Preparation method for high-quality recycled concrete aggregates

A technology of recycled concrete and recycled aggregate, applied in the field of preparation of high-quality recycled aggregate, can solve the problems of unstable indicators of recycled aggregate, affecting concrete strength, shrinkage, creep and durability, etc., to improve the peeling rate of mortar , saving land occupation, obvious environmental effect

Inactive Publication Date: 2013-10-02
GUANGXI UNIV +1
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  • Summary
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Problems solved by technology

[0003] Waste concrete in construction waste is the key object of resource utilization, and recycled aggregate is its product. However, unequal amounts of mortar adhere to the surface of recycled aggregate, which leads to unstable indicators of recycled aggregate and affects the configured concrete. Therefore, how to effectively remove the mortar adhering to the surface of the primary aggregate and obtain cleaner aggregate is the key difficulty of the whole technology

Method used

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  • Preparation method for high-quality recycled concrete aggregates
  • Preparation method for high-quality recycled concrete aggregates
  • Preparation method for high-quality recycled concrete aggregates

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preparation example Construction

[0039] like Figure 9 Shown, the preparation method of high-quality recycled concrete aggregate of the present invention comprises the following steps:

[0040] 1. Sorting, using manual sorting to remove wood, paper, metal, and plastic materials from construction waste;

[0041] 2. Hammering, the purpose of hammering is to break the waste concrete into small pieces;

[0042] 3. For primary crushing, the waste concrete blocks after hammering are crushed with a suitable jaw crusher according to the particle size range of recycled aggregates. The output of aggregates with a particle size of 5-40mm after crushing is controlled at 80-90%. ;

[0043] 4. First-level screening, use a lifting sieve with a sieve hole of 5mm to screen the waste concrete aggregate after the first-level crushing;

[0044] 5. Grinding. Send the sieved aggregate > 5mm into the rod mill. According to the grindability of the aggregate and the amount of feed, put it into a steel rod with a suitable grade, gr...

Embodiment 1

[0050] Collect the 150×150×150mm cubic waste concrete test blocks after the strength test in the laboratory, the strength grade is C30, and the primary aggregate contains more pebbles and some crushed stones. Processed according to the steps of the method, the quality of the recycled aggregate obtained is as follows:

[0051] (1) figure 1 It is the appearance image of the test block of this strength level after the primary crushing by the PE300×500 jaw crusher. The particle size ranges from 5 to 40mm, and most of them are flat and long.

[0052] (2) figure 2 It is the appearance of coarse aggregate after being processed by a rod mill with a specification of 500×500×500mm (the combination of steel rods is 3 pieces of Φ50×150mm, 5 pieces of Φ40×150mm, and 5 pieces of Φ30×150mm) for 10 minutes. The grain shape is good, and the pebble surface The degree of mortar shedding is better.

Embodiment 2

[0054] Collect the 150×150×150mm cubic waste concrete test blocks after the strength test in the laboratory, the strength grade is C40, and the primary aggregate is basically crushed stone. Processed according to the steps of the method, the quality of the recycled aggregate obtained is as follows:

[0055] (1) image 3 It is the appearance image of the test block of this strength level after primary crushing by PE300×500 jaw crusher. The particle size ranges from 5 to 40 mm, and most of them are flat and long.

[0056] (2) Figure 4 It is the appearance of coarse aggregate after being processed by a rod mill with a specification of 500×500×500mm (the combination of steel rods is 3 pieces of Φ50×150mm, 5 pieces of Φ40×150mm, and 5 pieces of Φ30×150mm) for 10 minutes, and the grain shape is good.

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Abstract

Provided is a preparation method for high-quality recycled concrete aggregates. The preparation method comprises steps of sorting of waste concrete, primary crushing, primary screening, rod milling, secondary screening and cleaning, and then the graded aggregates are mixed according to required gradations to obtain recycled coarse aggregates with different particle sizes. According to the preparation method, the cyclic utilization rate of waste concrete can be close to 80%, the resource utilization of construction waste in cities can be realized, the secondary pollution of construction waste to the environment can be reduced, the land occupation account for landfilling of construction waste can be saved, and the industrialization development of comprehensive utilization of construction waste can be promoted to some extent.

Description

1. Technical field [0001] The invention relates to a method for processing waste concrete in construction waste, in particular to a method for preparing high-quality recycled aggregate that can be configured with medium-strength high-performance recycled aggregate concrete by using waste concrete as the main raw material. 2. Background technology [0002] Construction waste has become an inevitable product of urbanization, but because it accounts for a large proportion of urban solid waste and has low-level treatment methods, it has caused great damage to the environment and threatened the increasingly scarce natural resources. Therefore, actively promoting the reduction of construction waste and the comprehensive utilization of resources to realize the simultaneous promotion and coordinated development of economic benefits, ecological benefits and social benefits are the key directions for the sustainable development of the construction industry. [0003] Waste concrete in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 冯庆革朱惠英李贞周维李浩璇卢凌寰
Owner GUANGXI UNIV
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