RILEM TC 281-CCC 报告:对确定混凝土抗碳化性的标准化测试方法的严格审查

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Susan A. Bernal, Yuvaraj Dhandapani, Yogarajah Elakneswaran, Gregor J. G. Gluth, Elke Gruyaert, Maria C. G. Juenger, Barbara Lothenbach, Kolawole A. Olonade, Marlene Sakoparnig, Zhenguo Shi, Charlotte Thiel, Phillip Van den Heede, Hanne Vanoutrive, Stefanie von Greve-Dierfeld, Nele De Belie, John L. Provis
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引用次数: 0

摘要

二氧化碳与掺入的波特兰水泥混凝土之间的化学反应称为碳化,会导致性能降低,尤其是当混凝土暴露在二氧化碳浓度较高的环境中时(即加速碳化条件)。当混凝土拌合物设计或测试条件稍有改变时,经常会出现相互矛盾的碳化结果。RILEM TC 281-CCC "添加水泥基材料的混凝土碳化 "对不同地区目前用于确定混凝土抗碳化性的标准化测试方法进行了批判性分析。目前至少有 17 种不同的标准或建议被积极用于此目的,在样品养护、预处理、碳化暴露条件以及暴露后碳化深度的测定方法方面存在显著差异。这些差异对记录的碳化深度和计算的碳化系数值有很大影响。考虑到准确测定混凝土碳化潜力的重要性,这不仅是为了预测混凝土的耐久性能,也是为了确定混凝土在使用寿命期间或之后可重新吸收的二氧化碳量,因此必须认识到不同测试结果的适用性和局限性。这将使研究人员和从业人员能够根据测试结论的目的(如材料选择、使用寿命预测、二氧化碳捕获潜力),采用最合适的测试方法来评估抗碳化能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Report of RILEM TC 281-CCC: A critical review of the standardised testing methods to determine carbonation resistance of concrete

Report of RILEM TC 281-CCC: A critical review of the standardised testing methods to determine carbonation resistance of concrete

The chemical reaction between CO2 and a blended Portland cement concrete, referred to as carbonation, can lead to reduced performance, particularly when concrete is exposed to elevated levels of CO2 (i.e., accelerated carbonation conditions). When slight changes in concrete mix designs or testing conditions are adopted, conflicting carbonation results are often reported. The RILEM TC 281-CCC ‘Carbonation of Concrete with Supplementary Cementitious Materials’ has conducted a critical analysis of the standardised testing methodologies that are currently applied to determine carbonation resistance of concrete in different regions. There are at least 17 different standards or recommendations being actively used for this purpose, with significant differences in sample curing, pre-conditioning, carbonation exposure conditions, and methods used for determination of carbonation depth after exposure. These differences strongly influence the carbonation depths recorded and the carbonation coefficient values calculated. Considering the importance of accurately determining carbonation potential of concrete, not just for predicting their durability performance, but also for determining the amount of CO2 that concrete can re-absorb during or after its service life, it is imperative to recognise the applicability and limitations of the results obtained from different tests. This will enable researchers and practitioners to adopt the most appropriate testing methodologies to evaluate carbonation resistance, depending on the purpose of the conclusions derived from such testing (e. g. materials selection, service life prediction, CO2 capture potential).

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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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