摘要
简要评述了迄今碱－硅酸反应机理研究的进展。在二氧化硅化学的基础上阐述了反应的四个阶段以及导致膨胀的力的来源。Ｃａ（ＯＨ）＿２的作用是提供钙离子作为溶胶转化为凝胶的凝固剂；它的存在使部份凝胶直接在ＳｉＯ＿２矿物表面附近生成“反应环”。凝胶的膨胀性能不仅与其化学组成有关，而且与其结构有关。碱－硅酸反应液相产物对水泥水化产物有显著腐蚀作用，其作用大小与液相的化学组成相关联。
The development of research on ASR mechanisms so far is reviewed. Based on silica chemistry,thefour-stage reaction evolution as well as the sources of expansion are discussed. The role of Ca(OH)_2 in ASR canbe attributed to its agglomerant action in the aggregation process of alkali-silicate sols as it offers ion Ca￣(2+) slow-ly, which leads part of the gel to form a “reaction rim”in the vicinity of the reactive silica grains. The expansionproperty of gels is not only related to their chemical composition but also to their structure. The liquid-phaseproducts of ASR appear to have an obvious corrosion on cement hydrates,e. g. portlandite, in different levelsdepending on their chemical composition.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1994年第6期596-603,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
水化产物
混凝土
碱
硅酸
集料反应
alkali-aggregate reaction, mechanisms of reaction and expansion,role of calcium hydroxide,cor-rosion
