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Particle shaping method for machine-made aggregate

A kind of aggregate and mechanism technology, applied in the field of particle shaping of machine-made aggregates, can solve the problem that the content of needle flake particles has little effect, and achieve the effect of reducing the content of needle flake particles and improving strength

Inactive Publication Date: 2015-11-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to improve the quality of recycled aggregates, a variety of high-quality recycled aggregate production processes have been developed at home and abroad, such as grinding and shaping, thermal-mechanical separation, acid liquid pre-soaking, etc., which can better separate the weak particles on the surface of recycled aggregates. , but it has little effect on reducing the content of needle-like particles in the recycled aggregate

Method used

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  • Particle shaping method for machine-made aggregate

Examples

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Effect test

Embodiment 1

[0019] After a natural rock is crushed and coarsely screened by a jaw crusher, natural machine-made coarse aggregate with a nominal particle size of 5-40 mm and machine-made sand with a nominal particle size of less than 5 mm are obtained, and then the aggregate particle size is determined by the distance between the rollers The upper limit of the roller press is used for shaping treatment, that is, when the coarse aggregate is rolled and shaped, the distance between the rollers is 40mm, and when the machine-made sand is rolled and shaped, the distance between the rollers is 5mm, and the shaped coarse aggregate and machine-made sand are further screened deal with.

[0020] According to "Gravel and Pebble for Construction" GBT14685-2011, the coarse aggregate before and after plastic treatment is tested for particle size distribution, needle flake particle content and crushing index. The test results are shown in Table 1-1. It can be seen from Table 1-1 that after plastic treatm...

Embodiment 2

[0027] After the waste concrete is crushed and coarsely screened by a jaw crusher, the recycled mechanism coarse aggregate with a nominal particle size of 5 to 40mm and the recycled mechanism fine aggregate with a nominal particle size of less than 5mm are obtained, and then the aggregate is obtained by using the roller spacing respectively. The roller press with the upper limit of the particle size is used for shaping treatment, that is, when the coarse aggregate is rolled and shaped, the roller spacing is 40mm, and when the fine aggregate is rolled and shaped, the roller spacing is 5mm, and the coarse and fine aggregates after shaping Further screening is carried out.

[0028] According to "Gravel and Pebble for Construction" GBT14685-2011, the coarse aggregate before and after shaping treatment is tested for particle gradation, needle-like particle content and crushing index. The test results are shown in Table 2-1. It can be seen from Table 2-1 that after plastic treatment...

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Abstract

The invention discloses a particle shaping method for machine-made aggregate. The method comprises the steps that the broken machine-made aggregate is firstly sieved through a square mesh sieve to obtain the thick aggregate with the nominal particle diameter of 5-40 mm and the thin aggregate with the nominal particle diameter smaller than 5 mm, and then rolling shaping treatment is performed on the thick aggregate and the thin aggregate through a rolling machine to obtain the shaped thick aggregate and thin aggregate. According to the shaping method, the content of elongated and flaky particles can be decreased, the strength of the recycled aggregate is improved, and the improvement of the workability of a freshly mixed concrete mixture is facilitated.

Description

(1) Technical field: [0001] The invention relates to a particle shaping technology of machine-made aggregate, which belongs to the technical field of building material production. (2) Background technology [0002] Mechanism natural aggregates widely used in the construction industry, due to different crushing methods, some crushing methods, especially jaw crushers, produce natural coarse aggregates containing more needle-like particles, while Machine-made sand generally contains a lot of needle flake particles. The existence of these needle flake particles not only affects the workability of fresh concrete, but also because it is easy to break, its crushing strength is relatively low, which will obviously affect the hardening. the strength of concrete. [0003] On the other hand, with the rapid development of the construction industry and infrastructure construction, various construction wastes have increased unprecedentedly. If the waste concrete contained in them is used...

Claims

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Application Information

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IPC IPC(8): C04B18/16C04B14/02
CPCY02W30/91
Inventor 万励孔德玉徐林强
Owner ZHEJIANG UNIV OF TECH
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