硫铝酸盐膨胀剂对水泥砂浆早期徐变与内部湿度的影响

doi:10.11896/cldb.23100111

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Abstract The addition of sulfoaluminate expansive additives (SEA) can reduce the shrinkage of cementitious materials, however, the effect of SEA on materials’ creep and internal relative humidity is still unclear, which is not conducive to the accurate crack assessment of concrete structures. This work conducted an experimental study on the early-age creep, internal humidity, and pore information of cement mortars with 0%, 4%, and 8% SEA, and a simulative analysis about the effects of porosity and pore size on the creep property based on a finite element model with randomly-distributed pores. The results show that the mortar creep changes inversely with the increasing SEA content, and the reduction effect of SEA on the creep property of mortar loaded at a later age is more significant. There can also be found an inverse variation of internal relative humidity with increasing SEA content. SEA addition can reduce the porosity of cement mortar and refine the pore size. A 1% increment in mortar porosity results in 4% rise of creep, while the refinement of pore size has a limited effect on reduction of creep. The effect of SEA addition on mortar’s creep reduction can be attributed to the decreases in calcium silicate hydrate, internal relative humidity, and porosity, as well as the refinement of pore size.

Key words： creep internal humidity sulfoaluminate expansive additive cement mortar pore structure finite element model with randomly distributed pores

Published: 25 February 2025 Online: 2025-02-18

CLC number:

TU528

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	Articles by authors
	SONG Guofeng
	ZHANG Shiwei
	LIU Jun
	LIU Jiankun
	LIANG Siming

Cite this article:

SONG Guofeng,ZHANG Shiwei,LIU Jun, et al. Effect of Sulfoaluminate Expansive Additives on Early-age Creep and Internal Relative Humidity of Cement Mortar[J]. Materials Reports, 2025, 39(4): 23100111-7.

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https://www.mater-rep.com/EN/10.11896/cldb.23100111 OR https://www.mater-rep.com/EN/Y2025/V39/I4/23100111

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