循环流化床灰的物理特性及力学性能试验研究  

Research on Physical Properties and Mechanical Performance of Circulating Fluidized Bed Ash

作　　者：邓小鹏 任希庆 王小敏 DENG Xiao-peng;REN Xi-qing;WANG Xiao-min(Shanxi Institute of Energy,Jinzhong 030600,China;Fenyang Transport Bureau,Lyuliang 032200,China)

机构地区：[1]山西能源学院,晋中市030600 [2]汾阳市交通运输局,吕梁市032200

出　　处：《公路》2024年第4期280-285,共6页Highway

基　　金：山西省交通运输厅科技项目,项目编号2018-1-5;山西省高校教学改革创新项目,项目编号J20221260。

摘　　要：循环流化床灰与煤粉炉粉煤灰在物理特性及力学性能上有较大差别,阻碍了其大规模的利用,为解决循环流化床灰路基填料的合理利用问题,采用激光粒度检测仪、XRD、SEM及室内试验测试手段,对循环流化床灰的颗粒特征、物相组成、微观结构及路用力学性能进行了研究。研究结果表明:循环流化床灰的粒度主要分布在10~80μm,矿物成分主要为石英、硫酸钙等,没有莫来石;微观结构上,循环流化床灰颗粒表面凸凹不平,呈现不规则、扁平状的疏松形态,能形成较多的吸水孔隙,致使循环流化床灰在击实试验中需水量较大,最优含水量达38.6%;CBR值、回弹模量及抗剪强度均与压实度呈现较好的线性增长关系,随着压实度增大,CBR值、回弹模量及抗剪强度均会增长,但CBR值的增长幅度更大;当压实度达到92%后,循环流化床灰的抗剪强度随压实度的增加强度增长不显著。There are great differences between pulverized coal boiler fly ash and circulating fluidized bed ash in terms of the physical and mechanical properties,which has hindered its large-scale utilization.In order to solve the problem of rational utilization of circulating fluidized bed ash as the subgrade filler,the particle characteristics,phase composition,micro-structure and road mechanical properties of circulating fluidized bed ash are studied by means of laser particle size detector,XRD,SEM and indoor test.The results show that the particle size of circulating fluidized bed ash is mainly distributed in 10~80μm,the mineral composition is mainly quartz,calcium sulfate and so on,and there is no mullite.From the perspective of micro-structure,the surface of circulating fluidized bed ash particles is uneven,showing an irregular and flat loose shape,which can form more water absorption pores,resulting in a large water demand in the compaction test of circulating fluidized bed ash,and the optimal water content is 38.6%.The CBR,modulus of resilience and shear strength show a good linear growth relationship with compactness,with the increase of compactness,CBR,modulus of resilience and shear strength will increase,but the growth range of CBRis greater.When the compactness reaches 92%,the shear strength of circulating fluidized bed ash does not increase significantly with the increase of compactness.

关 键 词：路基工程 循环流化床灰 物理特性 CBR值 回弹模量 抗剪强度 

分 类 号：U414.03[交通运输工程—道路与铁道工程] U416.1[建筑科学—结构工程] TU472[建筑科学—土工工程]