Flexural Strength of Reinforced Concrete Beams Incorporating Coarse Recycled Concrete Aggregate

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Title: Flexural Strength of Reinforced Concrete Beams Incorporating Coarse Recycled Concrete Aggregate

Author(s): Ardavan Yazdanbakhsh, Lawrence C. Bank, and Jonathan Rosen

Publication: Special Publication

Volume: 314

Issue:

Appears on pages(s): 1-12

Keywords: Reinforced beams, recycled concrete aggregate, flexural performance, structural concrete.

Date: 3/1/2017

Abstract:
In the past, many investigations have studied the effect of replacing coarse natural aggregate (CNA) with coarse recycled concrete aggregates (CRCA) on “material” properties of concrete, particularly compressive strength. This article reports on a research program in which (1) commonly used and practical methods were used for mixture design, proportioning, and production of CRCA and CNA concrete batches, (2) reinforced concrete beam specimens were produced from both types of concrete and tested in a bending configuration for measuring load-deflection response, moment capacity, and failure mode, and (3) a theoretical investigation was performed to predict the effect of concrete strength on the moment capacity of the beams. The test results showed, as predicted by the theoretical study, that the reduction in moment capacity caused by the strength loss due to the replacement of natural aggregate with CRCA, was negligible. It was also observed that the scatter of load carrying capacities of CRCA and CNA concretes were both very low and had coefficient of variation values of 0.048 and 0.064 respectively.