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Ultra-high performance concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in the field of building materials, can solve the problems of waste of materials and resources, high cost of ultra-high-performance concrete, etc., and achieve the effects of reducing damage, improving recycling efficiency, and reducing costs

Pending Publication Date: 2021-11-12
YANCHENG INST OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an ultra-high-performance concrete containing recycled coarse aggregate and its preparation method to solve the problem of high cost of ultra-high-performance concrete and construction waste caused by the use of high-strength natural aggregate and ground quartz sand in the prior art. Direct discarding of technical issues resulting in waste of materials and resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The ultra-high performance concrete containing recycled coarse aggregate of the present invention comprises the following components by weight percentage: 24% cement, 7% silica fume, 9% fly ash, 4% mineral powder, 19% ordinary river sand, recycled coarse Aggregate 25%, water reducing agent 1%, steel fiber 2.0%, water 9%.

[0028] The above-mentioned ultra-high performance concrete containing recycled coarse aggregate was prepared by the following preparation method and then tested. The preparation method is as follows:

[0029] Weigh all materials according to the above components;

[0030] Mix the weighed cement, silica fume, fly ash, and mineral powder, and stir for 1 min;

[0031] Add all the water and water reducing agent and stir for 7 minutes;

[0032] Add ordinary river sand and stir for 2 minutes;

[0033] Add steel fiber and stir for 5 minutes;

[0034] Add coarse aggregate and stir for 3 minutes to conduct slump spread test;

[0035] Pour the obtained mix...

Embodiment 2

[0042] The ultra-high performance concrete containing recycled coarse aggregate of the present invention comprises the following components in weight percent: 20% cement, 5% silica fume, 5% fly ash, 2% mineral powder, 25% ordinary river sand, recycled coarse Aggregate 30%, water reducing agent 1%, steel fiber 1.5%, water 10.5%.

[0043] The above-mentioned ultra-high performance concrete containing recycled coarse aggregate was prepared by the following preparation method and then tested. The preparation method is as follows:

[0044] Weigh all materials according to the above components;

[0045] Mix the weighed cement, silica fume, fly ash, and mineral powder, and stir for 1 min;

[0046] Add all the water and water reducing agent and stir for 5 minutes;

[0047] Add ordinary river sand and stir for 2 minutes;

[0048] Add steel fiber and stir for 5 minutes;

[0049] Add coarse aggregate and stir for 3 minutes to conduct slump spread test;

[0050] Pour the obtained mix...

Embodiment 3

[0057] The ultra-high performance concrete containing recycled coarse aggregate of the present invention comprises the following components by weight percentage: 25% cement, 10% silica fume, 10% fly ash, 5% mineral powder, 13% ordinary river sand, recycled coarse Aggregate 25%, water reducing agent 1%, steel fiber 2.5%, water 8.5%.

[0058] The above-mentioned ultra-high performance concrete containing recycled coarse aggregate was prepared by the following preparation method and then tested. The preparation method is as follows:

[0059] Weigh all materials according to the above components;

[0060] Mix the weighed cement, silica fume, fly ash, and mineral powder, and stir for 1 min;

[0061] Add all the water and water reducing agent and stir for 7 minutes;

[0062] Add ordinary river sand and stir for 2 minutes;

[0063] Add steel fiber and stir for 5 minutes;

[0064] Add coarse aggregate and stir for 3 minutes to conduct slump spread test;

[0065] Pour the obtained...

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Abstract

The invention discloses ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of building materials. The ultra-high performance concrete comprises the following components in percentage by weight: 30%-50% of a cementing material, 12%-25% of common river sand, 20%-30% of recycled coarse aggregate, 0.5%-1.0% of a water reducing agent, 1.5%-2.5% of steel fibers and the balance of water. The recycled aggregate is used for partially or completely replacing high-strength natural aggregate, and the common river sand is used for replacing ground quartz sand, so that the ultra-high performance concrete with the performance meeting the requirements can be prepared, and the cost is reduced.

Description

technical field [0001] The invention relates to an ultra-high performance concrete and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] With the continuous development and improvement of the urbanization process, the amount of concrete is also increasing year by year, gradually becoming the most used building material. With the continuous development of building forms or building structures, the performance requirements of concrete are getting higher and higher. A new type of ultra-high performance concrete has emerged as the times require, and has gradually become the first choice for super high-rise buildings, special-shaped buildings or large bridges. One of the building materials. [0003] At present, ultra-high performance concrete can be roughly divided into two categories, one is reactive powder concrete without coarse aggregate, and the other is ultra-high performance concrete with coarse aggregate. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2111/00017C04B18/146C04B18/08C04B18/141C04B14/06C04B14/48C04B18/16C04B2103/302
Inventor 王耀张静
Owner YANCHENG INST OF IND TECH
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