Carbonization reinforced regenerated aggregate, and preparation method and applications thereof

A technology of recycled aggregate and aggregate, applied in the field of building materials, can solve the problems of micro-cracks, limited application, weak interface, etc., to achieve the effect of enhancing strength, realizing permanent storage, and reducing emissions

Inactive Publication Date: 2019-10-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The aggregate produced in this way mainly has the following two problems. One is that the aggregate is damaged during the crushing process, resulting in micro-cracks and reducing the mechanical properties of the aggregate itself. The other is that the old mortar that has not been completely removed adheres to the aggregate. There is a weak interface between the old mortar and the original aggregate, which also affects various physical properties such as strength, crushing index and water absorption.
The above problems lead to a low replacement rate of recycled aggregates for natural aggregates, or reduce the strength of recycled aggregate concrete, thus limiting the large-scale application of recycled aggregates
A large amount of clay bricks and other wastes are produced during the demolition of old buildings. The preparation of brick aggregates is also an effective way to utilize waste bricks. Brick aggregates have low density and light weight and can be used as lightweight aggregates, but their strength is low. Limit its application in light aggregates with higher strength

Method used

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  • Carbonization reinforced regenerated aggregate, and preparation method and applications thereof
  • Carbonization reinforced regenerated aggregate, and preparation method and applications thereof
  • Carbonization reinforced regenerated aggregate, and preparation method and applications thereof

Examples

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Embodiment 1

[0029] A method for preparing carbonization-enhanced recycled aggregates. In this embodiment, the construction waste is bricks, and the fine powder of the admixture is fine bricks. The specific preparation process is as follows: the bricks are crushed to obtain uniform brick aggregate particles with a particle size of 5-16 mm. Weigh 90 parts by mass of cement and 10 parts by mass of fine brick powder and mix evenly to obtain a surface wrapping material. Weigh 30 parts by mass of the surface wrapping material and 70 parts by mass of brick aggregate particles, mix them, and put them into the ball forming machine. Weigh water according to the water-cement ratio (mass ratio of water to surface wrapping material) of 0.20, spray water into the material pan of the ball forming machine, and obtain the finished brick aggregate after rolling. Put the wrapped brick aggregate into a sealed container for pre-curing, and the pre-curing time is 3 days. Then, the pre-cured brick aggregate is...

Embodiment 2

[0031] A method for preparing carbonization-enhanced recycled aggregates. In this embodiment, the construction waste is bricks, and the admixture fine powder is fly ash. The specific preparation process is as follows: the bricks are crushed to obtain uniform brick aggregate particles with a particle size of 5-16 mm. Weigh 80 parts by mass of cement and 20 parts by mass of fly ash and mix uniformly to obtain a surface coating material. Weigh 25 parts by mass of the surface wrapping material and 75 parts by mass of brick aggregate particles, mix them, and put them into the ball forming machine. Weigh water according to the water-cement ratio (mass ratio of water to surface wrapping material) of 0.20, spray water into the material pan of the ball forming machine, and obtain the finished brick aggregate after rolling. The wrapped brick aggregate is pre-cured in a sealed container, and the pre-curing time is 3 days. Then, the pre-cured brick aggregate is put into a carbonization d...

Embodiment 3

[0033] A method for preparing carbonization-enhanced recycled aggregates. In this embodiment, the construction waste is bricks, and the admixture fine powder is fly ash and muck. The specific preparation process is as follows: the bricks are crushed to obtain uniform brick aggregate particles with a particle size of 5-16 mm. Weigh 70 parts by mass of cement, 20 parts by mass of fly ash, and 10 parts by mass of muck to mix evenly to obtain a surface coating material. Weigh 25 parts by mass of the surface wrapping material and 75 parts by mass of brick aggregate particles, mix them, and put them into the ball forming machine. Weigh water according to the water-cement ratio (mass ratio of water to surface wrapping material) of 0.18, spray water into the material pan of the ball forming machine, and obtain the coated brick aggregate after rolling. The covered brick aggregate is pre-cured in a sealed container, and the pre-curing time is 7 days. Then put the pre-cured brick aggreg...

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Abstract

The invention discloses a carbonization reinforced regenerated aggregate, and a preparation method and applications thereof, and belongs to the technical field of building material. The preparation method comprises following steps: building garbage is crushed so as to obtain uniform aggregate particles; cement and admixture fine powder are weighted for uniform mixing so as to obtain a surface coated material; the prepared aggregate particles and the surface coated material are mixed, and are introduced into a granulator, water is sprayed uniformly for granulation so as to obtain a coated aggregate; the coated aggregate is introduced into a sealed environment or the natural environment for pre-curing; an aggregate obtained through pre-curing is introduced into a carbonization device for carbonization treatment so as to obtain the carbonization reinforced regenerated aggregate. The preparation method is adopted to prepare the light aggregate, so that aggregate light weight and high strength are achieved, aggregate cylinder compressive strength can be as high as 13.0MPa, and is higher than the using standard cylinder compressive strength 6.5MPa of common light aggregate. The production technology is simple; resource utilization of solid waste is realized; adsorption immobilization of carbon dioxide is realized; sintering is not needed; and low carbon emission and environment protection are realized.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a carbonized reinforced recycled aggregate and a preparation method and application thereof. Background technique [0002] With the rapid development of urban economy in recent years, a large number of building construction and demolition will inevitably bring a lot of construction waste. These construction wastes are piled up for a long time, occupying a lot of usable land, and even causing environmental pollution. On the other hand, urban development and infrastructure construction require the use of large amounts of cement, sand and gravel aggregates, bricks and other materials and concrete products, which consume a large amount of non-reproducible mineral resources and damage the environment. Using bricks, stones, and concrete blocks in construction waste (accounting for more than 80% of construction waste) into resources to produce new construction material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B18/16
CPCC04B18/16C04B20/1077C04B20/023C04B18/08Y02W30/91
Inventor 莫立武葛晓永殷伟杨硕申玲
Owner NANJING UNIV OF TECH
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