全沙漠砂纤维水泥基复合材料单轴受压尺寸效应试验研究

In order to explore the feasibility of using desert sand entirely to prepare engineered cementi-tious composites (ECCs) in Xinjiang region , and study the uniaxial compression size effect of ECCs whichare prepared entirely from desert sand , on the basis of analyzing and comparing the macroscopic mechani-cal properties and microstructure of ECCs prepared by three aggregates ( i. e. , desert sand, quartz sand,and river sand) , the uniaxial compression tests of five groups of desert sand ECC specimens with differentsizes were carried out. The results show that at the same ratio of materials , the ECCs prepared entirely byusing desert sand have compressive , tensile , and flexural strength similar to that of the ECC prepared by the other two kinds of sand , in desert sand ECCs , fewer attachments and relatively complete morphology offiber surface are beneficial to its bridging effect;the uniaxial compression properties of ECC prepared en-tirely by using desert sand have size effect ; the expression of the relation between height-thickness ratioand compressive strength , and the stress-strain full curve model with dfferent height-thickness ratio are ingood agreement with the test results.