Abstract:
Currently, developing countries are taking major steps for development of infrastructure and for fulfilling this aim, huge amount of concrete is required. Portland cement is a big source of environmental pollution. Therefore, it is necessary to find an alternative to cement with more environmental friendly material like lime.
In this study detail experimental investigation on properties of concrete made from putty (lime slaked for ½ and one year) and powder lime as partial replacement of cement discussed. However, all other parameters of mixture were kept constant. Experimental investigations conduct to assess the workability of fresh concrete, compressive strength of harded concrete, and change in linear dimension of samples. A concrete mix with specified compressive strength of C-20/25 has been prepared with 0%, 10%, 20%, and 30% of cement replaced by lime. Compressive strength and change in linear dimension test of all types of mixture was conducted after 28, 42, and 56 days of standard moist curing. It was observed that in this study inclusion of all form of lime as partial replacement of cement reduces the workability of concrete with increasing of lime content and no slump at all at 30% lime replacement. Compressive strength of concrete decreased with increasing of lime content in all form of lime but increase with curing period. Concrete made from 10% powder lime as partial replacement of cement had better compressive strength and comparable to conventional concrete at 28 days than putty lime. However, Concrete made from powder lime had greater compressive strength at 42 and 56 curing days than conventional concrete up to 20% PL. Slaking of lime and its long slaking period had negative effect on concrete compressive strength. It was observed that inclusion of lime as partial replacement of cement has no effect on volumetric stability of concrete sample at all curing period. Cost of concrete made from cement alone is the cheapest than powder and putty lime-concrete. The slaked limecement concrete is expensive than powder lime concrete due to additional cost during slaking processes of lime. Density of concrete made lime as partial replacement of cement at 28 days was remaining the same.