Bound chloride ingress in alkali activated concrete

被引：28

作者：

Mangat, P. S. ^{[1
]}

Ojedokun, Olalekan O. ^{[1
]}

机构：

[1] Sheffield Hallam Univ, Ctr Infrastruct Management, Mat & Engn Res Inst, Sheffield S1 1WB, S Yorkshire, England

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 212卷

基金：

英国工程与自然科学研究理事会; “创新英国”项目;

关键词：

Alkali activated cementitious material; AACM; Water soluble chloride; Acid soluble chloride; Bound chloride; Surface chloride concentration; Chloride diffusion coefficients; Chloride prediction models; REINFORCEMENT CORROSION; DIFFUSION-COEFFICIENT; PREDICTION; RESISTANCE;

D O I：

10.1016/j.conbuildmat.2019.03.302

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Alkali activated cementitious material (AACM) concrete and conventional concrete specimens of similar strength, developed for structural applications, were exposed to a 5% NaCl solution. Bound chloride concentrations (water and acid soluble) were determined up to 270 days of chloride exposure. Chloride diffusion profiles with depth and diffusion parameters C-0 and D-c were derived from the data for water soluble, acid soluble and total bound chloride concentrations in order to develop long term chloride prediction relationships. The results show that the practice of using acid soluble chloride data for long term chloride predictions in conventional concrete is not valid for AACMs due to their low chemical binding capacity. Instead the physically bound chloride (water soluble) is more predominant in AACMs and is suitable for the chloride prediction models. Therefore, relationships of chloride diffusion parameters C-0 and D-c, with time have been derived for water soluble chloride. These correlate with total bound chlorides and are suitable for long term predictions of chloride concentrations for the design and maintenance of AACM concrete structures against corrosion. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：375 / 387

页数：13

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