Concrete making materials Cement Aggregate and Water

Content of this article: Concrete making materials Cement: Ordinary portland cement, Rapid hardening Portland cement, Low heat Portland  cement,  Portland slag cement, Sulfate resisting cement, Portland pozzolana cement, white cement, Aggregate and Water Concrete Making Materials (1)       Cement Cement is the only chemically active ingredient of concrete which shows binding properties after reacting with water. It consist of silicates and aluminates of calcium which form a hardened mass after mixing with water. This type of cement is also known as hydraulic cement. There are many types of cements available in market, some of which are explained below : (i)        Ordinary Portland Cement Ordinary portland cement (OPC) is commonly used in construction. The Bureau of Indian Standard has classified OPC in three grades. This classification is based on the compressive strength of cement-sand mortar cubes. The face area of these cubes shall be 50 cm2. The cube is made of 1…

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Requirements of good concrete mix and Grades of concrete

Content of this Article: Concrete, Requirements of good concrete mix, Grades of concrete, The characteristic compressive strength of concrete R.C.C. consists of concrete and reinforcing material. The strength of an R.C.C. section depends upon the kind of concrete and reinforcement used.   Concrete The properties of concrete depends upon the proportions and type of its ingredients. A properly designed concrete mix is very durable. Requirements of good concrete mix (i)        The concrete should be mixed thoroughly to from a homogeneous mix. (ii)       Concrete should be compacted properly to prevent it from being porous. (iii)     Sufficient curing of concrete is required for developing full strength. (iv)      The water cement ratio should be appropriate, considering the strength and workability criteria. (v)       The concrete mix should be designed properly and should have all the ingredients in right proportions. (vi)      The water used for mixing should be free from all harmful organic substances.…

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