Research on Physical Properties and Mechanical Performance of Circulating Fluidized Bed Ash
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 10～80 μm,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 CBR is greater.When the compactness reaches 92％,the shear strength of circulating fluidized bed ash does not increase significantly with the increase of compactness.
subgrade engineeringcirculating fluidized bed ashphysical propertiesCBRmodulus of resilienceshear strength
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