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Bekoe-trb-2010 - Transportation Research Board Presentation...

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Topic: Concrete containing recycled concrete aggregate for use in concrete pavement Presented by: Patrick Amoah Bekoe Other Authors: Dr. Mang Tia and Michael J. Bergin 01/13/2010 Transportation Research Board Presentation Order of Presentation Background and research need Hypothesis of research Research objective Literature review Materials and test methods Test results and discussion Evaluation of potential performance of concrete containing RCA in pavement Conclusions and recommendations
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Background and Research Need Concrete with lower modulus of elasticity would have a lower stress due to the same applied load and thus could have a lower chance of cracking Recycled concrete aggregate (RCA) is currently been used as a base course in flexible pavement but its use in a new rigid pavement has not been fully exploited. With the increasing volume of waste or by-product materials from industry, domestic and mining sources, decreasing availability of landfill space for disposal, depletion of virgin aggregates and the increasing cost of asphalt pavement, recycling has become an obvious choice not only as a base material for flexible pavement but also for new rigid concrete pavements Thus, there is a need to assess the performance of recycled concrete used for concrete pavement Hypothesis of Research Incorporation of Recycled Concrete Aggregates (RCA) in concrete can reduce the modulus of elasticity of concrete mixture and can reduce the load induced stresses in concrete pavements RCA added to concrete mixtures reduces the flexural strength only slightly Addition of RCA to concrete can reduce the stress-strength ratio and thus improve the performance of concrete pavement at critical temperature and load condition.
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