矿粉和骨料对白水泥透水混凝土性能的影响

采用矿粉等量代替白水泥的方法进行改性,研究考察不同矿粉掺量和不同骨料粒径对白水泥透水混凝土孔隙率、透水性能及抗压强度的影响,并分析其作用机理,以改善白水泥透水混凝土的综合性能。结果表明,相比于单一粒径骨料透水混凝土,级配粒径骨料透水混凝土的抗压强度较高,透水性能较差。掺加矿粉能够有效促进白水泥透水混凝土强度增加,且最佳掺加量为30%。同一矿粉掺加量下,三种骨料组合中的4.75-9.50 mm与2.35-4.75 mm两种粒径级配骨料的白水泥透水混凝土强度最高,且当矿粉掺加量为30%时,试块综合性能最佳,抗压强度为22.18 MPa,透水系数为 0.453 cm/s。

Influence of Mineral Powder and Aggregate on Performance of White Cement Permeable Concrete

In order to improve comprehensive performance of white cement permeable concrete,the equal replacement of cement by mineral powder was tested to modify its performance. The influence of different mineral powders and aggregate sizes on porosity,water permeability and compressive strength of white cement permeable concrete were studied and the mechanism was analyzed. The results showed that the compressive strength of graded aggregate permeable concrete was greater and the permeable property was worse than those of mono-sized permeable concrete. Adding mineral powder could improve comprehensive performance of white cement permeable concrete and the best dosage was 30%. When aggregate of permeable concrete was graded by macadam of 4. 75-9. 50 mm and 2. 35-4. 75 mm,its strength was the best among three kinds of aggregate at the same dosage of mineral powder. The comprehensive performance of the test block was the best when dosage was 30%. Its compressive strength was 22. 18 MPa and permeability coefficient was 0. 453 cm/s.