单体材料对真实海洋环境潮汐区蒸汽养护混凝土抗氯化物侵蚀能力的影响

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Xiaofeng Han, Lixiao Zhao, Xiaoguang Sun, Li Tian, Zhenxing Du, Penggang Wang
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引用次数: 0

摘要

在实际工程中,蒸汽养护是一种广泛用于生产混凝土预制构件的技术。氯化物侵蚀是导致混凝土结构中钢筋锈蚀的主要因素,严重影响了海洋环境中混凝土结构的耐久性和安全性。本文采用 XRD、LF-NMR、29Si NMR 和 27Al NMR 对蒸汽养护混凝土和标准养护混凝土的微观结构演变进行了研究。然后,对蒸汽养护混凝土和标准养护混凝土进行了实际的海洋暴露试验,以探讨混凝土的微观结构演变和在潮汐区的氯离子侵蚀行为。结果表明,蒸汽养护可增加 C-(A)-S-H 的平均分子链长(MCL)和聚合度,促进硅氧四面体二聚体向聚合物的转化,并使蒸汽养护混凝土的 Q2/Q1 值增至标准养护混凝土的两倍。与标准养护试件相比,蒸汽养护混凝土试件的有害孔隙和多有害孔隙明显增多。随着暴露于海洋环境时间的增加,混凝土内部对流区的深度没有明显变化,但氯离子浓度的峰值逐渐增加。在蒸养混凝土中添加单体氯化物可降低游离氯化物和总氯化物的含量,这在显微测试中得到了很好的解释。蒸养混凝土表面的氯化物浓度和氯化物扩散系数与矿渣含量的增加呈二次函数关系,与粉煤灰含量呈指数衰减关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Effect of SCMs on the Resistance of Steam-cured Concrete to Chloride Attack in the Tidal Zone of Real Marine Environment

Steam curing is a widely used technique for producing precast concrete components in practical engineering. Chloride attack is a main factor that leads to the corrosion of rebars in concrete structures, which significantly affects the durability and safety of concrete structures in marine environments. In this paper, XRD, LF-NMR, 29Si NMR, and 27Al NMR were used to investigate the microstructure evolution of steam-cured concrete and standard-cured concrete. Then, the steam-cured and standard-cured concrete were subjected to actual marine exposure tests to explore the microstructure evolution of concrete and the chloride erosion behavior in the tidal zone. The results showed that steam-curing can increase the average molecular chain length (MCL) and polymerization degree of C-(A)-S-H, promote the transformation of silicon-oxygen tetrahedral dimer to polymer, and increase the Q2/Q1 value of steam-cured concrete to twice that of standard-cured concrete. Compared to standard-cured specimens, steam-cured concrete specimens had significantly more harmful pores and multi-harmful pores. With the increase of exposure time to the marine environment, the depth of the convection zone inside the concrete did not change significantly, however, the peak value of chloride concentration increased gradually. The addition of SCMs to steam-cured concrete reduced the content of free and total chloride, which was well explained by microscopic tests. The concentration of chloride on the surface and chloride diffusion coefficient of steam-cured concrete showed a quadratic function relationship with the increase of slag content, and an exponential decay relationship with the content of fly ash.

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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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