Method for manufacturing chopped carbon fiber reinforced concrete

A technology of chopped carbon fiber and reinforced concrete, which is applied in chemical instruments and methods, clay preparation devices, mixing operation control, etc., can solve the problems of difficult to disperse carbon fibers, large number of carbon fibers, etc. dispersion effect

Inactive Publication Date: 2010-05-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is: limited by the water-cement ratio, the amount of dispersant aqueous solution is too small, and the number of carbon fibers is huge, it is difficult to disperse carbon fibers

Method used

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  • Method for manufacturing chopped carbon fiber reinforced concrete
  • Method for manufacturing chopped carbon fiber reinforced concrete
  • Method for manufacturing chopped carbon fiber reinforced concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare 25 L of carboxymethylcellulose sodium aqueous solution with a mass concentration of 0.4%, and the water temperature is about 25°C. Add 10 g of PANEX35 chopped carbon fiber with a length of 6.4 mm from the Zoltek Company of the United States, and stir for 3 to 5 minutes while adding. Add a few drops of tributyl phosphate (manufactured by Wuhan Hongda Chemical Reagent Factory) while stirring, and the dosage is subject to the fact that there are no bubbles on the surface of the solution. Use filter to filter carbon fiber suspension, the total area of ​​filter is 1m 2 , The structure of the filter net is shown in Figure 1.

[0024] After drying the filter cloth with carbon fiber in the drying equipment or in the sun, remove the chopped carbon fiber felt. The quality of the carbon fiber felt is weighed by an electronic balance with a sensitivity of 0.01 g, as shown in Table 1. Therefore, the mass average of carbon fiber felt is 11.27g / m 2 , wherein the glue conte...

Embodiment 2

[0026]Prepare 50 L of hydroxypropyl methylcellulose (molecular weight is 200,000) aqueous solution with a concentration of 0.4%, and the water temperature is about 25°C. Add 10g of 5mm PAN-based chopped carbon fiber from Shanghai Carbon Co., Ltd., and stir for 3 to 5 minutes while adding. Add a few drops of tributyl phosphate (manufactured by Wuhan Hongda Chemical Reagent Factory) while stirring, and the dosage is subject to the absence of air bubbles on the surface of the dispersant solution. Use filter to filter carbon fiber suspension, the total area of ​​filter is 1m 2 , The structure of the filter net is shown in Figure 1. After drying the cloth with carbon fiber in the drying equipment or drying in the sun, remove the chopped carbon fiber mat.

[0027] Similar to Example 1, it is weighed by an electronic balance with a sensitivity of 0.01g: the average mass of carbon fiber felt is 11.48g / m 2 , the glue content is 12.9%, and the carbon fiber content is 87.1%.

Embodiment 3

[0029] Prepare 50 L of hydroxypropyl methylcellulose (molecular weight is 200,000) aqueous solution with a concentration of 0.4%, and the water temperature is about 25°C. Add 10g of 5mm PAN-based chopped carbon fiber produced by Taiwan Formosa Plastics Group, and stir for 3-5 minutes while adding. Add a few drops of tributyl phosphate (manufactured by Wuhan Hongda Chemical Reagent Factory) while stirring, and the dosage is subject to the absence of air bubbles on the surface of the dispersant solution. Use filter to filter carbon fiber suspension, the total area of ​​filter is 1m 2 , The structure of the filter net is shown in Figure 1. After drying the cloth with carbon fiber in the drying equipment or drying in the sun, remove the chopped carbon fiber mat.

[0030] Similar to Example 1, it is weighed by an electronic balance with a sensitivity of 0.01g: the average mass of the prepared carbon fiber felt is 11.35g / m 2 , the glue content is 11.9%, and the carbon fiber conte...

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Abstract

The invention relates to a method for manufacturing chopped carbon fiber reinforced concrete, particularly comprising the following steps: dispersing chopped carbon fiber in aqueous solution of water-soluble cellulose ether; adopting a papermaking method to filter the carbon fiber from carbon fiber suspension by a filter screen or a mop; taking down the dried carbon fiber from the filter screen or the mop; cutting the take-down carbon fiber felt into small blocks with side length being 4-8cm; dry mixing the small blocks with the concrete raw material for 1-4min, then adding water to mix for 1-4min, and finally casting and tightly molding the mixture to obtain the chopped carbon fiber reinforced concrete, wherein the dosage of carbon fiber accounts for 0.2-2.5% of the total volume of the chopped carbon fiber reinforced concrete. The invention is beneficial to blending and dispersing the carbon fiber and the concrete, improving the tightness of the concrete, lowering production cost and mixing a large amount of the chopped carbon fiber reinforced concrete with stable and uniform performance on-site.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a preparation method of carbon fiber reinforced concrete. Background technique [0002] Cement concrete is the most consumed building material today, but cement concrete has disadvantages such as low tensile strength, large dry shrinkage, high brittleness and poor impact resistance, while carbon fiber is characterized by its high strength, high modulus, light weight and good corrosion resistance. And other advantages can improve the deficiency of ordinary cement concrete. Chopped carbon fibers are filled into concrete to restrict the expansion of micro-cracks, improve the crack resistance, impermeability and frost resistance of concrete, improve toughness, reduce drying shrinkage deformation, and significantly improve the mechanical properties of concrete structures. Furthermore, the incorporation of chopped carbon fibers can improve the electrical conductivity of concrete, so that chopp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C5/00B28C7/04
Inventor 孙明清侯正焘李滨陈龙龚学进范晓明
Owner WUHAN UNIV OF TECH
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