天然火山灰质材料对骨料碱活性的抑制研究  

Research on inhibition of alkali aggregate reactivity with natural pozzolans

作　　者：董芸[1,2] 杨华全[2] 李鹏翔[2] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072 [2]长江水利委员会长江科学院,湖北武汉430010

出　　处：《混凝土》2011年第11期77-79,共3页Concrete

基　　金：水利部公益性行业科研专项经费项目(20091066);科研业务费项目(CKSF2010013)

摘　　要：用岩相法、砂浆长度法、砂浆棒快速法和混凝土棱柱体法检验了某工程砂岩骨料的碱活性,并采用砂浆棒快速法研究不同品种天然火山灰质材料对该砂岩ASR膨胀的抑制效果。试验结果表明该砂岩骨料具有潜在的ASR活性,不同品种天然火山灰质材料对骨料ASR抑制效果差异较大,抑制效果最差的为玄武岩微粉,掺量在40%以上才能把这种砂岩的ASR膨胀量控制在非碱活性范围之内;抑制效果最好的是浮石微粉,掺量20%就有明显的抑制效果,与I级粉煤灰的抑制效果相当。The alkali reactivity of sandstone aggregate of a hydropower station engineering is determined by means of petrographic analysis,accelerate mortars-bar test and mortar length method as well as concrete prism expansion method.The effect of natural pozzalans on inhibition of the expansion is evaluated by the method of mortars-bar test.The experimental results show that the sandstone aggregate has potential alkali-silica reaction（ASR）activity.The basalt powder has the worst restrain effect and the mortar expansion due to ASR could be reduced to a non-reactive range by substituting cement more than 40% powder.The pumice powder has the best effect,and there is the obvious restrain effect with adding 20% pumice powder which is equivalent to the inhibition effect of first grade fly ash.

关 键 词：天然火山灰 粉煤灰 骨料 碱活性 抑制 

分 类 号：TU528.041[建筑科学—建筑技术科学]