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[1]沈家万,卢都友,许仲梓.细集料碱溶出对既有混凝土构件碱含量测定的影响[J].南京工业大学学报(自然科学版),2015,37(04):21-26.[doi:10.3969/j.issn.1671-7627.2015.04.005]
 SHEN Jiawan,LU Duyou,XU Zhongzi.Effects of the alkali release on fine aggregates for determining alkali contents in field concrete structures[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2015,37(04):21-26.[doi:10.3969/j.issn.1671-7627.2015.04.005]
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细集料碱溶出对既有混凝土构件碱含量测定的影响()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
37
期数:
2015年04期
页码:
21-26
栏目:
出版日期:
2015-07-09

文章信息/Info

Title:
Effects of the alkali release on fine aggregates for determining alkali contents in field concrete structures
文章编号:
1671-7627(2015)04-0021-06
作者:
沈家万卢都友许仲梓
南京工业大学 材料科学与工程学院,江苏 南京 210009
Author(s):
SHEN JiawanLU DuyouXU Zhongzi
College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China
关键词:
碱集料反应 细集料 酸溶法 热水浸出法 碱含量
Keywords:
alkali-aggregate reaction fine aggregate acid soluble method hot-water extraction method alkali content
分类号:
TU528.041
DOI:
10.3969/j.issn.1671-7627.2015.04.005
文献标志码:
A
摘要:
混凝土碱含量是诊断和预测混凝土碱集料反应(AAR)破坏的重要基础数据之一。为比较不同途径和方法获取混凝土碱含量数据的相关性,分别采用酸溶法和热水浸出法研究不同碱含量的实际混凝土构件芯样的总碱含量和水溶性碱含量,比较了计算碱含量与实测碱含量的相关性,并探讨了细集料对碱含量测定结果的影响。结果表明:针对实际混凝土构件芯样,配合比计算碱含量与测定碱含量没有明显的相关性,碱含量测试样品制备过程混入的细集料,以及细集料中的部分含碱矿物在测定过程中的碱溶出是最重要的干扰因素。因此,为高效和经济预防AAR,需要进一步系统研究混凝土配合比计算碱含量与实际测定碱含量的相关性,以及细集料中含碱矿物种类、含量等对测定结果影响的量化关系。
Abstract:
Alkali content of concrete was one of the fundamental data for the diagnosis and prognosis of alkali-aggregate reaction(AAR)in concrete.In order to explore the correlation between the alkali contents of concrete obtained by different ways and methods,the total alkalis and water soluble alkalis of the field concrete cores with different alkali contents calculated by mixing proportion were tested by acid soluble method and the hot-water extraction method,respectively.The correlation between the alkali contents acquired by mixing proportion and by actual measurement,and the influences of fine aggregates on testing alkali contents were discussed.Results show that,there was no significant correlation between the alkali contents obtained by mixing proportion calculation and actual measurement.The incorporation of part of fine aggregates into the samples during the sample preparation process,and the alkali release from the fine aggregates was the main contribution to this miscorrelation.Therefore,for avoiding the AAR risk effectively and economically,the correlation between calculated and tested alkali contents in concrete team needed to be further studied.The influence of the contents and types of alkali-bearing minerals in aggregates on alkali measurement also needs to be clarified.

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备注/Memo

备注/Memo:
收稿日期:2014-05-04
基金项目:国家自然科学基金(51472116)
作者简介:沈家万(1986—),男,安徽蚌埠人,硕士,主要研究方向为水泥混凝土耐久性; 卢都友(联系人),教授,E-mail:duyoulu@njtech.edu.cn; 许仲梓(联系人),教授,E-mail:zzxu@njtech.edu.cn.
引用本文:沈家万,卢都友,许仲梓.细集料碱溶出对既有混凝土构件碱含量测定的影响[J].南京工业大学学报:自然科学版,2015,37(4):21-26..
更新日期/Last Update: 2015-07-08