Enhancing thixotropy and structural build-up of alkali-activated slag/fly ash pastes with nano clay

被引：32
作者：
Dai, Xiaodi [1 ]
Ren, Qiang [1 ,2 ]
Aydin, Serdar [1 ,3 ]
Yardimci, Mert Yucel [1 ,4 ]
Lesage, Karel [1 ]
De Schutter, Geert [1 ]
机构：
[1] Univ Ghent, Dept Struct Engn & Bldg Mat, Magnel Vandepitte Lab, Ghent, Belgium
[2] Tongji Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Civil Engn Mat, 4800 Caoan Rd, Shanghai 201804, Peoples R China
[3] Dokuz Eylul Univ, Dept Civil Engn, TR-35160 Izmir, Turkey
[4] Istanbul Okan Univ, Dept Civil Engn, TR-34959 Istanbul, Turkey
来源：
MATERIALS AND STRUCTURES | 2021年 / 54卷 / 04期
关键词：
Thixotropy; Ground blast-furnace slag; Fly ash; Nano clay; Structural build-up; STATIC YIELD-STRESS; CEMENTITIOUS MATERIALS; FRESH; RHEOLOGY; STRENGTH; TEMPERATURE; SUSPENSIONS;
D O I：
10.1617/s11527-021-01760-4
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigates the influence of nano clay on the rheological properties of alkali-activated cement pastes having different GGBFS/FA ratios. The thixotropic index, structural build-up, dynamic yield stress and heat evolution of fresh AAC pastes with addition of nano clay are studied. Test results showed that nano clay had a strong influence on the thixotropy/structural build-up and dynamic yield stress of AAC pastes depending on the GGBFS/FA ratio of the mixture. It was found that the pastes with lower GGBFS/FA ratio exhibited higher thixotropic index, but lower dynamic yield stress in the presence of nano clay. This study reveals the importance of GGBFS/FA ratio in the presence of nano clay for obtaining AAC mixtures with low dynamic yield stress for a better flowability and high thixotropy/structural build-up for stability.
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页数：17
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