PREPARATION OF R.C.C

PREPARATION OF R.C.C

 REINFORCED CONCRETE CEMENT

•  CEMENT
• AGGREGATE
• STEEL
• WATER

CEMENT

        Cement is used as the binding material and acts as a binder for coarse and fine aggregates. Generally ordinary partland, CEMENT is used to form concrete. Initial setting time of good cement should not be less than 30 minutes and final setting time should not exceed 10 hours.

 AGGREGATE

               The granular material generally inert chemical such as natural sand, gravels, cushed stones and air cooled iron blast furnace slag are called aggregates. If only CEMENT is used for the construction, the concrete will result in shrinkage and ultimately cracks are develop. So as to avoid these cracks, aggregates are used. These aggregates are bond together by means of cement. The aggregates are classified into two categories such as final and coarse aggregates. The material which is passed through sieve no 480 is called fine aggregates and which retained on sieve no 480 is called coarse aggregates. These aggregates should be clean. sharp, angular, well graded, hard, durable and free from foreign matters.

STEEL

           The Steel reinforcement is generally in the form of round bars of mild steel. The diameters of bars vary from 5 mm to 40 mm. Sometimes the square bars or twisted bars or ribbed-bars or ribbed-tor steel are used as steel reinforcement.
        Following are the reason as to why mild steel has been adopted as reinforcing material
         These is proper band between CEMENT concrete and mild steel. Hence, it enables concrete to transmit its stresses to steel.
        The coefficient of linear expansion of steel is almost the same as that of concrete. Hence o internal stressed are set up within reinforced concrete members due to to rise or fall in temperature.
        Deformed or twisted bars which are made of mild steel have considerably high yield stress, tensile strength and bond strength.

 Water 

           The water to be used in making concrete should confirm to the drinking water standard. It is leas expensive but most important ingredient of concrete. The water, which is used for making  concrete should be free from acids, alkalies, salts, oil, grease and decayed vegetable matters. The amount of water should be of that, which will produced concrete of required quality.

• PROPERTIES OF R.C.C

•  USES OF R.C.C

PROPERTIES OF R.C.C
 USES OF R.C.C