外保温系统的透气性对混凝土墙体中性化的影响  

Influence of the permeability of external thermal insulation on concrete wall carbonization

作　　者：薛文[1] 申雪寒 戴建国 金伟良[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]日本松本建工株式会社 [3]国土交通省港湾空港技术研究所

出　　处：《新型建筑材料》2009年第8期44-48,共5页New Building Materials

基　　金：国家"十一五"科技支撑计划项目(2006BAJ03A04)

摘　　要：对几种在日本应用较为广泛的外墙外保温系统的透气性及其对混凝土试件中性化的抑制作用进行测试,同时对采用外保温系统的实际钢筋混凝土建筑物外墙的中性化程度进行现场测试,结果显示,挤塑聚苯板外保温系统透气性很低,且采用注浆法施工时,该系统可有效地阻止混凝土中性化的发生。根据外保温系统透气性试验结果和8周中性化加速试验结果可以认为,当保温系统的透气系数大于10-4cm4(/N·s)时,该保温系统无法抑制混凝土的中性化。In this contribution, several kinds of external wall external thermal insulation systems which are being widely used in Japan are studied. Air permeability tests of these external thermal insulation systems and accelerated carbonization tests of concrete protected by them are performed. Based on the indoor and on-site carbonization testing results, the extruded polystyrene system has relatively lower permeability. When in combination with the grouting construction method, it can effectively prevent concrete from carbonization. It is concluded that when the air permeating coefficient of the external insulation system is larger than 10^-4 cm^4/（N· s）, it cannot prevent concrete from carbonization.

关 键 词：外保温系统 透气性 混凝土中性化 

分 类 号：TU111.4[建筑科学—建筑理论]