复合水泥固化剂固化泥炭土渗透性研究

摘要/Abstract

摘要： 针对泥炭土工程性质差、改良难度高的问题,本文提出了一种由超细水泥(UFC)和普通硅酸盐水泥(OPC)组成的复合水泥固化剂(CCS)用于固化模拟泥炭土,并通过渗压试验和X射线衍射(XRD)测试研究UFC对水泥土试样渗透性的影响规律。渗压试验结果表明:CCS掺入量相同时,试样渗透系数k随UFC质量分数的增加而减小,UFC质量分数大于12%时k值下降趋势显著减缓;CCS中UFC质量分数为12%时,k随CCS掺入量的增加而减小,CCS掺入量大于25%时下降趋势明显减缓。XRD测试结果显示,试样中水化硅酸钙(C-S-H)的衍射峰强度随UFC质量分数及养护龄期的增加而增强。相较于OPC,CCS以更少的水泥用量便能达到优异的固化效果,从而实现减碳目标。

关键词: 复合水泥固化剂, 泥炭土, 超细水泥, 渗透系数, X射线衍射, 减碳

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

中图分类号:

TU447

曹净, 张兴文, 雷舒羽, 李育红, 程芸. 复合水泥固化剂固化泥炭土渗透性研究[J]. 硅酸盐通报, 2024, 43(10): 3561-3571.

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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