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Preparation method for anti-permeability self-repairing concrete

A self-repairing and concrete technology, which is applied in the field of preparation of impermeable self-repairing concrete, can solve the problems of being easily eroded and damaged by the external environment, easy to age, and not durable, so as to achieve high impermeability and waterproof performance, prevent expansion, improve The effect of impermeability and pressure resistance

Inactive Publication Date: 2017-03-22
CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the problems of impermeable and self-repairing concrete, which are not durable, easy to age, easy to be eroded and damaged by the external environment, polymer repairing agents are often used in the traditional concrete repairing process. Preparation method: the present invention uses polyhydroxy rapeseed pollen as the crystal nucleus, heats it with urea solution and calcium hydroxide solution in a nitrogen pressurized environment to hydrolyze the urea to release carbon dioxide, and the carbon dioxide reacts with calcium hydroxide to form calcium carbonate crystals that are adsorbed on the On the pollen nucleus, the self-repairing filler is prepared, and then the glutinous rice is used to cultivate microorganisms and other auxiliary materials such as self-repairing fillers and coarse and fine aggregates to obtain concrete. Once the concrete is cracked, the microorganisms in a dormant state will recover. Carbon dioxide is produced during the period of metabolic function, reacts with pollen calcium carbonate crystals in the presence of water, and continues to form calcium carbonate crystals, so that the crystal nuclei continue to grow and become larger until the concrete gaps are completely blocked, realizing the impermeability of concrete Self-healing function, has broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Collect 200g of rapeseed flower pollen and pour it into 2L of urea solution with a mass fraction of 10%, and use an ultrasonic disperser to disperse ultrasonically for 30min at a power of 200W to obtain a pollen suspension, and then drop 250mL of mass concentration into the above pollen suspension. Be 1.0g / L calcium hydroxide solution, continue to stir and mix for 15min to obtain the reaction solution; Move the above-mentioned reaction solution in the autoclave, feed nitrogen into the still with the speed of 3mL / s until the pressure in the still reaches 2.0MPa and heat up to 75°C, start the stirrer in the reactor, and stir the reaction at 200r / min for 2 hours under heat preservation and pressure; Centrifuge with a horizontal centrifuge at a speed of 2000r / min for 15 minutes, separate and obtain the lower sediment, put the sediment in an oven, and dry at 105°C for 1 hour to obtain a self-repairing filler for later use; wash the steamer and use mulberry leaves as the botto...

example 2

[0019] Collect 300g of rape flower pollen and pour it into 4L of urea solution with a mass fraction of 15%, and use an ultrasonic disperser to disperse ultrasonically for 50min with a power of 300W to obtain a pollen suspension, and then drop 350mL of mass concentration into the above pollen suspension. Be 1.2g / L calcium hydroxide solution, continue to stir and mix 20min to obtain reaction liquid; Move above-mentioned reaction liquid in the autoclave, feed nitrogen into the still with the speed of 5mL / s until the pressure in the still reaches 2.3MPa and is heated up to 80°C, start the stirrer in the reactor, and stir for 3 hours at a speed of 300r / min under heat preservation and pressure; after the above reaction is completed, open the pressure relief valve of the reactor, and take out the product in the reactor after the pressure in the reactor returns to normal pressure, and use Centrifuge with a horizontal centrifuge at a speed of 3000r / min for 20min, separate and obtain the...

example 3

[0022] Collect 250g of rape flower pollen and pour it into 3L of urea solution with a mass fraction of 13%, and use an ultrasonic disperser to disperse ultrasonically for 40min at a power of 250W to obtain a pollen suspension, and then drop 300mL of mass concentration into the above pollen suspension. It is 1.1g / L calcium hydroxide solution, continue stirring and mixing 18min to obtain reaction liquid; Move above-mentioned reaction liquid in the autoclave, feed nitrogen into the still with the speed of 4mL / s until the pressure in the still reaches 2.1MPa and is heated up to 78°C, start the stirrer in the reactor, and stir for 3 hours at a speed of 250r / min under heat preservation and pressure; after the above reaction is completed, open the pressure relief valve of the reactor, and take out the product in the reactor after the pressure in the reactor returns to normal pressure, and use Centrifuge with a horizontal centrifuge at 2500r / min for 18 minutes, separate the lower layer...

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Abstract

The invention relates to a preparation method for anti-permeability self-repairing concrete and belongs to the technical field of preparation of anti-permeability self-repairing concrete. According to the method, polyhydric rape pollen serves as a crystal nucleus, the polyhydric rape pollen, a urea solution and a calcium hydroxide solution are heated under the environment of nitrogen pressurization, urea is made to be hydrolyzed to release carbon dioxide which reacts with calcium hydroxide to generate a calcium carbonate crystal adsorbed on the pollen crystal nucleus, and a self-repairing filler is prepared; and after glutinous rice cultivation microorganisms, the self-repairing filler and other auxiliary materials are composited, the concrete is obtained. Once the concrete prepared through the preparation method cracks, the metabolism function of the microorganisms in the dormant state is restored, carbon dioxide is generated and reacts with the pollen calcium carbonate crystal under the condition of water, a calcium carbonate crystal continues to be formed, and therefore the crystal nucleus can continuously grow and become large till a concrete gap is completely blocked, the anti-permeability self-repairing function of the concrete is achieved, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to a method for preparing anti-seepage self-repairing concrete, which belongs to the technical field of preparation of anti-seepage self-repairing concrete. Background technique [0002] With the high development of human society, modern architecture poses new challenges to concrete materials, requiring concrete materials not only to bear weight, but also to have functions such as sound, light, electricity, magnetism, and heat to meet the needs of multifunctional and intelligent buildings . Repairing concrete is the most widely used building material and structural material. Due to the composition of the structure itself and its bearing capacity characteristics, repairing concrete often has some original micro-cracks inside. During its service, with the change of load and time With the passage of time, the internal cracks will expand into cracks, and even extend to the surface to cause cracking of the concrete material. After for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B28/00C04B20/02C04B111/27
CPCC04B40/0039C04B20/023C04B28/00C04B2111/0075C04B2111/27C04B2111/343
Inventor 周丽花赵玲玲张晶
Owner CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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