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High durability cement-based composite cementitious material

A composite cementitious material and durability technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of reduced durability of concrete structures, low service life of surface protective coatings, and impact on the durability of concrete structures To achieve the effect of saving land resources and slowing down the erosion of chloride ions

Active Publication Date: 2017-11-17
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Corrosion of steel bars in reinforced concrete structures is an important issue affecting the durability of concrete structures, and Cl - Penetration and intrusion in concrete is the main reason for the corrosion of steel bars. At present, the main protection technology used in engineering is concrete surface coating protection, but the service life of surface protective coatings is often low, and once it fails, the durability of concrete structures will be reduced. rapid lowering

Method used

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  • High durability cement-based composite cementitious material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition of high-durability cement-based composite cementitious material by weight percentage is Portland cement 50%, alkali slag 15%, fly ash 10%, slag 15%, nano-additive 5%, cationic migration type rust inhibitor 5% .

[0018] The preparation method of the cationic migration type rust inhibitor is: mixing stearic acid and triethylenediamine in a weight ratio of 1:1.2, heating and stirring with a heating mantle, and dehydrating in the range of 120-180°C Amidation, after 2-4 hours of reaction, gradually increase the temperature to 200-260°C for cyclization reaction, after 3-6 hours of reaction, react with quaternization reagent sodium chloroacetate at 80-100°C for 7-10 hours, Finally, a cationic migration type rust inhibitor is prepared.

[0019] Weigh each component according to the above weight percentage, first mix the nano-additive and cationic migration type rust inhibitor evenly, then add fly ash, alkali slag, slag and Portland cement and mix evenly to obt...

Embodiment 2

[0022] The composition of high-durability cement-based composite cementitious material by weight percentage is Portland cement 70%, alkali slag 11%, fly ash 4%, slag 9%, nano-additive 3%, cationic migration type rust inhibitor 3% .

[0023] The preparation method of the cation migration type rust inhibitor is the same as that in Example 1.

[0024] Weigh each component according to the above weight percentage, first mix the nano-additive and cationic migration type rust inhibitor evenly, then add fly ash, alkali slag, slag and Portland cement and mix evenly to obtain a high-durability cement-based Composite cementitious materials.

[0025] The compressive strength measurement is carried out to the cementitious material, and the 3-day compressive strength of measuring and obtaining the high-durability cement-based composite cementitious material is 13.1MPa, and the 3-day flexural strength is 3.2MPa; 28 days compressive strength is 40.5MPa, flexural strength is 8.5MPa. The in...

Embodiment 3

[0027] The composition of the high-durability cement-based composite cementitious material by weight percentage is Portland cement 60%, alkali slag 13%, fly ash 7%, slag 12%, nano-additive 4%, cation migration type rust inhibitor 4% .

[0028] The preparation method of the cation migration type rust inhibitor is the same as that in Example 1.

[0029] Weigh each component according to the above weight percentage, first mix the nano-additive and cationic migration type rust inhibitor evenly, then add fly ash, alkali slag, slag and Portland cement and mix evenly to obtain a high-durability cement-based Composite cementitious materials.

[0030] The compressive strength of the cementitious material was measured, and the 3-day compressive strength of the high-durability cement-based composite cementitious material was measured to be 16.1MPa, and the 3-day flexural strength was 4.5MPa; the 28-day compressive strength was 37.5MPa, flexural strength is 7.5MPa. The initial setting ...

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Abstract

The invention discloses a cement-based composite cementing material with high endurance. The composite cementing material is composed of the following ingredients, by weight, 50-70% of Portland cement, 11-15% of alkaline residues, 4-10% of fly ash, 9-15% of slag, 3-5% of nano additives and 3-5% of positive ion migration corrosion inhibitors, the weight percentage sum of the above ingredients being 100%. The composite cementing material can solve the recovery problems of industrial waste materials of alkaline residues or the like, can be used as a reinforced concrete structure in a marine environment and can relieve chloride ion erosion effectively.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high-durability cement-based composite gelling material. Background technique [0002] In 2014, my country's annual output of soda ash reached 25.1468 million tons, of which the production capacity of ammonia-soda method widely used in coastal areas was 12 million tons. Due to the characteristics of the ammonia-soda production process, about 0.3t of soda slag will be discharged for every 1t of soda ash produced. The amount of land occupied by soda slag ponds, waste quicklime, and fly ash piles is several thousand mu. Due to the lack of suitable technical means to deal with waste residues, the land occupation is increasing. Most of the large alkali plants are connected with power plants and lime plants. Together, surrounded by industrial towns, land resources are all at a premium. On the one hand, the stacking of soda slag occupies a large amount of land, and the accumulated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/14
CPCY02W30/91
Inventor 潘崇根金伟良舒咚咚王钲谢新宇毛江鸿俞元洪
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG