Concrete

Extreme temperatures make it difficult for the hydration process to take place. When it is too close to freezing, the hydration slows to a standstill and the concrete will not cure and gain strength. Typically the ground should be at least 50 degrees and rising. On the other extreme, when it is very hot, too [...]

Concrete is a mixture of Portland cement, a fine aggregate (sand), a course aggregate (gravel), water and several chemical additives. The water causes the hardening of concrete through a process called hydration which binds the whole mixture together. In its finished state, concrete appears to be a solid slab, but is actually quite porous. As the excess [...]