Sulphate Corrosion Mechanism of Ultra-High-Performance Concrete (UHPC) Prepared with Seawater and Sea Sand

doi:10.3390/polym14050971

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	Sulphate Corrosion Mechanism of Ultra-High-Performance Concrete (UHPC) Prepared with Seawater and Sea Sand
	Sun, Xin 4,5; Li, Tianyu 3; Shi, Fangying 2; Liu, Xiaoyan 3; Zong, Yingxia 1; Hou, Baorong 5; Tian, Huiwen 4,5
刊名	POLYMERS
	2022-03-01
卷号	14 期号:5 页码:21
关键词	sea sand polymer cement mortar UHPC sulphate corrosion material characterization X-CT
DOI	10.3390/polym14050971
通讯作者	Li, Tianyu(brhou@qdio.ac.cn) ; Hou, Baorong(brhou@qdio.ac.cn) ; Tian, Huiwen(tianhuiwen@qdio.ac.cn)
英文摘要	The lack of river sand is becoming increasingly serious. In this study, we consider how to use sea sand to prepare innovative construction and building materials with excellent mechanical and durability properties. Sulphate corrosion causes expansion, cracking and spalling of concrete, resulting in the reduction or even loss of concrete strength and cementation force. In this paper, artificial seawater, sea sand, industrial waste, steel fiber and polycarboxylate superplasticizer were used to prepare ultra-high-performance polymer cement mortar (SSUHPC), and the sulphate corrosion mechanism was investigated. The strength and cementation force of mortar on the SSUHPC surface decreased and flaked off with the development of sulphate erosion, and the steel fiber rusted and fell off. A 3D model was established based on X-ray computed tomography (X-CT), and the results showed that SSUHPC maintained excellent internal structural characteristics despite severe sulphate erosion on the surface. Mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were adopted to investigate the sulphate corrosion mechanism of SSUHPC. We found a transition zone within 1-5 mm of the surface of SSUHPC. The Vickers hardness of mortar in this area was increased by 5~15%, and the porosity was reduced to 3.8489%. Obvious structural damage did not occur in this area, but a high content of gypsum appeared. UHPC prepared with seawater sea sand was found to have better sulphate resistance than that prepared with freshwater river sand, which supports the development and utilization of sea sand in concrete.
资助项目	Shandong Key Laboratory of Corrosion Science, China ; National Natural Science Foundation of China[41827805] ; National Natural Science Foundation of China[51879093]
WOS研究方向	Polymer Science
语种	英语
出版者	MDPI
WOS记录号	WOS:000768475500001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/178236]
专题	海洋研究所_海洋腐蚀与防护研究发展中心
通讯作者	Li, Tianyu; Hou, Baorong; Tian, Huiwen
作者单位	1.Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266071, Peoples R China 2.Hohai Univ, Coll Environm, Nanjing 210098, Peoples R China 3.Hohai Univ, Coll Mech & Mat, Nanjing 210098, Peoples R China 4.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Sun, Xin,Li, Tianyu,Shi, Fangying,et al. Sulphate Corrosion Mechanism of Ultra-High-Performance Concrete (UHPC) Prepared with Seawater and Sea Sand[J]. POLYMERS,2022,14(5):21.
APA	Sun, Xin.,Li, Tianyu.,Shi, Fangying.,Liu, Xiaoyan.,Zong, Yingxia.,...&Tian, Huiwen.(2022).Sulphate Corrosion Mechanism of Ultra-High-Performance Concrete (UHPC) Prepared with Seawater and Sea Sand.POLYMERS,14(5),21.
MLA	Sun, Xin,et al."Sulphate Corrosion Mechanism of Ultra-High-Performance Concrete (UHPC) Prepared with Seawater and Sea Sand".POLYMERS 14.5(2022):21.