关键词: 海绵城市;透水;泡沫混凝土;水分保持

Abstract: Sponge city is currently being vigorously pursued the goal of urban construction in China. Municipal facilities, such as urban roads, green space and drainage network, not only have fast percolation function, but also have certain water-retention function.A novel foam concrete with permeable and water-retaining function is developed by using foaming agents and gas-producing agents on the basis of traditional foamed concrete.The effects of water-cement ratio, foaming agent dosage, sand content and glass fiber content on the permeability of materials are studied systematically.On the basis of this,the relationship between moisture retention and water permeability of the materials is studied.The results show that the permeability of the material increases first and then decreases with the increase of water-cement ratio,foaming agent dosage and sand content,and decreases with the increase of glass fiber content.The foamed concrete material with better water permeability and water-retention can be obtained by reasonable control of the preparation process to meet the needs of the construction of sponge city.

Key words: sponge city;permeable;foam concrete;water-retention