复合水泥固化剂固化泥炭土渗透性研究  

Permeability of Peat Soil Solidified by Composite Cement Solidification Agent

作　　者：曹净[1] 张兴文 雷舒羽 李育红 程芸 CAO Jing;ZHANG Xingwen;LEI Shuyu;LI Yuhong;CHENG Yun(School of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China;YICH No.1 Engineering Survey and Design Co.,Ltd.,Kunming 650033,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南建投第一勘察设计有限公司,昆明650033

出　　处：《硅酸盐通报》2024年第10期3561-3571,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(41967035)。

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。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.

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 

分 类 号：TU447[建筑科学—岩土工程]