The investigation studies the effect that varying the compactive effort has on the Marshall test properties of sand–asphalt–sulphur mixes (S–A–S mixes). An S–A–S mix containing a poorly graded river sand has been chosen for study, the proportions of sand, asphalt, and sulphur being 85:5:10 by weight.Another aspect of this study is to examine the effect of fly ash fines, an industrial waste, on S–A–S mixes. The resulting mix is named S–A–FA–S (sand – asphalt – fly ash – sulphur) and has a percentage composition of 80:5:5:10 by weight.It has been observed that the compactive effort has a definite effect on the Marshall test properties of S–A–S and S–A–FA–S mixes. In both cases, the stability rises initially and then falls with increasing compaction. S–A–FA–S mixes give higher stabilities and lesser air void values than S–A–S mixes at a particular level of compaction. It is concluded that 10 blows of compaction is optimum for S–A–S as well as S–A–FA–S mixes, as the beneficial effect after 10 blows is only marginal.
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