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Performance of Coal Washery Reject and Fly Ash Blended Concrete in Acidic Environment

Author(s):

J. Sudharshan , Annamacharya institute of technology & sciences, Andhra Pradesh, India ; R. Rajesh Kumar, Annamacharya institute of technology & sciences, Andhra Pradesh, India

Keywords:

Concrete, Coal Washery Rejects, Ultrasonic Pulse Velocity, Fly Ash, Compressive Strength, Mass, Acid Attack

Abstract

Disposal of waste material has been a great problem and it becomes difficult to find natural resources due to their excessive exploitation. Use of waste materials as construction materials has numerous benefits such as reduction in cost, saving in energy, and protection of environment. Many investigations have been done on Fly Ash (FA) and Coal Washery Reject (CWR). The utility of FA as a partial replacement of cement in concrete mixes has become a traditional practice. CWR is a waste material disposed from Thermal power plants and it can be a substitute for coarse aggregate. The present investigation is mainly aimed to study the variation in compressive strength, weight and ultrasonic pulse velocity (UPV) before and after acid attack of three different concrete mixes after 28, 60 and 90 days of immersion in acid ambient room temperature after 28 days of initial curing in water. In this study, M 25 grade of concrete mixes were manufactured with three different mix proportions such as conventional concrete (CC); CWR_30 concrete with 30% of CWR as coarse aggregate replacement; and FCWR_30 concrete with 30% of CWR as coarse aggregate replacement and 30% of FA as cement replacement. These mixes were then subjected to three acid attacks i.e., 5% hydro chloric acid (HCl),5% magnesium sulphate(MgSo4) and 5% sulphuric acid (H2SO4). Results revealed that FCWR_30 concrete performs similar to CC and better than CWR_30 in the acid environments.

Other Details

Paper ID: IJSRDV5I20013
Published in: Volume : 5, Issue : 2
Publication Date: 01/05/2017
Page(s): 394-397

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