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Active multifunctional carrier for microorganism self-repairing concrete and preparation method thereof

A multi-functional, microbial technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of insufficient impermeability and recovery of mechanical properties, long-term decline of microbial activity, and poor self-healing effect, so as to improve the self-healing effect and promote The effect of self-healing, enhancing the ability to deposit

Active Publication Date: 2020-05-08
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the existing microbial self-healing concrete technology, such as poor internal self-healing effect of cracks, long-term decline in microbial activity, insufficient recovery of impermeability and mechanical properties, etc., the purpose of the present invention is to provide an active multifunctional carrier for microbial self-healing concrete and its preparation method

Method used

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  • Active multifunctional carrier for microorganism self-repairing concrete and preparation method thereof
  • Active multifunctional carrier for microorganism self-repairing concrete and preparation method thereof
  • Active multifunctional carrier for microorganism self-repairing concrete and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) The internal functional components are based on 100% by mass, consisting of 5% carbonate slow-release components (ie 5wt% sodium carbonate), 60% pozzolanic active components (ie 20wt% fly ash, 20wt% silica fume and 20wt% % metakaolin), 30% inert filler component (ie 30wt% calcium carbonate powder) and 5% microbial powder component (ie 5wt% Bacillus subtilis powder), mix and stir the raw materials according to the above ratio and set aside.

[0037] (2) Add 5g of fly ash beads with a particle size of 0.3-0.5mm in the disc granulator as the granulation core;

[0038] (3) Turn on the water mist humidifier, the flow rate is 25ml / min, and the spraying time is 10s;

[0039] (4) Weigh 100g of pre-mixed raw materials and add them to the disc granulator. After the powder is evenly wrapped on the fly ash sinking beads, turn on the water mist humidifier until the surface of the granules is wet;

[0040] (5) Repeat step (4) until the particle radius reaches the design size;

...

Embodiment 2

[0047] (1) The internal functional components are based on 100% by mass, consisting of 10% carbonate slow-release components (ie 10wt% sodium carbonate), 50% pozzolanic active components (ie 20wt% fly ash, 20wt% silica fume and 10wt% % metakaolin), 38% inert filler component (that is, 38wt% quartz powder) and 2% microbial powder component (Bacillus subtilis powder), mix and stir the raw materials according to the above ratio and set aside.

[0048] (2) Add 5g of fly ash beads with a particle size of 0.3-0.5mm in the disc granulator as the granulation core;

[0049] (3) Turn on the water mist humidifier, the flow rate is 25ml / min, and the spraying time is 10s;

[0050] (4) Weigh 100g of pre-mixed raw materials and add them to the disc granulator. After the powder is evenly wrapped on the fly ash sinking beads, turn on the water mist humidifier until the surface of the granules is wet;

[0051] (5) Repeat step (4) until the particle radius reaches the design size;

[0052] (6) P...

Embodiment 3

[0059] (1) The internal functional components are based on 100% by mass, consisting of 15% carbonate slow-release components (ie 15wt% sodium carbonate), 40% pozzolanic active components (15wt% fly ash, 15wt% silica fume and 10wt% Metakaolin), 40% inert filler component (ie 20wt% calcium carbonate powder and 20wt% quartz powder) and 5% microbial powder component (ie 5wt% alkali-resistant Bacillus powder), mix the raw materials according to the above ratio Stir well and set aside.

[0060] (2) Add 5g of fly ash beads with a particle size of 0.3-0.5mm in the disc granulator as the granulation core;

[0061] (3) Turn on the water mist humidifier, the flow rate is 25ml / min, and the spraying time is 10s;

[0062] (4) Weigh 100g of pre-mixed raw materials and add them to the disc granulator. After the powder is evenly wrapped on the fly ash sinking beads, turn on the water mist humidifier until the surface of the granules is wet;

[0063] (5) Repeat step (4) until the particle rad...

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Abstract

The invention discloses an active multifunctional carrier for microbial self-repairing concrete and a preparation method thereof. The active multifunctional carrier is composed of a granulation mothernucleus, an internal functional component and an outer protective wall material, wherein the internal functional component comprises a carbonate slow-release component, a volcanic ash active component, an inert filler component and a microbial powder component. The carrier is prepared by a powder granulation technology. The functions of microorganism protection, carbonate slow release and volcanic ash reaction are integrated; firstly, microorganisms are well protected against survival in a harsh concrete internal environment; and secondly, when the crack triggers the carrier to crack, carbonate radicals can be slowly released to compensate the deficiency of carbonate radical formation capability induced by microorganisms in cracks, and meanwhile, the active components in the carrier can be subjected to a pozzolanic reaction with calcium hydroxide dissolved out of the cracks to form C-S-H gel with a gelling effect, so that the self-repairing effect of the cracks is improved through theinterlacing effect of multiple repairing products, and good anti-permeability and mechanical property recovery are achieved.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, in particular to an active multifunctional carrier for microbial self-repairing concrete and a preparation method thereof. Background technique [0002] With the acceleration of the modernization process, the scale of construction in my country is increasing day by day. Concrete has high compressive strength, good durability and low price. It is currently the most widely used construction engineering material in civil engineering. However, as a brittle material, concrete is subject to load, concrete shrinkage, temperature deformation, uneven settlement and other factors in engineering practice, causing concrete cracks. The corrosion of steel bars and the carbonization of concrete reduce the durability of materials and ultimately affect the bearing capacity of buildings. Inspired by the damage self-repair phenomenon of organic organisms in nature, researchers have proposed a variety of ...

Claims

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Application Information

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IPC IPC(8): C04B22/10B01J13/22
CPCC04B40/0039B01J13/22C04B22/10C04B22/08C04B22/0006C04B2103/0001
Inventor 罗勉白镜泉荆康丁子奇杨鼎宜
Owner YANGZHOU UNIV
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