Disadvantages Of Cement

We define concrete as a composite material which composed of coarse aggregate bonded together with fluid cement. The form of concrete is a mixture of paste and aggregates, or rocks. Cement is one of the important compositions of concrete. To produce concrete, we mix the cement with water and aggregates. After mixing, the water reacts with cement first then bonds the aggregates together and creates a robust stone-like material. Itbecomes a semi-liquid that we can shape, we can pour it into a certain form and it will solidify and hardenthough few hours. The chemical process of concrete solidifying and hardening is called hydration. The proportioning and mixing of the ingredients play an essential role to produce a strong and durable concrete. It is because these ingredients may accelerate or slow down the rate of concrete hardening and affect the tensile strength entrainment of air and water resistance of concrete.Typically, we mix about 10% to 15% of cement, 60% to 75% of aggregate and 15% to 20% of water to produce concrete. In concrete mixes,entrained air may take up another 5% to 8%. Besides that, concrete is a material which can be formulated with high compressive strength but significantly low tensile strength. At lower stress levels, concrete is relatively constant but it starts to decrease at higher stress levels.The coefficient of thermal expansion of concrete is very low and all concrete structures will fail to some extent, due to shrinkage and tension.Hence, we