Reuse of the lower density of glass aggregates,

Reuse of glass waste in concrete industries in India is not broadly developed, while its application in concrete-based products can sustain the challenge that faces the solid waste management and the greening of the environment. If fine aggregate is replaced by waste glass by specific percentage and specific size range, it will reduce fine aggregate content and, thus decreasing the ill effects of river dredging, thus making concrete manufacturing industry sustainable. In order to make concrete industry sustainable, the use of waste materials in place of natural resources is one of the best strategies. Sand consumes around 20 to 27% of concrete by volume, thus playing an important role in fresh and hardened properties of concrete (Neville, 1995). There is significant interest in the development of concrete using waste glass recycling of waste glass as an aggregate is effective for environmental conservation and economical aspects. UK produces over three million tons of waste glass annually (Turgut and Yahlizade, 2009). In India, 0.7% of total urban waste generated comprises of glass (Central Pollution Control Board, 2000). The purpose of this study is to evaluate properties of Concrete mixes containing waste glass as fine aggregate  in varying percentages in Concrete mixes in both fresh and hardened states and find the optimum dosage of FWGA in  which higher compressive strength, flexural strength and fatigue life of structures can be achieved.

Key words: Glass Aggregates, Concrete, Fine waste glass aggregates (FWGA) ,Compressive strength ,  Flexural strength .


1. Introduction

 Concrete is known to be a brittle material when subjected to tensile stresses and impact loads; tensile strength of the concrete is approximately one tenth of its compressive strength. The addition of waste glass as an aggregates caused a slight weight reduction and it is because of the lower specific gravity of glass aggregates as compare to fine aggregates (sand), also dry density of the concrete mixes having glass aggregates showed decreasing tendency and this again because of the lower density of glass aggregates, compared to sand. The unit weight of concrete is reduced by replacing natural fine aggregate with glass (Topcu and Canbaz, 2004). The dry density of concrete mix with 40% glass replacement level was 4,5% lighter than concrete with sand used and the dry density of the same mix was 2.4% lower than the control mix (Adaway and Wang ,2015).A clear reduction of the fresh density is observed with the incorporation of glass aggregates. This reducing trend is explained by the difference between natural aggregates and glass aggregates in terms of particles density (Castro and Brito, 2012).

As a result of this, concrete members are unable to withstand such loads and stress that are usually encountered by concrete structural members. Usually, concrete