基于风积沙特性的固化剂组成设计及其固化机理研究

doi:10.11896/cldb.21110087

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Abstract The particles of aeolian sand are round, uniform and small, smooth surface, difficult to compact and it's weak cementation with curing agent, so it is difficult to cure and it's serious shrinkage. By studying the effects of slag size and admixing quantity of slag, modulus and alkali equivalent of alkali activator and SO₃ admixing quantity of curing agent on the strength and shrinkage of solidified aeolian sand, a special curing agent suitable for aeolian sand was developed, and its action mechanism was revealed by means of XRD, SEM, NMR and MIP. The results show that the strength of solidified aeolian sand can be significantly improved by adding ground slag, introducing alkali excitation system and increasing the admixing quantity of SO₃, and its drying shrinkage can be reduced. Compared with ordinary P.O42.5 water mud, the 28 d unconfined compressive strength can be increased by 73.8%, while the 28 d drying shrinkage strain decreased by 40.8%. The micro test results show that the curing mechanism of the special curing agent for aeolian sand is that the pores between aeolian sand are filled with ground slag powder to improve the pore structure of solidified aeolian sand and that the cement alkali excitation system is adopted to enhance the cementitious performance of curing agent and improves the interface between the curing agent and aeolian sand and that SO₃ is introduced to promote the formation of AFt crystal and fills the internal pores of solidified aeolian sand to compensate for shrinkage.

Key words： solidified aeolian sand sandy soil diameter alkali activated slag SO₃ admixing quantity

Published: 25 August 2022 Online: 2022-08-29

CLC number:

U414

Fund:National Key R & D Program of China(2020YFC1909903).

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	Articles by authors
	CHEN Xiao
	LU Yalei
	WANG Jiliang
	DU Xinyu

Cite this article:

CHEN Xiao,LU Yalei,WANG Jiliang, et al. Study on Composition Design and Curing Mechanism of Curing Agent Based on Characteristics of Aeolian Sand[J]. Materials Reports, 2022, 36(16): 21110087-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21110087 OR http://www.mater-rep.com/EN/Y2022/V36/I16/21110087

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