透水性铺装系统与大气间热水分传输过程实验方法及初期实验研究

Experimental Method and Initial Experimental Research on Permeable Pavement System and Heat Moisture Transmission Procedure in Atmosphere

城市透水性铺装材料与传统不透水性沥青路面相比具有良好的透水性能,并能随时间缓慢向附近局地大气蒸发散湿,达到改善城市热舒适环境的效果。本文首先针对实际城市交通透水性铺装系统制作了透水性铺装系统实验台,在实验台设计中创新提出了利用气体微压差变化量间接得到透水性铺装系统试样整体蒸发量变化的"差变单元"的实验方法,并利用此实验台在室外进行了典型透水性铺装系统与传统不透水性铺装系统内部各层热水分传输过程的对比实验,以研究和分析孔隙率大小对透水性铺装系统热水分传输效果的影响,进而归纳城市透水性沥青混凝土铺装系统对改善局地大气环境及地下水循环的优越性。

Compared with traditional impermeable bituminous pavement, urban permeable pavement materials have good permeability performances and can diffuse moisture through slow evaporation to nearby atmosphere, thus achieving the effect of improving thermal comfort environment in cities. In this paper, a test rig for permeable pavement system of urban transport was established,and an experimental method was innovatively brought forward that get indirectly ＂differential unit＂ of overall evaporation capacity variation of permeable pavement system samples through micro differential pressure variation of air during the design of test rig. And then, outdoor contrast experiments were carried out for heat moisture transmission procedure at respective layers inside typical permeable pavement system and traditional impermeable pavement system, so as to study and analyze the effect of porosity on heat moisture transmitting in permeable pavement system. Finally,the advantages of urban permeable bituminous concrete pavement system for improving partial atmosphere environment and underground water circulation were concluded.