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中文摘要：
本文研究了38℃下LiNO3对石英玻璃在NaOH溶液中碱硅酸反应（ASR）的影响，采用等离子发射光谱仪（ICP）、酸化处理、X射线衍射仪（XRD）和扫描电镜（SEM）对溶液中的离子浓度、SiO2分布、固相产物的组成和微观形貌进行分析和表征。测定了长龄期在38℃湿气养护下LiNO3对沸石化珍珠岩和防城港砂岩混凝土微柱中ASR膨胀的作用效果。结果表明：掺LiNO3的碱溶液中，Li^＋先于Na^＋与溶出的SiO2反应，生成低溶解性的含锂产物，并附着在石英玻璃表面，降低了溶液中OH^-对石英玻璃的溶蚀，进而减缓了ASR的反应速率。混凝土试件中[Li]／[Na＋K]摩尔比越高，LiNO。抑制ASR膨胀效果越好；随着龄期的延长，后期掺锂试件仍存在ASR膨胀。短龄期下LiNO3抑制活性集料的ASR膨胀效果良好，长龄期作用效果减弱。
英文摘要：
Alkali-silica reaction （ASR） processes of quartz without LiNO3 at 38℃ was investigated. Ions concentrations, glass soaked in NaOH solutions with or silicate types, phase compositions and microstructures of the reaction products at different ages were tested and analyzed by inductively coupled plasma, acidification method, X-ray diffraction and scanning electron microscope, respectively. In order to verify the long-term effectiveness of LiNOa on mitigating ASR expansion, lengths of concrete micro-bars containing alkali silica reactive aggregates and different LiNO3 dosages were evaluated in moist air at 38℃. Results showed that, Li＋ reacted with dissolved SiO4- prior to Na＋ in NaOH solution doped with LiNO3. Li- containing insoluble products, formed which covered the surface of quartz glass, resistance to further attack by OH-ions, effectively mitigated thereaction rate of ASR. For concrete micro-bars doped with LiNOa, the greater inhibition was caused with increasing molar ratio of [Li]/[Na＋K]. However, ASR might still proceed or cause further expansion in a longer time. Accordingly, effects that LiNOa inhibits ASR expansion are good only in a short time, but may be invalidated after long term.
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