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Self-healing cement-based capillary crystalline waterproof coating and preparation method thereof

A permeable crystalline waterproof, cement-based technology, applied in the field of building materials, can solve the problems of insufficient strength of cement-based materials, expensive core masterbatch, and high price

Active Publication Date: 2020-10-23
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cement-based permeable crystalline waterproof coating has expensive core masterbatches and insufficient strength of cement-based materials.
And the new waterproof material needs to be imported, which is expensive

Method used

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  • Self-healing cement-based capillary crystalline waterproof coating and preparation method thereof

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preparation example Construction

[0041] The above-mentioned preparation method of self-healing cement-based permeable crystalline waterproof coating is characterized in that it comprises the following steps:

[0042] Mix Portland cement and quartz sand, and magnetically stir to obtain the mixture;

[0043] Adding fast-setting and fast-hardening cement, graphene-modified steel slag powder and calcium carbonate to the mixture, and magnetically stirring to obtain a premix;

[0044] Add sodium sulfate, core masterbatch and thickener to the premix, and stir it magnetically to obtain it.

[0045] The present invention also discloses a core masterbatch of self-healing cement-based permeable crystalline waterproof coating, which is a mixture of bentonite, citric acid and isobutyl triethoxysilane. The bentonite, citric acid and isobutyl triethoxysilane The mass ratio of ethoxysilane is 100:(30-40):(5-10).

[0046] The present invention will be described in detail below in conjunction with specific embodiments.

Embodiment 1

[0048] Taking 100g of the product of the present invention as an example, it is prepared from raw materials of the following qualities: 40.9g of Portland cement, 40g of quartz sand, 5g of fast-setting and fast-hardening cement, 8g of graphene-modified steel slag powder, and 1.5g of calcium carbonate , Sodium sulfate 1g, core masterbatch 1.6g, thickener 2g.

[0049] The aforementioned Portland cement is 42.5 grade Portland cement. The grain size of the above-mentioned quartz sand is in the range of 0.5mm-4mm.

[0050] The one-hour compressive strength of the fast-setting and fast-hardening cement is 20.3MPa, and the 28-day compressive strength is 60.2MPa.

[0051] The above-mentioned graphene modified steel slag powder is a mixture of graphene and steel slag powder, the mass ratio of graphene and steel slag powder is 1:1000, and the specific surface area of ​​graphene is 2630m 2 / g, light transmittance is 97.7%, conductivity is 10 6 S / m, thermal conductivity is 5000W / m·k, specific su...

Embodiment 2

[0060] The differences between this embodiment and Embodiment 1 are listed below, and the contents not listed are the same.

[0061] Taking 100g of the product of the present invention as an example, it is prepared from the following quality raw materials: Portland cement 38.7g, quartz sand 45g, fast-setting fast-hardening cement 7g, graphene modified steel slag powder 4g, calcium carbonate 1g, Yuan Ming Powder 1.3g, core masterbatch 1.2g, thickener 1.8g.

[0062] The graphene modified steel slag powder is a mixture of graphene and steel slag powder, and the mass ratio of graphene and steel slag powder is 2:1000. Specific surface area of ​​steel slag powder 450cm 2 / g.

[0063] The above-mentioned core masterbatch is a mixture of bentonite, citric acid and isobutyltriethoxysilane, and the mass ratio of bentonite, citric acid and isobutyltriethoxysilane is 100:35:5.

[0064] The thickener is a mixture of methyl cellulose and polypropylene monofilament fibers, and the mass ratio of met...

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Abstract

The invention discloses a self-healing cement-based capillary crystalline waterproof coating and a preparation method thereof. The material is prepared from the following raw materials in percentage by mass: 35%-55% of Portland cement, 30%-45% of quartz sand, 5%-8% of quick-setting and quick-hardening cement; 4%-8% of graphene modified steel slag micro powder, 1%-2% of calcium carbonate, 1%-1.5% of anhydrous sodium sulphate and 1%-2% of core master batch, the core master batch is a mixture of bentonite, citric acid and isobutyltriethoxysilane, and the mass ratio of the bentonite to the citricacid to the isobutyltriethoxysilane is 100: (30-40): (5-10), the thickening agent accounts for 1%-%2, wherein the total content of the raw materials is 100%. The cement-based capillary crystalline waterproof coating is good in self-healing performance and low in price, and the strength and the cracking resistance are improved.

Description

【Technical Field】 [0001] The invention belongs to the technical field of building materials, and specifically relates to a self-healing cement-based permeable crystalline waterproof coating and a preparation method thereof. 【Background technique】 [0002] With the continuous development of engineering construction in China, there are endless water leakage problems in corresponding tunnels, underground projects, and houses, and the demand for waterproof materials is also increasing. At present, the types of waterproof materials in my country are complicated, and the waterproof technology is constantly updated. Commonly used waterproof materials include waterproof coiled materials, waterproof coatings, sealing materials, and leak-stopping materials. For polymer waterproofing membranes, there are disadvantages such as poor durability and poor air permeability. For projects with special requirements such as underground waterproofing projects, the temperature difference between day an...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/27
CPCC04B28/04C04B2111/27C04B2201/50C04B2111/00482C04B14/06C04B7/00C04B18/142C04B14/28C04B22/147C04B14/104C04B24/06C04B24/42C04B2103/44
Inventor 贺雄飞卓越邹翀张迅洪侨亨黄伟王光辉宋妍牛富生王春玲蒋永星杨朝帅
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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