PERFORMANCE OF BLENDED CONCRETE ON BOILING WATER METHOD AND PREDICTION OF ITS COMPRESSIVE STRENGTH

Abstract

As it is well known Fly ash is a waste generated by thermal power plants. And it is a big environmental problem. In modern decades, there are various different techniques like industrialization and urbanization are two process that are being done at a large scale in all over the world. So, to consume these materials efficiently in a cost affective way cement of concrete mix is being replaced partially to reduce the amount of cement and also to utilize these waste. Also the fly ash is cost effective a reasonable amount of money can be saved in big projects like housing societies for poor people made by government . So, M30 mix with 0% , 10% ,20% and 30 % replacement of fly ash with cement is done to see the variation of strength in the concrete .similar work for GGBS replacement is done.

As we know that the goodness of concrete in construction works i.e. the quality of concrete is calculated as its 28 days compressive strength, and the procedure for measuring it 28 days strength requires 28 days of wet curing to gain significance strength before testing, but this process is too long of a period to be of any value. As we know that neither concrete construction control nor applying timely corrective measures are possible. Suppose If 28 days strength and the quality of concrete is not up to the mark then it would be very hard to remove that considerably hardened concrete and also a lot of concrete had been buried in by the subsequent construction of the structure. So the replacement of this concrete becomes very difficult and practically not possible. Also one other problem is, suppose the concrete mix possess excessive strength than required, then it will be wasteful use of cement on uneconomical concrete mix . Hence, the 28 days concrete testing of cubes is not a good quality control test. So to get quality control and in most cases early compressive strength accelerated curing of the concrete is done. Here we have done accelerated curing by boiling water method as prescribed by IS 9013 (1978).

Durability of concrete is now a days very hot topic for research . various test are being conducted by different concrete institute . Till now their no special code for durability tests in India , American codes are being followed. Acid attack test will be conducted on these different concrete mixes and the variation in weight of concrete and strength of concrete will be noted at intervals of 30, 60 , 90 and 120 days.