再生混凝土准静态压缩力学性能试验

Experimental Study on Quasi-static Compressive Mechanical Performance of Recycling Concrete

将废弃混凝土经破碎、清洗、筛分、分级,按一定比例相互配合后制成再生混凝土粗骨料,用其部分或全部代替天然粗骨料配制的新混凝土称为再生混凝土。通过制作5组再生粗骨料不同取代率(0,25%,50%,75%,100%)的标准立方体和非标准圆柱体再生混凝土试样,开展一系列的准静态单轴压缩力学性能试验,分析再生混凝土抗压强度、应力应变曲线、峰值应变以及杨氏模量等与再生粗骨料取代率之间的关系。试验发现再生粗骨料取代率与抗压强度、峰值应变和杨氏模量之间呈非线性变化规律,再生混凝土的应力应变曲线与普通混凝土类似。试验结果可为再生混凝土的工程应用提供参考。

Recycling concrete is a new type of concrete that made from the disuse concrete after a series of courses of disposal, such as breaking up, washing, filtration, classification, combination on a certain proportion and so on. Five series of standard cubic and nonstandard cylindrical recycling concrete speci- mens with recycling coarse aggregates of various replacement percentages （i. e. 0, 25% , 50% , 75% and 100% ） are prepared in this study. A series of quasi-static compressive mechanical tests are per- formed. The relationship between the compressive strength, stress-strain curves, peak strain or Young＇ s modulus of recycling concrete and recycling coarse aggregate replacement percentage is studied. Re- sults show that the relationship of compressive strength, peak strain or Young＇ s modulus and recycling coarse aggregate replacement percentage is nonlinear, and stress-strain curve of recycling concrete and normal concrete is similar. These conclusions offer references for the engineering applications of recy- cling concrete.