Durability of Modified Asphalt-Based Grouting Material for Post-Tensioned Concrete Structures

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-25 DOI:10.1007/s12205-024-0308-0

Eryu Zhu, Honghe Jian, Yongzheng Zhou, Weibing Pan

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Abstract

This work proposes that a non-bleeding modified asphalt-based grouting material (AG) can be used to improve the durability performance of prestressed tendon (PT) in post-tensioned concrete structures (PTCS). Therefore, durable and mechanical properties of PTs are tested and compared to PTs coated by AG, AH70 matrix asphalt (AH), epoxy resin (ER), respectively. The combined effect of different coatings on diffusion coefficient, strength and ductility are highlighted. Results showed that AG recorded higher enhancing impermeability than ER and exceeded by 1–2 orders of magnitude compared with traditional CG. Compared with the PS and AH, ER and AG can slightly improved the strength of the strands and significantly enhance the ductility by 50% or more. A corrosion constitutive model for different coated strands is proposed, which features excellent applicability and accuracy. Finally, based on the linear weighted sum optimization method, the protective effect of AG has been discussed and validated. Satisfactory responses have been found AG is effective in enhancing the durability of prestressed strands.

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用于后张混凝土结构的改性沥青基灌浆材料的耐久性

本研究提出，无渗漏改性沥青基灌浆材料（AG）可用于改善后张法混凝土结构（PTCS）中预应力筋（PT）的耐久性能。因此，我们测试了预应力筋的耐久性能和机械性能，并分别与涂有 AG、AH70 基质沥青（AH）和环氧树脂（ER）的预应力筋进行了比较。不同涂层对扩散系数、强度和延展性的综合影响得到了强调。结果表明，AG 的增强抗渗性比 ER 高，比传统 CG 高出 1-2 个数量级。与 PS 和 AH 相比，ER 和 AG 能略微提高钢绞线的强度，并能显著提高 50%或更多的延展性。针对不同涂层钢绞线提出了一种腐蚀构成模型，该模型具有良好的适用性和准确性。最后，基于线性加权和优化方法，讨论并验证了 AG 的保护效果。结果令人满意，AG 能有效提高预应力钢绞线的耐久性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.