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Effect of Air Entrainment on the Mechanical Properties, Chloride Migration, and Microstructure of Ordinary Concrete and Fly Ash Concrete
Zhang, Peng1; Li, Dan1; Qiao, Yun1; Zhang, Sulei1; Sun, Congtao2; Zhao, Tiejun1
2018-10-01
Source PublicationJOURNAL OF MATERIALS IN CIVIL ENGINEERING
ISSN0899-1561
Volume30Issue:10Pages:9
Corresponding AuthorZhang, Peng(peng.zhang@qut.edu.cn)
AbstractAir-entrained concrete has been extensively used in bridges and water conservancy projects in cold regions. The objective of this study was to investigate the effect of air entrainment on the mechanical properties, chloride migration, and microstructure of ordinary concrete and fly ash concrete. Twelve concrete mixtures were prepared with two water-to-binder ratios (0.53 and 0.35), three levels of air content (no air entrainment; moderate air entrainment, with 4-5% air content; and high air entrainment, with 7-10% air content), and two levels of fly ash (no fly ash and 30% replacement of cement). The results indicated that, compared with ordinary concrete, the addition of an air-entraining agent (AEA) to fly ash concrete resulted in a greater decrease in compressive strength. Care must be taken when introducing artificial air bubbles into fly ash concrete because the bubbles will affect the mechanical properties. With proper air entrainment (air content of 4-5%), stable, closed, and well-distributed air bubbles are introduced into concrete so that the connectivity of the pore system is interrupted and chloride migration is consequently minimized. However, if the concrete contains a large amount of entrained air, a substantial amount of large and detrimental pores is introduced, causing air bubbles to overlap and merge, as well as causing additional chloride migration. This effect is more prominent in fly ash concrete.
KeywordAir entrainment Fly ash concrete Compressive strength Chloride migration Pore structure
DOI10.1061/(ASCE)MT.1943-5533.0002456
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51420105015] ; National Natural Science Foundation of China[U1706222] ; National Natural Science Foundation of China[51778309] ; 973 Program[2015CB655100] ; Natural Science Foundation of Shandong Province[ZR2018JL018] ; Natural Science Foundation of Shandong Province[ZR2017ZC073] ; 111 Project
WOS Research AreaConstruction & Building Technology ; Engineering ; Materials Science
WOS SubjectConstruction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS IDWOS:000440377200028
PublisherASCE-AMER SOC CIVIL ENGINEERS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/159726
Collection中国科学院海洋研究所
Corresponding AuthorZhang, Peng
Affiliation1.Qingdao Univ Technol, Dept Civil Engn, Fushun Rd 11, Qingdao 266033, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Peng,Li, Dan,Qiao, Yun,et al. Effect of Air Entrainment on the Mechanical Properties, Chloride Migration, and Microstructure of Ordinary Concrete and Fly Ash Concrete[J]. JOURNAL OF MATERIALS IN CIVIL ENGINEERING,2018,30(10):9.
APA Zhang, Peng,Li, Dan,Qiao, Yun,Zhang, Sulei,Sun, Congtao,&Zhao, Tiejun.(2018).Effect of Air Entrainment on the Mechanical Properties, Chloride Migration, and Microstructure of Ordinary Concrete and Fly Ash Concrete.JOURNAL OF MATERIALS IN CIVIL ENGINEERING,30(10),9.
MLA Zhang, Peng,et al."Effect of Air Entrainment on the Mechanical Properties, Chloride Migration, and Microstructure of Ordinary Concrete and Fly Ash Concrete".JOURNAL OF MATERIALS IN CIVIL ENGINEERING 30.10(2018):9.
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