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固废基软土固化材料的研制及在浅层就地固化工程中的应用研究
作者：舒本安1，陈伟忠2，任彦飞1，李永铃1，郑礼尚1，杨腾宇1，曾国东1
（1.佛山市交通科技有限公司，广东 佛山 528000；2.佛山市建盈发展有限公司，广东 佛山 528000）
摘要：研究了固废（矿渣粉、钢渣粉）粒径对其活性及固化土性能的影响，开展了固化剂配合比试验及微观分析，并将固化剂应用于某工程浅表层就地固化试验段。结果显示，固废粒径与其活性及固化土的力学性能呈负相关性，活性与固化土性能呈正相关性；碱激发剂复配固化土性能优于单一效果，总量不变时固化土的早期性能与矿渣粉相对掺量成正比，与钢渣粉相对掺量成反比；确定的试验段用固化剂室内7 d强度为0.17 MPa，至28 d龄期时仍有近30%强度增长；固化剂固化土中产生的大量C-S-H等凝胶胶结了土颗粒成为一个整体；就地固化工程试验段显示，固化剂掺量为4.5%时7 d龄期固化土承载力即已达到设计要求的28 d无侧限抗压强度0.15 MPa。
关键词：固化材料；固废；无侧限抗压强度；就地固化；工程应用
中图分类号：TU449 文献标识码：A 文章编号：1001-702X（2022）11-0121-06
Research on development of solid waste soft soil based solidification material and its application in shallow in-situ solidification engineering
SHU Benan1，CHEN Weizhong2，REN Yanfei1，LI Yongling1，ZHENG Lishang1，YANG Tengyu1，ZENG Guodong1
（1.Foshan Transportation Science and Technology Co. Ltd.，Foshan 528000，China；
2.Foshan Jianying Development Co. Ltd.，Foshan 528000，China）
Abstract：In this paper，the effect of particle size of solid waste（ground granulated blast furnace slag powder and steel slag powder） on its activity and the properties of solidified soil is studied. Then the mix proportion test and microscopic analysis of solidifying agent are carried out. Finally，the solidifying agent is successfully applied to the shallow soft soil in-situ solidification test section of a project. The results show that the particle size of solid waste is negatively correlated with its activity and the mechanical properties of solidified soil，and the activity is positively correlated with the properties of solidified soil. The performance of solidified soil mixed with compound alkali activator is better than that of a single effect. When the total amount remains unchanged，the early age performance of solidified soil is directly proportional to the relative amount of slag powder，and inversely proportional to the relative amount of steel slag powder. Laboratory strength of the solidified materials used in the engineering is 0.17 MPa for 7 days of curing，and there is still nearly 30% strength increase at 28 days. A large number of C-S-H gel formed in the solidified soil cemented the soil particles into a whole. The test section of the in-situ solidifying engineering shows that when the solidifying material dosage is 4.5%，the bearing capacity of the 7 d curing age solidified soil satisfies the unconfined compressive strength of 0.15 MPa required by the design at 28 d curing age.
Key words：solidified materials，solid waste，unconfined compressive strength，in situ curing，engineering application