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Method for improving gradation of machined sand

A machine-made sand and gradation technology, which is applied in the field of machine-made sand gradation improvement, can solve the problem of lack of intermediate particles and achieve the effect of improved gradation

Active Publication Date: 2013-05-22
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The produced machine-made sand has a high powder content, but lacks intermediate particles

Method used

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  • Method for improving gradation of machined sand
  • Method for improving gradation of machined sand
  • Method for improving gradation of machined sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for improving the gradation of machine-made sand, comprising the following steps:

[0016] 1) Mix stone chips with a particle size of 0-4.75mm into the gravel with a particle size of 19-37.5mm, so that the stone chips with a particle size of 0-4.75mm are formed in the mixed material (that is, gravel and stone chips) The mass percentage in the mixed material) is 20%;

[0017] 2) Put it into the sand making machine to make sand, and then wash the sand to get the finished machine-made sand.

[0018] The finished machine-made sand (hereinafter referred to as improved machine-made sand) prepared by the above steps, and the finished machine-made sand obtained by completely using crushed stones with a particle size of 19-37.5mm, and then washing the finished machine-made sand (hereinafter referred to as Compared with the improved machine-made sand), the 1.18mm sieve residue in the finished machine-made sand was reduced from 49.8% to 44.1%, the content of fine particl...

Embodiment 2

[0023] A method for improving the gradation of machine-made sand, comprising the following steps:

[0024] 1) Mix stone chips with a particle size of 0-4.75mm into the gravel with a particle size of 19-37.5mm, so that the stone chips with a particle size of 0-4.75mm are formed in the mixed material (that is, gravel and stone chips) The mass percentage in the mixed material) is 35%;

[0025] 2) Put it into the sand making machine to make sand, and then wash the sand to get the finished machine-made sand.

[0026] The finished machine-made sand (hereinafter referred to as improved machine-made sand) prepared by the above steps, and the finished machine-made sand obtained by completely using crushed stones with a particle size of 19-37.5mm, and then washing the finished machine-made sand (hereinafter referred to as Compared with the machine-made sand before improvement), the 1.18mm sieve residue in the finished machine-made sand was reduced from 49.8% to 42.5%, the content of fi...

Embodiment 3

[0031] A method for improving the gradation of machine-made sand, comprising the following steps:

[0032] 1) Mix stone chips with a particle size of 0-4.75mm into the gravel with a particle size of 19-37.5mm, so that the stone chips with a particle size of 0-4.75mm are formed in the mixed material (that is, gravel and stone chips) The mass percentage in the mixed material) is 15%;

[0033] 2) Put it into the sand making machine to make sand, and then wash the sand to get the finished machine-made sand.

[0034] The finished machine-made sand (hereinafter referred to as improved machine-made sand) prepared by the above steps, and the finished machine-made sand obtained by completely using crushed stones with a particle size of 19-37.5mm, and then washing the finished machine-made sand (hereinafter referred to as Compared with the improved machine-made sand), the 1.18mm sieve residue in the finished machine-made sand was reduced from 49.8% to 46.4%, the content of fine particl...

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Abstract

The invention discloses a method for improving gradation of machined sand, which adopts any one or two processes: gradation feeding: doping stone dust with the particle size of 0-4.75mm into gravel with the particle size of 9.5-19mm or 19-37.5mm, and adding into a sand maker to make sand; two-stage doping: mixing and doping machined sand with the particle size of 0-4.75mm and machined sand with the particle size of 0-2.36mm; and industrial residue doping: doping industrial residue into machined sand with the particle size of 0-4.75mm. By adjusting the feeding gradation (adding part of stone dust 15-35%), the throughput rate of the fine particles in the finished product machined sand of the 1.18mm sieve is increased by 3-15%; by mixing a small amount of fine machined sand with the maximum particle size of 2.36mm with common machined sand, the fineness modulus of the machined sand can be adjusted, and the machining gradation curve can be optimized; and the industrial residue is doped into the machined sand at a certain ratio to enhance the fine particle content in the machined sand, thereby achieving the goal of improving the gradation of machined sand.

Description

technical field [0001] The invention relates to a method for improving the gradation of machine-made sand. Background technique [0002] In 2011, my country used 2.06 billion tons of cement and about 5 billion cubic meters of various concrete projects. Only cement concrete needs fine aggregates - about 3 billion tons of sand. Concrete sand is divided into two types: natural sand and artificial sand. Natural sand is formed by natural weathering, water flow handling, sorting and accumulation of rock particles with a particle size of less than 4.75mm. Sand is a non-renewable resource. Manufactured sand is made of rock particles with a particle size of less than 4.75 mm after soil removal mining, mechanical crushing, and screening. The gradation of machine-made sand is poor, usually more at both ends and less in the middle, that is, there are more coarse particles (above 2.36mm) and fine particles (below 0.15mm), but less intermediate particles (especially between 1.18 and 0.3...

Claims

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Application Information

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IPC IPC(8): C04B14/06
Inventor 曹亮宏沈卫国陈跃先刘文浩王孟霞王桂民赵青林麦伟雄谢兼亮卢自立
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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