Recycled concrete and preparation method thereof

A technology of recycled concrete and recycled gravel, applied in the field of building materials, can solve the problems of high freight costs, secondary environmental pollution, greenhouse effect, etc., and achieve the effects of fast setting time, high early strength and excellent performance.

Inactive Publication Date: 2018-03-09
GUANGDONG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The traditional waste concrete treatment method is mainly to transport it to the suburbs for stacking or landfill, which not only costs a lot of freight, but also takes up a lot of valuable land resources, causing secondary pollution to the environment
At the same time, what we currently use is mainly ordinary Portland cement. In the process of its production, due to the calcination of limestone and the combustion of fossil fuels, a large amount of carbon dioxide will be produced. 2 The increase of warming substances will warm the earth's climate and lead to the greenhouse effect
Fly ash is the fine ash collected from the flue gas after coal combustion. Its storage not only takes up a lot of land, but also causes serious environmental pollution.

Method used

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  • Recycled concrete and preparation method thereof
  • Recycled concrete and preparation method thereof
  • Recycled concrete and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing recycled concrete described in the above technical solution, comprising the following steps:

[0040] a), mixing recycled crushed stone, sand, slag powder, fly ash, alkali metal hydroxide, alkali metal silicate, water and retarding water reducer to obtain concrete slurry;

[0041] b), the concrete slurry is cured and cured to obtain recycled concrete.

[0042] In the preparation method provided by the present invention, at first each raw material component is mixed to prepare concrete slurry, and specific process comprises:

[0043] a1), mixing part of the water with alkali metal hydroxide and alkali metal silicate respectively to obtain an aqueous alkali metal hydroxide solution and an aqueous alkali metal silicate solution;

[0044] a2), mixing the regenerated crushed stone with the remaining amount of water to obtain the first mixture;

[0045] a3), mixing the first mixture with slag powder, fly ash and san...

Embodiment 1

[0068] Add 1155kg of continuously graded regenerated crushed stones with a particle size of 5-10mm and 10-20mm (mixed at a mass ratio of 1:1), 69.3kg of additional water, and stir for 5 minutes in a forced mixer; add 375kg of slag powder, powder 125kg of coal ash, 495kg of river sand, stirring for 5 minutes; adding 77.51kg of sodium hydroxide solution, 193.77kg of sodium silicate solution, 7.5kg of retarding superplasticizer, and stirring for 2 minutes to obtain concrete slurry 1.

[0069] Pour the slurry into a standard plastic mold and vibrate it compactly. On the first day, the ground is watered, and the mold filled with concrete slurry is placed on the ground, covered with a plastic film, and then watered on the plastic film, watered twice a day; Remove the formwork in two days, and immediately put the concrete specimen into the high-temperature steam rapid curing box after removing the formwork, the curing temperature is 80°C, and the curing time is 24h; Take it out and p...

Embodiment 2

[0071] Add 1225kg of regenerated crushed stones (mixed according to the mass ratio of 1:1) and 73.5kg of additional water into the forced mixer, and the mixing time is 5 minutes; add 300kg of slag powder, powder 100kg of coal ash, 525kg of river sand, stirring for 5 minutes; adding 77.51kg of sodium hydroxide solution, 193.77kg of sodium silicate solution, 6kg of retarding superplasticizer, and stirring for 2 minutes to obtain concrete slurry 2. The curing method refers to Example 1, and a slag-fly ash based geopolymer recycled concrete specimen of 150mm*150mm*150mm is obtained.

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Abstract

The invention belongs to the field of building materials, and particularly relates to recycled concrete and a preparation method thereof. The recycled concrete provided by the invention is prepared from the following raw materials in parts by weight: 1000-1300 parts of regenerated gravel; 400-600 parts of sand, 100-500 parts of slag powder, 100-500 parts of fly ash, 15-25 parts of an alkali metalhydroxide, 60-75 parts of an alkali metal silicate, 240-260 parts of water, and 5-10 parts of a retarding water-reducing agent. According to the invention, the regenerated gravel and the sand are usedas aggregates, and after alkali excitation, industrial by-products such as the slag powder and the fly ash are used as cementing material binders, so that the environment-friendly concrete material with excellent usability is obtained. The concrete material not only are used to realize the effective reutilization of waste buildings and industrial wastes, but also has the advantages of short setting time, high early strength and the like, and is beneficial to popularization and application in rescue and relief work and national defense construction.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a recycled concrete and a preparation method thereof. Background technique [0002] With the continuous development of the economy, the traditional construction industry has reached an unprecedented scale. On the one hand, it has greatly accelerated the urbanization process in China, but on the other hand, high energy consumption, high pollution, high waste, and extensive on-site people The industry has brought extremely serious negative impacts on ecology, cities, and industrial structure. [0003] Construction waste often occurs in the reconstruction and demolition of old buildings in urbanization, the demolition and maintenance of municipal facilities, and the remaining waste at construction sites or building component factories, of which a considerable proportion is waste concrete. The traditional waste concrete treatment method is mainly to transport it to the suburbs for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26
CPCC04B28/26C04B2111/00017C04B2201/05C04B2201/50C04B18/167C04B14/06C04B18/141C04B18/08C04B22/062C04B2103/22C04B2103/302
Inventor 王翀昊谢建和张冰雪方驰黄亮
Owner GUANGDONG UNIV OF TECH
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