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Swelling type micro-capsule/cement-based self-repair system

A microcapsule and self-repairing technology, which is applied in the field of concrete shrinkage reduction and crack repair, can solve the problems of unreachable repair, complicated production process, and influence on popularization and application, and achieve the effect of not being easily broken and having good mechanical properties

Pending Publication Date: 2018-08-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still some problems in the self-repairing technology of microcapsules of cement-based materials. For example, urea-formaldehyde or phenolic resin is a brittle material. During the mixing process of cement mixture, the capsule wall is easily broken, and the repairing agent is released in advance, which cannot achieve the purpose of repairing. ; Secondly, the preparation process of in-situ polymerization method is strict and the production process is complicated, thus affecting its popularization and application

Method used

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  • Swelling type micro-capsule/cement-based self-repair system

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Weigh 4.0 g of sodium alginate solid, add it to 250 mL of deionized water, and stir with a stirrer, and after the sodium alginate solid is completely dissolved, a 1.6 wt % sodium alginate solution is obtained;

[0042] In a water bath at 55°C, add the above-mentioned sodium alginate solution and 0.63 g of sodium dodecylbenzenesulfonate to the four-neck flask respectively, start the mechanical stirring device, and the emulsifier is formulated according to 0.25 wt% of the sodium alginate solution;

[0043] 20.0 g of E-51 bisphenol A epoxy resin was added thereto under stirring, stirred for 1.5 h at a stirring speed of 600 r / min, and an epoxy resin-sodium alginate mixed solution was obtained after cooling. The mass ratio of calcium alginate to epoxy resin is 1:5.

[0044] (2) Add the mixed solution obtained in step (1) into a disposable syringe, using a medical 25G needle;

[0045] Weigh 9.0g calcium chloride solid, add it into 300mL deionized water, after the calcium...

Embodiment 2

[0053] (1) Weigh 2.5g of sodium alginate solid, add it to 250mL deionized water, and stir with a stirrer, after the sodium alginate solid is completely dissolved, a 1.0wt% sodium alginate solution is obtained;

[0054] In a water bath at 65°C, add the above-mentioned sodium alginate solution and 0.38 g of sodium dodecylbenzenesulfonate to the four-neck flask respectively, start the mechanical stirring device, and the emulsifier is formulated according to 0.15 wt% of the sodium alginate solution;

[0055] 7.5g of E-51 bisphenol A epoxy resin was added thereto under stirring, stirred at a stirring speed of 600r / min for 1.5h, and an epoxy resin-sodium alginate mixed solution was obtained after cooling. The mass ratio of calcium alginate to epoxy resin is 1:3.

[0056] (2) Add the mixed solution obtained in step (1) into a 50mL disposable syringe, using a medical 21G needle;

[0057] Weigh 4.5g of calcium chloride solid and add it to 300mL of deionized water. After the calcium ch...

Embodiment 3

[0064] (1) Weigh 10.0 g of sodium alginate solid, add it to 250 mL of deionized water, and stir with a stirrer, and after the sodium alginate solid is completely dissolved, a 4.0 wt % sodium alginate solution is obtained;

[0065] In a water bath at 55°C, add the above-mentioned sodium alginate solution and 0.65 g of sodium dodecylbenzenesulfonate to the four-neck flask respectively, start the mechanical stirring device, and the emulsifier is formulated according to 0.25 wt% of the sodium alginate solution;

[0066] 40.0 g of E-51 bisphenol A epoxy resin was added thereto under stirring, stirred for 1.5 h at a stirring speed of 300 r / min, and an epoxy resin-sodium alginate mixed solution was obtained after cooling. The mass ratio of calcium alginate to epoxy resin is 1:4.

[0067] (2) Add the mixed solution obtained in step (1) into a 50mL disposable syringe, using a medical 30G needle;

[0068] Weigh 9.0g calcium chloride solid, add it into 300mL deionized water, after the c...

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Abstract

The invention relates to a swelling type micro-capsule / cement-based self-repair system. Calcium alginate is used as capsule walls, epoxy resin is used as capsule cores, accordingly, swelling type micro-capsules can be prepared, and the particle sizes of the micro-capsules range from 300 micrometers to 2.5 mm; basic components in a self-repair cement-based materials include cement, sand, the micro-capsules, water and epoxy resin curing agents, and the adding quantity of the micro-capsules is 0.5-10 wt% of the cement. The cement, the sand and the micro-capsules are uniformly stirred and dispersed, the water and the epoxy resin curing agents are poured into mixtures with the cement, the sand and the micro-capsules, and pouring forming, form stripping and curing are carried out after the water, the epoxy resin curing agents and the mixtures are uniformly stirred, so that the swelling type micro-capsule / cement-based self-repair system can be formed. The swelling type micro-capsule / cement-based self-repair system has the advantages that the micro-capsules have water absorption and swelling characteristics, accordingly, water can be compensated in cement hydration procedures, and the swelling type micro-capsule / cement-based self-repair system has an internal curing function; processes for synthesizing the swelling type micro-capsule / cement-based self-repair system are simple, the swelling type micro-capsule / cement-based self-repair system is good in mechanical property, is difficult to break in cement mixture stirring procedures and can be uniformly dispersed in the cement-based materials, and accordingly cracks can be self-repaired.

Description

technical field [0001] The invention relates to a swelling microcapsule / cement-based self-repair system, which belongs to the technical field of concrete shrinkage reduction and crack repair. Background technique [0002] During the service period of cement products, due to creep, changes in environmental humidity and uneven settlement, various cracks will occur. Moisture and other harmful substances will penetrate into the interior of the cement matrix through micro-cracks, which will lead to a series of strength reduction, carbonization, and corrosion of steel bars. problems, which in turn seriously affect the durability and safety of cement products. Aiming at this key problem, self-healing cement-based materials can promptly and effectively repair damage in the microscopic range, and fundamentally inhibit the development of crack damage, which has become one of the most cutting-edge solutions. [0003] At present, there are many studies on the self-repairing technology ...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B24/28C04B24/38C04B28/00
CPCC04B20/1048C04B24/281C04B28/00C04B40/0039C04B2201/50C04B24/38C04B22/002C04B24/121
Inventor 毛倩瑾伍文文梁鹏马建峰王子明崔素萍裴学东陈晶
Owner BEIJING UNIV OF TECH
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