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Fiber concrete interface modifier and modification method

A technology of fiber concrete and modifier, which is applied in the field of fiber concrete modification, can solve problems such as inability to improve fiber dispersion, difficulty in controlling reaction conditions, and complicated modification treatment methods, achieving obvious modification effects, simple configuration methods, The effect of rapid preparation

Active Publication Date: 2022-04-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006](1) The modification method is complex and expensive
Although there are many kinds of interface modifiers, which can greatly improve the bonding performance between fibers and concrete, most of the modification requires expensive equipment and the modified materials are rare, so the economy is low
Moreover, the modification treatment method is too complicated, and it is difficult to control the reaction conditions during the construction process.
[0007](2) Unable to improve fiber dispersion
Almost all fiber-reinforced concrete interfacial performance modifiers only consider enhancing the interfacial bonding performance and the durability of fibers, and have not solved the problem of poor dispersion of fibers in concrete, and there is no targeted research on modifiers

Method used

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Experimental program
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Embodiment 1

[0041] Carbon fiber (CNF) has extremely strong tensile strength at the nanoscale and is able to bridge the cracks in the concrete at the nanoscale, thereby preventing internal expansion. However, due to the strong van der Waals force, the carbon fiber soil is often entangled during the mixing process, which reduces the dispersion of carbon fibers, making it difficult to further improve the strength of carbon fiber concrete. The carbon fiber is treated with an interface modifier solution with a mass fraction of 1% tannic acid, so as to improve the dispersion of carbon fiber and improve the mechanical properties of carbon fiber cement mortar.

[0042] (1) Configure the interface modifier solution. Configuration mass fraction is 1% tannic acid solution (comprising following mass percentage components: tannic acid 1%, water 99%), and adjust pH with the sodium hydroxide solution of 0.1mol / L and hydrochloric acid solution, make pH remain at Between 3-6 and as close to 6 as possible...

Embodiment 2

[0047] Steel fiber has excellent tensile properties and ductility, and its flexural strength and toughness can be greatly improved when mixed with concrete. However, since the surface of steel fiber has no obvious reaction with concrete, its interfacial bonding performance is not enough to exert the strength of steel fiber. Due to the excellent performance of the steel fiber reinforced concrete, most of the steel fibers are pulled out when the steel fiber reinforced concrete is damaged. It is planned to treat the steel fiber with an interface modifier solution with a mass fraction of 1% tannic acid to enhance the bonding performance of the steel fiber and concrete interface, and further improve the flexural strength and toughness of the steel fiber reinforced concrete.

[0048] (1) Configure the interface modifier solution. Prepare a tannic acid solution with a mass fraction of 1%, and adjust the pH with 0.1mol / L sodium hydroxide solution and hydrochloric acid solution to keep...

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Abstract

The invention relates to a fiber concrete interface modifier and a modification method, the fiber concrete interface modifier comprises the following raw materials: water and tannic acid, the mass fraction of the tannic acid is greater than or equal to 1%, the pH value of the fiber concrete interface modifier is 3-6, and the content of the tannic acid is less than or equal to 1%. The fiber concrete interface modification method comprises the following steps: treating fibers by using the fiber concrete interface modifier, and mixing the treated fibers with concrete. Compared with the prior art, the invention can effectively enhance the chemical bonding strength of the fiber and concrete interface, enhance the durability of the fiber, improve the dispersity of the fiber in the concrete, enhance the deformability of the fiber concrete, increase the total energy absorption amount when the fiber concrete is damaged, and greatly enhance the mechanical and durability properties of the fiber concrete.

Description

technical field [0001] The invention relates to the technical field of fiber concrete modification, in particular to a fiber concrete interface modifier and a modification method. Background technique [0002] Fiber concrete has excellent mechanical properties and durability. It transmits and disperses stress through dispersed fibers, improving the integrity of concrete and the ability to work with cracks. Compared with traditional concrete, its bending resistance, toughness and durability are significantly improved, which can greatly enhance the fatigue life of concrete. It is used in highway bridges, water conservancy projects, construction projects and subway shields. Due to the good mechanical properties of fiber concrete, the design thickness of concrete can be reduced in engineering, thereby reducing the self-weight of the structure, which has good economic benefits. [0003] However, fiber reinforced concrete still has many defects, which limit the further improvemen...

Claims

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Application Information

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IPC IPC(8): C04B20/10C03C25/32C03C25/1025
CPCY02W30/91
Inventor 钱鑫凌建明赵鸿铎杨恒杨帆
Owner TONGJI UNIV