Method for recycling fresh scrapped concrete

A technology of concrete and recycled concrete, which is applied in the field of civil engineering, can solve the problems of lack of recycling of fresh and scrapped concrete, and achieve the effect of super long workability retention time

Active Publication Date: 2019-11-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for

Method used

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  • Method for recycling fresh scrapped concrete
  • Method for recycling fresh scrapped concrete
  • Method for recycling fresh scrapped concrete

Examples

Experimental program
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Embodiment 1

[0139] Fresh scrap concrete was taken as unqualified fresh concrete, and the selected raw materials and mix ratio were the same as the fresh concrete prepared in the comparative example. The selected fresh scrapped concrete should ensure that its strength grade is not lower than the strength grade of the target recycled concrete, and ensure that the time interval between the completion of mixing of fresh scrapped concrete and the addition of dormant agent is ≤ 6h, and that it has a slump that matches its strength grade , specifically, the strength grade of fresh scrap concrete is C45, and the detection volume of the slump matching its strength grade is 2.0L.

[0140] According to the time interval between the completion of mixing of fresh scrapped concrete and the time required for recycling, that is, the standing time, the dormancy type of fresh scrapped concrete is determined as short-term dormancy or long-term dormancy. In this embodiment, the standing time of fresh scrap c...

Embodiment 2

[0145] Fresh scrap concrete was taken as unqualified fresh concrete, and the selected raw materials and mix ratio were the same as the fresh concrete prepared in the comparative example. The selected fresh scrapped concrete should ensure that its strength grade is not lower than the strength grade of the target recycled concrete, and ensure that the time interval between the completion of mixing of fresh scrapped concrete and the addition of dormant agent is ≤ 6h, and that it has a slump that matches its strength grade , specifically, the strength grade of fresh scrap concrete is C45, and the detection volume of the slump matching its strength grade is 2.0L.

[0146] According to the time interval between the completion of mixing of fresh scrapped concrete and the time required for recycling, that is, the standing time, the dormancy type of fresh scrapped concrete is determined as short-term dormancy or long-term dormancy. In this embodiment, the standing time of fresh scrap c...

Embodiment 3

[0151] Fresh scrap concrete was taken as unqualified fresh concrete, and the selected raw materials and mix ratio were the same as the fresh concrete prepared in the comparative example. The selected fresh scrapped concrete should ensure that its strength grade is not lower than the strength grade of the target recycled concrete, and ensure that the time interval between the completion of mixing of fresh scrapped concrete and the addition of dormant agent is ≤ 6h, and that it has a slump that matches its strength grade , specifically, the strength grade of fresh scrap concrete is C45, and the detection volume of the slump matching its strength grade is 2.0L.

[0152] According to the time interval between the completion of mixing of fresh scrapped concrete and the time required for recycling, that is, the standing time, the dormancy type of fresh scrapped concrete is determined as short-term dormancy or long-term dormancy. In this embodiment, the standing time of fresh scrap c...

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Abstract

The invention provides a method for recycling fresh scrapped concrete. The method comprises the following steps: S1, providing the fresh scrapped concrete; S2, determining the dormancy type of the fresh scrapped concrete; S3, carrying out dormancy treatment on the fresh scrapped concrete with the determined dormancy type; S4, awakening the dormancy-treated fresh scrapped concrete; and S5, recycling the awakened fresh scrapped concrete to form recycled concrete. The method for recycling the fresh scrapped concrete adopts different treatment ways for different dormancy types, enhances the control power of the concrete dormancy time, reduces environmental pollution, improves the recycling rate and reduces the construction cost, and the prepared recycled concrete has excellent mechanical properties, workability and durability.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and relates to a recycling method for fresh scrapped concrete. Background technique [0002] With the rapid development of the ready-mixed concrete industry, ready-mixed concrete has become one of the building materials with the widest application range and the largest average annual consumption in the field of construction. The unqualified concrete produced during the production process of commercial concrete mixing stations and the fresh waste concrete that cannot be simply processed and reused due to other reasons, this part of the concrete can be collectively referred to as fresh waste concrete because it has not yet set or has just set. [0003] At present, there are three main treatment methods for these fresh scrapped concrete: 1. Separating and recycling the concrete through the sand and gravel separator to recycle the sand and gravel, waste slurry and waste water in the concrete...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B18/16
CPCC04B18/167C04B20/023Y02W30/91
Inventor 肖建庄韩女朱冀栋段珍华
Owner TONGJI UNIV
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