再生粗骨料最大粒径对再生混凝土强度影响试验研究

Experimental Study on Influence of Maximum Particle Size of Recycled Coarse Aggregate on Strength of Recycled Concrete

为了研究再生粗骨料最大粒径对再生混凝土弯拉强度、抗压强度及折压比的影响程度,采用相同配合比下最大粒径为10、15、25和31 mm的再生粗骨料制备了4组再生混凝土棱柱体试件(100 mm×100 mm×400 mm)和4组立方体试件(100 mm×100 mm×100 mm),并通过试验获得了各组再生混凝土试块的弯拉强度和抗压强度。试验结果表明:相同水胶比下,再生混凝土弯拉强度及折压比均随再生粗骨料最大粒径的增大而减小,而抗压强度随再生粗骨料最大粒径的增大呈现出先增大而后减小的趋势。

In order to study the degree of influence of the maximum size of recycled coarse aggregate on the bending and tensile strength,compressive strength and folding ratio of recycled concrete,four groups of recycled concrete prismatic specimens(100 mm×100 mm×400 mm) and four groups of cubic specimens(100 mm×100 mm×100 mm) were prepared by using different volume combinations of the recycled coarse aggregate with maximum sizes of 10,15,25,and 31 mm under the same mixing ratios and the bending and tensile strengths and compressive strengths of the recycled concrete specimens of the various groups were obtained through tests.The results show that under the same water-binder ratio,the flexural strength and flexural-compression ratio of recycled concrete decrease with the increase of the maximum particle size of recycled coarse aggregate,while the compressive strength increases first and then decreases with the increase of the maximum particle size of recycled coarse aggregate.