再生骨料混凝土等高变宽梁抗剪强度试验研究

Experimental research on recycled concrete shear strength of uniform depth beam

比较普通混凝土与再生骨料混凝土,两者性能存在一定的差异,再生混凝土的抗剪性能还末见研究成果发表,两者的抗剪性能可能存在不同而需要研究。试验采用等高变宽梁,考虑混凝土强度等级和再生骨料取代率,研究了再生混凝土梁的抗剪强度和变形及其发展规律,获得了以下成果:①再生骨料混凝土可以达到或接近试配强度,抗压强度随取代率增加而降低;②再生混凝土梁抗剪极限承载力与取代率没有直接的关系;③极限切应力与fcu的回归关系呈开口向上的凹曲线;④再生混凝土梁切应力-主应变曲线接近直线,试验所得抗剪强度相对普通混凝土较低。

Research papers of recycled concrete predicted that there were differences about mechanical property of normal concrete and recycled concrete,but the shear strength research result of recycled concrete was not published,due to this reason this test was designed.In this Paper,section of the test beams was uniform depth and varying width,the stress strength and the strain of the test samples were researched.The result predicted that： ①when the add-ons water was accounted the strength of recycled concrete could reached the strength in mixdesign,the strength decreased when the replacement increased;②the capability of shear resistant had no direct relationship with the replacement of recycled coarse;③the ultimate shear stress regress was a upper open concave curve;④the shear stress-principle strain of sample beams looked like a line,the stress of shear was lower than natural coarse concrete.