RILEM AAR-5与其它快速法对集料ASR活性检测的对比与评价  

Applicability of RILEM AAR-5 Accelerated Test Method on Testing the Alkali-silica Reaction Reactivity of Siliceous Aggregates

作　　者：陈彦刚[1] 邓敏[1] 黄蓓[1] 

机构地区：[1]南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京210009

出　　处：《硅酸盐通报》2014年第10期2745-2751,共7页Bulletin of the Chinese Ceramic Society

摘　　要：试验采用RILEM AAR-5小混凝土柱法、ASTM C1260砂浆棒快速法、CECS48压蒸法和RILEM AAR-4加速混凝土棱柱体法检测了石门坎砂岩、两河口砂岩、锦屏砂岩、舟山安山岩和硅质白云岩的碱-硅酸反应活性,并将几种试验方法的结果进行比较,以评价RILEM AAR-5对硅质集料碱-硅酸反应活性检测的适应性。结果表明,对于慢性膨胀集料锦屏砂岩,RILEM AAR-5比ASTM C1260和CECS48检测更准确;硅质集料的小混凝土柱法（RELEM AAR-5）28 d膨胀率可以很好的预测混凝土棱柱体法试验结果;硅质集料尺寸与膨胀率的大致关系为RILEM AAR-5（5-10 mm,28 d）〉ASTM C1260（0.16-5 mm,14 d）〉CECS48（0.16-0.63 mm,6 h）;碱-硅酸反应除受活性组分（化学因素）影响外,活性组分在集料中的分布（构造特征）也有重要作用。The alkali-silica reactivity of sandstones,andesite and siliceous dolomite was evaluated by RILEM AAR-5 concrete microbars,ASTM C1260 accelerated mortar bars,CECS48 autoclaved mortar bars and RILEM AAR-4 concrete prisms. The expansions of the specimens were compared to evaluate the applicability of RILEM AAR-5 concrete microbars on testing the alkali-silica reactivity of siliceous aggregates. The results showed that RILEM AAR-5 was more accurate than ASTM C1260 and ECES48 in detecting the alkali-silica reactivity of chronic expanding aggregate（ Jin Ping sandstones）. The expansion results of concrete microbars at 28 d could predict the testing results of concrete prisms well. And the relationship between aggregates size and expansions was RILEM AAR-5（ 5-10 mm,28 d） ASTM C1260（ 0.16 -5 mm,14 d） CECS48（ 0.16-0.63 mm,6 h）. In addition to the content of reactivity component（ chemical factors） of aggregates,the distribution of reactivity component（ structural characteristics） may also have an important role on alkali-silica reaction.

关 键 词：碱-硅酸反应 砂浆棒 压蒸法 小混凝土柱 

分 类 号：TU528[建筑科学—建筑技术科学]