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High-strength and heat-resistant concrete

A heat-resistant concrete and high-strength technology, which is applied in the field of concrete, can solve problems such as the decrease of compressive strength, the increase of temperature variation and deformation difference between aggregate and cement slurry, etc., so as to improve the early strength, reduce the material shrinkage rate, improve and easy The effect of fluidity and self-resisting strength

Active Publication Date: 2019-01-08
北京建工新型建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At 500°C, the temperature change and deformation difference between the aggregate and the cement paste continued to increase, and the cracks at the interface continued to develop and extend; and after 400°C, the calcium hydroxide generated by cement hydration was dehydrated, and the volume expanded, which promoted the cracks to expand and resist compression. Significant decrease in intensity

Method used

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  • High-strength and heat-resistant concrete

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0052] Preparation example 1: Modified carbon fiber is prepared by the following method:

[0053] (1) Dispersion treatment: Soak the carbon fiber in acetone for 60 minutes, then clean it in an ultrasonic cleaner for 60 minutes, and dry it in a vacuum oven for 3 hours;

[0054] (2) Radiation grafting: After immersing the carbon fibers in step (1) in N-methylolacrylamide solution for 4 hours, carry out plasma treatment under the condition of an inert atmosphere and a pressure of 45 Pa, and the treatment time is 30 minutes;

[0055] (3) Post-treatment: wash the carbon fiber in step (2) three times with dichloromethane, and dry for 2 hours to obtain the modified carbon fiber.

preparation example 2

[0056] Preparation example 2: Modified carbon fiber is prepared by the following method:

[0057] (1) Dispersion treatment: Soak the carbon fiber in acetone for 75 minutes, then clean it in an ultrasonic cleaner for 50 minutes, and dry it in a vacuum oven for 3.5 hours;

[0058] (2) Radiation grafting: After soaking the carbon fibers in step (1) in N-methylolacrylamide solution and methacrylic acid solution for 4.5h, plasma treatment was carried out under the condition of an inert atmosphere and a pressure of 45Pa. The time is 25 minutes;

[0059] (3) Post-treatment: wash the carbon fiber in step (2) four times with dichloromethane, and dry for 2.5 hours to obtain the modified carbon fiber.

preparation example 3

[0060] Preparation example 3: Modified carbon fiber is prepared by the following method:

[0061] (1) Dispersion treatment: soak the carbon fiber in acetone for 90 minutes, then clean it in an ultrasonic cleaner for 40 minutes, and dry it in a vacuum oven for 3 hours;

[0062] (2) Radiation grafting: After soaking the carbon fiber in step (1) in N-methylolacrylamide solution and methacrylic acid solution for 5h, plasma treatment was carried out under the condition of an inert atmosphere and a pressure of 45Pa. 30min;

[0063] (3) Post-treatment: the carbon fiber in step (2) was washed 5 times with dichloromethane, and dried for 3 hours to obtain the modified carbon fiber.

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Abstract

The invention discloses high-strength and heat-resistant concrete and belongs to the technical field of concrete. The technical scheme is characterized in that the high-strength and heat-resistant concrete is prepared from components in parts by weight as follows: cement, crushed stone, high-strength ceramsite, a reinforcing agent, medium sand, silica fume, fly ash, vitrified microbeads, modifiedcarbon fibers, a water reducing agent and water, wherein the cement is P.O.42.5 ordinary Portland cement; the crushed stone comprises crushed basalt and crushed wollastonite. Heat resistance, impervious performance and compressive strength of the concrete are improved by the high-strength ceramsite; heat resistance and compressive strength of the concrete are improved by the reinforcing agent; aging resistance, heat resistance and cracking resistance of the concrete are improved by the vitrified microbeads; strength and flexibility of the concrete are improved by the modified carbon fibers; early strength, impervious performance and chemical corrosion resistance of the concrete are improved by the silica fume, and accordingly, strength and heat resistance of the concrete are improved.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a high-strength heat-resistant concrete. Background technique [0002] At present, the basic parts of blast furnaces, converters, coke ovens in the metallurgical industry and the lining parts of power plant chimneys are poured with concrete. Usually bear the load at high temperature of 200-700 ℃. Ordinary concrete is easily damaged when heated. The main reasons are the loss of water from the cement paste, the expansion of the aggregate, and the thermal gradient caused by the thermal expansion of the cement paste, the aggregate, and the steel bar. It is the result of many factors working together, and there is a very complicated relationship between them. The general law of ordinary concrete changing with temperature is: [0003] At 100°C, the free water in the concrete gradually evaporates, and capillary cracks and pores are formed inside; after loading, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/28C04B111/34C04B111/76
CPCC04B28/04C04B2111/00293C04B2111/28C04B2111/343C04B2111/763C04B2201/50C04B14/043C04B14/14C04B18/027C04B14/324C04B14/46C04B22/00C04B24/20C04B24/32C04B14/06C04B18/146C04B18/08C04B14/24C04B14/386C04B2103/302
Inventor 刘虎陈连义李强王丽丽李永新
Owner 北京建工新型建材有限责任公司
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