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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AI-Extracted 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...

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.

Technology Topic

Industrial wasteToxic industrial waste +11

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Examples

Experimental program(4)

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 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 80g methyl silicone oil dropwise under stirring, continue stirring for 1h, dry and grind the slurry to obtain the required 1200 mesh superhydrophobic zeolite powder .

[0025] The above two groups of modified powders can be mixed to obtain superhydrophobic modified zeolite powder materials with different particle sizes (200 mesh and 1200 mesh).

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, slowly add 70g methyl silicone oil dropwise under stirring, continue stirring for 1h, dry and grind the slurry to obtain the required 2000 mesh superhydrophobic metakaolin powder.

[0030] By mixing the above two groups of modified powders, a mixture of superhydrophobic modified mica powder and metakaolin powder with different particle sizes can be obtained.

[0031] When the fly ash, granulated blast furnace slag powder and limestone powder are subjected to super-hydrophobic modification treatment, the method is the same as in Example 1.

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 water level unchanged, take it out after soaking for 48 hours, wipe off the surface water of the test piece, weigh the weight after water absorption, and calculate the water absorption rate of the test piece. See the water absorption test process figure 1 , The results are shown in Table 1.

[0035] Table 1 Test results of water absorption

[0036]

[0037] From figure 1 It can be seen from the results in Table 1 that after the test piece is soaked in water, the surrounding area of the blank group has been wetted by water within a short period of time (2h), and the wettability of the 3% and 5% superhydrophobic mineral admixture group is not obvious. After 48 hours, due to capillary water absorption, most of the surface of the blank group was soaked, 3% of the group had only local wetness around, and 5% of the group had almost no wetness. Comparing the 48h water absorption rate, the 3% and 5% groups were 61% and 70% lower than the blank group, respectively. Conclusion: The superhydrophobic mineral admixture modified by the method of the present invention has a significant effect on reducing the water absorption of concrete.

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Classification and recommendation of technical efficacy words

Modification method is simple
easy to operate

Lithium-rich manganese-based positive electrode material with aluminum-doped surface and titanium-aluminum-lithium phosphate-coated surface and preparation thereof

ActiveCN111987297AInhibition of phase transitionModification method is simple

Owner:北京理工大学重庆创新中心 +1

Super-hydrophobic modification method of mineral admixtures

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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