砂轻页岩集料混凝土折压比试验研究

Experimental study on flexure and compression′s ratio of sand lightw eight concrete with shale aggregate

研究了砂率对砂轻页岩集料混凝土的折压比的影响规律,以河砂取代率为变化参数,用河砂部分或全部取代页岩陶砂制作成砂轻混凝土,进行了立方体抗压强度、抗折强度等力学性能指标的测试。分析河砂取代率对砂轻混凝土的立方体抗压强度、抗折强度、折压比、类折压比(抗折强度与立方体抗压强度开根号的比值)的影响规律。结果表明:砂轻页岩集料混凝土的破坏形态与普通混凝土相似;随着天然河砂取代率的增加,砂轻页岩集料混凝土的立方体抗压强度、抗折强度逐渐增大,而折压比、类折压比呈现先减小后增大的变化规律;通过回归分析,提出了砂轻页岩集料混凝土抗折强度与立方体抗压强度及河砂取代率间的关系式。

To study the influence law of sand replacement rate on sand lightweight concrete with shale aggregate′s flexure and compression′s ratio,river sand replacement rate as changing parameters,using river sand replacing some or all of shale pottery to make sand lightweight aggregate concrete,and the compressive strength,flexural strength and other mechanical performance index were tested.Analyzed the influence law of river sand replacement rate on sand lightweight concrete cube compressive strength,flexural strength,flexure and compression′s ratio,similar flexure and compression′s ratio(the ratio of flexural strength and cube compressive strength′s square root).The results show that the failure modes of sand lightweight concrete with shale aggregate and ordinary concrete were similar;as the river sand replacement rate increased,compressive strength and flexural strength of sand lightweight concrete with shale aggregate were gradually increased,and flexure and compression′s ratio,similar flexure and compression′s ratio had decreased first and then increased;by regression analysis,sand lightweight concrete with shale aggregate′s relation between flexural strength,cube compressive strength and river sand replacement rate was set up.