高镁镍渣-磷石膏基胶凝材料固化和改良盐渍土的性能

doi:10.11896/cldb.19040200

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Abstract In this work, industrial solid waste such as high magnesium nickel slag (HMNS) and phosphogypsum (PG) was used as the main cementitious material for the treatment of salted sludge, the salted sludge was treated by solidification and improvement at the same time. The physical and chemical properties of high magnesium nickel slag-phosphogypsum based cementitious materials for solidify and modify saline soil were evaluated, and the mechanism of solidification was analyzed. Finally, the feasibility of solidification and modification of saline soil by high magnesium nickel slag-phosphogypsum based cementitious material was verified by field test. The results showed that the road performance of solidified saline soil with HMNS-PG based cementitious material was better than that of traditional cement solidified soil. The water stability coefficients of the soil after 1 d, 3 d, 5 d and 7 d solidification with 20% HMNS-PG-based cementitious materials were 0.84, 0.81, 0.8 and 0.79, respectively. After 15 freeze-thaw cycles, the compressive strength loss rate and mass loss rate of the solidified body were 13.2% and 2.9%, respectively, and the integrity of the test piece was good. At the same time, the phosphogypsum improved the saline soil, so that the salt was precipitated, the soil particles were agglomerated, and the salt swelling and other diseases were reduced. After improving the saline soil with HMNS-PG-based cementitious material, the pH value of the saline soil decreased, the EC value of the conductivity of the leachate increased, and the sodium adsorption ratio (SAR) decreased. In the on-site curing test, the unconfined strengths of the two groups were 3.4 MPa and 2.8 MPa, the compaction degrees were 94.7% and 94.1%, respectively, and the conductivity of 240 d was increased by about 118.1%. The pH value fell by about 6.13%, the physical and chemical properties were obviously improved.

Key words： saline soil high magnesium nickel slag phosphogypsum solidification modification

Published: 27 April 2020

CLC number:

TQ172

Fund:This work was supported by the Jiangsu Province Social Development Project (SBE2017740749), Suqian City Social Development Project (S201708) and Jiangsu Provincial Department of Science and Technology Key Research and Development Program (Social Development) (BE2018697)

About author:: Lili Zhang, master student, studying at Nanjing University of Technology, is mainly engaged in research on comprehensive utilization of solid waste and soil solidification.
Sudong Hua, master’s tutor, associate professor, focusing on the utilization of inorganic solid waste resources (mainly industrial by-product gypsum, metallurgical waste, industrial sludge and oil field solid waste, etc.), soil solidified materials, oilfield chemical materials and new building materials.

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	ZHANG Lili
	HUA Sudong
	ZHU Huajun
	GU Zenghuan
	GU Zhong
	ZHAO Yihe

Cite this article:

ZHANG Lili,HUA Sudong,ZHU Huajun, et al. Properties of Solidified and Modified Saline Soil by High Magnesium Nickel Slag-Phosphogypsum Based Cementitious Materials[J]. Materials Reports, 2020, 34(9): 9034-9040.

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http://www.mater-rep.com/EN/10.11896/cldb.19040200 OR http://www.mater-rep.com/EN/Y2020/V34/I9/9034

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