摘要
硅酸盐水泥作为常规的土壤固化剂存在高能耗、高排放等问题,研究人员一直在寻求一种更加经济环保的水泥代替品。使用基于高炉矿渣(ground granulated blast-furnace slag,简称GGBS)、粉煤灰(fly ash,简称FA)的地聚合物对砂土进行加固,通过调整激发剂的种类和配比、矿渣与粉煤灰比例、水灰比和养护条件等,研究不同因素对地聚合物固化砂土力学性能的影响。通过无侧限抗压强度(unconfinedcompressivestrength,简称UCS)测试、电子计算机断层扫描(computed tomography,简称CT)分析、扫描电子显微镜(scanning electron microscope,简称SEM)对试样进行了深入研究。结果表明:基于GGBS-FA的地聚合物可有效地提高砂土的力学性能;复合激发剂的加固效果优于单组分激发剂;低温不会明显降低地聚合物固化砂土的最终力学性能,仅延缓了地质聚合反应和结构的形成;碱性环境对地聚合物固化砂土的强度有促进作用;酸性环境及长时间暴露在空气中,会降低地聚合物固化砂土的强度。
Silicate cement as a conventional soil curing agent has problems of high energy consumption and high emissions,and researchers have been seeking a more economical and environmentally friendly alternative to cement.In this study,geopolymers based on ground granulated blast-furnace slag(GGBS) and fly ash(FA) were used to reinforce sandy soils,and the effects of different factors on the mechanical properties of geopolymer stabilized sandy soils were investigated by adjusting the type and ratio of exciter,slag-fly ash ratio,water-cement ratio,and curing conditions.The specimens were studied in depth by unconfined compressive strength(UCS) test,electron computed tomography(CT) analysis,and scanning electron microscopy(SEM).The results show that the GGBS-FA-based geopolymer can effectively improve the mechanical properties of the sandy soil;the reinforcement effect of the composite exciter is better than that of the single-component exciter;the low temperature does not significantly reduce the final mechanical properties of the geopolymer stabilized sandy soil,but only delays the polymerization reaction and structure formation;the alkaline environment promotes the strength of the geopolymer stabilized sandy soil;the acidic environment and prolonged exposure to air reduce the strength of geopolymer stabilized sandy soils.
作者
张津津
李博
余闯
张茂雨
ZHANG Jin-jin;LI Bo;YU Chuang;ZHANG Mao-yu(College of Architecture and Civil Engineering,Wenzhou University,Wenzhou,Zhejiang 325035,China;Wenzhou Key Laboratory of Intelligent LifelineProtection and Emergency Technology for Resilient City,Wenzhou Institute of Technology,Wenzhou,Zhejiang 325035,China;School of Civil Engineering and Architecture,Taizhou University,Taizhou,Zhejiang 318000,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2022年第9期2421-2430,共10页
Rock and Soil Mechanics
基金
国家自然科学基金项目(No.51978531)
浙江省公益项目(No.LGG22E080006)。
