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DOI	10.1016/j.conbuildmat.2020.121811
	Influence of low-temperature curing on the mechanical strength, hydration process, and microstructure of alkali-activated fly ash and ground granulated blast furnace slag mortar
	Wei, Xiaobin; Li, Dongqing; Ming, Feng; Yang, Chengsong; Chen, Lei; Liu, Yuhang
通讯作者	Wei, XB (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China. ; Wei, XB (通讯作者)，Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
发表日期	2021
ISSN	0950-0618
EISSN	1879-0526
卷号	269
英文摘要	Alkali activated concrete, a green building material with excellent mechanical properties and durability, is the most promising building material for use in the continuously increasing number of infrastructure construction projects in cold regions. However, at present, there are few studies evaluating the performance of alkali activated concrete cured in a low-temperature environment. In the present work, 50% fly ash (FA) and 50% ground granulated blast furnace slag (GGBFS) were used as composite cementitious materials to prepare four groups of alkali activated mortar samples, which were cured at -5 degrees C, 0 degrees C, 5 degrees C and 20 degrees C. The effects of low curing temperature (-5 degrees C, 0 degrees C, and 5 degrees C) on the mechanical properties, hydration process, hydration products, pore characteristics and microstructure of alkali activated FA and GGBFS (AAFG) mortar were investigated with uniaxial compressive strength tests, resistivity measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The results indicated that low-temperature curing reduced the compressive strength of the alkali activated mortar. The resistivity curves of the four groups of samples well reflected the influence of different curing temperatures on the early hydration process of the alkali activated binder. A low curing temperature delayed the hydration process and showed an obvious hysteresis effect. The lower the curing temperature was, the more significant the effect. The hydration reaction was not stopped when the sample was cured at -5 degrees C. Low curing temperatures did not change the type of hydration products but changed their amount. Low-temperature curing resulted in the formation of harmful pores. (C) 2020 Elsevier Ltd. All rights reserved.
关键词	ELECTRICAL-RESISTIVITY MEASUREMENT GEOPOLYMER CONCRETE CHLORIDE PERMEABILITY MERCURY POROSIMETRY PORE STRUCTURE CEMENT SUPERPLASTICIZER DURABILITY BEHAVIOR DESIGN
英文关键词	Alkali activated binder; Low curing temperature; Hydration process; Electrical resistivity; Microstructure; Pore characteristics
语种	英语
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS记录号	WOS:000604773000131
来源期刊	CONSTRUCTION AND BUILDING MATERIALS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254358
作者单位	[Wei, Xiaobin; Li, Dongqing; Ming, Feng; Yang, Chengsong; Chen, Lei; Liu, Yuhang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Wei, Xiaobin; Chen, Lei; Liu, Yuhang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wei, Xiaobin,Li, Dongqing,Ming, Feng,et al. Influence of low-temperature curing on the mechanical strength, hydration process, and microstructure of alkali-activated fly ash and ground granulated blast furnace slag mortar[J]. 中国科学院西北生态环境资源研究院,2021,269.
APA	Wei, Xiaobin,Li, Dongqing,Ming, Feng,Yang, Chengsong,Chen, Lei,&Liu, Yuhang.(2021).Influence of low-temperature curing on the mechanical strength, hydration process, and microstructure of alkali-activated fly ash and ground granulated blast furnace slag mortar.CONSTRUCTION AND BUILDING MATERIALS,269.
MLA	Wei, Xiaobin,et al."Influence of low-temperature curing on the mechanical strength, hydration process, and microstructure of alkali-activated fly ash and ground granulated blast furnace slag mortar".CONSTRUCTION AND BUILDING MATERIALS 269(2021).