The use of geogrid reinforcement for enhancing the performance of concrete overlays -

Abstract

The objective of this research is to assess the feasibility of the use of geogrid as main reinforcement in thin concrete members such as overlays to enhance their performance by providing additional tensile strength and ductility. More importantly, the aim is to study the ability of geogrid to control crack propagation and mitigate reflective cracking. For that reason, experimental setups were prepared to assess and quantify the effect of inclusion of the geogrid in Portland cement concrete overlays under mode I cracking. The experiments comprise of two tests: the direct tension test and the flexure test. These two tests are conducted on plain concrete samples and reinforced concrete with one layer of uniaxial geogrid. On the other hand, finite element mathematical models were developed using ADINA to simulate the performance of the prepared specimens. These models are also calibrated with experimental results for later investigation and sensitivity analysis. Results of testing confirm the geogrid reinforcement enhances the performance of the concrete overlay in terms of post-cracking behavior, crack mouth opening displacement and mode of failure.