Low-carbon green ultra-high performance concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high energy consumption, high pollution discharge, high cost, etc., to reduce the amount of cement and solve the problem of large shrinkage , Improve the effect of compactness

Inactive Publication Date: 2022-04-19
建研建硕(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-carbon green ultra-high-performance concrete and its preparation method. The invention uses recycled construction waste materials to prepare ultra-high-performance concrete, which solves the high energy consumption, high cost, and high pollution of existing ultra-high-performance concrete. emissions problem

Method used

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preparation example Construction

[0033] In the present invention, the preparation method of the regenerated red brick powder preferably includes: removing soil from the red bricks from construction waste to obtain red bricks after soil removal; performing primary crushing and secondary crushing on the red bricks after soil removal in sequence , to obtain red bricks; grinding the red bricks to obtain regenerated red brick powder. In the present invention, the method for removing soil is preferably passing through a 10mm sieve. In the present invention, a jaw crusher is preferably used for primary crushing of the red bricks after soil removal. In the present invention, the particle size of the red brick obtained after the primary crushing is preferably ≤150 mm, more preferably 120 mm. The present invention preferably uses a hammer crusher for secondary crushing. In the present invention, the particle size of the red brick obtained after the secondary crushing is preferably ≤70mm, more preferably 50mm. In the...

Embodiment 1

[0066] The low-carbon green ultra-high performance concrete of the present embodiment is prepared from the following raw materials in parts by weight:

[0067] 650 parts of ordinary Portland cement, 250 parts of recycled red brick powder, 100 parts of fly ash, 100 parts of silica fume, 650 parts of natural sand, 450 parts of recycled red brick sand, 180 parts of steel fiber, polycarboxylic acid high-performance water reducing 45 parts of agent, 180 parts of water.

[0068] Preparation:

[0069] Pre-wet the regenerated red brick sand until it is saturated and dry to obtain the pre-wet regenerated red brick sand; add cement, fly ash, recycled red brick powder, natural sand and silica fume into the forced mixer and dry mix for 120s to obtain the mixed dry material ; Add water and polycarboxylate high-performance water reducer evenly to the above mixed dry material, and stir for 180s to obtain a mixed wet material; slowly add pre-wet regenerated red brick sand to the above mixed ...

Embodiment 2

[0071] The low-carbon green ultra-high performance concrete of the present embodiment is prepared from the following raw materials in parts by weight:

[0072] 550 parts of ordinary Portland cement, 350 parts of recycled red brick powder, 100 parts of fly ash, 100 parts of silica fume, 650 parts of natural sand, 450 parts of recycled red brick sand, 180 parts of steel fiber, polycarboxylate high-performance water reducing 45 parts of agent, 180 parts of water.

[0073] Preparation:

[0074] Pre-wet the regenerated red brick sand until it is saturated and dry to obtain the pre-wet regenerated red brick sand; add cement, fly ash, recycled red brick powder, natural sand and silica fume into the forced mixer and dry mix for 120s to obtain the mixed dry material ; Add water and polycarboxylate high-performance water reducer evenly to the above mixed dry material, and stir for 180s to obtain a mixed wet material; slowly add pre-wet regenerated red brick sand to the above mixed wet ...

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Abstract

The invention provides low-carbon green ultra-high performance concrete and a preparation method thereof, and relates to the technical field of building materials. The low-carbon green ultra-high performance concrete provided by the invention is prepared from the following preparation raw materials in parts by weight: 550 to 650 parts of cement, 250 to 350 parts of regenerated red brick powder, 100 to 200 parts of fly ash, 90 to 110 parts of silica fume, 550 to 650 parts of natural sand, 450 to 550 parts of regenerated red brick sand, 40 to 50 parts of an additive, 160 to 180 parts of steel fiber and 170 to 190 parts of water. The problems of stacking and discarding of the construction waste red bricks are solved, the waste red bricks are subjected to processing of the regenerated red brick powder and the regenerated red brick sand, the problem of resource utilization is solved, and environmental protection benefits are improved. Meanwhile, the problems that existing ultra-high performance concrete is large in shrinkage, high in energy consumption, high in cost and poor in environmental protection property are solved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a low-carbon green ultra-high performance concrete and a preparation method thereof. Background technique [0002] Ultra-high performance concrete, or UHPC for short, is now widely used in buildings, roads and footbridges, and other structures. At present, the active fine powder for UHPC production is mainly cement, silica fume and quartz powder, among which the content of silica fume is more than 25%, and that of quartz powder is more than 30%. The fine aggregate is made of finely ground quartz sand. These raw materials not only consume natural resources and Destroying the ecological environment, and its production process is very complicated and the cost is high. [0003] With the continuous expansion of the city, a large number of existing buildings are facing demolition, resulting in a large amount of construction waste. At present, construction waste is generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B20/02
CPCC04B28/04C04B18/16C04B20/026C04B2111/00017C04B2201/50C04B18/08C04B18/146C04B14/068C04B2103/302C04B14/48C04B22/002Y02W30/91
Inventor 谢小元邢丽君冷发光张磊李柱孙佳王伟刘梦乔李赵相
Owner 建研建硕(北京)科技有限公司
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