Journal
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
Volume 7, Issue 4, Pages 203-213Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/21650373.2018.1471424
Keywords
Alkali-activated fly ash/slag; drying shrinkage; pore structure; free water; weight loss
Categories
Funding
- National Natural Science Foundation of China [51561135012]
- State Key Laboratory of Silicate [SYSJJ2017-05]
- Program of Bureau of Education of Guangzhou Municipality [1201610460]
- Science and Technology Program of Guangzhou [2016B050501004]
- Pearl River S&T Nova Program of Guangzhou [201806010188]
- Australian Research Council [1006016]
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The drying shrinkage of alkali-activated fly ash/slag (AAFS) is an important engineering property for the control of cracking when AAFS is utilized as a building material. In this study, results of drying shrinkage of AAFS pastes with different fly ash content and activator concentrations were presented. The weight loss of samples during the drying process was monitored. The pore structure and free water content of AAFS pastes were measured. The results showed that AAFS pastes with 30 and 50 w. t.% fly ash content exhibited a lower drying shrinkage than alkali-activated slag, while the drying shrinkage of AAFS pastes with 70 w. t.% fly ash content was the largest among all the mixtures. Besides, AAFS pastes with higher activator concentration exhibited a higher drying shrinkage. But there were no clear correlations between weight loss, pore structure and the drying shrinkage. It was assumed that other factors affect the drying shrinkage of AAFS.
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