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Drying shrinkage behavior of hybrid alkali activated cement (HAAC) mortars
Highlights Slag-based HAAC mortar shows the highest drying shrinkage. The incorporation of fly ash could temper the magnitude of drying shrinkage. Steam curing could alleviate the drying shrinkage of HAAC mortar. The drying shrinkage for HAAC mortar is improved when a solid activator is used.
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.
Drying shrinkage behavior of hybrid alkali activated cement (HAAC) mortars
Highlights Slag-based HAAC mortar shows the highest drying shrinkage. The incorporation of fly ash could temper the magnitude of drying shrinkage. Steam curing could alleviate the drying shrinkage of HAAC mortar. The drying shrinkage for HAAC mortar is improved when a solid activator is used.
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.
Drying shrinkage behavior of hybrid alkali activated cement (HAAC) mortars
Xue, Lili (author) / Zhang, Zuhua (author) / Liu, Hongfei (author) / Jiang, Yuanhai (author) / Wang, Hao (author)
2021-12-07
Article (Journal)
Electronic Resource
English
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