LiF对水泥基材料性能的影响  

Effect of LiF on the Performance of Cement Based Materials

作　　者：莫祥银[1] 李钢[1] 唐明述[2] 

机构地区：[1]南京师范大学分析测试中心材料科学重点实验室,江苏南京210097 [2]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《材料科学与工程学报》2005年第1期120-123,共4页Journal of Materials Science and Engineering

基　　金：国家重大基础发展规划资助项目 (973项目 :2 0 1CD61 0 70 6) ;江苏省高校自然科学研究计划资助项目 (0 3KJB560 0 67) ;南京师范大学特聘教授;高层次人才科研启动基金资助项目(1 840 70H2B51 ) .

摘　　要：在 2 0℃长期养护条件下 ,当碱含量为 2 .5 %时 ,掺加Li Na摩尔比 0 .6的LiF能长期有效抑制碱集料反应膨胀。研究发现 :集料活性越高 ,LiF对膨胀抑制效果越好。对于沸石化珍珠岩砂浆 ,在有效抑制碱集料反应膨胀的前提下 ,随着Li Na摩尔比进一步的增加 ,LiF对碱集料反应膨胀的抑制效果并没有得到相应的提高。此外 ,掺加LiF一定程度上降低了砂浆的抗压强度和抗折强度 ,掺量越大 ,强度降低越多。在相同碱含量条件下 ,掺加LiF能缩短水泥的凝结时间 ,且Li Na摩尔比越大 ,凝结时间越短。At 20℃ curing condition, alkali aggregate reaction expansion could be long-term effectively inhibited by LiF at the alkali content of 2.5%. It is found that the higher the alkali reactivity of the aggregate was, the better the inhibiting effect of LiF showed. To the mortars with zeolitization perlite, when alkali aggregate reaction expansion was inhibited effectively, the effect of LiF on expansion was not raised obviously when the Li/Na molar ratio was increased at some extent. In addition, both the compressive strength and the flexural strength of the mortars would decrease when LiF was added. The more LiF was added, the more the strength would decrease. At the same alkali content conditions, the initial and final setting time of cement was shortened when LiF was added and the more Li/Na molar ratio of LiF was added, the more the setting time was cut down.

关 键 词：碱集料反应 锂盐 集料活性 碱含量 掺加量 

分 类 号：TU52[建筑科学—建筑技术科学]