Preparation method of machine-made sand capable of replacing natural sand

A technology of manufactured sand and natural sand, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. question

Inactive Publication Date: 2013-09-18
NANJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual use, these problems seriously affect the workability, slump, compressive streng...

Method used

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  • Preparation method of machine-made sand capable of replacing natural sand
  • Preparation method of machine-made sand capable of replacing natural sand
  • Preparation method of machine-made sand capable of replacing natural sand

Examples

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Embodiment 1

[0057] This example is based on the quality standard of GB / T 14684 "Sand for Construction", and mainly controls the gradation, mud content, stone powder content, and fineness modulus index. The preparation process can be combined with the attached figure 1 come to understand.

[0058] (1) Preparation process of machine-made sand products

[0059] ①Using andesite as raw material, it is subjected to coarse crushing by gyratory crusher, intermediate crushing by cone crusher and fine crushing by cone crusher to obtain crushed stone. Vibrating sieve sieving, vibrating sieve water washing, spiral sand washing machine fishing, high-frequency sieve dehydration to obtain 0 ~ 5mm ordinary sand, the graded waste water containing fine sand is subjected to solid-liquid separation process, that is, hydrocyclone centrifugal separation After dehydration with high-frequency sieve, 0-1mm fine sand (part) is obtained.

[0060] ② Take part of the 0-5mm ordinary sand through the feeder, and siev...

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Abstract

The invention relates to a preparation method of machine-made sand capable of replacing natural sand. The machine-made sand is mixed by four or more than four kinds of sand in different specifications as semi-finished products under constraint of graduation, content of mountain flour, clay lump content and fineness modulus of sand for buildings. The method is helpful for recycling waste resources and has the advantages of low comprehensive cost, simpleness in operation, environment-friendly process, large-scale continuous production and the like. The technical quality of the product fully meets the standard of sand for buildings and can completely replace natural sand, so that the machine-made sand can be widely applied to the field of concrete for buildings such as bridges, roads, tubular piles and buildings.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing machine-made sand that can replace natural sand. Background technique [0002] Sand is a concrete fine aggregate, which plays a filling role in concrete products, can improve the compactness of concrete, and has a great influence on concrete performance. Relevant data show that in 2012, the total production and sales of construction sand and gravel in my country was about 10 billion tons, the total mining volume was five times that of 2001, and the total sand production was about 5 billion tons. It is estimated that the total output of sand and gravel in my country will reach 16 billion tons in 2016, and the total output of sand will reach 8 billion tons. [0003] There are mainly two types of sand: natural sand and machine-made sand. At present, the construction sand in my country is still dominated by natural sand, mainly river sand, river s...

Claims

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Application Information

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IPC IPC(8): C04B14/02C04B18/04
CPCY02W30/91
Inventor 邵建峰姚绍武
Owner NANJING UNIV OF TECH
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