低用水大掺量粉煤灰高性能砼的耐久性研究  

Durability of High Volume Fly Ash Concrete with Low Water Binder

作　　者：冯庆革[1] 杨义[1] 杨绿峰[1] 陈正[1] 朱惠英 

机构地区：[1]广西大学环境学院工程防灾与结构安全重点实验室,南宁530004 [2]广西建筑科学研究设计院,南宁530011

出　　处：《武汉理工大学学报》2009年第4期148-150,154,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50762001);教育部科学技术研究重点项目(206111);教育部留学回国基金(教外司留[2006]331);广西科学基金项目(桂科青0640010)

摘　　要：采用ASTM1202—97、GBJ82—85和压汞法研究了低用水量、低水胶比下,大掺量粉煤灰高性能混凝土的抗氯离子渗透性和抗碳化性能,结果表明,掺加粉煤灰的混凝土抗氯离子渗透性得到明显改善,适量的粉煤灰对水泥替代量对混凝土的抗碳化性能影响不大,粉煤灰掺量为30%混凝土的抗碳化性能最好,当混凝土中粉煤灰对水泥的取代量达到70%时,混凝土的抗碳化能力急剧下降;混凝土中Ca(OH)2的明显减少,生成更多的C-S-H凝胶和含铝(铁)水化物以及孔隙细化是混凝土抗氯离子渗透性和抗碳化性能得到改善的根本原因。The resistance to the penetration of chloride ions and the carbonation performance of high volume fly ash concrete with low water binder were conducted by ASTM 1202--97, GBJ82--85 and MIP. The results show that with the cement replacement by fly ash, it is effective in improving the resistance to the penetration of chloride ions of concrete; and it is not obvious effective on the resistance to the carbonation performance of concrete with small than 50% cement replacement by fly ash. The improvement of resistance to the penetration of chloride ions and the carbonation performance of high volume fly ash concrete mainly attribute to the less Ca（OH）2, more hydration products and the increasing of small pore of fly ash concrete.

关 键 词：粉煤灰 混凝土 低用水量 氯离子渗透性 抗碳化性能 

分 类 号：TU528.31[建筑科学—建筑技术科学]