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Cement-based material for adsorbing and solidifying chloride ions and preparation method thereof

A cement-based material and chloride ion technology, applied in the field of high-durability materials, can solve problems such as little research, achieve significant innovation, reduce migration coefficient and electric flux, and have significant engineering application prospects.

Active Publication Date: 2019-01-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is little research on the adsorption and solidification of chloride ions on phosphorus slag powder and its composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A new type of cement-based composite material that absorbs and solidifies chloride ions and its properties are as follows:

[0040] Portland cement: P·I 42.5 Portland cement, produced by Onoda Cement Plant, 28-day compressive strength 50.7MPa, 28-day flexural strength 8.6MPa.

[0041] Dispersant: polyoxyethylene nonylphenyl ether (CO890), produced by Sigma-Aldrich Chemical Reagent Company of the United States, white waxy solid.

[0042] Graphdiyne nanomaterials: prepared in the school laboratory, in powder form, with a particle size of 200 nm to 800 nm.

[0043] Mixing water: Dalian tap water.

[0044] Phosphorus slag powder: apparent density 2.7~3.4g / cm 3 , the specific surface area is 300~560m 2 / kg.

[0045] Quicklime: fineness 200-400 mesh, CaO content 88%-94%, MgO content less than 4%.

[0046] Combined with its test performance index, the parts by weight of each component of the raw material are as follows:

[0047] 150 parts of cement.

[0048] Dispersant ...

Embodiment 2

[0060] A new type of cement-based composite material that absorbs and solidifies chloride ions and its properties are as follows:

[0061] Portland cement: P·Ⅱ42.5 grade Portland cement, the main performance indicators should meet the requirements of GB175.

[0062] Dispersant: polyoxyethylene nonylphenyl ether (CO890), produced by Sigma-Aldrich Chemical Reagent Company of the United States, white waxy solid.

[0063] Graphdiyne nanomaterials: in powder form, with a particle size of 200 nm to 800 nm.

[0064] Mixing water: Dalian tap water.

[0065] Phosphorus slag powder: apparent density 2.7~3.4g / cm 3 , the specific surface area is 300~560m 2 / kg.

[0066] Quicklime: fineness 200-400 mesh, CaO content 88%-94%, MgO content less than 4%.

[0067] Combined with its test performance index, the parts by weight of each component of the raw material are as follows:

[0068] 360 parts of cement.

[0069] Dispersant 20 parts.

[0070] 5 parts of graphdiyne nanomaterials.

[...

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Abstract

The invention relates to a cement-based material for adsorbing and solidifying chloride ions and a preparation method thereof and belongs to the field of durability of cement-based materials. The cement-based material comprises the following raw materials in part by weight: 90-560 parts of Portland cement, 10-30 parts of dispersing agent, 2-6 parts of graphdiyne nano-material, 30-280 parts of phosphorus slag powder, 20-250 parts of quicklime and 70-375 parts of mixing water. The preparation method comprises the following steps: modifying the phosphorus slag powder by adopting the quicklime andplacing the dispersing agent and the graphdiyne nano-material in the mixing water for dissolution to prepare a dispersed suspension; adding the graphdiyne suspension in the Portland cement doped withthe phosphorus slag powder to stir and performing vibratory compaction molding on a stirred graphdiyne cement slurry pouring mold; de-molding after standard curing of a sample to a specified time. The cement-based material has good abilities to adsorb and solidify the chloride ions and can significantly improve the durability of reinforced concrete; meanwhile, the pressure of natural resources iseffectively relieved by efficient utilization of the phosphorus slag powder, so that the purposes of energy saving and emission reduction, building material recycling and green industrialization areachieved.

Description

technical field [0001] The invention belongs to the field of high-durability materials, and relates to a material capable of efficiently adsorbing and solidifying chloride ions, in particular to a cement-based material based on graphyne nanomaterials and phosphorus slag powder for efficiently adsorbing and solidifying chloride ions and a preparation method thereof . Background technique [0002] Reinforced concrete is currently the most widely used building structure material. However, due to insufficient understanding of the durability of concrete, a large number of concrete structures at home and abroad are prematurely destroyed, resulting in huge economic losses. Chlorine salts are one of the main factors that lead to the corrosion of steel bars in concrete. When the chloride ions in the chloride salt reach the surface of the steel bar and are adsorbed on the local passivation film, the local acidification of the chloride ions destroys the passivation film of the steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2111/20C04B2103/408C04B14/026C04B22/064C04B18/146
Inventor 王宝民王珍珍赵璐
Owner DALIAN UNIV OF TECH
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