防火涂料对高强混凝土高温后氯离子渗透性影响  

Influence of Fire Insulation on the Chloride Ion Permeability of High Strength Concrete after High Temperature

作　　者：吴波[1] 周鹏[1,2] 吴耀鹏[3] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]江西省电力设计院,江西南昌330096 [3]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《湖南大学学报（自然科学版）》2013年第1期9-14,共6页Journal of Hunan University:Natural Sciences

基　　金：国家杰出青年科学基金资助项目(51025829);国家重点基础研究发展计划(973计划)资助项目(2011CB013800);国家科技支撑计划子课题(2011BAJ09B03-04);亚热带建筑科学国家重点实验室基金资助项目(2011ZB07);中央高校基本科研业务费资助项目(2012ZP0011);陕西省百人计划资助项目(陕办发[2009]12号)

摘　　要：通过5组外包不同厚度防火涂料的C80高强混凝土试块的高温后氯离子渗透试验,研究了氯离子渗透性随涂料厚度的变化情况.试验结果表明:当防火涂料厚度≥30mm时,高温后氯离子渗透性基本不变;当防火涂料厚度为20～25mm时,高温后氯离子渗透性低于常温C50混凝土;当防火涂料厚度为15mm时,高温后氯离子渗透性相对较高.综合考虑后认为,厚度20mm的防火涂料可同时发挥抑制高强混凝土高温爆裂和降低高温后高强混凝土氯离子渗透性的双重作用.Five groups of high strength concrete （HSC） specimens with a 28-day cubic compressive strength of 82.6 MPa and with fire insulation were tested, and the influence of the thickness of fire insula- tion on the chloride ion permeability of HSC after high temperature was discussed. Test results have shown that, in the case that the fire insulation thickness is 30 mm, the chloride ion permeability of HSC after high temperature is almost the same as that at room temperature; in the case that the fire insulation thickness is 20~25 mm, the chloride ion permeability of HSC after high temperature is still lower than that of C50 concrete at room temperature; and in the case that the fire insulation thickness is 15 mm, the chloride ion permeability of HSC after high temperature is relatively large. It can be concluded that fire in- sulation with a thickness of 20 mm is effective both for the inhibition of explosive spalling of HSC at ele-vated temperature and for the reduction of the chloride ion permeability of HSC after high temperature.

关 键 词：高强混凝土 高温后 氯离子渗透性 改善措施 

分 类 号：TU528[建筑科学—建筑技术科学]