The most common building material, made by mixing cement, sand, gravel, and water, which hardens into a stone-like solid.
Concrete is a construction material composed of cement, aggregates (sand and gravel), water, and often chemical admixtures, that hardens through cement hydration into a strong, durable material. It is the most widely used construction material in the world due to its versatility, strength, and economy. Concrete can be cast into virtually any shape and is used for foundations, slabs, walls, and structural frames.
Concrete is usually one of the largest single line items on a structural bid, so small unit-price errors compound quickly across hundreds of cubic yards. Estimators must price by mix design (strength, admixtures, aggregate), placement method, and waste factor, and coordinate the concrete sub's pour schedule against weather and curing windows that directly affect the project timeline and cash flow.
An estimator takes off 850 cubic yards of 4,000 psi concrete for a slab-on-grade, adds a 5 percent waste factor, and prices it per cubic yard delivered plus separate line items for pumping, finishing, and reinforcement before rolling it into the foundation scope.
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