生活垃圾焚烧炉渣集料处治土性能与处治机理
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摘要
为研究生活垃圾焚烧炉渣集料(BAA)对土的处治效果和机理,采用X射线衍射仪(XRD)分析了BAA的化学组成和矿物组成,测定了BAA处治淤泥质土和粉质黏土的承载比(CBR)、无侧限抗压强度和回弹模量,分析了BAA掺量、BAA养生龄期、饱水和干湿循环条件等因素对处治土强度和变形特性的影响,探究了BAA对土的处治机理.结果表明:随着BAA掺量的增加,养生龄期的延长,2种处治土的CBR值、回弹模量和水稳定性均呈增大趋势;BAA对粉质黏土性能的提升效果优于对淤泥质土性能的提升效果;BAA的摩阻效应及其提供的水硬特性和火山灰反应是处治土性能提升的主要原因.综合考虑,推荐采用高活性BAA对土进行处治,并适当提高BAA掺量,延长养生龄期.
The treatment effect and mechanism of municipal solid waste incineration bottom ash aggregate(BAA) on soils were investigated. The strength and deformation of BAA treated silty clay, BAA treated mucky soil were conducted by CBR test, unconfined compressive strength test, and resilient modulus test, respectively. The influence of BAA proportions, curing period, water saturated treatment, drying-wetting cycle treatment on the strength and deformation property of BAA treated soils were investigated. Then, the chemical composition and mineral composition of BAA were investigated by XRD test, therefore the treatment mechanism of BAA treated soils were analyzed subsequently. Results show that CBR value, resilient modulus and water stability of two treated soils increase with the increase of BAA proportion and curing period. The property improvement effect of BAA on silty clay is better than mucky soil. The friction effect, hydraulicity, and pozzolanic reaction of BAA are the main reasons for the property improvement of soils. Considering test results comprehensively, it is recommended to treat soils with highly active BAA, and BAA proportion and curing period should be increased appropriately.
The treatment effect and mechanism of municipal solid waste incineration bottom ash aggregate(BAA) on soils were investigated. The strength and deformation of BAA treated silty clay, BAA treated mucky soil were conducted by CBR test, unconfined compressive strength test, and resilient modulus test, respectively. The influence of BAA proportions, curing period, water saturated treatment, drying-wetting cycle treatment on the strength and deformation property of BAA treated soils were investigated. Then, the chemical composition and mineral composition of BAA were investigated by XRD test, therefore the treatment mechanism of BAA treated soils were analyzed subsequently. Results show that CBR value, resilient modulus and water stability of two treated soils increase with the increase of BAA proportion and curing period. The property improvement effect of BAA on silty clay is better than mucky soil. The friction effect, hydraulicity, and pozzolanic reaction of BAA are the main reasons for the property improvement of soils. Considering test results comprehensively, it is recommended to treat soils with highly active BAA, and BAA proportion and curing period should be increased appropriately.
引文
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[11] 郭印,徐日庆,邵允铖.淤泥质土的固化机理研究[J].浙江大学学报(工学版),2008,42(6):1071-1075.GUO Yin,XU Riqing,SHAO Yuncheng.Research on curing mechanism of mucky soil[J].Journal of Zhejiang University(Engineering Science),2008,42(6):1071-1075.(in Chinese)
[2] 刘栋,李立寒,杨昆.生活垃圾焚烧炉渣沥青混合料的耐久性能[J].同济大学学报(自然科学版),2016,44(1):100-106.LIU Dong,LI Lihan,YANG Kun.Durability study of domestic garbage incinerated bottom ash asphalt aggregate[J].Journal of Tongji University(Natural Science),2016,44(1):100-106.(in Chinese)
[3] NIKBIN I M,SAMAN R R,ALLAHYARI H,et al.A comprehensive analytical study on the mechanical properties of concrete containing waste bottom ash as natural aggregate replacement[J].Construction and Building Materials,2016,121:746-759.
[4] 刘栋,李立寒,崔华杰.炉渣集料对沥青混合料性能影响的试验研究[J].建筑材料学报,2015,18(2):307-311.LIU Dong,LI Lihan,CUI Huajie.Experimental study on the influence of bottom ash aggregate (BAA) on the performance of asphalt mixture[J].Journal of Building Materials,2015,18(2):307-311.(in Chinese)
[5] 刘栋,李立寒,崔华杰.水泥稳定炉渣碎石基层路用性能[J].同济大学学报(自然科学版),2015,43(3):405-409.LIU Dong,LI Lihan,CUI Huajie.Pavement performance of cement stabilized aggregate base containing bottom ash aggregate[J].Journal of Tongji University(Natural Science),2015,43(3):405-409.(in Chinese)
[6] 刘栋,李立寒,崔华杰.水泥稳定炉渣碎石的强度性能[J].建筑材料学报,2014,17(3):538-542.LIU Dong,LI Lihan,CUI Huajie.Strength performance of cement stabilized aggregate containing bottom ash aggregate(BAA)[J].Journal of Building Materials,2014,17(3):538-542.(in Chinese)
[7] 许四法,杨杨,王哲.垃圾焚烧炉渣的土工特性[J].解放军理工大学学报(自然科学版),2011,12(2):144-148.XU Sifa,YANG Yang,WANG Zhe.Geotechnical properties of MSW-incinerated bottom ash[J].Journal of PLA University of Science and Technology(Natural Science),2011,12(2):144-148.(in Chinese)
[8] 陈德华,宗超男,余锦江.浅谈淤泥质软土地基处理[J].中国水利,2003(10):58-59.CHEN Dehua,ZONG Chaonan,YU Jinjiang.Discussion on treatment of mucky soft soil foundation[J].China Water Conservancy,2003(10):58-59.(in Chinese)
[9] 杨新华.炉渣微粉作为胶凝材料应用于全尾砂膏体充填试验研究[D].衡阳:南华大学,2014.YANG Xinhua.The lead base slag powder as cementing material application in CPB paste test research[D].Hengyang:Nanhua University,2014.(in Chinese)
[10] 刘栋,李立寒.生活垃圾焚烧炉渣集料的胶凝特性[J].同济大学学报(自然科学版),2017,45(2):377-383.LIU Dong,LI Lihan.Cementitious properties of municipal solid waste incineration bottom ash aggregate[J].Journal of Tongji University(Natural Science),2017,45(2):377-383.(in Chinese)
[11] 郭印,徐日庆,邵允铖.淤泥质土的固化机理研究[J].浙江大学学报(工学版),2008,42(6):1071-1075.GUO Yin,XU Riqing,SHAO Yuncheng.Research on curing mechanism of mucky soil[J].Journal of Zhejiang University(Engineering Science),2008,42(6):1071-1075.(in Chinese)
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