硅酸盐学报

与钢筋脱钝化临界孔溶液pH值相关联的混凝土碳化理论模型

作者：刘志勇孙伟

单位：东南大学材料科学与工程学院东南大学材料科学与工程学院南京210096 烟台大学土木工程学院山东烟台264005 南京210096

关键词：可碳化物质混凝土孔溶液钢筋脱钝化临界pH值大掺量工业废渣混凝土含氯盐混凝土碳化模型

分类号：TU528

出版年,卷(期):页码：2007,35(7):899-903

DOI：

摘要：

通过分析混凝土可碳化物质来源,认为抗碳化能力的关键是在孔溶液中电离形成的OH-总量。讨论了混凝土碳化过程孔溶液碱度变化与孔溶液氢氧根离子形成过程的关系。在Papadakis碳化模型的基础上提出了与钢筋脱钝化临界孔溶液pH值相关联的可用于大掺量工业废渣混凝土及含氯盐混凝土改进的碳化理论模型。应用模型对3个水胶比(以质量计,下同)的普通混凝土和掺25%矿渣和25%粉煤灰混凝土的碳化值进行了理论计算,计算结果与加速碳化试验的结果比较分析表明:改进的碳化理论模型对于大掺量工业废渣混凝土具有相对好的准确性,同时分析表明该模型对于含氯盐混凝土也具有良好的适应性,从而为大气环境下掺工业废渣混凝土和含氯盐混凝土的耐久性设计和使用寿命预测提供了新的方法和途径。

Based on an analysis of the component source of carbonatable substance in concrete,the source of carbonatable substance in concrete essentially is the total quantity of hydroxyl ions ionized in pore solution.The relationship between the variation of the alkalinity of pore solution in the carbonation process and formation process of hydroxyl ions ionized in pore solution is discussed,and an improved concrete carbonation theoretical model is recommended.The proposed model is related to the critical pH value for steelbar depassivation of concrete pore solution based on the Papadakis carbonation model,which can be applicable to normal con-crete,concrete with high content industrial waste residue as well as concrete contaminated with chloride.The theoretical carbonation depths of normal concrete and concrete with 25% slag and 25% fly ash added with different mass ratios of water to binder were cal-culated using this model.Comparison of the results of the calculation data and experimental data indicate that the improved carbona-tion model not only has relatively good accuracy for concrete with high content industrial waste residue but also has better adaptability for concrete contaminated with chloride.So a new method for the durability design and service life prediction of concrete with high con-tent industrial waste residue and concrete contaminated with chloride in an atmospheric environment is provided.

基金项目：

国家自然科学基金(59938170)资助项目

作者简介：

参考文献：

[1]刘志勇,孙伟.多因素作用下混凝土碳化模型及使用寿命预测[J].混凝土,2003,170(1.2):3-7.LIU Zhiyong,SUN Wei.Concrete(in Chinese),2003,170(1.2):3-7. [2]张誉,蒋利学,张伟平,等.混凝土结构耐久性概论[M].上海:上海科技出版社,2003.43-68.ZHANG Yu,JIANG Lixue,ZHANG Weiping,et al.Durability of Concrete Structure(in Chinese).Shanghai:Shanghai Science&Tech-nology Press,2003.42-68. [3]PAPADAKIS V G,VAYENAS C G,FARDIS M N.Physical and chemical characteristics affecting the durability of concrete[J].ACI Mater J,1991,88(4):186-195. [4]PAPADAKIS V G,VAYENAS C G,FARDIS M N.Fundamental mod-eling and experimental investigation of concrete carbonation[J].ACI Mater J,1991,88(4):363-373. [5]PAPADAKIS V G,VAYENAS C G,FARDIS M N.Experimental in-vestigation and mathematical modeling of concrete carbonation[J].Chem Eng Sci,1991,46(5):1333-1338. [6]PAPADAKIS V G.Effect of supplementary cementing materials on concrete resistance against carbonation and chloride ingress[J].Cem Concr Res,2000,30(2):291-299. [7]黄士元,蒋家奋,杨南如,等.近代混凝土技术[M].西安:陕西科学技术出版社,1998.220-221.HUANG Shiyuan,JIANG Jiafen,YANG Nanru,et al.Modern Con-crete Technology(in Chinese).Xi’an:Shanxi Scientific and Techno-logic Press,1998.220-221. [8]杨南如.碱胶凝材料形成的物理化学基础(2)[J].硅酸盐学报,1996,24(4):460-463.YANG Nanru.J Chin Ceram Soc(in Chinese),1996,24(4):460-463. [9]LEA F M.水泥和混凝土化学[M].唐明述译.北京:中国建筑工业出版社,1980.139-141.LEA F M.Cement and Concrete Chemistry(in Chinese).TANG Mingshu transl.Beijing:China Architechture&Building Press,1980.139-141. [10]PAPADAKIS V G.Experimental investigation and theoretical modeling of silica fume activity in concrete[J].Cem Concr Res,1999,29(1.):79-86. [11]PAPADAKIS V G.Effect of fly ash on portland cement systems,part I:low-calcium fly ash[J].Cem Concr Res,1999,29(1.2):1727-1736. [12]PAPADAKIS V G.Effect of fly ash on portland cement systems,part II:high-calcium fly ash[J].Cem Concr Res,2000,30(1.1):1647-1654. [13]李东旭.矿渣水泥水化产物平衡体系的研究[J].材料导报,2001(1.):68-70.LI Dongxu.Mater Rev(in Chinese),2001(1.):68-70. [14]郑克仁,孙伟,贾艳涛,等.水泥矿渣粉煤灰体系中矿渣和粉煤灰反应程度测定方法[J].东南大学学报,2004,34(3):361-365.ZHENG Keren,SUN Wei,JIA Yantao,et al.J Southeast Univ(in Chi-nese),2004,34(3):361-365. [15]SUN Wei,LIU Zhiyong.Durability and service life prediction of concrete under coupling action of chloride penetration and carbonation in sea air[A].Proceedings of the Substructure Life’06International Workshop[C],Shanghai,2006.21-31.

服务与反馈：

【文章下载】【加入收藏】