A kind of ph value triggered self-healing aggregate and its preparation method
A self-healing and aggregate technology, applied in the field of cement-based materials, can solve the problems of high cost, affect the performance of cement-based materials, affect the strength of cement-based materials, etc., and achieve the effect of a simple preparation method
Active Publication Date: 2022-04-15
SHENZHEN UNIV
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a pH-triggered self-healing aggregate and its preparation method in view of the above-mentioned defects of the prior art, aiming to solve the complicated manufacturing process and high cost of the existing pH-triggered microcapsules. After the capsule rupture repair agent flows out, a defect will be formed to affect the performance of cement-based materials, and a large amount of incorporation will seriously affect the strength of cement-based materials
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0045] (1) Select 10g of lightweight aggregate with a particle size of 1 to 2 mm, place the lightweight aggregate in a vacuum dish containing a sodium nitrite solution with a mass concentration of 50%, and vacuumize for 45 minutes to make the lightweight aggregate fully absorb the sodium nitrite solution. saturation state. After filtering out excess sodium nitrite solution with a sieve, place the lightweight aggregate in a vacuum oven until completely dried to obtain lightweight aggregate with sodium nitrite adsorbed in the pores;
[0046] (2) Use a pipette to extract 20ml of toluene solvent and 5ml of absolute ethanol in a beaker and stir evenly, then weigh 2.75g of ethyl cellulose particles and add them to the beaker. Place the beaker on a magnetic stirring apparatus and stir until the ethylcellulose particles are completely dissolved to obtain a trigger film solution;
[0047] (3) Put the trigger film solution into the sprayer, and spray the trigger film solution on the su...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a PH value-triggered self-repairing aggregate and a preparation method thereof. The method comprises: mixing a porous material with a repairing agent solution, and obtaining a porous material with a repairing agent adsorbed in pores under a vacuum condition; triggering the membrane material Adding it into a solvent and stirring to obtain a trigger membrane solution; covering the surface of the porous material with the repairing agent adsorbed in the pores with the trigger membrane solution, and heating and drying to obtain a pH value triggered self-healing aggregate. The preparation method of the present invention uses lightweight aggregate as the carrier of the restoration agent and trigger membrane, absorbs the restoration agent through the pores of the lightweight aggregate, and covers the surface of the lightweight aggregate with the trigger membrane to obtain a pH value triggered self-healing aggregate. The preparation method is simple, does not require expensive equipment, and the lightweight aggregate is cheap and easy to obtain, and the addition of the lightweight aggregate as the aggregate into the cement-based material will not cause a serious reduction in strength, and will not introduce new defects into the cement-based material.
Description
technical field [0001] The invention relates to the technical field of cement-based materials, in particular to a pH value-triggered self-repairing aggregate and a preparation method thereof. Background technique [0002] Cement-based materials are the most widely used materials in civil and structural engineering, and their durability determines the service life of the project and the benefits of construction. The self-healing technology of traditional cement-based materials targets cracks, and the passage of corrosion ions into cement-based materials is blocked by repairing cracks. However, in many cases, even in the absence of cracks, carbon dioxide or corrosion ions can enter the interior of the cement-based material through the pores, resulting in the destruction of the steel protective film in the cement-based material. [0003] The existing method to solve the damage of steel protective film is pH-triggered microcapsules. Although its effect has been proved in some s...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/10C04B20/02
CPCC04B20/107C04B20/023C04B20/1007C04B20/1048C04B18/027C04B14/047C04B14/022C04B16/04
Inventor 王险峰陈少聪杨振鸿韩宁旭邢锋
Owner SHENZHEN UNIV