Open Access

ARTICLE

Development and Field Application of Phosphogypsum-Based Soil Subgrade Stabilizers

Hongfei Yue¹, Aiguo Fang², Sudong Hua^1,*, Zenghuan Gu³, Yu Jia¹, Cheng Yang⁴

1 College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211800, China
2 China Construction Installaction Engineering Co., Ltd., Nanjing, 210023, China
3 Jiangsu Subote New Material Co., Ltd., Nanjing, 211103, China
4 Sinoma Construction Co., Ltd., Suzhou, 215300, China

* Corresponding Author: Sudong Hua. Email:

(This article belongs to the Special Issue: Renewable Foam Materials and Composites)

Journal of Renewable Materials 2022, 10(8), 2247-2261. https://doi.org/10.32604/jrm.2022.018901

Received 23 August 2021; Accepted 11 October 2021; Issue published 25 April 2022

Abstract

A phosphogypsum-based subgrade stabilizer (PBSS) was formulated using industrial by-product phosphogypsum (PG), mixed with slag and calcium-silicon-rich active material (GSR). The active powder (AP) was used to modify PBSS, and PBSS-AP was obtained. PBSS and PBSS-AP were each mixed with 10% silty soil, and cement and lime (CAL: 5% lime + 2% cement) were used as the traditional material for comparative experiments. Samples were cured under standard conditions, and tested for unconfined compressive strength (UCS), water stability, volume expansion, and leachate, to explore the stabilization effect of the three solidified materials on silty soil. The results showed that the comprehensive performance of sility soil mixed with 12% PBSS-AP was the best. The CaO, SiO₂ and Al₂O₃ provided by PG, Slag and GSR will react with water to form a stable C-S-H gel, which is conducive to stabilizing the soil. Field application results showed that the compaction exceeded 95%, the deflection was 144.9 mm, and UCS was 2.5 MPa after 28 days. These findings indicated that PBSS-AP is an effective stabilizer for subgrade soils.

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Keywords

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