暴露于氯化物诱导腐蚀的碱活性混凝土使用寿命概率预测

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Tamara Janey Chidiac, Neven Ukrainczyk, Dale P. Prentice, John L. Provis
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引用次数: 0

摘要

在本研究中,对 fib Bulletin 34 中定义的行之有效的使用寿命设计规范进行了调整,以预测浸没在海洋条件下的碱活性混凝土中钢筋开始锈蚀的时间。该模型方法基于对从外部环境向钢筋迁移的氯离子临界浓度在钢筋表面积累并引发腐蚀反应所需时间的概率计算。定义模型参数所需的信息来自文献数据,这些数据与混凝土混合设计和实验室加速测试结果相关。研究结果表明,钙含量高的碱活性混凝土作为一种建筑材料,在富含氯化物的腐蚀环境中的结构应用中表现出良好的特性。该模型采用的概率方法提供了一个机会,可以评估矿物成分的变化和前体与碱性活化溶液的反应性的影响,这些都会影响粘结剂基体的化学演变和微观结构。预测的使用寿命对这些因素相当敏感,一些碱活化混凝土的预测使用寿命非常高,而其他混凝土的预测使用寿命则相当短,这一点必须纳入对未来材料性能的任何工程评估中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Probabilistic Service Life Prediction of Alkali Activated Concretes Exposed to Chloride Induced Corrosion

In this study, the well-established service life design code defined in fib Bulletin 34 is adapted to predict the time to initiation of reinforcement corrosion in alkali-activated concretes submerged in marine conditions. The model approach is based on the probabilistic calculation of the time needed for a critical concentration of chloride ions, migrating from the external environment towards the rebar, to accumulate at the surface of the steel reinforcement and initiate the corrosion reaction. The information required to define the parameters of the model is derived from literature data, relating the concrete mix designs with accelerated laboratory test results. The findings indicate that alkali-activated concretes with high calcium content can exhibit promising characteristics as a construction material applied for structural application in chloride-rich corrosive environments. The probabilistic approach adopted in this model provides the opportunity to assess the influence of variability in mineralogical composition and reactivity of the precursors with the alkaline activating solution, that influence the chemical evolution and microstructure of the binder matrix. The predicted service life is quite sensitive to these factors, with very high service lives predicted for some alkali-activated concretes but rather short service lives predicted for others, and this must be incorporated into any engineering assessment of future material performance.

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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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