Synthetic fiber concrete and preparation method thereof

A synthetic fiber and concrete technology, applied in the field of building materials, can solve the problem of not improving the bending toughness and so on.

Inactive Publication Date: 2021-12-03
CHINA TEST & CERTIFICATION INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking the addition of monofilament fibers in concrete as an example, according to engineering experience, monofilament fibers can be well dispersed in concrete with an addition amount of 0.9kg / m 3 , however, add 0.9kg / m in concrete 3 The monofilament fiber can not improve the bending toughness at all. Therefore, it is necessary to further increase the amount of monofilament fiber in concrete, and in order to disperse more monofilament fiber in concrete, it is necessary to Need to add dispersant

Method used

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  • Synthetic fiber concrete and preparation method thereof
  • Synthetic fiber concrete and preparation method thereof
  • Synthetic fiber concrete and preparation method thereof

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preparation example Construction

[0042] The embodiment of the present application also provides a preparation method of synthetic fiber concrete, comprising the following steps:

[0043] Step 1. Pour the concrete base material and the synthetic fiber into a mixing device, and dry mix at a preset speed for a first preset time to obtain a premix.

[0044] In step 1, the raw materials except water are dry-mixed in advance, so that the synthetic fibers are broken up by dry mixing, and then distributed in the premix as evenly as possible, and at the same time, the concrete base material and synthetic fibers are mixed. Friction makes the surface of the synthetic fiber rough and improves the bonding performance between the synthetic fiber and the cementitious material in the concrete base.

[0045]This application does not limit the first preset duration of dry mixing. In one implementation, dry mixing can be performed at a preset speed of 47r / min for 30-60s. If the duration of dry mixing exceeds 60s, it will damage...

Embodiment 1

[0065] In embodiment one, mix 0.9kg / m in concrete 3 Synthetic fiber, from the test results, the equivalent bending strength is 1.7MPa, and the toughness index is 3.1.

[0066] From the analysis of Comparative Example 1 and Example 1, it can be seen that under the condition of the same fiber content, the toughness index of the prepared concrete reaches 3.1, which meets the toughness index requirement by using the synthetic fiber provided by the application instead of the monofilament fiber. Combined with Comparative Example 4, it can be seen that only 0.9kg / m 3 The synthetic fiber provided by this application can prepare concrete with a toughness index that meets the requirements without adding a dispersant, which is a technical effect that cannot be realized at present.

Embodiment 2

[0067] In embodiment two, the mixing amount of synthetic fiber in concrete is promoted to 1.8kg / m 3 , From the test results, the equivalent bending strength is increased to 2.9MPa, and the toughness index is increased to 6.1.

[0068] Analysis embodiment one and embodiment two can know, 1.8kg / m 3 The dispersibility of the added amount of synthetic fibers in the concrete is still very good, so that the toughness index of the prepared concrete reaches 6.1.

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Abstract

The invention discloses synthetic fiber concrete and a preparation method thereof.The synthetic fiber concrete is doped with 0.9-2.0 kg / m3 of synthetic fiber, and the synthetic fiber comprises a fiber trunk and fiber branches arranged at intervals in the length direction of the fiber trunk. The diameter of the fiber trunk is 2-10 times that of the fiber branches, and the length of the fiber trunk is 3.1-3.4 times that of the fiber branches. The bending toughness of the concrete can meet certain requirements under the condition that 0.9 kg / m3 of synthetic fibers are doped only by changing the shape and structure of the fibers doped into the concrete without adding other dispersing agents with a dispersing effect.

Description

technical field [0001] The application belongs to the technical field of building materials, and in particular relates to a synthetic fiber concrete and a preparation method thereof. Background technique [0002] Synthetic fiber concrete is a general term for composite materials composed of synthetic fibers and concrete base materials. Concrete base materials (such as: cement, stone, mortar) have the disadvantages of low tensile strength, low ultimate elongation, and brittleness. Adding synthetic fibers, These shortcomings can be overcome, synthetic fibers can improve the bending toughness of concrete, therefore, synthetic fiber concrete is widely used in construction. [0003] However, in the prior art, a certain amount of dispersant must be added at the same time as synthetic fibers are added to the concrete, so as to improve the bending toughness of the concrete. Taking the addition of monofilament fibers in concrete as an example, according to engineering experience, mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B14/06C04B14/02C04B16/0633C04B16/0658C04B16/0691C04B16/0641C04B16/0675
Inventor 王阳蒋玉川王文卓吴文军王清赵宝铖王孟奇郭春霞岳汉威孟园园高杨春刘娟杨昆
Owner CHINA TEST & CERTIFICATION INT GRP CO LTD
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