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Shear Behavior of Recycled Aggregate Concrete Beams

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The amount of construction and demolition waste has increased considerably over the last few decades. From environmental preservation point of view and effective utilization of natural resources, crushing concrete to produce coarse aggregate for the production of new concrete is one of the common means for achieving a more environmental-friendly concrete. Twelve beam specimens were cast and tested to investigate the effect of recycled concrete aggregate (RCA) on shear behavior of reinforcement concrete. The test variables were RCA replacement ratios, RCA sizes and shear span to depth ratios (a/d). Test results of concrete compressive strength indicated that, replacement of natural aggregate more than 30% recycled concrete aggregates in mixes led to decrease of concrete compressive strength. The ultimate shear strength of beams with recycled concrete aggregates 9.5 and 25 mm and shear span to depth ratio 1.25 and 2.5 is less than those with natural aggregates. The ultimate shear strength of beams with RCA size 25 mm is higher than those with RCA size 9.5 mm. The test results were compared with shear strength predicted using national Egyptian code (ECP 203-2007) and some international codes such as ACI 318-2001, New Zealand code (NZS 3101-2006) and British standard (BS 8110-1997). The study showed that code equations for predicting ultimate shear strength of NCAC can be used for RCA beams up to 60% replacement with no modifications.
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Recycled Concrete; Recycled Aggregate Size; Shear Strength

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