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Effect of strain rate and water-to-cement ratio on compressive mechanical behavior of cement mortar

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Abstract

Effects of strain rate and water-to-cement ratio on the dynamic compressive mechanical behavior of cement mortar are investigated by split Hopkinson pressure bar (SHPB) tests. 124 specimens are subjected to dynamic uniaxial compressive loadings. Strain rate sensitivity of the materials is measured in terms of failure modes, stress-strain curves, compressive strength, dynamic increase factor (DIF) and critical strain at peak stress. A significant change in the stress-strain response of the materials with each order of magnitude increase in strain rate is clearly seen from test results. The slope of the stress-strain curve after peak value for low water-to-cement ratio is steeper than that of high water-to-cement ratio mortar. The compressive strength increases with increasing strain rate. With increase in strain rate, the dynamic increase factor (DIF) increases. However, this increase in DIF with increase in strain rate does not appear to be a function of the water-to-cement ratio. The critical compressive strain increases with the strain rate.

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Authors and Affiliations

  1. College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China

    Ji-kai Zhou  (周继凯) & Li-mei Ge  (葛利梅)

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  1. Ji-kai Zhou  (周继凯)
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  2. Li-mei Ge  (葛利梅)
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Correspondence to Ji-kai Zhou  (周继凯).

Additional information

Foundation item: Project(51479048) supported by National Natural Science Foundation of China

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Zhou, Jk., Ge, Lm. Effect of strain rate and water-to-cement ratio on compressive mechanical behavior of cement mortar. J. Cent. South Univ. 22, 1087–1095 (2015). https://doi.org/10.1007/s11771-015-2620-9

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  • DOI: https://doi.org/10.1007/s11771-015-2620-9

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