砼是由骨料、水泥石以及存留其中的水分、气体组成的一种非匀质脆性材料。因其取材广、价格低、抗压强度高,易浇注成各种形状、易养护、耐火好、抗风化等优点而被公路、铁路、水利及建筑中广泛应用。但砼最大的缺点是在硬化过程中,在温度、湿度变化的条件下各种材料产生不一致 Concrete is a non-uniform brittle material composed of aggregate, cement stone and the water and gas which remain in it. Because of its wide range of materials, low prices, high compressive strength, easy pouring into a variety of shapes, easy maintenance, good fire resistance, weathering and other advantages of roads, railways, water conservancy and construction widely used. However, the biggest drawback of concrete is the hardening process, under the conditions of temperature and humidity changes in a variety of materials inconsistent