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

Method used

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  • Super-hydrophobic modification method of mineral admixtures
  • Super-hydrophobic modification method of mineral admixtures

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1 Super-hydrophobic modification of zeolite powder of different particle sizes:

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

[0023] Take 200 mesh zeolite powder sample and add it to 500ml ethanol, ultrasonic treatment for 10min, add 2ml water dropwise under stirring condition, add 10g KH-550 coupling agent dropwise after stirring evenly; then add cycloethane-n-butanol mixture ( Volume ratio 1:1) Add 200ml of the above solution and mix evenly, slowly add 25g methyl silicone oil dropwise under stirring, continue stirring for 1h, dry and grind the slurry to obtain the required 200 mesh superhydrophobic zeolite powder.

[0024] Take another 1200 mesh zeolite powder sample and add it to 500ml ethanol, ultrasonic treatment for 10min, add 2ml water dropwise under stirring condition, add 16g KH-550 coupling ...

Example Embodiment

[0026] Example 2 Superhydrophobic modification of 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 for use.

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

[0029] Take a sample of 2000 mesh metakaolin powder and add it to 500ml ethanol, sonicate for 10min, add 2ml water dropwise under stirring, add 14g KH-550 coupling agent dropwise after stirring; then add cycloethane-n-butanol mixture (Volume ratio 1:1) Add 200ml of the above solution and mix evenly...

Example Embodiment

[0032] Example 3 Water absorption rate test

[0033] The water absorption rate of the test piece can reflect the difficulty of water entering the concrete, and then the concrete's ability to resist bad water erosion.

[0034] The superhydrophobic modified mica powder and superhydrophobic modified metakaolin powder mixture obtained after modification in Example 2 were used as admixtures, and the admixtures were 3% and 5% of the cementing material in the concrete, respectively. In the concrete, concrete slab specimens of 300mm×300mm×50mm were prepared respectively, and the concrete slab specimens without modified admixtures were used as the blank reference specimens. After standard curing for 28 days, dry it in an oven at 80°C for 72 hours and weigh the initial weight. Then put the test piece into the water tank with the molding surface up, and the lower part is cushioned with 10mm diameter round steel bars. The height of the test piece submerged in the water is 25mm. Keep the wate...

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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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