Mechanistic evaluation of NO2 sequestered recycled concrete aggregates as anodic corrosion inhibitors in chloride-exposed OPC concrete: insights from kinetics and performance assessment

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-04-16 DOI:10.1617/s11527-025-02625-w

Shubham Mishra, Erandi Ariyachandra, Sulapha Peethamparan, Alexander Orlov

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Abstract

This study evaluates a novel corrosion inhibitor derived from NO₂ sequestered recycled concrete aggregates (NRCAs) integrated as fine aggregates in new OPC concrete exposed to chlorides. It investigates the corrosion resistance of concrete with various NRCAs and the kinetics of passive film formation on rebar to elucidate the corrosion inhibition mechanism. The performance of NRCAs is compared to a commercially available calcium nitrite-based inhibitor (CI). Results show NRCAs act as effective anodic corrosion inhibitors, with 1 and 2-year-old NRCAs demonstrating similar long-term performance to CI. Additionally, NRCAs facilitate rapid formation of thin passive films on rebar, akin to CI. The efficacy of NRCAs is influenced by the properties of the parent concrete. These findings underscore the potential of NRCAs as sustainable alternatives in concrete construction, offering both environmental benefits and comparable performance to conventional inhibitors. Future research will focus on optimizing NRCA properties to enhance their inhibitory effects.

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二氧化氮隔离再生混凝土骨料在氯化物暴露的OPC混凝土中作为阳极腐蚀抑制剂的机理评价：来自动力学和性能评估的见解

本研究评估了一种新型缓蚀剂，该缓蚀剂来源于NO2隔离再生混凝土骨料（NRCAs），该骨料作为细骨料集成在暴露于氯化物的新型OPC混凝土中。研究了不同NRCAs对混凝土的耐蚀性能及在钢筋表面形成钝化膜的动力学，以阐明其缓蚀机理。将NRCAs的性能与市售的亚硝酸钙基抑制剂（CI）进行了比较。结果表明，NRCAs是有效的阳极腐蚀抑制剂，1年和2年的NRCAs表现出与CI相似的长期性能。此外，nrca有助于在钢筋上快速形成钝化薄膜，类似于CI。nrca的效果受原混凝土性能的影响。这些发现强调了NRCAs作为混凝土施工中可持续替代品的潜力，它既具有环境效益，又具有与传统抑制剂相当的性能。未来的研究将集中于优化NRCA的性质，以增强其抑制作用。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.