活性MgO对碱矿渣水泥收缩性能的影响

doi:10.11896/cldb.21040175

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Abstract The effect of reactive MgO on the autogenous and drying shrinkage of NaOH and water glass activated slag cement was studied. The action mechanism of reactive MgO was revealed by hydration heat, XRD, TG/DTG and nitrogen sorption technologies. The results show that the addition of reactive MgO is not conducive to reducing the autogenous and drying shrinkage of NaOH activated slag, while an appropriate amount of reactive MgO can significantly reduce the autogenous and drying shrinkage of water glass activated slag. Reactive MgO greatly accelerates the hydration of NaOH activated slag, resulting in the increase of autogenous shrinkage. For water glass activated slag, the effect of reactive MgO on promoting hydration is weak and the autogenous shrinkage decreases. More hydration products, especially hydrotalcite, are formed by the action of reactive MgO, and also the crystallinity of C-(A)-S-H gel is improved, which is beneficial to inhibiting shrinkage. Due to the different hydration process between NaOH and water glass activated slag, the incorporation of reactive MgO causes changes in the pore structure and mesoporous volume of the hardened paste, which affects the development of autogenous and drying shrinkage.

Key words： alkali-activated slag (AAS) cement reactive MgO autogenous shrinkage drying shrinkage action mechanism

Published: Online: 2022-05-24

CLC number:

TU528

Fund:National Natural Science Foundation of China (52078420), the Natural Science Foundation of Shaanxi (2021JM-353), and the Research and Development Program of China State Construction Engineering Corporation (CSCEC-2021-Z-5).

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	Articles by authors
	ZHENG Weihao
	HE Juan
	WU Yonghua
	SONG Xuefeng
	SANG Guochen

Cite this article:

ZHENG Weihao,HE Juan,WU Yonghua, et al. Effect of Reactive MgO on the Shrinkage Property of Alkali-activated Slag Cement[J]. Materials Reports, 2022, 36(10): 21040175-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21040175 OR http://www.mater-rep.com/EN/Y2022/V36/I10/21040175

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