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Graphene oxide nano-modified cement-based grouting material and preparation method thereof

A grouting material and nano-modification technology, which is applied in the field of cement-based grouting materials, can solve problems such as penetration, shortened service life, and performance degradation of cement-based grouting materials, so as to improve water-reducing rate, prolong service life, reduce The effect of internal defects

Inactive Publication Date: 2021-02-09
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the actual application of cement-based grouting materials, micro-cracks will appear, and the micro-cracks will continue to accumulate, and finally defects such as cracks and penetration will appear.
Although the reinforcing material improves the overall strength and toughness of the cement-based grouting material, it cannot change the cracks and cracks in the hardened cement paste, which is also the main reason for the performance degradation and shortened service life of the cement-based grouting material.

Method used

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  • Graphene oxide nano-modified cement-based grouting material and preparation method thereof
  • Graphene oxide nano-modified cement-based grouting material and preparation method thereof
  • Graphene oxide nano-modified cement-based grouting material and preparation method thereof

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preparation example Construction

[0043]The invention also provides a method for preparing the graphene oxide nano-modified cement-based grouting material, which comprises the following steps:

[0044]1) Refining cement, carbon nanotubes, suspending agent and expansion agent to obtain dry material;

[0045]2) Mixing the dry material, polycarboxylic acid water reducing agent, inorganic powder material and part of water to obtain a slurry;

[0046]3) Mixing the slurry, graphene oxide, shrinkage reducing agent and remaining water to obtain a graphene oxide nano-modified cement-based grouting material.

[0047]The particle size of the dry material in step 1) of the present invention is preferably ≤80 μm, more preferably ≤75 μm.

[0048]In step 2) of the present invention, the part of the water is preferably 60 to 80% of the total mass of water, more preferably 65 to 75%, more preferably 70%; the mixing time is preferably 3 to 6 minutes, more preferably 4 ~5min.

[0049]The mixing time in step 3) of the present invention is preferably 1 t...

Embodiment 1

[0052]8.5 kg of Portland cement, 0.001 kg of carbon nanotubes, 0.3 kg of sodium bentonite and 0.5 kg of calcium sulfoaluminate powder were ground to obtain a dry material with a particle size of 80 μm. The obtained dry material, 0.05 kg of polycarboxylic acid water reducing agent, 0.3 kg of quartz sand (with a particle size of 800 mesh) and 2.5 kg of water are mixed for 3 minutes to obtain a slurry. The obtained slurry, 0.001 kg of graphene oxide with an oxygen content of 21% (sheet thickness of 5 nm, length and width are both 100 nm), 0.12 kg of fatty alcohol polyoxyethylene ether and 2 kg of water were mixed for 1.5 minutes to obtain oxidation Graphene nano-modified cement-based grouting material.

[0053]The graphene oxide nano-modified cement-based grouting material of Example 1 was cured for 7d and 28d and then tested for performance. The 7d compressive strength was 59MPa, the 7d flexural strength was 8.1MPa; the 28d compressive strength was 85MPa, and the 28d flexural strength 14...

Embodiment 2

[0055]9.5 kg of Portland cement, 0.005 kg of carbon nanotubes, 0.5 kg of sodium bentonite and 0.8 kg of calcium sulfoaluminate powder were ground to obtain a dry material with a particle size of 75 μm. The obtained dry material, 0.15 kg of polycarboxylic acid water reducing agent, 0.3 kg of quartz sand (with a particle size of 600 mesh), 0.3 kg of heavy calcium powder (with a particle size of 600 mesh) and 3.5 kg of water are mixed for 6 minutes to obtain a slurry. Mix the obtained slurry, 0.004kg of graphene oxide with 25% oxygen content (sheet thickness of 7nm, length and width of 300nm), 0.3kg of diethylene glycol monobutyl ether and 0.8kg of water for 3min to obtain Graphene oxide nano-modified cement-based grouting material.

[0056]The graphene oxide nano-modified cement-based grouting material of Example 2 was cured for 7d and 28d and then tested for performance. The 7d compressive strength was 60MPa, the 7d flexural strength was 8.0MPa; the 28d compressive strength was 88MPa, a...

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Abstract

The invention belongs to the technical field of cement-based grouting materials. The invention provides a graphene oxide nano-modified cement-based grouting material. The graphene oxide nano-modifiedcement-based grouting material is prepared from the following components in parts by mass: 85-95 parts of cement; 0.5-1.5 parts of a polycarboxylate superplasticizer; 0.01-0.04 part of graphene oxide;0.01-0.05 part of a carbon nano tube; 1.2-3 parts of a shrinkage reducing agent; 3-5 parts of a suspending agent; 5-8 parts of an expanding agent; 3-7 parts of an inorganic powder material; and 40-45parts of water. According to the invention, the nanoscale capillary pores in the cement-based grouting material are filled with the graphene oxide, so that a bridging effect is formed in micron-scalegel pores of the cement-based grouting material, and the anti-permeability performance of the cement-based grouting material is reinforced; the carbon nanotubes can increase the microcosmic adhesioneffect of the consolidation body surface of the cement-based grouting material to other substances, so that the service life of the cement-based grouting material can be remarkably prolonged.

Description

Technical field[0001]The invention relates to the technical field of cement-based grouting materials, in particular to a graphene oxide nano-modified cement-based grouting material and a preparation method thereof.Background technique[0002]At present, commonly used grouting materials mainly include chemical-based grouting materials and cement-based grouting materials. Compared with chemical-based grouting materials, cement-based grouting materials have a wide range of raw materials, cheap, non-toxic, corrosion-resistant, and stone-based The advantages of high strength and good durability are widely used in various grouting engineering fields.[0003]However, in practical applications, cement-based grouting materials will have micro-cracks, which will accumulate and eventually cracks, penetration and other defects. Although the reinforcement material improves the overall strength and toughness of the cement-based grouting material, it cannot change the cracks and cracks of the hardened...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B28/04C04B14/02C04B111/70
CPCC04B14/024C04B14/026C04B28/04C04B28/06C04B2111/70C04B2201/50C04B14/104C04B22/142C04B2103/302C04B14/06C04B22/002C04B24/32C04B14/28C04B24/023C04B7/02
Inventor 尹乾吴疆宇靖洪文江郑孟波高远
Owner CHINA UNIV OF MINING & TECH
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