摘要
采用5%纳米SiO_2改性砂浆作为保护层来提高混凝土的抗氯离子渗透性,与普通混凝土相比,经保护层处理的混凝土抗氯离子渗透性能得到了明显的改善。通过用差示扫描量热法-热重分析(DSC-TG)、X射线衍射(XRD)和扫描电子显微镜(SEM)等测试手段,探讨了纳米SiO_2改性的砂浆保护层对混凝土抗氯离子渗透性的影响机理。结果表明纳米SiO_2的异相晶核效应、高火山灰反应活性和微集料填充效应,共同作用提高了砂浆保护层的致密度,从而提高了混凝土的抗氯离子的渗透性能。
Compared with the concrete without modification coating,the chloride penetration resistance of modified concrete was significantly improved,especially in concrete applied with 5%nano-SiO2(NS)mortar coating.Then differential scanning calorimetry-thermogravimetric(DSC-TG),X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to explore the influence mechanism of nano-SiO2 modified cementitious coatings on the resistance against chlorine penetration of concrete.The analysis reveals that heterogeneous nucleus effect,high pozzolanic activity and micro-aggregate filling effect of NS have come together to improve density of mortar coating and then improve the ability of concrete to counter chloride diffusion.
作者
梅军帅
吴静
王罗新
李海南
梅军鹏
MEI Jun-shuai;WU Jing;WANG Luo-xin;LI Hai-nan;MEI Jun-peng(College of Materials Science and Engineering,Wuhan Textile University,Wuhan 430200,China;State Key Laboratory for Silicate Building Materials,Wuhan University of Technology,Wuhan 430070,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第12期3738-3743,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51302195)
湖北省重大专项研发计划(2018AAA001)
固废资源化利用与节能建材国家重点实验室开放基金(SWR-2016-002)。