Question

Помогите пожалуйста. Заранее спасибо

Answer 1

Building materials are naturally wood,stone, and sand.
Строительными материалами, естественно, являются дерево, камень и песок.
Properties of concrete
Concrete has relatively high compressive strength, but significantly lower tensile strength, and as such is usually reinforced with materials that are strong in tension (often steel). The elasticity of concrete is relatively constant at low stress levels but starts decreasing at higher stress levels as matrix cracking develops. Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep.