Civil Engineering Department

Gore S. L., Tanawade A. G.,Dhonde H. B. and Mahajan M. A.Vishwakarma Institute of Information Technology, Pune


    The water–cement ratio is a convenient measurement whose value is well correlated with PCC strength and durability. In general, lower water–cement ratios produce stronger, more durable PCC. If natural pozzolans are used in the mix such as fly ash, then the ratio becomes a water-cementations material ratio cementations material = port land cement + pozzolonic material.The ACI method bases the water–cement ratio selection on desired compressive strength and then calculates the required cement content based on the selected water–cement ratio.The research was conducted to study the effect of water-cement ratio on the compressive strength of gravel-crushed over burnt bricks concrete. Trial mixes were prepared using the crushed over burnt bricks as coarse aggregates only control, mixture of crushed over burnt bricks and river wash gravel as coarse aggregates and river washed gravel as coarse aggregates only control at water – cement ratios of 0.4, 0.5,0.55 and 0.6. Cubes of concrete were prepared and tested to study the compressive strength in relation to the water-cement ratio. The results indicate that the concrete having over burnt bricks as aggregates may be termed as medium light weight concrete having a density between 2000-2200 kg/m3 and that by reducing the water-cement ratio from 0.6 to 0.4 increases the compressive strength from by more than 30%. Use of broken over burnt bricks as coarse aggregate for structural concrete is recommended when natural aggregate is not easily available, high strength of concrete is not required and the bearing capacity of the soil is low.