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EFFECT OF ADMIXTURES ON THE PERFORMANCE OF CEMENT AND CONCRETE
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摘要: 在80℃长期养护条件下，当碱含量为25%时，掺加LiNa摩尔比06的Li2CO3能长期有效抑制碱集料反应膨胀。研究发现：集料活性越高，Li2CO3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，Li2CO3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Li2CO3一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Li2CO3能缩短水泥的凝结时间，且Li/Na摩尔比越大，凝结时间越短。Abstract: At 80 e curing condition, alkali aggregate reaction expansion could be long- term effectively inhibited by Li2CO3 at the alkali content of 21 5%. Also, the higher the alkali reactivity of the aggregate was, the better the inhibiting effect of Li2CO3 showed.To the mortars with Li2CO3 at the same Li/Na molar ratio, the inhibiting effect was raised when the alkali reactivity of the aggregate was increased. To the mortars with zeolitization perlite, if alkali aggregate reaction expansion was inhibited effectively, the effect of Li2CO3 on expansion was not raised correspondingly when the LiPNa molar ratio was further increased. In addition, both the compressive strength and the flexural strength of the mortars would decrease when Li2CO3 was added. The more Li2CO3 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 Li2CO3 was added and the higher the LiPNa molar ratio of Li2CO3 was, the shorter the setting time was.
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