Preparation method of artificial coarse aggregates based on silty-fine sand matrix

Abstract

The invention discloses a preparation method of artificial coarse aggregates based on a silty-fine sand matrix. The preparation method comprises the following steps: determining the line grade of a railway project under construction; determining the corresponding railway roadbed stuffing grade according to the line grade; determining the strength control index of the artificial coarse aggregates adaptive to the railway roadbed stuffing grade; mixing and uniformly stirring cement and water to form cement slurry, wherein the water and ash mass ratio of the cement slurry is 0.4-1.0, and then mixing the cement slurry with silty-fine sand particles uniformly to form agglomerated cement mortar; and crushing the agglomerated cement mortar and screening particles with the grain size larger than 60mm for crushing again to obtain the artificial coarse aggregates with the grain size smaller than 60mm. The preparation method disclosed by the invention has the beneficial effects that the silty-fine roadbed stuffing grade is improved, the artificial coarse aggregates are blended by making full use of roadbed stuffing in areas along the railway, waste is turned into wealth, the carrying performance and the compaction performance of the stuffing are improved effectively, and the railway project cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of reinforcement and improvement of fillers for bad subgrades of railway engineering, and in particular relates to a method for preparing artificial coarse aggregates based on silty fine sand substrates. Background technique [0002] As of the end of 2016, the total mileage of my country's railway operations reached 120,000 kilometers, which also marks that my country's railway engineering construction and operation have reached a new stage, and high-density coverage of most of the central and eastern regions of my country has been basically achieved. At the same time, there are large areas of deserts in Northwest China and Inner Mongolia and Liaoning in Northeast my country. How to build high-grade railways in desert areas and solve the problems of material selection and quality control of roadbed fillers have always restricted the construction and operation of railways in desert areas. central issue of secu...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problem of low filler level and poor improvement effect of silt and fine sand used as roadbed filler in railway subgrade engineering in my country, and invents a fast, economical and efficient method based on silt and fine sand matrix for improving the filler level of silt and fine sand roadbed The preparation method of artificial coarse aggregate