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Method for recycling waste concrete broken fine particles

A technology of waste concrete and fine particles, which is applied in the field of building materials production, can solve the problems of low added value of recycled products and high cost of recycling waste concrete, and achieve the goals of reducing mold collapse, improving the strength of aerated concrete, and increasing the alkali content Effect

Inactive Publication Date: 2011-01-26
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another way to recycle waste concrete is to separate the aggregate and cement stone in waste concrete by means of heat treatment, grinding and grading to produce high-quality recycled aggregate and recycled cementitious materials, but this method This leads to a substantial increase in the cost of recycling waste concrete, while the added value of recycled products is not high

Method used

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  • Method for recycling waste concrete broken fine particles
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  • Method for recycling waste concrete broken fine particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0018] The waste concrete obtained after scientific research and testing in the laboratory is used, and the fine aggregate is natural river sand. The waste concrete is first crushed by the jaw crusher, and then sieved into recycled aggregate with a particle size above 2.5mm and crushed fine particles below 2.5mm. River sand is used as the main raw material for sand entrainment. Quicklime, aluminum powder, gypsum, and tea saponin foam stabilizers are all obtained from Hangzhou Aerated Concrete Plant. Cement is purchased from Qianchao Cement Plant with a strength grade of 42.5.

[0019] The design strength and density grades of air-entrained concrete are A2.5 and B05. First, waste concrete crushed fine particles, quartz sand and water are added to the ball mill according to the proportions in Examples 1 to 3 in Table 1, and ball milled for 2 hours, wherein the water consumption is the water consumption before "+" in Table 1, and the slurry obtained by ball milling Add cement, q...

Embodiment 3～5

[0024] The waste concrete obtained after scientific research and testing in the laboratory is used, and the fine aggregate is natural river sand. The waste concrete is first crushed by the jaw crusher, and then sieved into recycled aggregate with a particle size above 2.5mm and crushed fine particles below 2.5mm. River sand is used as the main raw material for sand entrainment. Quicklime, aluminum powder, gypsum, and tea saponin foam stabilizers are all obtained from Hangzhou Aerated Concrete Plant. Cement is purchased from Qianchao Cement Plant with a strength grade of 42.5.

[0025] The design strength and density grades of air-entrained concrete are A2.5 and B05. First, waste concrete crushed fine particles, quartz sand and water are added to the ball mill according to the proportions in Examples 6 to 8 in Table 2, and ball milled for 1 hour, wherein the water consumption is the water consumption before "+" in Table 2, and the slurry obtained by ball milling Add cement, qu...

Embodiment 6～10

[0030] The waste concrete obtained after scientific research and testing in the laboratory is used, and the fine aggregate is natural river sand. The waste concrete is first crushed by the jaw crusher, and then sieved into recycled aggregate with a particle size above 2.5mm and crushed fine particles below 2.5mm. River sand is used as the main raw material for sand entrainment. Quicklime, aluminum powder, gypsum, and tea saponin foam stabilizers are all obtained from Hangzhou Aerated Concrete Plant. Cement is purchased from Qianchao Cement Plant with a strength grade of 42.5.

[0031] The design strength and density grades of air-entrained concrete are A3.5 and B06. First, waste concrete crushed fine particles, quartz sand and water are added to the ball mill according to the proportions in Examples 6 to 10 in Table 3, and ball milled for 3 hours, wherein the water consumption is the water consumption before "+" in Table 3, and the slurry obtained by ball milling Add cement, ...

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Abstract

The invention discloses a method for recycling waste concrete broken fine particles, comprising the following steps: (1) breaking and screening the waste concrete to obtain recycled aggregate the particle size of which is more than 2.5mm and recycled fine particle the particle size of which is less than 2.5mm; (2) mixing the recycled fine particle obtained in the step (1) with quartz sand and water in proportion, ball-milling in a ball grinding mill for 1-3h to grind into slurry; (3) adding cement, ground quick lime and water with the temperature of 50-60 DEG C into the slurry, and stirring for 1-2min; and then adding aluminite powder and foam stabilizer, and continuously stirring for 0.5-1min; and (4) pouring the slurry obtained in the step (3), carrying out convalesce for 3-5h at the condition of 55-60 DEG C after pouring to generate gas, turning, cutting, steaming, pressing and maintaining for 8-10h under the atmospheric pressure of 1.5-1.8 MPa to obtain the aerated concrete product after being taken out from a kettle. The method of the invention realizes high added value recycling of the waste concrete broken fine particles.

Description

(1) Technical field [0001] The invention relates to a recycling method for broken fine particles of waste concrete, which belongs to the technical field of building material production. (2) Background technology [0002] At present, my country is in the peak period of infrastructure construction. With the construction of large-scale new concrete buildings and the demolition of waste buildings, according to conservative estimates, my country produces nearly 100 million tons of waste concrete every year; while the annual production of waste concrete in the world is as high as More than 1 billion tons. The disposal of these waste concrete not only occupies a large amount of land resources, but also causes secondary pollution to water sources, soil and air, which has become a major social and environmental problem. In order to solve this problem, researchers at home and abroad have carried out a lot of research work to realize the recycling of waste concrete. The main technical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/10C04B18/16
CPCY02W30/91
Inventor 孔德玉姜俊王晓栋
Owner ZHEJIANG UNIV OF TECH
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