1 College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China 2 College of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China 3 Suqian Huayi Concrete Co., Ltd., Suqian 223839, China
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.
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2020, Vol. 34 
