Enhancing corrosion resistance of reinforcing steel in seawater-mixed mortar using biochar
文献类型：期刊论文
| 作者 | Ma, Qiangqiang3; Fan, Qi2; Fan, Liang2; Li, Zhipeng1; Sun, Congtao2; Zhang, Yongjun3; Hou, Baorong2 |
| 刊名 | JOURNAL OF BUILDING ENGINEERING
 |
| 出版日期 | 2026-02-01 |
| 卷号 | 119页码:18 |
| 关键词 | Sea water mortar Chloride ion Biochar Steel corrosion |
| DOI | 10.1016/j.jobe.2025.115171 |
| 通讯作者 | Fan, Liang(fanl@qdio.ac.cn) ; Sun, Congtao(suncongtao@qdio.ac.cn) |
| 英文摘要 | Seawater-sea-sand concrete faces the bottleneck issue of chloride-induced reinforcement corrosion. Although biochar modification improves mechanical properties and durability, its chemical binding efficiency in chloride-rich systems and pore regulation effects remain unclear. Specifically, whether these effects can reduce chloride ion concentration at the rebar-mortar interface to control electrochemical corrosion requires further investigation. This study prepared seawater mortar with different contents (0.5 %, 1 %, and 3 %) of sawdust and straw biochar, and systematically investigated the mechanisms of biochar's influence on rebar corrosion through chloride ion titration, porosity measurement, electrochemical tests (OCP, LPR, EIS), and SEM-EDS/FTIR characterization. The results showed that 0.5 % sawdust biochar, through pore structure optimization (porosity of 2.53 vol%) and chemical bonding ([Cl-]/[OH-] ratio of 4.07), significantly reduced free chloride ion concentration and achieved optimal corrosion inhibition (Rp = 4018 Omega cm2, OCP reduced by 37 %). However, excessive addition (>= 1 %) increased porosity (reaching 4.4 % at 3 % dosage) and enriched Cl-at the interface, leading to a negative shift in corrosion potential by 0.13 V and accelerating the de-passivation process. Microscopic characterization confirmed that biochar immobilized chloride ions through both chemical and physical adsorption via hydroxyl/carboxyl groups, increasing the average Cl enrichment by 72 % in the biochar region. Therefore, 0.5 % sawdust biochar significantly delays the corrosion initiation of rebar through synergistic chemical fixation and pore optimization, whereas excessive addition increases corrosion risk. This study provides a dosage basis for durable seawater-sea-sand concrete design. |
| WOS关键词 | CONCRETE |
| 资助项目 | Taishan Scholars Program ; Shandong Natural Science Foundation Youth Program[ZR2023QE015] ; Guangxi Science and Technology Program[Guike AA23026007] ; Shandong Excellent Youth Science Foundation Program[2023HWYQ-100] ; National Natural Science Foundation of China and China Railway[U2368209] |
| WOS研究方向 | Construction & Building Technology ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001666582500001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/204592]  |
| 专题 | 海洋研究所_海洋腐蚀与防护研究发展中心 |
| 通讯作者 | Fan, Liang; Sun, Congtao |
| 作者单位 | 1.CarbonSilvanus Co, Pullman, WA 99164 USA 2.Chinese Acad Sci, Inst Oceanol, Key Lab Adv Marine Mat, Qingdao 266071, Peoples R China 3.Qingdao Technol Univ, Sch Civil Engn, Oingdao 266520, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Qiangqiang,Fan, Qi,Fan, Liang,et al. Enhancing corrosion resistance of reinforcing steel in seawater-mixed mortar using biochar[J]. JOURNAL OF BUILDING ENGINEERING,2026,119:18. |
| APA | Ma, Qiangqiang.,Fan, Qi.,Fan, Liang.,Li, Zhipeng.,Sun, Congtao.,...&Hou, Baorong.(2026).Enhancing corrosion resistance of reinforcing steel in seawater-mixed mortar using biochar.JOURNAL OF BUILDING ENGINEERING,119,18. |
| MLA | Ma, Qiangqiang,et al."Enhancing corrosion resistance of reinforcing steel in seawater-mixed mortar using biochar".JOURNAL OF BUILDING ENGINEERING 119(2026):18. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。