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Compound mortar with compound addition of carbon fibers and nano-silica and preparation technology and application thereof

A technology of nano-silica and composite mortar, applied in the field of building materials, can solve problems such as large discreteness, and achieve the effect of small discreteness of resistivity, improved compressive strength, and promotion of dispersion.

Active Publication Date: 2015-12-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the uneven dispersion of carbon fibers will also make the resistivity of carbon fiber composite cement-based materials discrete even under the same ratio.

Method used

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  • Compound mortar with compound addition of carbon fibers and nano-silica and preparation technology and application thereof
  • Compound mortar with compound addition of carbon fibers and nano-silica and preparation technology and application thereof
  • Compound mortar with compound addition of carbon fibers and nano-silica and preparation technology and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0029] Embodiment 1-3 composite mortar mixed with carbon fiber and nano silicon dioxide

[0030] Table 1 raw material weight ratio ratio

[0031]

[0032] (1) Take the raw materials in the ratio described in Table 1; add water, water reducing agent, carbon fiber and nano-silica to the container, stir evenly, and ultrasonicate at 25°C for 30 minutes to obtain a mixture, and cool it to room temperature; then Add the mixture, cement, and standard sand into the cement mortar mixing pot, and stir evenly to obtain the mixture;

[0033] (2) pour the mixture into a mold (40mm×40mm×160mm), then place the mold on a vibrating table and vibrate for 20 seconds;

[0034] (3) According to the size of the mixture in the mold, insert electrodes for connecting external circuits (such as Figure 4 shown), vibrate for 10 seconds;

[0035] (4) Put the mold into the curing box, maintain it for 24 hours at a temperature of 20±1°C and a humidity greater than 95%, and then remove the mold to obt...

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Abstract

The invention discloses compound mortar with compound addition of carbon fibers and nano-silica and a preparation technology thereof. Raw materials are taken according to a certain weight ratio, water, a water reducing agent, carbon fibers and nano-silica are added into a container, stirred evenly and subjected to ultrasonic treatment at the temperature not higher than 30 DEG C to obtain a mixture, and then the mixture, cement and sand are added into a cement mortar stirring pot and evenly stirred to obtain a mix; the mix is poured into a mould, and the mould is placed on a vibrating table to be vibrated till slurry spills out of the surface; an electrode used for being connected with an external circuit is inserted into the mould according to the size of the mix in the mould; vibration is performed again; the mould is put into a curing box, and after curing is performed for 24 h under the conditions that the temperature is 20+ / -1 DEG C and the humidity is larger than 95%, demoulding is performed to obtain a test piece. By combining the advantages of nano-silica and the advantages of carbon fibers and utilizing the reinforcement mechanism and synergetic reinforcement prompting effect of nano-silica and carbon fibers, the compound mortar with compound addition of carbon fibers and nano-silica is finally prepared and is good in fracture resistance and compression resistance and small in resistivity variation coefficient.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a composite mortar compounded with carbon fiber and nano silicon dioxide and a preparation process thereof. Background technique [0002] As the reinforcing fiber of a new generation of cement-based composite materials, carbon fiber has become an ideal cement-based reinforcing material because of its excellent characteristics such as low density, high tensile strength, corrosion resistance, and good electrical and thermal conductivity. Adding chopped carbon fibers to cement-based composites can not only significantly improve the mechanical properties of cement-based composites such as shear strength and elastic modulus, but also endow carbon fiber cement-based materials with some functional / intelligent characteristics, which greatly expands the Application range of cement-based materials. [0003] Cement-based materials doped with carbon fibers not only have greatly i...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B14/38C04B14/06
Inventor 韩宝国张立卿王云洋欧进萍
Owner DALIAN UNIV OF TECH
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