Abstract
The present paper would contribute to the efforts being made in the field of concrete technology towards development of concretes possessing good strength and durability properties along with economic and ecological advantage. In the present study it was found that with increase in amount of coal bottom ash, standard consistency, initial and final setting time increase at the same time workability of concrete decreases. Early age strength is less for bottom ash concrete compare to control mix, but as the age increases they show good improvement in strength due to pozzalanic reaction. Optimum dosage is observed to be 10% Grinded Bottom Ash (GBA) which shows about 14 % more strength compared to control mix at 56 days. Also 20% replacement by GBA gives results comparable to control concrete. GBA concrete shows more resistance to acid attack compared to Original Bottom Ash (OBA). Mix M7 with 30 % replacement by GBA shows highest resistance to acid attack. With the increase in amount of bottom ash water absorption capacity of concrete increases, also as the age increases for all the mix water absorption capacity decreases. It was also found that at optimum dosage i.e at 10% replacement of cement with GBA it is also economical and also less amount of CO2 is emitted that mean it is also environmental friendly compared to control mix.
Highlights
Natural resources of aggregate, due to high consumption in construction fields, are getting depleted rapidly
It shows that as the replacement of cement with Bottom ash (BA) increases, the workability of concrete mix decreases compared to control mix. It shows that the addition of Grinded Bottom Ash (GBA) decreases the workability more as compared to Original Bottom Ash (OBA)
It may be due to the fact that GBA is finer than OBA which absorbs more water thereby reducing the workability
Summary
Due to high consumption in construction fields, are getting depleted rapidly. Mechanical properties, such as compressive strengths and modulus of elasticity and flexural strength of high-strength concrete with BA were evaluated. Influence of the use of coal bottom ash (CBA) as a replacement for natural fine aggregates on the properties of concrete in the fresh state is studied by the researcher. Strength and drying shrinkage of concretes with the natural sand replaced with furnace BA by mass were studied at fixed water cement ratios and fixed slump ranges. The results showed that, at fixed water cement ratios, the compressive strength and the drying shrinkage decreases with the increase of the furnace BA sand content. In this paper we tried to study the effect of BA on mechanical and durability properties of concrete, as well as the economical and ecological study were done to know how much cost and CO2 emission is reduced
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