Patent ID: 8636941

Claim:
A method comprising: placing a first layer of insulating material horizontally on the ground; placing plastic concrete cementitious-based material for a slab on grade on the first layer of insulating material; wherein the cementitious-based material comprises: aggregate; cementitious material, wherein the cementitious material consists essentially of approximately 30% to approximately 80% by weight portland cement, approximately 0% to approximately 50% by weight slag cement, and 20% to approximately 50% by weight fly ash; and water sufficient to hydrate the cementitious-based material; forming the plastic cementitious-based material into a desired shape having a top and sides; placing a second layer of insulating material on the top of the plastic cementitious-based material; leaving the first and second layers of insulating material in place until the cementitious-based material is at least partially cured; and removing the second layer of insulating material.