Sulfate-corrosion-resistant high-strength concrete doped with carbon nanofibers and preparation method of sulfate-corrosion-resistant high-strength concrete

A carbon nanofiber and sulfate-resistant technology, which is applied in the field of concrete, can solve problems such as uneven dispersion of carbon nanofibers, reduced mechanical properties of concrete, and inability of concrete to resist sulfate erosion, so as to improve compactness, improve compactness, and excellent Effect of Sulfate Attack Resistance

Inactive Publication Date: 2021-02-23
贺笑笑
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at overcoming the problem that the concrete in the prior art is not resistant to sulfate attack and the uneven dispersion of carbon nanofibers in the concrete leads to the reduction of the mechanical properties of concrete, and provides a high-strength concrete doped with carbon nanofibers that is resistant to sulfate attack

Method used

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  • Sulfate-corrosion-resistant high-strength concrete doped with carbon nanofibers and preparation method of sulfate-corrosion-resistant high-strength concrete
  • Sulfate-corrosion-resistant high-strength concrete doped with carbon nanofibers and preparation method of sulfate-corrosion-resistant high-strength concrete

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Experimental program
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Effect test

Embodiment 1

[0024] The preparation method of modified carbon nanofiber comprises the following steps:

[0025] Mix the sulfuric acid solution with a mass fraction of 70% and the nitric acid solution with a mass fraction of 30% according to the volume ratio of 1:2, stir evenly, add carbon nanofibers, heat and keep warm for 5 hours, dilute with distilled water, add ammonia water dropwise to make the solution neutral After suction filtration and drying, activated carbon nanofibers are obtained; tetraethyl orthosilicate, ethanol and deionized water are mixed evenly according to the volume ratio of 1:2:2, and then activated carbon nanofibers are added, activated carbon nanofibers and The mass ratio of tetraethyl orthosilicate is 1:4, stir and mix evenly to obtain a mixed solution, heat it in a water bath to 75°C, add dropwise an ammonia solution with a mass concentration of 25%, and the amount of the ammonia solution added is tetraethyl orthosilicate 5wt%, stirred for 2.5h, left to age for 8h,...

Embodiment 2

[0030] The preparation method of modified carbon nanofiber comprises the following steps:

[0031]Mix the sulfuric acid solution with a mass fraction of 70% and the nitric acid solution with a mass fraction of 30% according to the volume ratio of 1:2, stir evenly, add carbon nanofibers, heat and keep it warm for 4.5 hours, dilute with distilled water, add ammonia water dropwise to make the solution appear Neutral, after suction filtration and drying, to obtain activated carbon nanofibers; mix tetraethyl orthosilicate, ethanol and deionized water according to the volume ratio of 1:2:2, and then add activated carbon nanofibers to activate carbon nanofibers The mass ratio to tetraethyl orthosilicate is 1:2.5, stir and mix evenly to obtain a mixed solution, heat it in a water bath to 70°C, add dropwise an ammonia solution with a mass concentration of 25%, and the amount of the ammonia solution added is tetraethyl orthosilicate 5wt% of the ester, stirred and reacted for 1.5h, stood...

Embodiment 3

[0036] The preparation method of modified carbon nanofiber comprises the following steps:

[0037] Mix the sulfuric acid solution with a mass fraction of 70% and the nitric acid solution with a mass fraction of 30% according to the volume ratio of 1:2, stir evenly, add carbon nanofibers, heat and keep warm for 6 hours, dilute with distilled water, add ammonia water dropwise to make the solution neutral After suction filtration and drying, activated carbon nanofibers are obtained; tetraethyl orthosilicate, ethanol and deionized water are mixed evenly according to the volume ratio of 1:2:2, and then activated carbon nanofibers are added, activated carbon nanofibers and The mass ratio of tetraethyl orthosilicate is 1:5, stir and mix evenly to obtain a mixed solution, heat it in a water bath to 73°C, add dropwise an ammonia solution with a mass concentration of 25%, and the amount of the ammonia solution added is tetraethyl orthosilicate 5wt%, stirred for 3 hours, left to age for ...

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Abstract

The invention relates to the technical field of concrete, and discloses sulfate-corrosion-resistant high-strength concrete doped with carbon nanofibers and a preparation method of the sulfate-corrosion-resistant high-strength concrete. The concrete comprises the following components in percentage by mass: 15-20% of Portland cement, 20-25% of fine aggregate, 15-20% of coarse aggregate, 5-10% of modified carbon nanofibers, 1-3% of a polycarboxylate superplasticizer and the balance of water. The preparation method comprises the following steps: adding the Portland cement, the fine aggregate and the coarse aggregate into a stirrer, uniformly stirring, adding the polycarboxylate superplasticizer and the water, uniformly stirring and mixing, finally adding the modified carbon nanofibers, and uniformly stirring and mixing, thereby obtaining the product. The modified carbon nanofibers are added into the concrete, so that the sulfate corrosion resistance of the concrete is improved, and the mechanical strength of the concrete is also improved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a sulfate-resistant high-strength concrete doped with carbon nanofibers and a preparation method thereof. Background technique [0002] Concrete refers to the collective name of engineering composite materials that use cementitious materials to cement aggregates into a whole. The term concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates, mixed with water in a certain proportion Cement concrete obtained by mixing, also known as ordinary concrete, is widely used in civil engineering. In real life, roads, bridges, and houses all need concrete as a raw material for implementation. However, general concrete has problems such as poor sulfate resistance and low mechanical strength. Chinese Patent Publication No. CN104944863 discloses a method for preparing recycled fine aggregate high-strength self-compacting concrete. First, the recycled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/10C04B20/02C04B14/38C04B111/20
CPCC04B20/023C04B20/1066C04B28/04C04B2111/2015C04B14/02C04B14/06C04B2103/302C04B14/386C04B20/006
Inventor 贺笑笑
Owner 贺笑笑
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