Concrete reinforcing steel bar corrosion prevention system based on microcapsule technology

A kind of microcapsule technology, concrete technology, applied in the field of anti-corrosion of steel bars, to achieve the effect of improving cohesion

Active Publication Date: 2021-12-17
山东省冶金产品质量监督检验站有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching, there is no report on the application of microcapsule technology in the anticorrosion of steel bars

Method used

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  • Concrete reinforcing steel bar corrosion prevention system based on microcapsule technology
  • Concrete reinforcing steel bar corrosion prevention system based on microcapsule technology

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Embodiment 1

[0023] 1. Steel bar preparation

[0024] Take 6 epoxy-coated steel bars, model GHT RL335-20, each 300mm long, without any defects on the surface of the steel bars; use ultrasonic to clean the steel bars, dry them in a desiccator for 24 hours, take them out, and then use an analytical balance Weigh the initial weight of each steel bar (as shown in Table 1), and store it in a desiccator for later use.

[0025] 2. Preparation of Microcapsules

[0026] Weigh 3.00 g of sodium alginate solid, add it to 250 mL of deionized water, place it on a constant temperature magnetic stirrer, set the temperature at 60°C and stir, and after the sodium alginate solid is completely dissolved, a sodium alginate solution is obtained.

[0027] Add 0.200g of sodium dodecylbenzenesulfonate and 20.00g of epoxy resin to the sodium alginate solution respectively, continue stirring for 30min, and obtain an epoxy resin-sodium alginate mixed solution after cooling. The mass ratio of calcium alginate to epo...

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Abstract

The invention discloses a concrete reinforcing steel bar anticorrosion system based on a microcapsule technology. The system comprises a concrete material and an epoxy resin coating reinforcing steel bar, wherein the concrete material is poured near the epoxy resin coating reinforcing steel bar, an epoxy resin curing agent is sprayed on the outer surface of the epoxy resin coating reinforcing steel bar, and a water-absorbing microcapsule with an epoxy resin as a core material is added into the concrete material. According to the invention, when a concrete matrix is cracked, water carrying harmful ions (Cl<-> and SO4<2->) continuously permeates along the crack propagation direction, the wall of a preset microcapsule near a reinforcing steel bar is broken due to the stress at the tip of the crack, and an epoxy resin flows out and meets a curing agent coated on the surface of the reinforcing steel bar, so that the surface of the reinforcing steel bar is cured and coagulated so as to prevent the direct contact between the epoxy coating steel bar and water and harmful ions, tand he wall of the microcapsule absorbs water and expands so as to block further permeation of water and harmful ions and protect the reinforcing steel bar from being rusted; and due to the use of the water-absorbing microcapsules, the binding power between the epoxy resin coated steel bar and concrete mortar is also improved.

Description

technical field [0001] The invention relates to a steel bar anticorrosion system for concrete based on microcapsule technology, which belongs to the technical field of steel bar anticorrosion. Background technique [0002] Corrosion of steel bars greatly damages the integrity and durability of concrete structures, seriously threatens people's lives and property safety, and also causes huge economic losses to the society. Researchers have studied the corrosion mechanism of steel bars and found that chloride ion corrosion is an important cause of depassivation and corrosion of steel bars. Therefore, people use cathodic protection, adding rust inhibitors, and developing epoxy-coated steel bars to slow down the corrosion rate of steel bars. Among them, the method of manufacturing epoxy-coated steel bars is simple and effective, and its application is becoming more and more extensive. [0003] Epoxy resin coated steel bar is a special steel bar coated with a layer of epoxy resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/28C09D163/00C09D5/08C04B111/26
CPCC04B28/00C04B20/1048C09D163/00C09D5/08C04B2111/26C04B14/06C04B24/121C04B32/02C04B24/281
Inventor 伍文文黄诚李晓桐宋婷婷王琛江舟刘超
Owner 山东省冶金产品质量监督检验站有限公司
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