摘要
通过孔溶液分析和用扫描电子显微镜观察骨料表面的侵蚀情况,研究了矿物质粉体对碱硅酸反应的抑制机理。结果显示,在混凝土中掺入矿物质粉体,不仅可以降低孔溶液中的碱含量,且可以降低外部碱源的碱离子向混凝土内部的扩散以及降低内部孔溶液中的碱离子向骨料表面的扩散,从而降低对骨料的侵蚀作用,抑制碱硅酸反应的有害膨胀。
The mechanism of mineral admixtures on suppressing alkali-silica reaction has been studied through analyzing the pore solution and observing the surface of aggregates in mortar bars with scanning electron microscope （SEM）. The results show that when mineral admixtures are used in the concrete, not only the alkali concentration in the pore solution can be reduced, but also the diffusion of alkali ions from the outside of concrete to the inside can be prevented, and the diffusion of alkali ions from the pore solution to the surface of the aggregates can also be prevented. So the attack of alkalis to aggregates is reduced, and the alkali-silica reaction is suppressed.
出处
《工业建筑》
CSCD
北大核心
2005年第11期70-73,共4页
Industrial Construction
关键词
混凝土
碱硅酸反应
矿物质粉体
抑制机理
concrete
alkali-silica reaction （ASR）
mineral admixtures
suppressing mechanism
