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Evolution of surface hardness of concrete under sulfate attack
Ouyang WY; Chen JK; Jiang MQ(蒋敏强); Chen, JK (reprint author), Ningbo Univ, Fac Mech Engn & Mech, Ningbo 315211, Zhejiang, Peoples R China.
Source PublicationConstruction and Building Materials
2014-02-28
Volume53Pages:419-424
ISSN0950-0618
AbstractUnder sulfate attack, the erosion damage is not uniformly distributed in concrete, but firstly takes place at the surface since the sulfate radical ions diffuse from surface to inner of the material. In order to investigate the damage degree, the variation of surface hardness of concrete was investigated in this study. The corrosion experiments continued about 330 days, and the evolution of surface hardness of concrete samples was detected by rebound method. Meanwhile, SEM observation and XRD test for concrete samples were also carried out. It was found that exist a competition mechanism of enhancement effect and weakening effect, because the surface hardness of concrete monotone increases at the initial stage. SEM observation and XRD test indicated that both enhancement and weakening effect are all caused by delayed ettringite and gypsum. The enhancement mechanism is produced by the filling effect of delayed ettringite and gypsum, and the weakening mechanism is induced by damage evolution due to their expansion force. Based on the experimental results, a new method was suggested to express the damage degree. The analysis results indicated that the water-to-cement ratio of concrete and the concentration of sulfate solution strongly affect the attenuation of the surface hardness. (C) 2013 Elsevier Ltd. All rights reserved.
KeywordDielectrophoresis Electroosmosis Joule Heating Microfluidics Reservoir
Subject AreaConstruction & Building Technology ; Engineering ; Materials Science
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000333506700044
Funding OrganizationThe authors would like to acknowledge the financial support by the National Natural Science Foundation of China (NSFC # 10932001, #51079069), the Key Research Program of Society Development of Ningbo (2013C51007), the Key Research Program of Ministry of Education of China (No. 20103305110001), and K.C. Wong Magna Fund in Ningbo University.
DepartmentLNM冲击动力学与新型材料力学性能
Classification一类
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Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48775
Collection非线性力学国家重点实验室
Corresponding AuthorChen, JK (reprint author), Ningbo Univ, Fac Mech Engn & Mech, Ningbo 315211, Zhejiang, Peoples R China.
Recommended Citation
GB/T 7714
Ouyang WY,Chen JK,Jiang MQ,et al. Evolution of surface hardness of concrete under sulfate attack[J]. Construction and Building Materials,2014,53:419-424
APA Ouyang WY,Chen JK,Jiang MQ,&Chen, JK .(2014).Evolution of surface hardness of concrete under sulfate attack.Construction and Building Materials,53,419-424.
MLA Ouyang WY,et al."Evolution of surface hardness of concrete under sulfate attack".Construction and Building Materials 53(2014):419-424.
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