摘要
通对延长快速砂浆棒法(AMBT)浸泡龄期至3 a以上,对使用AMBT来检测胶材外加剂(包括矿物掺合料SCM和Li_2CO_3)抑制碱-硅酸反应(ASR)的有效性进行了研究,并分析了AMBT的水泥碱含量的影响、判定龄期和判定限值.结果表明,AMBT能适用于SCM的抑制有效性检测,但不能有效反映Li_2CO_3的抑制作用;14 d判定龄期能有效体现SCM抑制作用;ASTM C1567和《铁路混凝土工程施工质量验收标准》(TB 10424—2010)的判定限值是适用的,而《预防混凝土碱骨料反应技术规范》(GB/T 50733—2011)的判定限值过于严格;水泥碱含量不是AMBT的主要影响因素.因此,建议使用AMBT评价SCM对ASR的抑制作用,GB/T 50733—2011的判定结果不宜作为判定SCM抑制ASR无效的参考依据,AMBT无需控制水泥碱含量.
The application of accelerated mortar-bars test(AMBT)in detecting the efficacy of binder admixtures to control alkali-silica reaction(ASR)was studied,including supplementary cementitious materials(SCM)and Li 2CO 3,by prolonging the AMBT curing age to more than 3 years.And some factors in AMBT were analyzed,including the determination of curing age,the determination limits of mortar-bars expansions and the influences of initial alkali content in cement.The results show that,the true inhibiting effects on SCM against ASR can be reflected in AMBT,but the Li 2CO 3 s can not be reflected.The curing age at the 14th day in AMBT can determine the inhibiting efficacy of SCM.The limits of mortar-bar expansions in both ASTM C1567 and Standard for Constructional Quality Acceptance of Railway Concrete Engineering TB 10424-2010 are suitable for detecting the inhibiting effects of SCM against ASR,but the limits of mortar-bar expansions in Technical code for prevention of alkali-aggregate reaction in concrete GB/T 50733-2011 are overly rigorous.And the initial alkali content in cement is not the main factor to disturb the results of AMBT.Therefore,AMBT is recommended for evaluating the inhibiting effects of SCM on ASR.The invalid results of SCM determined by GB/T 50733-2011 can not be used as a reference for rejecting the mitigation of SCM on ASR and no need to adjust the initial alkali content of cement in AMBT.
作者
高鹏
余红发
文静
李颖
臧亚美
Gao Peng;Yu Hongfa;Wen Jing;Li Ying;Zang Yamei(Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;Department of Resources and Civil Engineering,Tibet University,Lhasa 850000,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第2期357-362,共6页
Journal of Southeast University：Natural Science Edition
基金
国家重点基础研究发展计划(973计划)资助项目(2015CB655102)
国家自然科学基金资助项目(51608512)
中国科学院西部之光基金资助项目(2014)
关键词
快速砂浆棒法
抑制碱硅酸反应
矿物掺合料
锂盐
规程评价
accelerated mortar-bars test
inhibition of alkali-silica reaction
supplementary cementitious materials
lithium-based admixture
procedure evaluation
