石英砂岩碱骨料反应抑制措施的试验研究  

Experimental study on measures for inhibiting alkali-aggregate reaction of quartz sandstone

作　　者：李鹏翔[1,2] 王黎[1,2] 彭尚仕[1,2] 

机构地区：[1]长江科学院材料与结构研究所,湖北武汉430010 [2]水利部水工程安全与病害防治工程技术研究中心,湖北武汉430010

出　　处：《人民长江》2013年第7期75-78,共4页Yangtze River

摘　　要：石英砂岩中二氧化硅含量高,一般为硅质胶结,具有潜在危害性反应的碱活性。为弄清某工程所用石英砂岩骨料的碱骨料反应危害并寻求抑制措施,对石英砂岩骨料采用砂浆棒快速法、混凝土棱柱体法、砂浆长度法多种方法进行碱活性抑制有效性试验。试验结果表明,通过使用低碱水泥(含碱量小于0.60%)、掺加不小于30%的粉煤灰、控制混凝土总碱量后,可以有效抑制石英砂岩的碱骨料反应,确保工程混凝土的耐久性。The content of SiO2 in Quartz sandstone is high, and is usually in the form of silica cementing, which has the poten- tial of alkali - aggregate reaction. In order to study the danger of alkali - aggregate reaction of quartz sandstone aggregate adopted by a hydropower project and find the countermeasures, we conducted test on the inhibiting effectiveness of alkali - aggregate reac- tion of the quartz sandstone using accelerated mortar bar method, concrete prism method and mortar bar length method. The re- suits showed that by taking prevention measures such as adopting low - alkali cement（ alkali content less than 0.60% ） , adding to least 30% of fly ash and controlling the total alkali content of concrete strictly, the alkali - aggregate reaction of the quartz sand- stone can be effectively inhibited and the durability of the concrete can be guaranteed.

关 键 词：混凝土 石英砂岩 碱骨料反应 抑制试验 

分 类 号：TV43[水利工程—水工结构工程]