Granite powder concrete

T Felixkala

doi:10.17485/ijst/2010/v3i3.6

Abstract

This paper examines the possibility of using granite powder as replacement of sand and partial replacement of cement with fly ash, silica fume, slag and superplasticiser in concrete. The percentage of granite powder added by weight was 0, 25, 50, 75 and 100 as a replacement of sand used in concrete and cement was replaced with 7.5% silica fume, 10% fly ash, 10% slag and 1% superplasticiser. The effects of water ponding temperatures at 26°C and 38°C with 0.4 water-to-binder (w/b) ratios on mechanical properties, plastic and drying shrinkage strain of the concrete were studied and compared with natural fine aggregate concrete. The test results obtained indicate that granite powder of marginal quantity as partial sand replacement has beneficial effect on the mechanical properties such as compressive strength, split tensile strength, modulus of elasticity. Furthermore, the test results indicated that the values of both plastic and drying shrinkage of concrete in the granite powder concrete specimens were nominal than those of ordinary concrete specimens.

Highlights

Fine aggregate is an essential component of concrete
It is well recognized that the use of silica fume as a partial replacement for cement provides a significant increase in strength of concrete (Xiaofeng et al, 1992)
The compressive strength of different concrete mixtures at 26oC and 38oC curing temperatures at 0 different testing ages is presented in day days days

Summary

Introduction

Fine aggregate is an essential component of concrete. The most commonly used fine aggregate is natural river sand. The non-availability of sufficient quantity of ordinary river sand for making cement concrete is affecting the growth of construction industry in many parts of the country. Fly ash and blast furnace slag are generally called as mineral admixtures and called as cement replacement materials. These are pozzolanic in character and develop cementing properties in a similar way as normal Portland cement when they come in contact with free lime. Silica fume is used in concrete for increased strength development, reduced permeability and economy (Francis, 1994) Mineral admixtures such as fly ash and slag have the inherent ability to contribute to continued strength development and very high durability, the latter through pore refinement and reduced sorptivity. The mass of silica fume, when used, represents 5 to 15%

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