再生混凝土单轴受压应力—应变全曲线试验研究

Experimental Investigation on Complete Stress-Strain Curve of Recycled Concrete Under Uniaxial Loading

完成了不同再生粗骨料取代率下再生混凝土的单轴受压应力—应变全曲线试验,分析了再生粗骨料取代率对再生混凝土的应力—应变全曲线形状和再生混凝土抗压强度、弹性模量、峰值及极限应变的影响.研究表明,再生混凝土的应力—应变全曲线的总体形状与普通混凝土的相似,但曲线上各特征点的应力和应变值有所区别;再生混凝土的棱柱体抗压强度与立方体抗压强度的比值高于普通混凝土;再生混凝土的峰值应变大于普通混凝土;再生混凝土的弹性模量明显低于普通混凝土.再生混凝土应力—应变全曲线的上升段和下降段可以分别用3次多项式和有理分式拟合.

The complete stress-strain curves of recycled aggregate concrete with different recycled coarse aggregate replacement percentages were tested and investigated. An analysis was made of the influence of varying recycled coarse aggregate contents on the complete stress-strain curve, peak stress, peak strain, elastic modulus and compressive strength etc. The test results show that the stress-strain curves of recycled aggregate concrete are similar to those of the conventional concrete. Whereas for the recycled aggregate concrete, the ratios of the prism compressive strength to the cube compressive strength and the peak strain are higher but the elastic modulus is lower than those of the conventional concrete. Finally, equations are proposed for the complete stress-strain curve of recycled aggregate concrete with different recycled coarse aggregate replacement percentages.