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A hybrid fiber reinforced toughened high-strength self-compacting concrete and its preparation method

A self-compacting concrete and hybrid fiber technology, which is applied in the field of concrete to achieve the effects of improving fluidity, increasing fluidity and improving pore structure

Active Publication Date: 2021-08-24
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a hybrid fiber reinforced toughened high-strength self-compacting concrete and its preparation method to solve the disadvantage that the self-compacting concrete prepared in the prior art cannot improve the basic mechanical properties of concrete while improving its bending toughness

Method used

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  • A hybrid fiber reinforced toughened high-strength self-compacting concrete and its preparation method
  • A hybrid fiber reinforced toughened high-strength self-compacting concrete and its preparation method
  • A hybrid fiber reinforced toughened high-strength self-compacting concrete and its preparation method

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0031] A hybrid fiber-reinforced toughened high-strength self-compacting concrete, in which 0.03% to 0.09% of the volume of the concrete matrix is ​​mixed with nano-carbon fibers and 0.6% to 0.9% of the volume of the concrete matrix is ​​copper-coated microwire steel fibers. The weight fraction is composed of: per 100 parts of concrete matrix, 35-37 parts of coarse aggregate, 31-33 parts of fine aggregate, 17-18 parts of cement, 4-6 parts of fly ash, 2-3 parts of silica fume, water reducing 0.4-0.6 parts of agent and 5-7 parts of water.

[0032] In the aforementioned hybrid fiber reinforced and toughened high-strength self-compacting concrete, the volume content of the nano-carbon fibers is 0.03% to 0.09%. When the volume content of the nano-carbon fibers exceeds the upper limit of the above range, the fibers will be unevenly dispersed and cannot Play a good role in modifying. The volume content of the copper-coated microwire steel fiber is 0.6% to 0.9%. When the volume conte...

Embodiment 1

[0042] Compressive strength test: In this embodiment, 5 groups of test pieces were made, of which 1 group without adding any fiber was used as the control group, and 4 groups of fiber concrete were used as the test group. The weight fraction of matrix concrete is as follows: per 100 parts of concrete, 36 parts of coarse aggregate, 32 parts of fine aggregate, 18 parts of cement, 5 parts of fly ash, 2.5 parts of silica fume, 0.5 parts of water reducing agent and 6 parts of water.

[0043] The compressive strength test uses a cube with a side length of 100mm, and each group makes 6 specimens. The test groups and test results are as follows:

[0044]

[0045] From the test data in the table, it can be seen that the present invention can give full play to the beneficial effect of the hybrid fiber through appropriate raw material and hybrid fiber ratio, thereby greatly improving the cubic compressive strength of concrete, which is 16.86% and 11.97% higher than ordinary concrete resp...

Embodiment 2

[0047] Splitting tensile strength: In this embodiment, 5 groups of test pieces were made, of which 1 group without adding any fiber was used as the control group, and 4 groups of fiber concrete were used as the test group.

[0048] The matrix concrete mix ratio is the same as in Example 1.

[0049] The splitting tensile strength test uses a cube with a side length of 100mm, and each group makes 6 specimens. The test groups and test results are as follows:

[0050]

[0051]

[0052] As can be seen from the test data in the table, the present invention can give full play to the beneficial effect of the hybrid fiber through appropriate raw material and hybrid fiber ratio, thereby greatly improving the splitting tensile strength of concrete, which is 29.17% higher than ordinary concrete, respectively. 50.93%, 47.39%, and 57.00%.

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Abstract

The invention relates to a hybrid fiber-reinforced toughened high-strength self-compacting concrete and a preparation method thereof. The invention belongs to the technical field of concrete, and solves the disadvantage that the conventionally prepared self-compacting concrete cannot improve the basic mechanical properties of the concrete while improving its bending toughness. The concrete is mixed with nano-carbon fiber and copper-plated micro-wire steel fiber, and the compression resistance, splitting, flexural strength and bending toughness are all significantly improved, and can be applied to over-dense reinforcement, thin-walled, Complex shapes and other structures. The preparation method is to weigh cement, fly ash, silica fume and copper-plated microwire steel fiber by weight and put them into the mixed aggregate, mix evenly, and mix nano-carbon fiber and polycarboxylate superplasticizer with a ratio of 1:2 The mass ratio is added to an appropriate amount of water, and the nano-carbon fiber mixture is obtained by ultrasonic dispersion; finally, the remaining water, polycarboxylate high-efficiency water reducer and nano-carbon fiber mixture are put into the dry material, and stirred evenly, that is, nano-carbon fiber and copper-plated microfiber Wire-steel fiber hybrid fiber-reinforced concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a reinforced and toughened self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete, by virtue of its ability to flow and compact under its own gravity, can be formed without additional vibration, solves the construction problem that is difficult to vibrate due to over-dense reinforcement, thin walls, and complex shapes. At the same time , saving labor resources and improving construction efficiency; in terms of green environmental protection, energy consumption is reduced and noise pollution caused by vibration is eliminated. Because it meets the development concept of high efficiency and energy saving in the current industry, it has attracted widespread attention. [0003] However, self-compacting concrete and ordinary concrete also have the disadvantages of poor crack resistance, poor toughness, low tensile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 王钧李婷赵金友徐嫚薛鹤李世平郭冬伟宋哲生白雪石
Owner NORTHEAST FORESTRY UNIVERSITY
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