Permeability of Peat Soil Solidified by Composite  Cement Solidification Agent

Abstract

Abstract: In response to the challenges of poor engineering properties and the high difficulty in improving peat soil, a composite cement solidification agent (CCS) comprising ultra-fine cement (UFC) and ordinary Portland cement (OPC) was proposed for the solidification of simulated peat soil. The influence of UFC on the permeability of cement-soil samples was investigated through osmotic pressure tests and X-ray diffraction (XRD) experiments. Osmotic pressure tests results indicate that, under constant CCS dosage, the permeability coefficient k of specimens decreases with increasing UFC mass fraction, with a significant attenuation of the decreasing trend observed when the UFC mass fraction exceeds 12%. For CCS with a UFC mass fraction of 12%, k decreases with increasing CCS dosage, and the declining trend is notably attenuated when the dosage exceeds 25%. XRD results indicate that the diffraction peak intensity of calcium silicate hydrate (C-S-H) in the samples increases with both the increase in the UFC mass fraction and the curing time. Compared to OPC, CCS achieves superior solidification efficiency with a reduced cement dosage, facilitating the attainment of carbon reduction objectives.

Key words: composite cement solidification agent, peat soil, ultra-fine cement, permeability coefficient, X-ray diffraction, carbon reduction

CLC Number:

TU447

CAO Jing, ZHANG Xingwen, LEI Shuyu, LI Yuhong, CHENG Yun. Permeability of Peat Soil Solidified by Composite Cement Solidification Agent[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(10): 3561-3571.

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Permeability of Peat Soil Solidified by Composite Cement Solidification Agent

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