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Study Of Effect Of Water Reducing Admixture On Slump, Air Content And Compressive Strength

Abstract:

Concrete is the homogeneous mixture of cement, coarse aggregates, fine aggregates, and water. Cement acts as binding material which binds coarse aggregates (ballast), fine aggregates (sand) after reacting with water and set out in a rigid mass. Coarse aggregate provide the strength to concrete. Fine aggregates fill the remaining pores (voids) so that we can get a solid homogeneous mass after setting and hardening of the paste. Different grades of concrete are used for different purpose based on loading and Environmental condition. If the loading is increases, the grade of concrete needs to increase. Different type of admixtures is also added during the mixing time in order to modify the certain properties of concrete that required under some circumstances. The choice and dosage of admixture depends upon our specific requirement that suited in local environmental and loading condition where we are going to use concrete. The admixture which causes early setting and hardening of concrete are called accelerators.

The used admixture which prolongs the setting and hardening time is called de-accelerator. The present study are aimed at to study the impact of water reducer admixture and its dosage on slump, air content and compressive strength provided the water cement ratio is constant. In order to check out the reliability of data, replicative test is also carried out. Study is also carried out for selection of optimum time period for testing of said properties of concrete. Meanwhile designing of concrete is also carried out. It is seen that compressive strength is increases and slump value is decreases as a result of addition of admixture due to decrease of water content. Time schedule of 7 days and 28 days is suitable for checking of quality parameter.

Introduction:

Before going to particular topic let’s take some discussion on concrete. Characteristic compressive Strength is defined as the strength of concrete below which not more than 5% of the test results are expected to fall. There is normally a gain of strength beyond 28 days. The quantum of increase depend upon the grade and type of cement, curing and environmental condition. The strength of concrete after one year as compared to 28 days strength is about 20 -25 % only. That means time factor is more and strength gain is very less. So, it’s better to choose the time factor of 7 days and 28 days for strength testing in order to check about the quality of concrete. We generally classify three types of grades of concrete

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