Influence of admixture on the performance of C40 pervious concrete and mechanism analysis
By studying the influence of polyacrylate emulsion dosage on the compressive strength,flexure strength and pervious coefficient of pervious concrete,its optimum addition amount was determined.SEM and XRD were used to analyze the microscopic morphology and phase composition of pervious concrete.The effects of two coagulants on the compressive strength and slice porosity of pervious concrete were studied,and the strengthening mechanism of different coagulants was obtained.The influence of new nanomaterials(CNFs)on rheological properties and comprehensive properties of pervious concrete slurry was also studied.The re-sults show that the polymer film can be formed in the cement slurry,which can improve the mechanical properties and permeable function of pervious concrete.The strength of group B and group C increased by 65.4％and 77.0％,respectively.The addition of CNFs can make the slurry shear thinning phenomenon,adjust the thixotropic properties of slurry,and at the same time,it can sig-nificantly improve the compressive strength of pervious concrete,and the compressive strength of pervious concrete is the highest in 28 days when the content is 0.15％,which is 56.8％higher than that when it is not mixed.
万方数据
维普
