US Patent 11434169 High-strength flowable fill compositions

High-strength flowable fill compositions are disclosed. The compositions include cement, aggregate (e.g. sand), water, coloring agent, polymer, and fibers. In an embodiment, the compositions include an accelerant, e.g., calcium chloride or sodium bicarbonate and/or an air entraining agent. In an embodiment, the compositions include a water-proofing agent to eliminate efflorescence. The compositions have a compressive strength of between 300 psi and 3000 psi after 1 day, a compressive strength of between 900 psi and 4000 psi after 7 days, and a compressive strength of between 1200 psi and 5000 psi after 28 days.