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
曹净 1张兴文 1雷舒羽 1李育红 2程芸2
作者信息
- 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
- 折叠
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.
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.
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Key words
composite cement solidification agent/peat soil/ultra-fine cement/permeability coefficient/X-ray diffraction/carbon reduction引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据