塑性混凝土单向受压应力-应变关系的试验研究

Experimental study on axial compressive strain-stress relationship of plastic concrete

通过棱柱体试件的单向受压试验,研究了水胶比和龄期对塑性混凝土单向受压的应力-应变曲线的影响。研究结果表明,单向受压下塑性混凝土的峰值应力随水胶比增加而减小,随龄期的增加而增大,其峰值应变基本在3000με以上,平均值为3528με;塑性混凝土应力应变曲线上升段斜率、下降段曲率及陡峭程度均随水胶比的减小或龄期的增加而增大;塑性混凝土单向受压中吸收的能量随峰值应力的增加而线性增加。通过对试验结果的分析,建立了塑性混凝土弹性模量、吸收能量、应力-应变曲线参数a1和a2与峰值应力间的关系式及峰值应力、a2与水胶比和龄期间的关系式。在此基础上,提出了考虑水胶比和龄期影响的单向受压下塑性混凝土应力-应变关系数学表达式。

Based on the axial compressive test of the prism specimens with the dimensions of 150mm×50mm×300mm,the influence of the ratio of water to cementation materials and curving age on the axial compressive strain-stress relationship of plastic concrete is investigated.The results show that the peak stress under axial compression decreases with the increase of the ratio of water to cementation materials,and increases with the increase of curving age.The peak strains for the most part of specimens are higher than ...