岩土力学2025，Vol.46Issue(7)：2039-2048,2134,11.DOI:10.16285/j.rsm.2024.1266
纳米改性地聚合物隔离墙材料基本工程特性及冻融循环耐久性研究
Basic properties and freeze-thaw durability of nano-modified geopolymer cutoff wall materials
摘要
Abstract
Nanomaterial modification can significantly enhance the mechanical properties and durability of engineering materials.However,its impact on the basic properties of geopolymer cutoff wall materials and their durability under freeze-thaw cycles remains unclear.In this study,fly ash-based geopolymer was modified with nano-silica(NS)and graphene oxide(GO).The slump,heat of hydration,hydraulic conductivity,and compressive strength of the materials were systematically tested to assess the effects of nanomaterial type and content on the basic properties of cutoff wall materials.Furthermore,freeze-thaw cycling test was conducted to evaluate the durability of geopolymer.Fourier-transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),and mercury intrusion porosimetry(MIP)were used to explore the modification mechanisms.Results showed that the addition of nanomaterials resulted in an increase in hydraulic conductivity compared to unmodified samples.As NS content increased,the nanomaterial filled the pores,reducing hydraulic conductivity.GO addition,on the other hand,accelerated geopolymerization,further lowering the permeability.NS improved freeze-thaw resistance by refining the pore structure through micro-aggregate effect and inducing secondary hydration products that filled cracks,thus slowing down material degradation during freeze-thaw cycles.However,GO addition caused exfoliation of nanosheets and associated geopolymer gels during freeze-thaw cycles,resulting in localized structural damage and reducing freeze-thaw durability and impermeability.关键词
隔离墙/地聚合物/纳米材料/渗透系数/冻融循环Key words
cutoff wall/geopolymer/nanomaterial/hydraulic conductivity/freeze-thaw cycles分类
建筑与水利引用本文复制引用
刘文林,鄂天龙,冯杨州,牛松荧,张子堂,孙熠,陈宏信..纳米改性地聚合物隔离墙材料基本工程特性及冻融循环耐久性研究[J].岩土力学,2025,46(7):2039-2048,2134,11.基金项目
国家重点研发计划项目(No.2023YFC3707900,No.2022CSJGG1202) （No.2023YFC3707900,No.2022CSJGG1202）
国家自然科学基金面上项目(No.42277148,No.42477183).This work was supported by the National Key Research and Development Program of China(2023YFC3707900,2022CSJGG1202)and the Gerenal Project of National Natural Science Foundation of China(42277148,42477183). （No.42277148,No.42477183）
