Assessment of carbonation and corrosion in a 50-year-old reinforced concrete building

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Lupesh Dudi, Shashank Bishnoi
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Abstract

This paper presents an investigation conducted on a 50-year-old structure in a composite climactic zone of India. The study comprises two parts, one covering the comparison of long-term natural and short-term accelerated carbonation while another revealing insight into the structure’s durability and potential concerns. Mineralogy, pore solution, and transport properties comparison of natural and accelerated carbonated concrete samples highlight similar modifications, demonstrating the representative nature of accelerated carbonation at 3% carbon dioxide concentration. However, accelerated carbonation led to the preferred precipitation of calcite and a higher degree of C–S–H carbonation. Core strength and carbonation depth measurements indicate that the carbonation coefficient shows a high variation within the structure due to micro-climatic conditions, and there is a need to consider carbon dioxide concentration greater than 400 ppm for residential buildings. Additional investigations based on half-cell potential, surface resistivity, and corrosion rate measurement highlighted that moisture availability is the main deterioration-controlling factor during the propagation phase. Also, it was realized that during an inspection, if different non-destructive measurements fall in the middle range, it becomes inconclusive to ascertain the severity of corrosion. In such situations, visual inspection of the reinforcement is imperative. Finally, the authors recommend collecting data on carbon dioxide concentration and the moisture state of different locations in the structure during structural inspection.

Abstract Image

评估一座有 50 年历史的钢筋混凝土建筑的碳化和腐蚀情况
本文介绍了对印度复合气候区一座 50 年历史的建筑物进行的调查。研究由两部分组成,一部分涉及长期自然碳化和短期加速碳化的比较,另一部分则揭示了该结构的耐久性和潜在问题。天然碳化和加速碳化混凝土样品的矿物学、孔隙溶液和传输特性比较显示出相似的变化,证明了在 3% 二氧化碳浓度下加速碳化的代表性。不过,加速碳化更倾向于析出方解石,C-S-H 碳化程度更高。岩心强度和碳化深度测量结果表明,由于微气候条件的影响,碳化系数在结构内部的变化很大,因此有必要考虑在住宅建筑中使用浓度大于 400 ppm 的二氧化碳。基于半电池电位、表面电阻率和腐蚀速率测量进行的其他调查突出表明,在传播阶段,湿度是控制劣化的主要因素。此外,在检查过程中,如果不同的非破坏性测量值处于中间范围,则无法确定腐蚀的严重程度。在这种情况下,必须对钢筋进行目视检查。最后,作者建议在结构检测过程中收集结构不同位置的二氧化碳浓度和湿度状态数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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