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• W2019424246 endingPage "886" @default.
• W2019424246 startingPage "869" @default.
• W2019424246 abstract "Understanding the behavior of concrete and mortar at very high strain rates is of critical importance in a range of applications. Under highly dynamic conditions, the strain-rate dependence of material response and high levels of hydrostatic pressure cause the material behavior to be significantly different from what is observed under quasistatic conditions. The behavior of concrete and mortar at strain rates of the order of 10 4 s −1 and pressures up to 1.5 GPa are studied experimentally. The mortar analyzed has the same composition and processing conditions as the matrix phase in the concrete, allowing the effect of concrete microstructure to be delineated. The focus is on the effects of loading rate, hydrostatic pressure and microstructural heterogeneity on the load-carrying capacities of the materials. This experimental investigation uses split Hopkinson pressure bar (SHPB) and plate impact to achieve a range of loading rate and hydrostatic pressure. The SHPB experiments involve strain rates between 250 and 1700 s −1 without lateral confinement and the plate impact experiments subject the materials to deformation at strain rates of the order of 10 4 s −1 with confining pressures of 1–1.5 GPa. Experiments indicate that the load-carrying capacities of the concrete and mortar increase significantly with strain rate and hydrostatic pressure. The compressive flow stress of mortar at a strain rate of 1700 s −1 is approximately four times its quasistatic strength. Under the conditions of plate impact involving impact velocities of approximately 330 ms −1 , the average flow stress is 1.7 GPa for the concrete and 1.3 GPa for the mortar. In contrast, the corresponding unconfined quasistatic compressive strengths are only 30 and 46 MPa, respectively. Due to the composite microstructure of concrete, deformation and stresses are nonuniform in the specimens. The effects of material inhomogeneity on the measurements during the impact experiments are analyzed using a four-beam VISAR laser interferometer system." @default.
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• W2019424246 date "2001-10-01" @default.
• W2019424246 modified "2023-10-05" @default.
• W2019424246 title "Dynamic behavior of concrete at high strain rates and pressures: I. experimental characterization" @default.
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• W2019424246 doi "https://doi.org/10.1016/s0734-743x(01)00020-3" @default.
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