Abstract
The main objective of this study is to utilize the locally available industrial wastes materials like fly ash (FA) and electroplating wastes (S) in bulk for the Civil Engineering works and replacement of weak sub grade soil by stabilizing the fly ash using electroplating waste and other additives like cement (C). The compressive strength tests of the mix containing varying percentages (by weight of fly ash) of electroplating waste sludge (5–60% with an increment of 5% ) and of fly ash-waste sludge-cement have been determined for different curing periods. It has been observed that the significant gain in compressive strength exhibited for waste range 30% to 45%. The percentage increase in 28 days compressive strength for mix containing waste sludge 30─40%, 62─52% fly ash and 8% cement is 36% while for 30% and 45% waste sludge, 70% and 55% fly ash and 8% cement is 13%. The Toxicity Characteristics Leaching Procedure (TCLP) tests were also conducted to determine the heavy metal concentration in the optimized mix. The results of TCLP test show that the heavy metal concentration in the mix 52%FA+40%S+8%S at 28 days of curing reduced substantially from 97 to 100% when compared with the concentration of heavy metals in the waste sludge collected from source. It has also been observed that the pH of the leachate of this mix is between 6.9-10.9, which ensures the proper stabilization of the heavy metals present in the mix
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