members durability and density at 28 days

members are reinforced with continuous reinforcing bars to withstand tensile stresses and to compensate for the lack of ductility and strength. The addition of steel reinforcement to concrete significantly increases its strength, but to produce a concrete with homogenous tensile properties and better micro cracking behaviour, fibres are advantageous. The introduction of fibres in concrete has brought a solution to develop a concrete having enhanced flexural and tensile strength, which are a new form of composite material. At the micro-level, fibres inhibit the initiation and growth of cracks, and after the micro-cracks coalesce into macro-cracks, fibres provide mechanisms that abate their unstable propagation, provide effective bridging, and impart sources of strength gain, toughness and ductility. Fibres are mostly discontinuous, randomly distributed throughout the cement matrices. The randomly distributed short fibres are generally introduced into concrete to enhance its control crack system and mechanical properties such as toughness, impact resistance, ductility (post cracking), tensile strength etc. of basic matrix. There are many kinds of fibres, such as metallic, synthetic, natural etc which are being used in normal concrete as shown in Fig 1. The term fibre based concrete (FBC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibres that are uniformly distributed and randomly oriented.

1.1. Importance of Waste Glass Recycling

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  The quantity of glass wastes generated in industrialized countries every year is quite high. Thus, the reuse of waste materials is encouraged for the conservation of non-renewable natural resources. Recent research findings have shown that concrete made with recycled glass aggregate have shown better long term strength and better thermal insulation due to its better thermal properties of the glass aggregates (Bong-Chum Lee, 2004).Nowadays, it is already in use for architectural and decorative applications and in some applications that do not require high strength (Meyer et al, 2001).

Malik et al (2013), studied the issues of environmental and economic concern addressed by the use of waste glass as partial replacement of fine aggregates in concrete. Fine aggregates were replaced by waste glass powder as 10%, 20%, 30% and 40% by weight for M-25 mix. The concrete specimens were tested for compressive strength, splitting tensile strength, durability and density at 28 days of age and the results obtained were compared with those of normal concrete. The results concluded the permissibility of using waste glass powder as partial replacement of fine aggregates up to 30% by weight for particle size of range 0-1.18mm.Slump Test The workability of all concrete mixtures was determined through slump test utilizing a metallic slump mould.

Salman et al (2013),investigated correlation between some physical properties of glasscrete and replaced both fine aggregate (sand) and coarse aggregates (gravel) with fine sheet glass size (2.36-4.75mm) and crushed waste glass size (9-12mm) respectively.The substituting of sand and gravel in proportions were (10%, 20%, 30%, 40%, 50%) by fine and crushed glass sheet waste respectively. The following main conclusions were achieved from their experimental study. Clear glass waste can be substitute the natural aggregates and substitution of fine aggregate is more beneficial than the coarse aggregate and the homogeneity can play a major role in evaluating 

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