透水混凝土的试验研究及工程应用
摘要:透水混凝土又称为无砂混凝土。它由胶凝材料、粗骨料、水和外加剂按照一定的比例拌合而成。由于透水混凝土硬化后水泥石中存在着较大的孔洞,具有良好的渗透性能,可缓解城市的“热岛效应”,吸声降噪,有效改善城市的热环境,北京奥林匹克公园中心区域绿化工程项目即采用了透水混凝土。本文从水泥性能、粗骨料、水灰比、细骨料掺量等几个方面进行对比试验,研究了以上几个因素对透水混凝土性能的影响。
关键词:透水混凝土;骨料;水灰比;空隙率
Abstract: Pervious concrete, also known as non-sand concrete, is mixed by cementitious material, coarse aggregate, water and admixtures in accordance with a certain proportion. Due to large holes in hardened cement paste of the permeable concrete, it has a good permeability, which can alleviate the urban "heat island" effect, reduce noise, and effectively improve the urban thermal environment. Therefore, it has been applied in the greening project of the central area of Beijing Olympic Park. In the paper, the comparative tests from the cement performance, coarse aggregate content, water-cement ratio content, fine aggregate content are be presented, as well as the research on the impacts of the performance of pervious concrete from the above content factors.
Key words: pervious concrete; aggregate; water-cement ratio; porosity
中图分类号:TU377文献标识码:A文章编号:2095-2104(2012)
1 引言
城市道路、人行道、广场等城市设施无论是在设计还是在施工上,历来都强调要求混凝土密实、不透水。这种观念在我国诸多建设领域被广泛接受,殊不知这种不透水地面会给城市环境带来很多危害,其中最为典型的是造成了城市的“热岛效应”[1]。因此,开发应用一种适合于路面工程的透水混凝土显得尤为重要和紧迫。透水混凝土具有良好的透气性和透水性,可用于铺筑路面工程,对改善环境降低路面噪音和提高行车舒适性均具有良好的效果,属于一种环保型绿色的建筑材料,它能扩大城市的透水、透气面积,对调节城市空气的温度和湿度,维持地下土壤的
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