透水混凝土的配制

PREPARATION OF PERVIOUS CONCRETE

透水混凝土具有良好的透气性和透水性。试验中采用单粒级和双粒级卵石粗骨料,结果表明:透水混凝土的透水性和抗压强度与混凝土的孔隙率有关;单粒级粗骨料幅差越大,配制的透水混凝土强度越高,透水性越差;双粒级粗骨料配制的透水混凝土性能明显优于单粒级粗骨料,双粒级粗骨料的掺配存在最佳比例。

Pervious concrete has a good air and water permeability. Coarse gravel aggregates of single grain grade and double grain grade are used in the test. The result shows that water permeability and compressive strength of the pervious concrete are related with its porosity ratio. For the coarse aggregate of single grain grade, the bigger the size difference is, the higher the strength and the worse the permeability of the prepared pervious concrete. The water permeability of the double grain grade aggregate is obviously better than that of the single one. There exists, moreover, an optimum proportion between additive and gradation ratio for the coarse aggregate of double grain grade.