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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site concrete Pouring concrete to make a patio floor A versatile structural building material, made by mixing cement, aggregate, and water. Initially moldable, the cement hardens through a series of complex chemical reactions, forming a matrix which binds the aggregate. Various other ingredients – admixtures – may be added to improve the properties of the concrete; air-entraining agents increase durability. Since concrete is much more able to resist compressive rather than tensile stress, it is often reinforced with steel bars embedded in it which are able to bear the tension. Prestressed concrete is reinforced concrete in which the steel is under tension and the concrete is compressed; it can with stand very much greater stresses. Concrete is used for all building elements and for bridges, dams, canals, highways, etc., often as precast units. Related categories    • BUILDING AND ARCHITECTURE Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP