多因素对再生骨料透水混凝土性能的影响及其协同优化研究

Study on the effect of multi-factors on the performance of recycled aggregate pervious concrete and its cooperative optimization of multiple performances

研究了骨料级配、水灰比、砂率、设计孔隙率、胶骨比等因素对再生骨料透水混凝土透水系数、抗压强度与弯拉强度的影响;并通过改变水泥品种、添加增强剂、电炉渣与再生骨料复配等方式协同优化再生骨料透水混凝土透水性能、力学性能、抗冻性能、路用性能。结果表明:再生骨料透水混凝土抗压强度和透水性能影响因素主次顺序均为:设计孔隙率>骨料级配>砂率>水灰比;建议再生骨料透水混凝土设计孔隙率为10%~20%,水灰比为0.29~0.32,砂率控制在5%~10%,胶骨比为0.29;采用电炉渣可以大幅提升透水混凝土的力学性能和耐磨性能,但其透水性和抗冻性相差不大。

The effects of multi-factors such as aggregate gradation,water-cement ratio,sand ratio,designed porosity and binder bone ratio on the permeability coefficient,compressive strength and flexural strength of recycled aggregate permeable concrete were studied.The cement permeability,mechanical properties,frost resistance and road performance of the recycled aggregate permeable concrete were optimized by changing the cement variety,adding reinforcing agent,mixing recycled aggregate with electric furnace slag.The results show that the influence factors on the compressive strength and water permeability of the recycled aggregate are as follows:design porosity>aggregate gradation>sand ratio>water-gel ratio.It is suggested that the porosity of the recycled aggregate permeable concrete should be 10%~20%,the water-binder ratio should be 0.29~0.32,the sand ratio should be 5%~10%,and the binder-bone ratio should be 0.29.The electric slag can greatly improve the mechanical properties and wear resistance of the permeable concrete.But its water permeability and frost resistance are not much different.