Key Technology of Flow Fly Ash Backfilling of Bridge and Culvert Platform
Fluid fly ash is a kind of fluid mixture formed by mixing fly ash,cement or solid waste base cementing material,admixture and water in a certain proportion.It has the advantages of light weight,good compactness and high strength.This technology focuses on the application of industrial solid waste fly ash and whole solid waste cementing material in the structure platform back project,based on the whole solid waste cementing material-and other fine aggregates,develops the durability control technology of fluidized fly ash,and proposes the mix ratio of fluidized fly ash for the backfilling technology of bridge and culture-platform.After the mixing station is mixed intensively,the foundation pit is cleaned on site and the original ground is compacted.The edge soil,the front soil,and the cone slope soil are filled,and then the slope is brushed,the subgrade is excavated and compacted,and the flowing fly ash is poured,and the transition layer under the slab is constructed.It can greatly reduce the side pressure of the back of the bridge and culvert,effectively solve the problem of bridge head jumping caused by uneven settlement,and realize the resource and low-carbon utilization of solid waste such as fly ash.
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