青藏地区集料碱硅酸反应的研究分析
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摘要
综述了碱集料反应的国内外研究动态和评定方法,并通过对比试验分析了掺加矿物掺合料和不掺矿物掺合料水泥砂浆的微观形貌和元素含量,以膨胀率长度为基础,采用SEM-EDS对养护56 d的试件进行了抑制机理分析。结果表明:矿物掺合料能够降低Na和K含量,使体系更加致密,并消耗了溶液中的碱含量,阻止碱和集料的进一步反应。
It reviews the AAR of domestic and foreign research and evaluation methods,and through the comparison of the experimental analysis of the content of mineral admixtures and mineral admixture micro morphology and element content of cement mortar,the expansion rate of length as the basis,using SEM-EDS of 56d curing specimens were inhibition mechanism analysis.The results show that mineral admixture can reduce the content of Na and K,make the system more dense,and consume the alkali content in the solution,and prevent further reaction of alkali and aggregate.
It reviews the AAR of domestic and foreign research and evaluation methods,and through the comparison of the experimental analysis of the content of mineral admixtures and mineral admixture micro morphology and element content of cement mortar,the expansion rate of length as the basis,using SEM-EDS of 56d curing specimens were inhibition mechanism analysis.The results show that mineral admixture can reduce the content of Na and K,make the system more dense,and consume the alkali content in the solution,and prevent further reaction of alkali and aggregate.
引文
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[2]FOURNIER B,BERUBE M A.Alkali-aggregate reaction in concrete:a review of basic concepts and engineering implications[J].Can J Civil Eng,2000,27(2):167-191.
[3]HURCOMB D R,VON FAY K F,ALBRIGHT D.Freezing and thawing and alkali-aggregate reaction weakens lightweight,structural concrete in North Dakota[J].Cement Concrete Aggr,2004,26(1):9-13.
[4]YURTDAS I,CHEN D,HU D W,et al.Influence of alkali silica reaction on mechanical properties of mortar[J].Construction and Building Materials,2013(47):165-174.
[5]卢都友.国际混凝土碱集料反应研究动态[J].混凝土,2009(1):57-61.
[6]谢永江,贾耀东,张勇,等.青藏铁路建设中混凝土的碱骨料反应问题[J].铁道科学与工程学报,2004,1(2):6-13.
[7]王素瑞,刘保国,金钦华.碱-骨料反应和干湿循环对混凝土的协同破坏效应研究[J].混凝土与水泥制品,2000,(4):15-17.
[8]Standard guide for petrographic examination of aggregates for concrete:ASTM C295-90[S].Annual book of ASTM standards,1992:179-186.
[9]Standard test method for potential reactivity of aggregates(chemical method):ASTM C289-87[S].Annual book of ASTM standards,1992:162-169.
[10]BERUBE M A,FOURNIER B.Canadian experience with testing for al-kali aggregate reaction reactivity in concrete[J].Cement Concrete and Composite,1993(15):27-47.
[11]张承志.集料碱活性的评定与混合材抑制碱集料反应膨胀有效性的评定[D].南京:南京化工大学,1996.
[12]许仲梓,沈洋,卢都友,等.硅质集料碱活性新检测方法主要参数[J].南京化工大学学报,1998,20(2):1-7.
[13]王威,刘连新,王勇生,等.硅粉抑制碱集料反应的试验研究[J].硅酸盐通报,2017,36(8):2787-2791.