大掺量钢渣微粉-水泥泡沫轻质土的性能  

Performance of foam lightweight soil with large amount of steel slag powder-cement

作　　者：张彩利 王犇 于焱龙 张崇僖 孟庆营 龚芳媛 ZHANG Caili;WANG Ben;YU Yanlong;ZHANG Chongxi;MENG Qingying;GONG Fangyuan(College of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Tianjin Traffic Engineering Green Material Technology Engineering Center,Tianjin 300401,China;Heilongjiang Longgao Highway Maintenance Engineering Co.,Ltd.,Harbin 150000,China;Tianjin Kaimande Engineering Technology Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]天津市交通工程绿色材料技术工程中心,天津300401 [3]黑龙江龙高公路养护工程有限公司,黑龙江哈尔滨150000 [4]天津市凯曼德工程技术有限公司,天津300450

出　　处：《中国粉体技术》2024年第3期51-63,共13页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52008154。

摘　　要：【目的】提高钢渣利用率,实现部分钢渣替代水泥制备钢渣微粉-水泥泡沫轻质土,制备更加经济型的高性能泡沫轻质土。【方法】采用抗压强度、抗硫酸盐腐蚀等试验研究不同钢渣微粉掺量(质量比,下同)、水灰比(质量比,下同)、湿密度等泡沫轻质土物理力学特性及耐久性。【结果】随着钢渣微粉掺量的增加,泡沫轻质土抗压强度降低,吸水率增大,沉陷距减小;随着水灰比增大,泡沫轻质土吸水率、流值、沉陷距增大,抗压强度呈现先增后减的趋势,水灰比为0.7时,龄期为7、28、60 d的抗压强度达到最高,分别为0.68、0.90、1.28 MPa;随着湿密度的增大,抗压强度和流值增大,吸水率减小,沉陷距增大;施工湿密度为600 kg/m^(3)、水灰比为0.70、钢渣微粉掺量为50%时,泡沫轻质土水稳定系数为0.852,冻融稳定系数为0.752,28 d抗压强度可以达到0.90 MPa。【结论】钢渣微粉和碱性激发剂的掺入,能够有效提高钢渣利用率,同时减少水泥使用量;掺量为50%的钢渣微粉-水泥泡沫轻质土的力学性能得到保障。Objective To enhance the utilization efficiency of steel slag solid waste,a method was devised to prepare steel slag powdercement foam lightweight soil by replacing part of cement with steel slag.The road performance of the foamed lightweight soil was then analyzed after the incorporation of steel slag powder to develop economically viable,high-performance foamed lightweight soil.Methods The PO42.5 ordinary Portland cement and steel slag micro-powder were used as the main materials,complemented by sodium carbonate,triethanolamine agents,and a composite foaming agent.During the experimental process,the materials were weighed using an electronic balance and then mixed in a blender according to the specified proportions.Subsequently,diluted foaming agent was added to water to generate fine and dense foam,which was thoroughly mixed with the steel slag micro-powdercement slurry and poured into cubic molds with its surface leveled.Regarding its performance,the flowability,water absorption rate,water stability,and freeze-thaw stability were assessed based on referenced standards.Additionally,settlement distance and compressive strength were measured at different ages.Furthermore,an anti-sulfate corrosion test was performed by immers⁃ing specimens in solutions with varying sulfate concentrations to assess changes in compressive strength over time.This work investigated the impact of varying steel slag powder content(40%to 70%),water-cement ratio(0.60 to 0.75),wet density grade(600 kg/m^(3) to 900 kg/m^(3)),and curing time on the flow value,water absorption,settlement distance,compressive strength,water stability,freeze-thaw stability,and sulfate corrosion resistance of foamed lightweight soil.Results and Discussion As the steel slag powder content increased,the water absorption rate and flow value of the steel slag powder-cement foam lightweight soil gradually increased.Simultaneously,the settlement distance increased with a higher watercement ratio.Compressive strength initially increased and then decreased with the e

关 键 词：泡沫轻质土 钢渣微粉 物理特性 力学性能 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学] TB4[一般工业技术]