Studies on Flexural Behavior of Natural and Recycled Aggregate Concrete Beams Using Glass Fibre

Effects of Glass Fibre Reinforcement on Flexural Behavior of Natural and Recycled Aggregate Concrete Beams

Abstract

The presentinvestigation outlines the use of glass fibre with structural concrete. Glassfibre of length 12mm, diameter 14 micron, having an aspect ratio of 857 wasemployed in percentages and properties of this Glass Fibre Reinforced Concretelike compressive strength and flexural behaviour were studied. In the present work,an attempt is made to investigate the influence of the glass fibre on thenatural and recycled aggregate concrete. Specimens were cast in the form ofCubes and Beams for testing. 30Nos of standard cubes of size 150x150x150mm and 10beams of size 1500x150x230mm were cast and curing were done for 28days.Theflexural behaviour of beams is studied in the present work with  glass fibre for recycled aggregate concrete.There was total of five batches of concrete mixes for the grade M30 for naturaland recycled Aggregate. The glass fibres were added in proportion by 0.50%, 1%,1.5% and 2% by weight of cement. The effect of glass fibres on concrete improvethe flexural strength as well as the compressive strength of concrete, the mostcontributions glass fibres behaves as reinforcement of steel in the concrete. The first batchconsists of six cubes and two beams with natural aggregate, the second batchconsists of six cubes and two beams with recycled aggregate and 0.5% glassfibre by weight of cement, the third batch consists of six cubes and two beamswith recycled aggregate and 1% of glass fibre by weight of cement, the fourthbatch consists of six cubes and two beams with recycled aggregate and 1.5% ofglass fibre, the fifth batch consists of six cubes and two beams with recycledaggregate and 2% of glass fibre. The workability of the concrete considerablyreduced as the amount of fibre increased. For strength characteristics, theresults showed that a compressive strength, flexural strengths graduallyincreases as the percentage of glass fibres used in the specimen increase. Theload carrying capacity of specimens with 100 %( RCA) with 2% fibre content isincreased by 11% compared to that of 100% (RCA) with 0.5% fibre content.Compared to beam A (NCA) 0%fibre, the moment of beam E (RCA) at 2%Fibre isincreased by 56%.