Abstract:
Concrete's ingredients, cement, coarse and fine aggregates, are consumed in large quantities due
to the world's ever-increasing demand for it. This puts strain on the cement industry, while
coarse and fine aggregate production is similarly strained, resulting in environmental
degradation.Locally available waste materials , Rice husk ash (RHA), Sugar cane bagasse ash
(SCBA) and Limestone Powder (LS) were used as a partial substitution of cement along with
Stone Dust (SD) as a partial substitution of sand in this study. Effect of these dually replaced
waste materials on fresh and hardened concrete were examined. Percentage substitution of RHA,
SCBA and LS were kept as 0 ,10, 15 and 20% along with 0 ,25 and 50% SD substitution. Result
indicated the decrease in workability due to dual substitution. Fresh density increased by
incorporating LS along with SD . Compressive, Tensile and Flexural strengths enhanced in case
of RHA and SCBA substitution along with SD. Water absorption and volume of permeable
voids improved by incorporating SD with sand in mixes. Drying shrinkage occurred faster at the
first phase of 7 days and slowed down later. These substitution showed an improved behavior of
concrete towards environment and will result in the utilization of waste materials and will
reduce the strain on quarry sites and will provide an alternate option.
