Failure Behavior Of Epoxy Polymer Concrete Under Combined Compression-shear Loading

The premature failure of current asphalt paving materials for steel bridge decks has always been a concern.Epoxy polymer concrete is a new type of polymer concrete with good adhesion and superior mechanical properties,which is expected to solve this unresolved problem.Concrete is often in a multi-axial stress state in practical engineering applications,and the strain rate in each direction is also different.However,due to the difficulty of implementing true triaxial dynamic experiments,there is still a lack of research on the multiaxial dynamic mechanical properties of concrete.Even for the most common study of compression-shear characteristics,there are still many areas that need to be improved due to the need to consider the compression-shear loading coupling effect and strain rate effect at the same time.Therefore,in order to enrich the research on the dynamic compression and shear performance of epoxy polymer concrete,this paper conducts an in-depth study on the mechanical response and failure behavior of epoxy polymer concrete under combined compression-shear loading.Firstly,a quasi-static and dynamic compression-shear combined loading device was built to study the mechanical response of epoxy polymer concrete at different strain rates and different compression-shear ratios,and a finite element model was established to verify the feasibility and rationality of the test.Secondly,quasi-static and dynamic compression-shear tests considering different strain rates and compression-shear ratios were conducted.The mechanical response and failure mode of epoxy polymer concrete at different strain rates and different compression-shear ratios were then studied,and the effect of strain rate and compression-shear ratio on the failure mechanism of epoxy polymer concrete was analyzed.Finally,based on the Drucker Prager criterion and unified strength theory,the failure criterion of epoxy polymer concrete under combined compression-shear loading was proposed,and the prediction results were in good agreement with the experimental data and have clear physical significance.The work of this paper is aimed to study the mechanical properties of epoxy polymer concrete considering both strain rate and compression-shear ratio.The experimental testing techniques and analysis methods involved provide a reference for the study of the failure behavior of concrete materials under multiaxial loading.At the same time,it has important guiding significance for the performance evaluation and application of advanced engineering material like epoxy polymer concrete.