Ion Evolution in Pore Solution of Alkali-activated Slag System and Its Effect on Passivation Behaviour of Steel Bars

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Zhantao Du, Zuquan Jin, Bo Pang, Shicai Li, Chencui Wang
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Abstract

The passivation of steel bars in concrete is determined by the characteristics of the concrete pore solution. However, ion evolution in the pore solution of alkali-activated slag/limestone powder (AAS/L) systems is not yet well known. Therefore, in this study, ion evolution in real and simulated pore solutions of alkali-activated slag/limestone powder mortars is investigated using high-pressure and solid-liquid extraction methods. The study focuses on investigating the passivation behaviour of steel bars when exposed to the simulated pore solution. The results demonstrate that the contents of Ca, Na, Al, Si, and S2O32- first increase and then decrease with time, whereas the contents of K and SO42- consistently increase. Among the simulated pore solutions, the one with a solid-liquid ratio of 1 : 1 and an age of 14 days closely resembles the actual pore solution. In addition, the presence of a high S content resulting from the dissolution of S in the slag inhibits the passivation process of the steel bars in the simulated pore solution of AAS. However, the passivation film of the steel bars formed in the simulated AASL pore solution is strengthened by the addition of the limestone powder.

碱激活炉渣体系孔隙溶液中的离子演化及其对钢棒钝化行为的影响
混凝土中钢筋的钝化取决于混凝土孔隙溶液的特性。然而,碱活性矿渣/石灰石粉(AAS/L)体系孔隙溶液中的离子演变情况尚不十分清楚。因此,本研究采用高压和固液萃取方法研究了碱激活矿渣/石灰石粉砂浆实际和模拟孔隙溶液中的离子演变。研究重点是调查钢筋暴露在模拟孔隙溶液中的钝化行为。结果表明,随着时间的推移,Ca、Na、Al、Si 和 S2O32- 的含量先增加后减少,而 K 和 SO42- 的含量则持续增加。在模拟孔隙溶液中,固液比为 1 : 1、龄期为 14 天的模拟孔隙溶液与实际孔隙溶液非常相似。此外,炉渣中 S 的溶解导致 S 含量较高,这抑制了 AAS 模拟孔隙溶液中钢筋的钝化过程。然而,在模拟 AASL 孔隙溶液中形成的钢筋钝化膜却因石灰石粉的加入而得到加强。
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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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