and 35% by weight; and
the water is between 25% and 40% by weight.
19. The composition of claim 14 , 15 , 16 , 17 , or 18 , wherein the volume of air results from an air entraining agent.
20. The composition of claim 19 , wherein the air entraining agent is a cellular foam.
21. A composition for preventing ice lens formation consisting essentially of:
between 10% and 60% air by volume;
between 10% and 60% of class C fly ash by weight;
between 15% and 75% of class F fly ash by weight;
between 20% and 60% water by weight; and
between 0.01% and 2.0% set retarder by weight;
wherein the composition has a time to set of less than 4 hours, a compressive strength of between 0 and 80 PSI after 4 hours, and a removability modulus of less than 1.5 after 28 days.