Effect of Ca/Si ratio on the characteristics of alkali-activated ultra-high performance concrete (A-UHPC): From hydration kinetics to microscopic structure development

被引：43
作者：
Fan, M. X. [1 ]
Chen, F. X. [1 ,2 ]
Zhang, X. Y. [1 ]
Wang, R. K. [3 ]
Yu, R. [1 ,3 ,4 ,5 ]
机构：
[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[2] CCCC Second Harbour Engn Co Ltd, Wuhan 430040, Peoples R China
[3] Wuhan Univ Technol, Int Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
[4] Guangxi Univ, Guangxi Key Lab Disaster Prevent & Engn Safety, Nanning 530004, Peoples R China
[5] Wuhan Univ Technol, Adv Engn Technol Res Inst Zhongshan City, Xiangxing Rd 6, Zhongshan 528400, Guangdong, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 394卷
基金：
中国国家自然科学基金;
关键词：
Alkali activated ultra -high performance con; crete(A-UHPC); Ca; Si ratio; Silica fume; Low carbon; Sustainable development; S-H GELS; SILICA FUME; FLY-ASH; CEMENTITIOUS MATERIALS; SLAG; FRESH; RESISTANCE; EMISSIONS; ALUMINUM; BINDERS;
D O I：
10.1016/j.conbuildmat.2023.132158
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Ultra-high performance concrete (UHPC) produces higher carbon emissions than ordinary concrete. To achieve sustainable development of UHPC, this article explores the use of alkali-activated technology to create a lowcarbon UHPC, in which the effect of different Ca/Si ratios (from 0.7 to 1.5) on the performance of alkaliactivated UHPC (A-UHPC) is detailed analyzed. The obtained results show that with an increase of Ca/Si ratio, the properties of A-UHPC firstly increases and then gradually decreases. When the Ca/Si ratio is 1.2, the performance of the developed A-UHPC can be optimized, such as the 28-day compressive strength is 121.3 MPa, the relative content of C-(A)-S-H gel is 99.38%, the main chain length is 14.27, and the porosity is 4.28%. In general, this study can provide guidance for the formulation design and production of a new low carbon construction material in the future.
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页数：16
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