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Recycled aggregate strengthened treatment method

A recycled aggregate and strengthening treatment technology, applied in the field of building materials, can solve the problems of poor quality, waste that cannot be effectively recycled, high water absorption, etc., to achieve performance improvement, increase strength, and reduce water absorption.

Inactive Publication Date: 2018-07-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The technical problem to be solved by the present invention is to provide a method for intensified treatment of recycled aggregates, which solves the problems of aging cement mortar attached to the surface of recycled aggregates, high water absorption, poor quality, and unavailable waste generated during the treatment process. The problem with efficient recycling

Method used

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Embodiment 1

[0037] A method for intensified treatment of recycled aggregates: soak recycled aggregates in dilute acetic acid solution with a mass concentration of 0.6% for 36 hours, remove the recycled aggregates after soaking to dry naturally, and stack them for later use to obtain enhanced regeneration aggregate. Precipitate the turbid waste liquid after soaking, and let it stand for 24 hours to obtain clarified liquid and regenerated slag. After drying the regenerated slag naturally, grind it for 5 minutes until the specific surface area is 300m 2 / kg spare.

Embodiment 2

[0039] A method for intensified treatment of recycled aggregates: soak recycled aggregates in dilute acetic acid solution with a mass concentration of 1.8% for 12 hours, remove the recycled aggregates after soaking, dry them naturally, and stack them for later use to obtain enhanced regeneration aggregate. Precipitate the turbid waste liquid after soaking, and let it stand for 168 hours to obtain clarified liquid and regenerated slag. After drying the regenerated slag naturally, grind it for 10 minutes until the specific surface area is 500m 2 / kg spare.

Embodiment 3

[0041] A method for intensive treatment of recycled aggregates: soak the recycled aggregates in a dilute acetic acid solution with a mass concentration of 1.2% for 24 hours, remove the recycled aggregates after soaking, dry them naturally, and stack them for later use to obtain enhanced regeneration aggregate. Precipitate the turbid waste liquid after soaking, and let it stand for 96 hours to obtain clarified liquid and regenerated slag. After drying the regenerated slag naturally, grind it for 8 minutes until the specific surface area is 400m 2 / kg spare.

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Abstract

The invention relates to a recycled aggregate strengthened treatment method. The method comprises steps as follows: (1) recycled aggregate is put in a diluted acetic acid solution to be soaked for 12-36 h; (2) after soaking ends, the soaked recycled aggregate is fished out, naturally aired and stacked for later use; (3) the turbid waste liquid obtained after soaking is settled, a clarified liquidand recycled residues are obtained, and the recycled residues are naturally aired and ground for later use; (4) the clarified liquid is used as concrete mixing water, the recycled residues are used asfiller to be mixed with the concrete. Firstly, the surface of the recycled aggregate is treated with diluted acetic acid, the performance of the recycled aggregate is effectively improved, residue liquids produced during acid treatment are reasonably used in mixing production of the concrete, no remaining waste is produced, the problems of poor quality and low utilization rate of the recycled aggregate are effectively solved, the residue liquids are used in the concrete and have small influence on the performance of the concrete, the working performance of the concrete can be improved to a certain extent, and the strength can be improved. Compared with existing recycled aggregate strengthening methods, the method is safe, low in energy consumption and full in utilization.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for reinforcing recycled aggregates. Background technique [0002] With the widespread popularization and application of modern new technologies, the process of industrialization worldwide is accelerating, and resource consumption and environmental damage are becoming increasingly serious. As the most widely used construction material, concrete has two major negative impacts on the environment. On the one hand, the manufacture of concrete consumes a lot of natural resources. For example, the current concrete industry requires more than 20 billion tons of coarse material (coarse) per year, and this demand will double in the next 20 to 30 years. On the other hand, all the concrete produced is demolished sooner or later, resulting in a lot of construction and demolition (C&D) waste, especially concrete waste. Waste concrete accounts for the largest proportion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B22/00C04B18/16
CPCC04B20/023C04B20/026C04B22/0046C04B18/16Y02W30/91
Inventor 张亚梅潘子云王家来孙超
Owner SOUTHEAST UNIV