微生物改性影响钢渣安定性效果及其在道路工程中的应用  

EFFECT OF MICROBIAL MODIFICATION ON STEEL SLAG ON ITS STABILITY AND ITS APPLICATION IN ROAD ENGINEERING

作　　者：刘志华 宁贝瑶 荣辉 王安辉[3] 张艳芳 冯阳 刘德娥 韩兆攀 岳昌盛 戴骁蒙[5] LIU Zhihua;NING Beiyao;RONG Hui;WANG Anhui;ZHANG Yanfang;FENG Yang;LIU De′e;HAN Zhaopan;YUE Changsheng;DAI Xiaomeng(School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Building Green Functional Materials,Tianjin Chengjian University,Tianjin 300384,China;China Construction Industrial&Energy Engineering Group Co.,Ltd.,Nanjing 210023,China;Central Research Institute of Building&Construction,MCC Group Co.,Ltd.,Beijing 100088,China;China Railway Construction Bridge Engineering Bureau Group Construction Assembly Technology Co.,Ltd.,Tianjin 300300,China)

机构地区：[1]天津城建大学材料科学与工程学院,天津300384 [2]天津城建大学天津市建筑绿色功能材料重点实验室,天津300384 [3]中建安装集团有限公司,南京210023 [4]中冶建筑研究总院有限公司,北京100088 [5]中铁建大桥工程局集团建筑装配科技有限公司,天津300300

出　　处：《环境工程》2024年第7期208-216,共9页Environmental Engineering

基　　金：国家自然科学基金项目(52178264、52178265、52278268、52278269);天津市重点研发计划科技支撑重点项目(20YFZCSN00520);中国铁建股份有限公司科技重大专项(2020-A01);中铁建大桥工程局集团科技创新项目(DQJ-2021-A03)。

摘　　要：为快速高效解决钢渣安定性问题,研究了巴氏芽孢杆菌微生物改性钢渣安定性用的材料因素(微生物浓度、尿素浓度)和处置方法(处置时间、处置温度)对钢渣安定性和抗压强度的影响,并通过X射线衍射分析仪、扫描电子显微镜等手段分析不同因素对微生物改性钢渣性能影响效果机制。在此基础上,将改性合格的钢渣应用于道路基层,测定其试件的7 d无侧限抗压强度和浸水膨胀率。研究结果表明:1)利用巴氏芽孢杆菌微生物可以有效的改善钢渣的体积安定性。当微生物掺量为钢渣质量的60%,尿素浓度2 mol/L,处置温度(20±2)℃,处置时间72 h时,微生物对钢渣中安定性处置效果最好,此时钢渣中游离氧化钙(f-CaO)含量为2.98%,符合YB/T 4184—2018《钢渣集料混合料路面基层施工技术规范》要求。2)利用改性钢渣制备道路基层材料,当水泥掺量为6%时,高速和一级公路基底层、二级及二级以下的公路基底层,和二级及以下公路基层的7 d无侧限抗压强度分别为4.1 MPa、4.6 MPa、5.1 MPa,与未改性前相比分别提升了20.6%、9.5%、8.5%,浸水膨胀率分别是1.77%、1.84%、1.92%,均符合YB/T 4184—2018中浸水膨胀率<2%的要求。In order to quickly and efficiently solve the stability problem of steel slag,this paper studied the effects of material factors(microbial concentration,urea concentration)and treatment methods(treatment time,treatment temperature)on the stability and compressive strength of steel slag modified by Bacillus Pasteuris.The impact of the above factors on the properties of microbe-modified steel slag was analyzed using X-ray diffraction analyzer,scanning electron microscope,and other testing methods.On this basis,the modified steel slag was applied to the road base,and the 7-day unconfined compressive strength and water-soaked expansion rate of the specimen were studied.The results showed that:1)the volume stability of steel slag could be effectively improved by using Bacillus pasteuris.When the microbial content was 60% of the mass of steel slag,the urea concentration was 2 mol/L,the treatment temperature was(20±2)℃,and the treatment time was 72 h,the treatment effect of microbial on steel slag was the best,and the content of f-CaO in steel slag was 2.98%,which met the requirements of the code.2)using modified steel slag to prepare road base material,when the cement content was 6%,the 7-day unconfined compressive strength of the base course of Expressway and classⅠhighway,the base course of classⅡand below highways,and the base-bottom course of classⅡand below highways are 4.1 MPa,4.6 MPa and 5.1 MPa,respectively.Compared with the specimens before modification,they were increased by 20.6%,9.5%,and 8.5%,respectively.The water-soaked expansion rates were 1.77%,1.84%,and 1.92%,respectively,which all met the requirements in the code of less than 2%.

关 键 词：钢渣 微生物 安定性 抗压强度 浸水膨胀率 

分 类 号：X757[环境科学与工程—环境工程] U414[交通运输工程—道路与铁道工程]