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Ultrahigh-toughness concrete and preparation method thereof

A technology of ultra-high toughness and concrete, applied in the field of concrete, can solve the problems of large fatigue deformation and achieve high compressive strength, lower water-cement ratio, and high toughness

Active Publication Date: 2015-04-29
GUANGDONG GUANSHENG CIVIL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the flexural strength of the concrete disclosed in the above-mentioned patent has been improved to a certain extent, in some specific engineering fields, such as steel bridge deck pavement, due to its large fatigue deformation, the existing concrete is difficult to meet the requirements. Therefore, Urgent need to study a higher toughness concrete material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing ultra-high toughness concrete includes the following steps:

[0041] 1) Prepare the raw materials according to the formula: 1 part of cement, 0.1 part of silica fume, 0.05 part of slag, 0.05 part of fly ash, 0.3 part of quartz powder, 1 part of quartz sand, 1.5% of the total volume of concrete The first steel fiber, the second steel fiber with a volume content of 2% of the total volume of the concrete, 0.03 parts of nano calcium carbonate, 0.22 parts of water, and 0.01 parts of water reducing agent;

[0042] 2) First, add the cement, silica fume, fly ash, slag, quartz powder, quartz sand, nano-calcium carbonate, water reducing agent, first steel fiber, and second steel fiber to the mixing device to stir and stir. After uniformity, add formula amount of water for mixing and fluidization, control mixing speed 20-48r / min, mixing time 4-8min, you can get ultra-high toughness concrete.

[0043] In this example, the tricalcium aluminate (C 3 A) The content is...

Embodiment 2

[0046] A method for preparing ultra-high toughness concrete includes the following steps:

[0047] 1) Prepare the raw materials according to the formula: 1 part of cement, 0.2 part of silica fume, 0.02 part of slag, 0.05 part of fly ash, 0.35 part of quartz powder, 0.8 part of quartz sand, 1.0% of the total volume of concrete The first steel fiber, the second steel fiber with a volume content of 2.5% of the total volume of the concrete, 0.03 parts of nano calcium carbonate, 0.20 parts of water, and 0.014 parts of water reducing agent;

[0048] 2) First, add the cement, silica fume, fly ash, slag, quartz powder, quartz sand, nano-calcium carbonate, water reducing agent, first steel fiber, and second steel fiber to the mixing device to stir and stir. After uniformity, add formula amount of water for mixing and fluidization, control mixing speed 20-48r / min, mixing time 4-8min, you can get ultra-high toughness concrete.

[0049] Others are the same as in Example 1.

[0050] According to ...

Embodiment 3

[0052] A method for preparing ultra-high toughness concrete includes the following steps:

[0053] 1) Prepare the raw materials according to the formula: 1 part of cement, 0.1 part of silica fume, 0.15 part of slag, 0.1 part of fly ash, 0.38 part of quartz powder, 1 part of quartz sand, the volume of which is 1.5% of the total volume of concrete The first steel fiber, the second steel fiber with a volume content of 2% of the total volume of the concrete, 0.01 part of nano calcium carbonate, 0.28 part of water, and 0.015 part of water reducing agent;

[0054] 2) First, add the cement, silica fume, fly ash, slag, quartz powder, quartz sand, nano-calcium carbonate, water reducing agent, first steel fiber, and second steel fiber to the mixing device to stir and stir. After uniformity, add formula amount of water for mixing and fluidization, control mixing speed 20-48r / min, mixing time 4-8min, you can get ultra-high toughness concrete.

[0055] Others are the same as in Example 1.

[0056...

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Abstract

The invention discloses an ultrahigh-toughness concrete and a preparation method thereof. The ultrahigh-toughness concrete mainly comprises cement, silica fume, mineral slag, fly ash, quartz powder, quartz sand, steel fiber, nano calcium carbonate, water and a water reducing agent. The weight ratio of the silica fume to the cement is (10-20):100; the weight ratio of the mineral slag to the cement is (1-20):100; the weight ratio of the fly ash to the cement is (5-20):100; the weight ratio of the quartz powder to the cement is (30-38):100; the weight ratio of the quartz sand to the cement is (80-150):100; the steel fiber accounts for 2.0-4 vol% of the concrete; the weight ratio of the calcium carbonate to the cement is (0.1-5):100; the water-binder ratio is 0.16-0.22; and the weight ratio of the water reducing agent to the cement is (0.5-4):100. The concrete has the advantages of high strength, high toughness and favorable workability; the slump is greater than or equal to 180mm; and the concrete is pumpable and can be cast in place.

Description

Technical field [0001] The invention relates to a concrete, in particular to an ultra-high toughness concrete and a preparation method thereof. Background technique [0002] As the most widely used building material in the world today, concrete has the disadvantages of low flexural strength and high brittleness, which leads to cracks or even fractures in concrete in use, which seriously affects the overall safety and service life of the building. There are a large number of building structures and parts in modern buildings, such as high-speed rail viaducts, long-span sea-crossing and river-crossing bridge decks, and subways and other types of tunnel arch walls. Due to the complex and harsh stress environment, the bending strength must be used to maximize the strength. Potentially high toughness concrete material. In order to improve the toughness of concrete, steel bars have been adopted earlier and have been used in large quantities. After that, various fiber materials with be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/48C04B18/30C04B14/28
CPCY02W30/91
Inventor 黄政宇邵旭东肖礼经周志敏
Owner GUANGDONG GUANSHENG CIVIL ENG TECH
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