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High-toughness concrete and preparation method thereof

A concrete and high-toughness technology, applied in the field of building materials, can solve the problems of loss of excellent performance, thermodynamic instability, high specific surface energy, etc., and achieve the effects of enhancing repulsion, improving overall mechanical properties, and simple operation

Inactive Publication Date: 2014-09-24
HONGFENG GRP FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene has a large specific surface area and high specific surface energy, and the van der Waals force between the sheets is as high as 5.9 KJ·mol-1, which is in a thermodynamically unstable state. Therefore, unless the graphene sheets are well separated, Otherwise, these factors will lead to irreversible agglomeration of graphene to form massive aggregates, and even re-stacking into graphite, thus losing its excellent properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First prepare the modified graphene that surface hydroxyl content is 0.008%, and its preparation specifically comprises the following steps:

[0044] 1) Add 2 kg of 200-mesh natural flake graphite into 20 L of concentrated sulfuric acid at 0°C, and stir for 2 hours; then slowly add 0.9 kg of potassium persulfate and 1 kg of phosphorus pentoxide, and stir for 4 hours at 20°C, Raise the temperature to 40°C and stir for 24 hours; then slowly add 80 L of water and stir for 2 hours, then slowly add 3.6 L of hydrogen peroxide with a mass fraction of 30% to obtain a suspension with bright yellow particles; centrifuge the bright yellow particles and wash with water After cleaning, vacuum-dry at 60°C for 12 h to obtain 1.86 kg of graphene oxide;

[0045] 2) Take 1.2 kg of graphene oxide, add it to 10 L of thionyl chloride, reflux and stir at 80 °C for 24 h, then centrifuge, wash with acetone, and vacuum dry at room temperature for 12 h to obtain surface acid chloride groups Gra...

Embodiment 2

[0075] First prepare the modified graphene that surface hydroxyl content is 0.012%, and its preparation specifically comprises the following steps:

[0076] 1) Add 2 kg of 200-mesh natural flake graphite into 20 L of concentrated sulfuric acid at 1°C, and stir for 2 hours; then slowly add 0.9 kg of potassium persulfate and 1 kg of phosphorus pentoxide, and stir for 4 hours at 20°C, Raise the temperature to 40°C and stir for 24 hours; then slowly add 80 L of water and stir for 2 hours, then slowly add 3.6 L of hydrogen peroxide with a mass fraction of 30% to obtain a suspension with bright yellow particles; centrifuge the bright yellow particles and wash with water After cleaning, vacuum-dry at 60°C for 12 h to obtain 1.86 kg of graphene oxide;

[0077] 2) Take 1.2 kg of graphene oxide, add it to 10 L of thionyl chloride, reflux and stir at 80 °C for 24 h, then centrifuge, wash with acetone, and vacuum dry at room temperature for 12 h to obtain surface acid chloride groups Gra...

Embodiment 3

[0090] First prepare the modified graphene that surface hydroxyl content is 0.01%, and its preparation specifically comprises the following steps:

[0091] 1) At 2°C, add 2 kg of 200-mesh natural flake graphite into 20 L of concentrated sulfuric acid, and stir for 2 hours; then slowly add 0.9 kg of potassium persulfate and 1 kg of phosphorus pentoxide, and stir for 4 hours at 20°C, Raise the temperature to 40°C and stir for 24 hours; then slowly add 80 L of water and stir for 2 hours, then slowly add 3.6 L of hydrogen peroxide with a mass fraction of 30% to obtain a suspension with bright yellow particles; centrifuge the bright yellow particles and wash with water After cleaning, vacuum-dry at 60°C for 12 h to obtain 1.86 kg of graphene oxide;

[0092] 2) Take 1.2 kg of graphene oxide, add it to 10 L of thionyl chloride, reflux and stir at 80 °C for 24 h, then centrifuge, wash with acetone, and vacuum dry at room temperature for 12 h to obtain surface acid chloride groups Gra...

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Abstract

The invention discloses high-toughness concrete and a preparation method thereof. The formula of the high-toughness concrete comprises 0.2-0.5kg / <m>3 of modified graphene, 150-175kg / <m>3 of water, 395-415kg / <m>3 of cement, 45-60kg / <m>3 of coal ash, 20-35kg / <m>3 of slag powder, 1000-1100 kg / <m>3 of broken stone, 600-700 kg / <m>3 of fine aggregate and 4.5-7 kg / <m>3 of a water reducing agent, wherein the modified graphene is water-soluble grapheme of which the surface has hydroxide radicals; the content of the hydroxide radicals is 0.005-0.012 percent. When the modified grapheme is used for preparing high-toughness concrete, first, the modified grapheme can be dissolved in water to form a graphene water solution; then, the graphene water solution and other concrete preparation materials are uniformly mixed, novel high-toughness concrete obtained after curing can show obvious strain hardening or deformation hardening characteristic under the action of direct tensile load or bending load, and can be applied to bridge floors of high-speed rail viaducts and long-span sea-crossing and river-crossing bridges, and various tunnel arches such as subways. The high-toughness concrete is high in technological content and has relatively good application prospect.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-toughness concrete and a preparation method thereof. Background technique [0002] As the most widely used building material in the world today, concrete has the disadvantages of low flexural strength and high brittleness, which leads to cracks or even fractures in concrete, which seriously affects the overall safety and service life of buildings. There are a large number of building structures and parts in modern buildings, such as high-speed railway viaducts, bridge decks of long-span sea-crossing and river-crossing bridges, and various types of tunnel arch walls such as subways. Due to the complex and harsh stress environment, bending strength must be adopted Possibly high high toughness concrete material. In order to improve the toughness of concrete, steel bars were adopted earlier and have been used in large quantities till now. After that, various fib...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C01B31/04
Inventor 蔡思源蔡慧萍蔡凤水毛祥华蒋国平
Owner HONGFENG GRP FUJIAN
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