科研之友
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摘要
Compared with the traditional concrete, the concrete fully made with the lightweight aggregate exhibits remarkable reduction in mechanical properties and is not suitable for the structural elements. To improve the performance of concrete, a hybrid aggregate system is usually used through partially substituting the natural crushed stone by the artificial lightweight aggregate. Using the expanded shale as the artificial lightweight aggregate, the stress-strain relation and Poisson effect of concrete were studied in the present study. Four different volume contents of shale aggregate were used in the experiment, and the effect of the volume content of shale on the mechanical properties of concrete was investigated. The reduction of peak stress and modulus of elasticity was observed with increase of the volume fraction of shale aggregate. However, the axial and lateral strains corresponding to the peak stress increase with the volume fraction of the shale aggregate. From the ratio of the lateral strain to the axial strain, a more significant Poisson effect was viewed for the concrete with higher content of the shale aggregate. Using the volume content of lightweight aggregate as the model parameter, a numerical formula was finally proposed to describe the stress-strain relation of lightweight concrete.
