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Method for improving chlorine ion penetration resisting ability of cement-based material

A chloride ion permeation and cement-based material technology is applied in the field of improving the chloride ion permeation resistance of cement-based materials, and can solve problems such as inability to exert performance and excessive specific surface area.

Inactive Publication Date: 2019-12-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its large specific surface area, it is in a state of agglomeration under normal conditions, and cannot exert its excellent performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for improving the ability of cement-based materials to resist chloride ion penetration is characterized in that it comprises the following steps:

[0025] The parts required for the method of improving the resistance of cement-based materials to chloride ion penetration are:

[0026] 0.1 parts by mass of modified carbon nanotubes, 400 parts by mass of high belite sulfoaluminate cement, 200 parts by mass of water, 1200 parts by mass of standard sand, and 0.2 parts by mass of sodium lignosulfonate.

[0027] The preparation method of the modified carbon nanotubes is as follows: place the carbon nanotubes in a mixed acid, heat them in a water bath to 70° C., and cool them to room temperature after reflux for 3 hours.

[0028] The mixed-acid carbon nanotube solution was subjected to static filtration and cleaning for several times, and then suction-filtered and dried to constant weight. The mixed acid is concentrated nitric acid:concentrated sulfuric acid in a rati...

Embodiment 2

[0033] A method for improving the ability of cement-based materials to resist chloride ion penetration is characterized in that it mainly includes the following steps:

[0034] The parts required for the method of improving the resistance of cement-based materials to chloride ion penetration are:

[0035] 0.3 parts by mass of modified carbon nanotubes, 450 parts by mass of high belite sulfoaluminate cement, 220 parts by mass of water, 1300 parts by mass of standard sand, and 0.3 parts by mass of polycarboxylate superplasticizer.

[0036] The preparation method of the modified carbon nanotubes is as follows: place the carbon nanotubes in a mixed acid, heat them in a water bath to 80° C., and cool them to room temperature after reflux for 3.5 hours.

[0037] The mixed-acid carbon nanotube solution was subjected to static filtration and cleaning for several times, and then suction-filtered and dried to constant weight. The mixed acid is concentrated nitric acid:concentrated sulf...

Embodiment 3

[0042] A method for improving the ability of cement-based materials to resist chloride ion penetration is characterized in that it mainly includes the following steps:

[0043] The parts required for the method of improving the resistance of cement-based materials to chloride ion penetration are:

[0044] 0.5 parts by mass of modified carbon nanotubes, 500 parts by mass of high belite sulfoaluminate cement, 250 parts by mass of water, 1400 parts by mass of standard sand, and 0.4 parts by mass of naphthalene-based water reducer.

[0045] The preparation method of the modified carbon nanotubes is as follows: place the carbon nanotubes in a mixed acid, heat them in a water bath to 90° C., and cool them to room temperature after reflux for 4 hours.

[0046] The mixed-acid carbon nanotube solution was subjected to static filtration and cleaning for several times, and then suction-filtered and dried to constant weight. The mixed acid is concentrated nitric acid:concentrated sulfuri...

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Abstract

The invention provides a method for improving the chlorine ion penetration resisting ability of a cement-based material, and relates to the field of chlorine ion penetration resisting materials. According to the method, cement is taken as a base material, wherein the base material is prepared from main components of high-belite sulfoaluminate cement, and a composite material is prepared from components in parts by mass: 0.1-0.5 part of a modified carbon nanotube, 400-500 parts of high-belite sulfoaluminate cement, 200-250 parts of water, 1200-1400 parts of standard sand, and 0.2-0.4 part of asurfactant. According to the method for improving the chlorine ion penetration resisting ability of the cement-based material, compared with the high-belite sulfoaluminate cement-based material without adding of the carbon nanotube, the chlorine ion penetration resistance is improved.

Description

technical field [0001] The invention belongs to the field of anti-chloride ion penetration materials, in particular to a method for improving the anti-chloride ion penetration ability of cement-based materials. Background technique [0002] In recent decades, with the continuous development of my country's economy, more and more requirements have been put forward for high-performance cement, especially in marine engineering, facing severe weather and seawater erosion for a long time, causing damage to buildings, resulting in Damage to engineering structures. Therefore, improving the compactness of building materials, reducing porosity, and improving the ability to resist chloride ion penetration are problems that need to be solved in marine engineering. [0003] With the development of science and technology, nanomaterials have been paid more and more attention by people. Among them, carbon nanotubes, as an emerging nanomaterial, have excellent properties in thermal, electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B20/02C04B103/60
CPCC04B20/023C04B28/06C04B2103/60C04B14/026C04B14/06C04B2103/302
Inventor 崔素萍王家琛王剑锋兰明章王亚丽
Owner BEIJING UNIV OF TECH
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