Effect of Partial Replacement of Slag and Nano Silica Infused Slag on Properties of Concrete

Prakash Mallappa Munnoli Prakash Mallappa Munnoli,Jyoti S Garawad Jyoti S Garawad,Tejashwini R Pattar Tejashwini R Pattar

doi:10.15415/jotitt.2017.51005

Prakash Mallappa Munnoli Prakash Mallappa Munnoli, Jyoti S Garawad Jyoti S Garawad + Show 1 more

Open Access

https://doi.org/10.15415/jotitt.2017.51005

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Abstract

Investigations were carried out on the changes in properties of concrete when steel slag is used in concrete in its normal form and after modifying its properties by infusing it with nano-silica. The sand is replaced by steel slag and modified steel slag by 10%, 20% and 30% in M30 grade concrete. Tests results on compressive strength and workability of concrete revealed that compressive strength of concrete cubes after 28 days increased by 25.4%, 26.4% and 45.2% for 10%, 20% and 30% respectively after replacing sand by steel slag. After modification of steel slag properties by infusing it with nano silica, the 28 days compressive strength was observed to be increased by 38.19%, 35.80% and 27.89% for 10%, 20% and 30% as compared to traditional concrete mix respectively after replacement. Infusing steel slag with nano silica increased the compressive strength of concrete mix by 20.17%, 25.74% and 49.64% for 10%, 20% and 30% respectively when compared to normal steel slag concrete mix. It was also observed that using steel slag in concrete mix also influences on water consumption in concrete mix. Workability tests conducted using 0.45 and 0.5 w/c ratio and the inference was that the workability increased with the increase in percentage of steel slag but workability decreases with the increase in percentage of modified steel slag.

Highlights

Journal on Today’s Ideas – Tomorrow’s Technologies, Vol 5, No 1, June 2017 pp. 64–75Concrete is the main heterogeneous composite material used in construction industry, whose main ingredients are cement, Fine aggregate (FA), Coarse aggregate (CA), water
Infusing steel slag with nano silica increased the compressive strength of concrete mix by 20.17%, 25.74% and 49.64% for 10%, 20% and 30% respectively when compared to normal steel slag concrete mix
Particle size distribution (PSD) of the FA and crushed Steel slag (SS) passing through the 4.75mm sieve tested were confirming to zone II of IS code 383-1970.Which is most favourable for concrete making

Summary

INTRODUCTION

Journal on Today’s Ideas – Tomorrow’s Technologies, Vol 5, No 1, June 2017 pp. 64–75. Industrial solid wastes with moderate to high specific gravity are considered to be useful in making concrete. The utilization of solid wastes in construction at low cost and reducing load on natural resources is one of the innovative ideas globally accepted The estimated quantity of solid wastes generation was 12 billion tons in the year 2002 (Pappu et al, 2007) Among this amount, 11 billion tons were industrial solid wastes and 1.6 billion tons were municipal solid wastes and likely to touch 19 BTY-1 by 2025 (Yoshizawa et al, 2004). (Pappu et al.,2007).the recycling of hazardous wastes for use in construction materials and the environmental impact of such practices have been studied for many years (Cyr et al, 2004).

MATERIALS AND METHODS

RESULTS AND DISCUSSION

CONCLUSION