Abstract
The dynamic mechanical properties of concrete materials are important parameters for evaluating the safety performance of concrete structures under dynamic loads. Fiber cement-based materials have been widely used in the construction projects due to their strength, toughening, and cracking resistance. In this study, we conducted experimental and theoretical studies on dynamic compression and tensile mechanical properties of different proportions of new-type fiber concrete. A Split-Hopkinson pressure bar equipment was used to determine the concrete behavior at different strain rates. The effects of strain rate and fiber content on the strength of the specimen, dynamic increase factor, and ultimate strain were analyzed. Based on the macrodamage factor, the traditional nonlinear viscoelastic constitutive model was simplified and improved. The four-parameter constitutive model was obtained, and the influence of these parameters on the performance of fiber concrete was analyzed. The experimental results were compared with those predicted from the available equations, and results were in accordance. Finally, an analytical equation for predicting the dynamic compression and tensile properties of these new-type fibers was proposed.
Highlights
Concrete as a common construction material used in the industry may often be subjected to dynamic loads during service, and concrete compression and tensile performances are important parameters for evaluating structures and building safety and stability
Tensile properties of the concrete material are significantly lower than the compression resistance, resulting in the structure being prone to tensile damage, and the dynamic direct tensile properties are difficult to measure directly by the test
When the tensile stress of the outward expansion reaches the peak tensile stress of the concrete material, the concrete specimen is damaged; the concrete crack is weakened from the joint by the matrix
Summary
Concrete as a common construction material used in the industry may often be subjected to dynamic loads during service, and concrete compression and tensile performances are important parameters for evaluating structures and building safety and stability. Most research on properties of concrete subjected to high strain rate loadings has focused on compressive strength. Research on polyvinyl alcohol (PVA) fiber cement composite material and its dynamic mechanical properties have not yet been agreed with credible conclusions, and the use of ultra-high-molecular weight polyethylene (UHMWPE) on the mechanical properties of fiberreinforced concrete under impact load is almost blank. Erefore, in this study, the dynamic tensile test of UHMWPE and PVA fiber concrete is carried out by a SplitHopkinson pressure bar (SHPB) impact device, and the dynamic tensile effect of fiber concrete with different strain rates were obtained. Dynamic compressive and tensile characteristics of UHMWPE and PVA fibers reinforced concrete in terms of failure mode of fiber concrete, the evaluation of the antisliding ability of the above fiber concrete, the influence of strain rate on the tensile strength, dynamic increase factor and dissipative energy of the test piece, and the establishment of uniformity between dynamic and static tensile strain and strain rate model are studied
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