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Super-hydrophobic modification method of mineral admixtures

A technology of mineral admixture and super-hydrophobic modification, applied in the field of super-hydrophobic modification of mineral admixture, can solve the problems of concrete cracking, steel bar corrosion, damage, etc., to increase the contact angle, increase the dispersibility, improve the The effect of durability

Active Publication Date: 2018-08-21
YELLOW RIVER ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete with micro-cracks and pores is subjected to the erosion and load of cold and heat cycles, dry-wet cycles, and its micro-cracks and pores will be connected, and erosive substances such as O 2 , CO 2 , Cl - With the intrusion of water into the concrete, it will lead to alkali aggregate reaction, sulfate corrosion, corrosion of steel bars, etc., and finally lead to concrete cracking, spalling and even destruction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Superhydrophobic modification of zeolite powders with different particle sizes:

[0022] Take 2 parts of 200g zeolite powder (commercially available natural clinoptilolite or mordenite powder can be used, the effect is the same), and use a planetary ball mill to grind to 200 mesh and 1200 mesh respectively for later use.

[0023] Take a 200-mesh zeolite powder sample and add it to 500ml of ethanol, ultrasonically treat it for 10 minutes, add 2ml of water dropwise under stirring conditions, and add 10g of KH-550 coupling agent dropwise after stirring evenly; then cyclohexane-n-butanol mixture ( Volume ratio 1:1) Add 200ml of the above solution and mix evenly, slowly add 25g of methyl silicone oil dropwise while stirring, continue stirring for 1 hour, dry the slurry and grind it to get the required 200 mesh superhydrophobic zeolite powder.

[0024] Another 1200-mesh zeolite powder sample was added to 500ml ethanol, ultrasonically treated for 10 minutes, 2ml wate...

Embodiment 2

[0026] Example 2 Carry out superhydrophobic modification to mica powder and metakaolin powder:

[0027] Take 200g of mica powder and 200g of metakaolin, and use a planetary ball mill to grind to 400 mesh and 2000 mesh respectively.

[0028] Take the ground 400-mesh mica powder sample and add it to 500ml of ethanol, ultrasonically treat it for 10min, add 2ml of water dropwise under the condition of stirring, add 10g of KH-550 coupling agent dropwise after stirring evenly; then cycloethane-n-butanol Add 200ml of the mixed solution (volume ratio 1:1) to the above solution and mix evenly, add 22g of methyl silicone oil dropwise under stirring, continue stirring for 1 hour, then dry the slurry and grind it to obtain the required 400-mesh superhydrophobic mica pink.

[0029] Take a 2000-mesh metakaolin powder sample and add it to 500ml ethanol, ultrasonically treat it for 10 minutes, add 2ml water dropwise under stirring conditions, add 14g KH-550 coupling agent dropwise after stir...

Embodiment 3

[0032] Embodiment 3 water absorption test

[0033] The water absorption rate of the specimen can reflect the difficulty of water entering the interior of the concrete, and then explain the ability of the concrete to resist the erosion of poor water quality.

[0034]The superhydrophobic modified mica powder and the superhydrophobic modified metakaolin powder mixture obtained after modification in Example 2 are used as admixtures, and the admixture additions are respectively 3% and 5% of the cementitious material in concrete. In the concrete, concrete flat specimens of 300mm×300mm×50mm were prepared respectively, and the concrete flat specimens without modified admixture were used as blank comparison pieces. After standard curing for 28 days, the initial weight was weighed after drying in an oven at 80°C for 72 hours. Then put the test piece into the water tank with the forming side up, and pad the lower part with a 10mm diameter round steel bar. The height of the test piece su...

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Abstract

The invention discloses a super-hydrophobic modification method of mineral admixtures. The super-hydrophobic modification method comprises the following steps: firstly crushing fly ash, granulated blast furnace slag powder, limestone powder and other mineral admixtures to obtain a powder material with a particle size of 100-20000 meshes; adding the powder material in ethanol for ultrasonic dispersion treatment, then sequentially dropwise adding water and a coupling agent and uniformly stirring; finally adding cyclohexane and n-butanol mixed liquid, then dropwise adding an appropriate amount ofsilicon oil modifiers, fully and uniformly stirring, drying treatment and grinding to a certain fineness. The super-hydrophobic modification method disclosed by the invention is simple and easy to operate; the fly ash, the granulated blast furnace slag powder and the limestone powder used in raw materials are several kinds of industrial waste residues with larger emission in China; through the super-hydrophobic modification method disclosed by the invention, the high-level comprehensive utilization of the waste residues is realized, a value added is improved, wastes are changed into valuables, and the regeneration of resources is realized while the environmental pollution is eliminated.

Description

technical field [0001] The invention relates to building materials, in particular to a method for superhydrophobic modification of mineral admixtures. Background technique [0002] Mineral admixtures refer to natural or artificial mineral powder materials with silicon, aluminum, calcium and other oxides as the main components and with a certain fineness, also known as auxiliary cementitious materials, which can be effectively Improving the performance of concrete is an important part of modern concrete. The amount of mineral admixture usually accounts for 10% to 60% of the mass of the cementitious material. Available mineral admixtures include fly ash, granulated blast furnace slag powder, silica fume, limestone powder, zeolite rock powder, metakaolin powder and other artificial mineral powders. The use of admixtures in concrete can reduce the cost of concrete, improve the performance of concrete, and at the same time consume a large amount of industrial waste, which is a ...

Claims

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Application Information

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IPC IPC(8): C04B20/10
CPCC04B20/1051C04B20/026C04B14/047C04B14/20C04B14/106C04B18/08C04B18/142C04B14/28
Inventor 张金良苏茂林尚宏琦吴法辰景来红毛文然杨林陈学理
Owner YELLOW RIVER ENG CONSULTING
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