Journal of Food, Agriculture and Environment

Effect of strain rate and moisture content on dynamic mechanical properties of cement mortar

Author(s):

Zhenghong Tian *, Jingwu Bu, Ce Bian

Recieved Date: 2013-06-19, Accepted Date: 2013-09-30

Abstract:

The effect of free water content upon the compressive mechanical behavior of cement mortar under high strain rate was studied in this paper. The uniaxial rapid compressive loading testing, i.e., the impact velocity was 10 m/s which equal to the strain rate was 10² s^-1 by Split Hopkinson pressure bar (SHPB), on total of 30 specimens with water-cement ratio of 0.50 and saturations as 0%, 25%, 50%, 75% and 100% respectively, were executed. The dynamic compressive behavior of the materials was analyzed in terms of the maximum stress, Young’s modulus, critical strain at maximum stress and ultimate strain at failure. The data obtained from test indicated that the similarity existed in the shape of strain-stress curves of cement mortars with different water content, that is, the upward section of the stress-strain curves presented bilinear characteristics, while the descending stage (softening state) were almost linear. It was shown that desiccation provokes an increase in mortar strength. At the same time, the elastic properties of material evolve: Young’s modulus and deformation behavior changes with the saturation ratio for the studied mortar. These different phenomena come from capillary depression generated by drying, as well as the microcracking created by the differential contraction between the core and the samples’ edges and by the aggregates’ presence. A drying damage is then obtained without mechanical loading. Such a drying effect has to be taken into account in modeling of the coupling between desiccation and mechanical behavior of cement mortar.

Keywords:

Cement mortar, free water content, dynamic compressive mechanical behavior, Split Hopkinson pressure bar

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2613-2618

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