磷酸镁水泥加固低液限粉土的pH和电导率响应与孔隙特征研究

doi:10.11896/cldb.23080046

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Abstract To explore the reinforcement of magnesium phosphate cement (MPC) on low liquid limit silt deposited in the Yellow River, this experiment studied the response of different MPC contents to dry soil, magnesium-phosphorus ratio m(M/P) and boric acid-magnesium oxide ratio m(BA/M) to the initial pH and conductivity of silt. The unconfined compressive strength, pH, conductivity, and hydration products of solidified soil with different ages and MPC contents were selected under defined m(M/P) and m(BA/M). Based on CT scanning technology, the pore network models of solidified soil with three kinds of MPC content were reconstructed, and the solidification mechanism was revealed by XRD phase analysis. The results show that with the increase of MPC content, the initial pH of the solidified soil decreases gradually when m(M/P) is small, while the pH increases first and then decreases when m(M/P) is significant. When the MPC content and m(M/P) were constant, with the increase of m(BA/M), the pH decreased to the lowest at a certain value (2%) and then gradually increased. Considering the low water consumption of low liquid limit silt and the need to promote hydration in the later stage, the acidic ratio (m(M/P)=1, m(BA/M)=2%) and less than 15%MPC content is recommanded. The pH increases with age and MPC content, and the conductivity decreases with pH increasing, these two have a negative exponential relationship and can qualitatively characterize hydration. The mechanical test results show that MPC can significantly improve the strength of silt, and the strength of solidified silt will increase as age and MPC content increase. The results of XRD and CT scanning show that the MPC solidification mechanism is S-Struvite and MgO cementation appearing and the interactive structure forming both between soil particles at all ages. With MPC content increasing, the bonding between soil particles is closer, and the formed soil skeleton improves the macroscopic mechanical strength. At the same time, it also expands the pore space, increases the porosity, enhances the connectivity between the pores, and increases permeability. Therefore, the solidification performance can be further improved in engineering applications by improving the pore structure.

Key words： low liquid limit silt magnesium phosphate cement pH value and electric conductivity unconfined compression strength pore network model

Published: 25 August 2024 Online: 2024-09-10

CLC number:

TU521.3

Fund:National Natural Science Foundation of China (52279105).

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	FAN Xuhan
	WANG Bingnan
	TANG Shihao
	XIN Xing
	PEI Yan

Cite this article:

FAN Xuhan,WANG Bingnan,TANG Shihao, et al. Study on pH, Conductivity Response and Pore Characteristics of Low Liquid Limit Silt Reinforced by Magnesium Phosphate Cement[J]. Materials Reports, 2024, 38(16): 23080046-9.

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http://www.mater-rep.com/EN/10.11896/cldb.23080046 OR http://www.mater-rep.com/EN/Y2024/V38/I16/23080046

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