受氯化物侵蚀的沿海碱渣土壤中海洋钢筋混凝土结构的使用寿命评估

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-16 DOI:10.1016/j.conbuildmat.2024.139222

Linjian Wu, Han Jiang, Xueli Ju, Mingwei Liu, Yutao Di, Yue Zhao, Zhouyu Xiang

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引用次数: 0

摘要

在氯盐环境中，氯离子侵入混凝土导致的钢筋腐蚀是钢筋混凝土结构（RCS）耐久性失效的主要原因。据测量，含水量较高的沿海苏打渣土（SRS）地基中的氯离子含量是海水的 2-3 倍，这严重威胁着在 SRS 环境中建造的钢筋混凝土结构（RCS）的耐久性。与海洋潮汐环境相比，高含水量和高氯离子含量的 SRS 腐蚀环境对氯离子迁移行为和海洋遥控卫星使用寿命的影响尚不清楚。因此，本文对氯离子侵入沿海 SRS 环境中的海工混凝土试件进行了室内实验研究。研究揭示了半埋区（SBZ）和全埋区（FBZ）的真实 SRS 环境以及 SRS 模拟盐溶液（SSS）环境中混凝土内氯离子的浓度分布和迁移特性。暴露在海洋潮汐区（MTZ）中的混凝土试件的氯离子迁移测量结果被用作对照组，以量化埋在沿岸 SRS 环境中的混凝土与埋在 MTZ（海洋潮汐区）中的混凝土在氯离子迁移行为上的差异。根据菲克第二扩散定律，建立了沿岸 SRS 和 MTZ（海洋潮汐区）环境中混凝土的氯化物迁移模型。以某海洋 RCS 为例，通过本文提出的氯离子迁移模型对该结构在沿海 SRS 和 MTZ（海洋潮汐区）环境中的使用寿命进行了评估和比较。结果表明，FBZ（全埋区）中的 RCS 预测使用寿命最长，其次是 MTZ（海洋潮汐区）中的 RCS，而 SBZ（半埋区）中的 RCS 预测使用寿命最短。FBZ（全埋区）和MTZ（海洋潮汐区）的海洋遥控卫星的使用寿命分别约为SBZ（半埋区）的1.37倍和2.76倍。

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Service life evaluation of marine reinforced concrete structures in coastal soda residue soil subjected to chloride attack

In chloride salt environments, the corrosion of steel reinforcements due to chloride ions intrusion into concrete is the main cause of the durability failure of reinforced concrete structures (RCSs). The chloride content included in coastal soda residue soil (SRS) foundations with a high moisture content has been measured to be 2–3 times that of seawater, which seriously threatens the durability of RCSs built in the SRS environment. Compared with marine tidal environments, the influence of SRS corrosive environment with a high moisture content and high chloride ions content on the chloride ions transport behaviours and the service life for the marine RCSs remains unclear. Therefore, for this paper, an indoor experimental study on chloride ions intrusion into the marine concrete specimens in a coastal SRS environment was carried out. The concentration profiles and transport characteristics of chloride ions within concrete in a real SRS environment with a semi-buried zone (SBZ) and a fully buried zone (FBZ) and in a simulated salt solution (SSS) environment of SRS were revealed. The measured results of chloride transport in concrete specimens exposed to the marine tidal zone (MTZ) were used as the control group to quantify the differences in chloride transport behaviours between concrete buried in the coastal SRS environment and that in the MTZ (marine tidal zone). Chloride transport models of concrete in coastal SRS and MTZ (marine tidal zone) environments were built by means of the Fick's second law of diffusion. Taking a certain marine RCS as an example, the service lives of this structure in coastal SRS and MTZ (marine tidal zone) environments were evaluated via this paper’s proposed chloride transport models and then compared. Results indicated that the predicted service life of the RCS in the FBZ (fully buried zone) is the longest, followed by that in the MTZ (marine tidal zone), and that in the SBZ (semi-buried zone) is the shortest. The service lives of the marine RCSs in the FBZ (fully buried zone) and MTZ (marine tidal zone) were approximately 1.37 times and 2.76 times that of the SBZ (semi-buried zone), respectively.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.