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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
【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.
【Abstract】 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.
- 【文献出处】 武汉大学学报(工学版) ,Engineering Journal of Wuhan University , 编辑部邮箱 ,2006年01期
- 【分类号】TU528.041
- 【被引频次】5
- 【下载频次】222