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Recycling method of waste concrete

A waste concrete, particle size technology, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of high production cost, energy consumption, waste gas concrete recycling, etc., achieve low production cost, improve The effect of mechanical properties

Inactive Publication Date: 2009-09-23
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are also some people who crush and recycle waste concrete, but only coarse aggregates are used simply, which is not conducive to the balance of the ecological environment
At the same time, the waste concrete fines must be calcined in the later stage before they can be used, which causes a waste of energy, and the exhaust gas generated by calcination will cause the surrounding air quality to decline
Therefore, the existing technology does not completely recycle the exhaust gas concrete, consumes additional energy, is not conducive to the surrounding ecological environment and has high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of waste concrete recycling method, it comprises the following steps:

[0017] ①. Crushing the waste concrete and drying the crushed waste concrete at a drying temperature of 75°C until the water content is less than 1%;

[0018] ②. Sieve the broken waste concrete, the mesh of the sieve is ≤2.36mm;

[0019] ③. Ball mill the waste concrete fines with a particle size ≤ 2.36mm obtained in step ②. The fineness after ball milling should reach a specific surface area of ​​400m 2 / kg, used as an auxiliary cementitious material to replace part of cement and active admixtures to prepare concrete;

[0020] ④. Use the waste concrete particles with particle size>2.36mm obtained in step ② as recycled concrete aggregate.

[0021] The powder obtained in step ③ is used as an auxiliary cementitious material to replace part of the slag to prepare C30 grade concrete, and the mix ratio is as follows:

[0022]

[0023] Note: C-cement, RF-powder obtained in the present invention...

Embodiment 2

[0032] ①. Crushing the waste concrete and drying the crushed waste concrete at a drying temperature of 25°C until the water content is less than 1%;

[0033] ②. Sieve the broken waste concrete, the mesh of the sieve is ≤2.36mm;

[0034] ③. Ball mill the waste concrete fines with a particle size ≤ 2.36mm obtained in step ②. The fineness after ball milling should reach a specific surface area of ​​450m 2 / kg, used as an auxiliary cementitious material to replace part of cement and active admixtures to prepare concrete;

[0035] ④. Use the waste concrete particles with particle size>2.36mm obtained in step ② as recycled concrete aggregate.

[0036] The powder obtained in step ③ is used as an auxiliary cementitious material to replace part of the cement to prepare C30 grade concrete, and its mix ratio is as follows:

[0037]

[0038] Note: C-cement, RF-the powder obtained in the present invention; W-water; S-sand; A-gravel; Ad-water reducer

[0039] in:

[0040] Cement: 42....

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Abstract

The invention discloses a recycling method of waste concrete, comprising the following steps of: (1) carrying out crushing processing to the waste concrete, carrying out drying processing to the crushed waste concrete with the drying temperature of less than 80 DEG C; (2) carrying out screening to the crushed waste concrete with meshes of the screen being less than or equal to 2.36mm; (3) carrying out ball milling to the crushed fine waste concrete obtained by the step (2) and with the particle size of not more than 2.36mm, obtaining the powder with the specific surface area of fineness being larger than or equal to 300m<2> / kg after ball milling; and (4) adopting the waste concrete particles obtained by the step (2) and with the particle size of larger than 2.36mm as recycled concrete aggregate. Compared with the similar product in the prior art, the recycling method can completely recycle the waste concrete, is beneficial to ecological balance of the ambient environment, can achieve use requirements without calcination, does not need extra resource for consumption and has low production cost.

Description

Technical field: [0001] The invention relates to a recycling method for waste concrete. Background technique: [0002] With the acceleration of urbanization and industrialization in my country, the peak period of waste concrete discharge in China has arrived. Many concrete buildings and structures need to be demolished for redesign and construction, and these demolished waste concrete are often not treated properly. If the disposal method is outdated, it will inevitably affect the ecological environment, which is not conducive to ecological balance and cause serious environmental problems. However, waste concrete contains a large amount of hardened cement paste and unhydrated cement paste. These slurries have certain hydration activity. After being ground into powder, they can still undergo secondary hydration to form hydration products such as gel or calcium hydroxide, and the original hydration products contain a large amount of Ca(OH) 2 , thus discarding it will cause a wa...

Claims

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Application Information

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IPC IPC(8): C04B18/16
CPCC04B18/16Y02W30/91C04B20/026
Inventor 孙家瑛陈霞菁
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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