若干因素对多孔透水混凝土性能的影响

Effects of Some Factors on Properties of Porous Pervious Concrete

研究了若干因素如骨料级配与粒径、骨灰比、水灰比、外加剂及搅拌工艺等对多孔透水混凝土的空隙率、透水系数与抗压强度等性能的影响.结果表明:骨料粒径与级配、骨灰比是影响多孔透水混凝土空隙率、透水系数与抗压强度的关键因素;水灰比对多孔透水混凝土的性能影响较小;减水剂、硅灰及聚合物乳液等外加剂可改善多孔透水混凝土的性能;水泥裹石法搅拌工艺对多孔透水混凝土的透水系数影响不大,但能使其抗压强度提高、空隙率下降.

Effects of some factors such as gradation and particle size of aggregate, mass ratio of aggregate to cement,mass ratio of water to cement, admixtures and mixing process on the properties of porous pervious concrete（PPC） including porosity, permeation coefficient and compressive strength were studied. The results indicate, gradation and particle size of aggregate, mass ratio of aggregate to cement are the key factors affecting porosity, permeation coefficient and compres- sive strength of PPC. Mass ratio of water to cement has minor effect on properties of PPC. Ad- mixtures such as water-reducing admixture, silica fume and polymer latex improve properties of PPC. The mixing process of cement paste encapsulating aggregate method could improve the compressive strength of PPC and reduce its porosity while keeping its permeation coefficient stable.