A Review Paper on Sustainable Cost Effective Concrete for Corrosive Environment

R L Darwin ,S Usha

doi:10.7176/cer/11-5-05

Abstract

For its favorable properties and easily availability, the use of concrete increasing annually. When the concrete exposed to environment it start to disintegrate due to chemical attack. The chemical attacks on concrete majorly are in the form of a reaction between aggressive agents and the cement matrix, although reactions can also happen with the aggregates. This review paper gives a suggestion to make a cost effective and durable concrete to perform well in the aggressive corrosion environment by the waste products obtained from different industry. The use of Portland cement concrete has an impact on the environmental due to the emission of CO 2 in the atmosphere. On the other side handling of plastic waste was a major problem all over the world. So, as to give suggestion to these problems the study has been made as the use of rice husk ash (obtained from agricultural waste) and silica fume (obtained from alloy industry) as partial replacement of Portland cement to increase strength at early and later ages. And due to its micro structure it reduce the permeability of concrete and exhibit considerable enhancement in durability, also provides better bond between cement matrix and the aggregate. The usage of LDPE is high throughout the world compared to other plastics, the density of LDPE range from 925-940 kg/m 3 so the density of the concrete greatly reduce up to 30% as their wastes can be used as a replacement for fine aggregate.. In terms of durability the high amount of silica impregnated the concrete samples and thereby reduces porosity of concrete. The strength reduction due to plastics will nearly compensated by the RHA and SF. The use of such waste products gives cost effective and reducing co 2 emission and best method for the disposal of plastic wastes. Keywords: Silica Fume, Rice husk ash, LDPE, Durability DOI : 10.7176/CER/11-5-05 Publication date :June 30 th 2019

Highlights

Cement Concrete Cement concrete is most used material next to water in the earth, because of its economy, ability to be mould to any shape, ability to be fabricated and durability has become popular over the century [1]
For the 30% replacement of rice husk ash (RHA) by cement, the water absorption value reduced about 50% compared to the control mix
The recycling of plastic will yield several harmful by-products, which are very difficult to dispose. Using these plastic wastes in concrete will be a definite solution to the problem of plastic waste disposal

Summary

Introduction

Cement Concrete Cement concrete is most used material next to water in the earth, because of its economy, ability to be mould to any shape, ability to be fabricated and durability has become popular over the century [1]. Ehsan Mohseni et al 2015 conducted experiments on metakaolin (MK) and rice husk ash (RHA) as a partial replacement material for cement, and polypropylene (PP) as an additive, on the mechanical and water absorption properties of mortar, and reported that increasing in the compressive strength of about 13%. The American concrete institute (ACI) defines silica fume as a ‘‘very fine non crystalline silica produced in electric arc furnaces as a byproduct of production of elemental silicon or alloys containing silicon’’ It is usually in the form of grey colored powder, somewhat similar to Portland cement or fly ashes. The small particle size range and the high reactivity of nanoparticles allow them to interact with calcium sources naturally present in cement and concrete, forming binding and strengthening, act as a crack-filling agent, reducing the porosity and thereby increasing the durability of existing materials [20]. Unreacted silica has been absorbed and acts as a filler agent reducing porosity [20]

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