Concrete is a composite material, consisting mainly of Portland cement, water and aggregate (gravel, sand or rock) . When these materials are mixed together, they form a workable paste which then gradually hardens over time.22 Oca 2021
Concrete is a composite material, consisting mainly of Portland cement, water and aggregate (gravel, sand or rock) . When these materials are mixed together, they form a workable paste which then gradually hardens over time.22 Oca 2021