Experimental Research On Basic Mechanical Performance Of The Engineered Cementitious Composites In Urumqi Area

The Engineered Cementitious Composites(ECC)is a fiber-reinforced cement-based composite with good tensile and flexural properties.The raw materials of the Engineered Cementitious Composites mainly include cement,fine sand,mineral admixture and so on.The performance of raw materials effects on the basic mechanical performance and deformation ability of Engineered Cementitious Composites.Based on the manufacture of ECC in Urumqi area,this paper studied the basic mechanical performance of the ECC specimens.The initial cracking strength,ultimate tensile strength and tensile strength of the ECC specimens were studied by uniaxial tensile tests.The effects of water-cement ratio,mineral admixture type(fly ash,slag)and the dosage and age and other properties,and use the analytic hierarchy process to determine the optimal mix ratio.On this basis,the use of desert sand instead of sand washing,the production of uniaxial tensile test specimens,cube compression test specimens,bending test specimens.Through the analysis of test and the results,the difference of sand and desert sand PE-ECC specimens were obtained.The bending behavior of the three groups of sheets,the initial crack initiation load,the ultimate load,the bending deformation and so on were obtained by comparing the test results with the same size of the reinforced concrete sheet.Based on the results above,it is possible to manufacture the ECC by the raw materials in the area in Urumqi and the desert sand.It showed good tensile and flexural properties,and it provides some data support and theoretical basis for the application of ECC in Xinjiang area.