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Hybrid fiber reinforced concrete, and preparation method and application thereof

A hybrid fiber and concrete technology, applied in the field of building materials, can solve the problems of engineering application difficulties, failure to determine the fiber type and dosage parameters, and the difficulty of fiber reinforced concrete to achieve mechanical properties and working properties, and improve the splitting tensile strength. , Easy to construct quickly in large quantities, and the effect of improving uniaxial tensile toughness

Active Publication Date: 2019-02-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete with high fiber content usually produces better mechanical properties, but requires more time for pouring and vibrating as well as special construction techniques, which makes practical engineering applications difficult
The existing fiber-reinforced concrete is difficult to achieve a balance between mechanical properties and working properties. The reason is that the optimal fiber type and dosage parameters have not been determined.

Method used

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  • Hybrid fiber reinforced concrete, and preparation method and application thereof
  • Hybrid fiber reinforced concrete, and preparation method and application thereof
  • Hybrid fiber reinforced concrete, and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0086]

[0087] The first step is to determine the concrete mix ratio and fiber mixing volume ratio, that is, according to the required cement grade, use the trial mix method to determine the mix ratio of each material of the concrete, and at the same time determine the volume of the steel fiber and polyvinyl alcohol fiber mixed Compare.

[0088] The second part prepares the required materials, that is, prepares the required coarse aggregate (stone), fine aggregate (sand), cement, water, water reducing agent, steel fiber and polyvinyl alcohol according to the material mix ratio of the mixed fiber concrete fiber.

[0089] In the third step, add the above-mentioned raw materials into the mixer and mix them.

[0090] Specifically, a kind of preparation method of hybrid fiber concrete, it comprises the steps:

[0091] (1) First add the coarse aggregate into the mixer, sprinkle steel fibers during the mixing process, and stir for 1-2 minutes to obtain the first mixture;

[009...

Embodiment 1

[0107] The hybrid fiber concrete of the present embodiment comprises the following components:

[0108]

[0109] Wherein, the batching ratio and specific components of the hybrid fiber concrete in this embodiment are as follows: the water-cement ratio is 0.45, and the sand rate is 40%.

[0110] Specifically, the cement is Conch brand 42.5 grade ordinary Portland cement, with a 28-day compressive strength of 45MPa and a density of 3015kg / m 3 .

[0111] The particle size of the coarse aggregate is 10mm and the density is 2620kg / m 3 .

[0112] The fine aggregate is medium-coarse river sand with a fineness modulus of 2.3 and a density of 2640kg / m 3 , the apparent density is 2.58g / cm 3 , bulk density is 1.48×103kg / m 3 .

[0113] The steel fiber is Dramix steel fiber produced by Bekaert, the model is 3D / 65 / 50BG, the diameter is 0.75mm, the length is 36.5mm, the tensile strength is 1225MPa, and the elastic modulus is 200000MPa. The volume content in hybrid fiber concrete is...

Embodiment 2

[0122] The hybrid fiber concrete of the present embodiment comprises the following components:

[0123] A hybrid fiber concrete comprising the following components:

[0124]

[0125] Wherein, the batching ratio and specific components of the hybrid fiber concrete in this embodiment are as follows: the water-cement ratio is 0.45, and the sand rate is 40%.

[0126] Specifically, the cement is Conch brand 42.5 grade ordinary Portland cement with a 28-day compressive strength of 60MPa and a density of 3562kg / m 3 .

[0127] The particle size of the coarse aggregate is 16mm and the density is 3008kg / m 3 .

[0128] The fine aggregate is medium-coarse river sand with a fineness modulus of 3.0 and a density of 2876kg / m 3 , the apparent density is 3.02g / cm 3 , bulk density is 1.48×103kg / m 3 .

[0129]The steel fiber is Dramix steel fiber produced by Bekaert, the model is 3D / 65 / 50BG, the diameter is 0.91mm, the length is 50mm, the tensile strength is 1352MPa, and the modulus of...

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Abstract

The invention provides hybrid fiber reinforced concrete, and a preparation method and an application thereof. The hybrid fiber reinforced concrete comprises cement, a coarse aggregate, a fine aggregate, steel fibers, polyvinyl alcohol fibers, a water reducer and water. The preparation method comprises the following steps: adding the steel fibers into the coarse aggregate to obtain a first mixed material; adding the fine aggregate and cement into the first mixed material to obtain a second mixed material; adding the polyvinyl alcohol fibers into the second mixed material to obtain a third mixedmaterial; and mixing the water and the water reducer to obtain a mixed solution, and adding the mixed solution into the third mixed material to obtain the hybrid fiber reinforced concrete. The invention provides the most optimum criterion of parameters at multi-performance target, and establishes the optimum scoring system of parameters. The optimum fiber combination and doping amount are screened according to the system, that is, 1.3% by volume of steel fibers and 0.2% by volume of polyvinyl alcohol fibers are compounded. Compared with plain concrete with a same basic mix proportion, the mechanical property of the hybrid fiber reinforced concrete is enhanced obviously.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a hybrid fiber concrete and its preparation method and application. Background technique [0002] High-performance concrete refers to concrete with improved performance, and its high performance can be high strength, high durability and good working performance. The requirements for building concrete materials in the field of earthquake engineering are good strength, ductility and durability, so scholars at home and abroad have extensively conducted research on high-strength fiber concrete and high-toughness fiber concrete. High-strength fiber reinforced concrete (Fiber Reinforced Concrete, FRC) mainly refers to adding a certain amount of high-strength fibers, such as steel fibers and glass fibers, to the concrete. This fiber is characterized by high strength. When the concrete is stressed, the high-strength fibers pass through the surrounding The bonding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/02C04B14/068C04B14/48C04B16/0641C04B24/24
Inventor 周颖钟光淳肖意
Owner TONGJI UNIV
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