Deterioration mechanism of coral reef sand concrete under scouring and abrasion environment and its performance modulation
文献类型：期刊论文
| 作者 | Qin, Qinglong1,3; Meng, Qingshan2; Gan, Manguang2; Ma, Zihan1,3; Zheng, Yong1,3 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2023-12-08 |
| 卷号 | 408页码:17 |
| 关键词 | Coral reef sand concrete Abrasion resistance Fly ash Silica fume C-S-H gel |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2023.133607 |
| 英文摘要 | In complex marine environment, coral reef sand concrete structures such as breakwaters are subjected to abrasion by sand-containing currents, which seriously shortens the service life and cycle of structures. Therefore, this paper investigates the health status of on-site breakwaters, moreover, reveals the damage mechanism of coral reef sand concrete (CRSC) under scour and abrasion environments in combination with indoor macroscopic and microscopic experiments. In addition, the effects of fly ash (FA) and silica fume (SF) on the mechanics and durability, hydration and hydration products of CRSC are investigated so that corresponding measures can be proposed to improve the service performance of breakwaters. The results demonstrate the indentation hardness of coral aggregate is greater than that of ITZ and cement stone matrix. Therefore, the ITZ and cement stone matrix with lower hardness are scoured and abraded by water flow containing coral reef blocks with high hardness, resulting in abrasion failure of CRSC. FA and SF prolong the induction period of cement, and reduce the hydration rate and accumulated heat of the accelerated period and second peak. The hydration reaction between the supplementary cementitious material and Ca(OH)2 occurred within 20-40 h, resulting in the third exothermic peak of the system. The hydration process of the admixture-cement system goes through three stages: crystallization nucleation and crystal growth (NG), phase boundary reaction (I) and diffusion (D). FA mainly plays a physical filling role in the early stage, and it reduces the early C-S-H polymerization degree and the total volume of C-S-H phase, but slightly increases C-S-H polymerization degree in later stage. However, SF is involved in hydration reaction in the early stage, and increases the C-S-H polymerization degree and total volume of C-S-H phase. |
| 资助项目 | National Natural Science Founda- tion of China[41877267] ; National Natural Science Founda- tion of China[41877260] ; Priority Research Program of the Chinese Academy of Science[XDA13010201] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[SKLGME021026] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001095460300001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39786]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Meng, Qingshan |
| 作者单位 | 1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Res Ctr Resources Engn Carbon Neutral, Hong Kong 999077, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Hong Kong Polytech Univ, Res Ctr Resources Engn Carbon Neutral, Hong Kong 999077, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qin, Qinglong,Meng, Qingshan,Gan, Manguang,et al. Deterioration mechanism of coral reef sand concrete under scouring and abrasion environment and its performance modulation[J]. CONSTRUCTION AND BUILDING MATERIALS,2023,408:17. |
| APA | Qin, Qinglong,Meng, Qingshan,Gan, Manguang,Ma, Zihan,&Zheng, Yong.(2023).Deterioration mechanism of coral reef sand concrete under scouring and abrasion environment and its performance modulation.CONSTRUCTION AND BUILDING MATERIALS,408,17. |
| MLA | Qin, Qinglong,et al."Deterioration mechanism of coral reef sand concrete under scouring and abrasion environment and its performance modulation".CONSTRUCTION AND BUILDING MATERIALS 408(2023):17. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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