Study on the Mix Design and Performance of High Strength Fluid Curing Soil Prepared with Redundant Soil

DOI: https://doi.org/10.62517/jcte.202506201

Author(s)

Li Zhanguo, Guo Ziyi, Zhou Yongxiang, Zhang Renjie, Chen Ying

Affiliation(s)

School of Civil Engineering, Beijing University of Technology, Beijing, China

Abstract

High-strength fluid-cured soil can be used as a new type of pile foundation material for pressure-type composite anti-pull piles, significantly enhancing the seismic performance of pile foundations and effectively addressing the issue of buoyancy resistance. The study focuses on preparing curing agents primarily from slag powder, steel slag powder, and desulfurization gypsum, mixed with excess construction waste soil to investigate their mechanical properties and micro-mechanisms. Results show that the optimal ratio is slag powder: steel slag powder: gypsum: alkaline activator = 60:13:14:13, with a water-to-curing agent ratio of 0.32. Compared to cement soil, this material offers advantages such as higher strength, lower cost, and reduced carbon emissions, with its compressive strength increasing with the addition of curing agent. Analysis of specimen size effects indicates that the strength of a 40mm × 40mm × 160mm prism is 1.1 to 1.15 times that of a 70.7mm cube and 1.2 to 1.25 times that of a 50mm × 100mm cylinder. Additionally, the self-shrinkage rate of this material is lower than that of cement soil, and it can exhibit slight expansion with increasing curing agent content. Microscopic mechanisms reveal that a multi-component composite curing agent reduces porosity and generates more calcium sulfoaluminate, thereby enhancing material strength.

Keywords

Flow Curing Soil; Solid Waste; Self-Shrinkage; Strength; Microstructure

References

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