基于欧洲标准研究内部硫酸盐反应对混凝土体积

关键字：内部硫酸盐反应,体积稳定性,扫描电镜,钙矾石

（1.中建西部建设西南有限公司，四川 成都  610052；2.武汉理工大学硅酸盐材料国家重点实验室，湖北 武汉  430070）

    摘要：基于欧洲标准并采用残余膨胀试验和SEM测试方法，通过胶凝材料体系的组成差异，研究了内部硫酸盐反应对混凝土体积稳定性的影响并分析了其机理。结果表明：内部硫酸盐反应对混凝土体积稳定性存在影响，而胶凝体系中C3A越多，能与体系或渗入的硫酸盐反应生成AFt和AFm就越多，内部硫酸盐反应将更剧烈；AFt水化产物主要在混凝土孔隙中生成并生长；而AFm主要与CSH凝胶胶结生成；而内部硫酸盐反应使混凝土产生体积膨胀，主要是AFm转化为AFt时体积膨胀所致。
    关键词：内部硫酸盐反应；体积稳定性；扫描电镜；钙矾石
    中图分类号：TU528.01        文献标识码：A        文章编号：1001-702X（2017）06-0005-04

Based on European standard to study the effect of internal sulfate reaction on volume stability of concrete
XIANG Weiping1，2，LAN Cong1，CHEN Jing1，LIU Yunpeng2，WANG Fazhou2
（1.China West Construction Group Southwest Co. Ltd.，Chengdu 610052，China；
2.State Key Laboratory of Silicate Materials，Wuhan University of Technology，Wuhan 430070，China）

    Abstract：Based on European standard and the residual swelling test and SEM test method，through the composition difference of gelled material system，the influence of internal sulfate reaction on volume stability of concrete was studied and its mechanism was also analyzed. The results show that the internal sulfate reaction have influence on the stability of concrete volume，and the more C3A in the gel system，the more AFt and AFm can be generated，and its internal sulfate reaction more intense；AFt hydration products mainly generated in concrete pore and grew；and AFm main generated by bonding with CSH gel；while internal concrete sulfate reaction will produce volume expansion，which mainly caused by AFm expands when it is converted into the AFt.
    Key words：internal sulfate reaction，volume stability，SEM，AFt