砂岩骨料的碱活性检测与抑制试验  

Tests of detection and inhibition of alkali aggregate reactivity for sandstone

作　　者：李北星[1] 胡晓曼[1] 文梓芸[2] 李双艳[3] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]华南理工大学材料科学与工程学院,广东广州510641 [3]中南勘测设计研究院,湖南长沙410014

出　　处：《武汉大学学报（工学版）》2006年第1期67-71,共5页Engineering Journal of Wuhan University

摘　　要：用岩相法、砂浆棒快速法、溶胶-凝胶膨胀法和混凝土棱柱体法,联合研究了砂岩骨料的碱硅酸反应(ASR)活性,评价了粉煤灰对该砂岩ASR膨胀的抑制效果.试验结果一致表明了该砂岩骨料具有潜在的ASR活性,其碱活性主要来自于玉髓状微晶石英和波状消光石英.采用20%的Ⅰ级粉煤灰替代水泥,可以把这种砂岩的ASR膨胀量控制在非碱活性范围之内.The alkali-silica reaction （ASR） of sandstone aggregate is determined by means of petrographic examination, mortars-bar test and sol-gel expansion test as well as concrete prism expansion method; and the effect of fly ash on inhibiting the ASR expansion occurred in the sandstone is evaluated. The experimental results congruously show that the sandstone aggregate is alkali-silica reactive, and the reactivity mainly results from chalcedonic microcrystalline quartz and undulated extinction quartz. The expansion value due to ASR for the sandstone can be reduced to a non-reactive range by substituting cement with 20% first grade fly ash.

关 键 词：砂岩骨料 碱活性 粉煤灰 抑制 

分 类 号：TU528.041[建筑科学—建筑技术科学]