Drying shrinkage behavior of hybrid alkali activated cement (HAAC) mortars
Article
Article Title | Drying shrinkage behavior of hybrid alkali activated cement (HAAC) mortars |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Xue, Lili, Zhang, Zuhua, Liu, Hongfei, Jiang, Yuanhai and Wang, Hao |
Journal Title | Construction and Building Materials |
Journal Citation | 316, pp. 1-9 |
Article Number | 126068 |
Number of Pages | 9 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2021.126068 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0950061821038009 |
Abstract | Shrinkage is a vital factor for hybrid alkali activated cement (HAAC) related to durability. In this work, the drying shrinkage behavior of HAAC mortars with various precursors, curing regimes and activator states was investigated. Portland cement mortar and alkali activated cement (AAC) mortar were used as control groups. Results showed that the drying shrinkage magnitude of HAAC mortar is lower than that of AAC mortar but higher than that of Portland cement mortar. Slag-based HAAC mortar shows the largest shrinkage value and the introduction of fly ash could temper shrinkage slightly. The steam curing and solid activation could mitigate the magnitude of drying shrinkage for HAAC mortar. The drying shrinkage is irrespective of the water loss in this study. MIP, SEM, and XRD analyses were undertaken to gain more insights into the mechanisms of drying shrinkage of HAAC. More crystalline phase and higher Ca/Si gel of HAAC paste tempers the drying shrinkage of HAAC mortar. The larger capillary pores size is likely to explain the lower shrinkage of fly ash-based HAAC mortar. |
Keywords | Crystalline phase; Drying shrinkage; Hybrid alkali activated cement; Microstructures; Pore size distribution |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Funder | National Natural Science Foundation of China |
Byline Affiliations | Jiaxing University, China |
Centre for Future Materials | |
Hunan University, China |
https://research.usq.edu.au/item/xx0v8/drying-shrinkage-behavior-of-hybrid-alkali-activated-cement-haac-mortars
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