摘要
采用“两步法”制得矿渣-粉煤灰基地聚物作为固化剂,通过无侧限抗压强度、SEM形貌观察和EDS能谱分析研究了地聚物固化软黏土的力学性能及固化机理,并评估地聚物作为固化剂与水泥相比的可靠性。结果表明:固化剂掺量相同的情况下,地聚物固化土比水泥固化土的微观结构更加密实,无侧限抗压强度更高,证实地聚物可以替代水泥作为固化剂,且其掺量宜取15%;增大地聚物中矿渣粉占比或提高碱激发剂掺量,都有助于提高地聚物固化土的强度;通过综合考虑,矿渣粉-粉煤灰比例宜取80∶20,碱激发剂掺量宜为30%。研究成果可为临江软弱土的加固提供新的思路,为类似工程提供参考。
The “two-step method” is used to prepare the slag-fly ash base polymer as a curing agent. The mechanical properties and curing mechanism of the geopolymer cured soft clay are studied through unconfined compressive strength, SEM morphology observation and EDS energy spectrum analysis, and the reliability of geopolymer as a curing agent is evaluated and compared with cement. The results show that under the same curing agent content, the geopolymer-solidified soil has a denser micro-structure than cement-solidified soil, and the unconfined compressive strength is higher. This proves that geopolymer can replace cement as a curing agent, and the mixing content should be 15%. Increasing the proportion of slag powder in the geopolymer or the content of alkaline activator contributes to the increase in the strength of the geopolymer solidified soil. Through comprehensive consideration, it is recommended that the ratio of slag powder to fly ash should be 80:20, and the content of alkaline activator should be 30%. The research results can provide new ideas for the reinforcement of the riverside soft soil and provide reference for similar projects.
作者
李新宇
罗彪
罗正东
LI Xin-yu;LUO Biao;LUO Zheng-dong(Hunan West Lake Construction Group Company Limited,Changsha 410000,China;College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China)
出处
《公路》
北大核心
2022年第7期48-54,共7页
Highway
基金
国家自然科学基金资助项目,项目编号12072309
湖南省重点研发计划项目,项目编号2018WK2111。
关键词
公路路基
地聚物固化土
搅拌桩
无侧限抗压强度
微观结构
highway roadbed
geopolymer solidified soil
mixing pile
unconfined compressive strength
micro-structure
