22-04-2014, 04:23 PM
Strength of Concrete by Partial Replacement of Fine Aggregate Using Quarry Dust and
Cement by Silica Fume
Abstract
Sand collected from Aeolian deposit is expensive due to unwanted cost of transportation from natural rivers. Large scale
exploitation of natural sand creates environment impact on the society. River sand is most commonly used fine aggregate in
concrete but due to acute shortage in many areas, availability, cost and environmental impact are the major concern. To overcome
from this crisis, partial replacement of sand with quarry dust can be an economic alternative. In developing countries like India,
quarry dust has been rampantly used in different construction purposes but replacement technology has emerged on innovative
development to civil engineering materials. Design mix of M20 grade concrete with replacement of 5%,10% and 15% have been
considered for laboratory analysis. The ordinary Portland cement is one of the main ingredients in the concrete and has no
alternative in the civil engineering industry. Unfortunately production of cement involves emission of large amounts of carbon-
dioxide gas in to the atmosphere, a major contributor for green house effect and the global warming, hence it is inevitable either to
search for another material or partly replace it by some other material. The search for any such material, which can be used as an
alternative or as a supplementary for cement should lead to global sustainable development and lowest possible environmental
impact. Substantial energy and cost savings can result when industrial by products are used as a partial replacement of cement. Fly
ash, Ground Granulated Blast furnace Slag, Rice husk ash, High Reactive Met kaolin, silica fume are some of the pozzolanic
materials which can be used in concrete as partial replacement of cement number of studies are going on in India as well as abroad
to study the impact of use of these pozzolanic materials as cement replacements and the results are encouraging. Addition of silica
fume to concrete has many advantages like high strength, durability and reduction in cement production. The optimum silica fume
replacement percentage for obtaining maximum 28- days strength of concrete ranged from 10 to20 % Cement replacement up to
10% with silica fume leads to increase in compressive strength, for M20 grade of concrete.