快速砂浆棒法对检测骨料碱活性的适用性评价  

Evaluation of the applicability of rapid mortar bar method for the determination of aggregate alkali activity

作　　者：高鹏 秦圆雨 薛刚 王永博 顾宇航 GAO Peng;QIN Yuanyu;XUE Gang;WANG Yongbo;GU Yuhang(Civil Engineering School,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2023年第1期98-102,共5页Journal of Inner Mongolia University of Science and Technology

基　　金：国家自然科学基金资助项目(51608512,51868063);中科院青年创新促进会资助项目(2019423);内蒙古自治区自然科学基金资助项目(2019MS05052).

摘　　要：使用15组骨料进行AMBT的延长试验.依据14 d膨胀率数据和AMBT判定准则,判定骨料碱活性.而后对比延长试验的后期膨胀率变化,对AMBT判定准则进行适用性评价.结果表明:14 d膨胀率判定准则不能有效体现中期和后期碱活性较强的骨料.最后提议,延长AMBT的观测时间至28 d,并结合其他试验方法,综合判定28 d膨胀率在0.1%~0.2%的未知碱活性骨料,提高碱活性判定的准确性.在盐湖或盐渍土地区,不宜单独使用AMBT,应采用多种试验方法对地下混凝土结构进行碱活性检测,防止中、后期碱活性骨料在高碱潮湿环境中带来的危害.In order to evaluate the applicability of accelerated mortar-bar test(AMBT)to the determination of aggregate alkali activity,15 groups of aggregate were used for AMBT extension test.The aggregate alkali activity was determined according to the 14 days’expansion rate data and the AMBT criterion.Then,the applicability of AMBT criterion was evaluated by comparing the change of expansion rate in the later period of the extended test.The results showed that the criterion of expansion rate of 14 days could not reflect the aggregate with strong alkali activity in the middle and late period.Finally,it is suggested that the observation time of AMBT should be extended to 28 d,and the unknown alkali activity aggregate with expansion rate of 0.1%-0.2%at 28 d should be comprehensively determined in combination with other test methods to improve the accuracy of alkali activity determination.In salt lake or saline soil area,AMBT should not be used alone,and various test methods should be used to detect the alkali activity of underground concrete structure,so as to prevent the harm of alkali active aggregate in high alkali and humidity environment in the middle and later period.

关 键 词：碱骨料反应 快速砂浆棒法 碱活性判定 判定准则评价 

分 类 号：TU528[建筑科学—建筑技术科学]