Cement-based capillary crystalline waterproof coating and use method thereof

Abstract

The invention provides a cement-based permeable crystallization type waterproof coating which comprises the following components in percentage by weight: 45-60% of cement polymer powder, 2.5-5% of silicic acid powder, 1-2% of a complexing agent, 2-4% of an auxiliary agent, 5-10% of carbohydrate and 20-30% of water, the cement polymer powder comprises Portland cement powder and sulphoaluminate cement powder, the silicic acid powder comprises fluorine silicon crystal acid, silica fume, talcum powder and quartz particles, the complexing agent comprises butyl acrylate or polyacrylate, the auxiliaries comprise high-toughness resin, stearic acid or aluminum stearate and polyester acid vinyl ester or polyester acid vinyl adhesive, and the carbohydrate comprises starch. According to the invention, outside water and other harmful media are prevented from invading the concrete, water-insoluble branch and tendril-shaped crystals are generated in the concrete, pores and micro-cracks in the concrete are sealed, and a rigidity and softness combined process is adopted, so that the invasion of the outside water is effectively blocked, and the effects of water blocking and water prevention are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a cement-based penetrating crystalline waterproof coating and a use method thereof. Background Art

[0002] Concrete is a non-homogeneous, porous, micro-cracked, and highly permeable material with a rough surface. It can absorb water through capillaries, and this process is often accompanied by the adsorption of harmful substances. As for water, water can cause frost and thaw of materials. If it is corroded by moisture in the air for a long time, the substrate will suffer from high stress of alternating dry and wet, causing surface cracking, and the generation and development of cracks will lead to the invasion of harmful substances; substances dissolved in water, especially chloride ions, will destroy the passivation layer on the surface of the steel bar, causing catastrophic corrosion; water can carry pollutants and dust, causing the structure to be contaminated; water can also cause salt to migrate from the inside of the material to the outside, thereby weathering the surface of the structure and producing salt frost. Comprehensively considering the various deterioration mechanisms of concrete structures, it can be seen that almost all chemical and physical processes that affect the durability of concrete structures involve two main factors, namely water and its migration in the pores and cracks of concrete. Therefore, it is very important to waterproof the surface of concrete structures to prevent water intrusion from the external environment, in order to improve the durability of concrete and ensure the clean appearance of concrete.

[0003] There are many waterproof materials at present, which are mainly divided into two categories according to their waterproofing functions, namely film-forming (physical method) coatings and penetrating (chemical method) coatings. The film-forming type uses the protective coating itself to form a film to block the corrosive medium from entering the concrete. The concrete protection effect of this coating method is closely related to the properties of the formed film. The quality of the film directly affects the durability of the concrete. Penetrating coatings refer to waterproof coatings that penetrate into the concrete and undergo complex physical and chemical reactions with the cement hydration products in the pores of the cement stone to generate new substances. This new substance has strong hydrophobicity and can change the wetting angle between the pore wall of the cement stone and water, thereby effectively preventing the intrusion of corrosive media with water as the carrier.

[0004] Among them, cement-based penetrating crystallization waterproof materials can react with various oxides in concrete to form water-insoluble crystals in concrete, blocking capillary pores and forming secondary crystallization when microcracks are generated, thereby making the concrete dense and waterproof. Penetrating crystallization waterproof materials are a new type of material suitable for waterproofing and repairing applications in construction projects. They are easy to use and are a preferred material for users. They are in line with the research and development direction of functional green building materials and are a hot spot in waterproof technology research at home and abroad. Compared with traditional waterproof materials, penetrating crystallization waterproof materials have good compatibility with concrete substrates, no aging risks, no volatile gas release, and moisture-proof concrete buildings after penetrating crystallization still have breathable properties, which can be widely used in industrial, civil, and underground projects; in addition, they are easy to use and can be applied by surface painting or spraying, making them a functional green building material.

[0005] However, the current cement-based penetrating crystallization waterproof coatings have different waterproof capabilities, and have problems such as easy cracking, low material impermeability pressure, low compressive strength, and poor adhesion to the base layer resulting in poor waterproofing effect. Therefore, the existing technology has limitations. Summary of the invention

[0006] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a cement-based penetrating crystalline waterproof coating and a method of using it.

[0007] The present invention provides a cement-based penetrating crystalline waterproof coating, which has the following characteristics and comprises the following components by weight percentage:

[0008] Cement polymer powder 45-60%, silica powder 2.5-5%, complexing agent 1-2%, additive 2-4%, carbohydrate 5-10%, water 20-30%,

[0009] Cement polymer powder includes silicate cement powder and sulphoaluminate cement powder, siliceous powder includes fluorosilicic acid, silica fume, talc and quartz particles, complexing agents include butyl acrylate or polyacrylate, additives include high-toughness resin, stearic acid or aluminum stearate, polyester acid vinyl ester or polyester acid vinyl adhesive, and carbohydrates include starch.

[0010] The cement-based penetrating crystallization waterproof coating provided by the present invention can also have the following characteristics: the ratio of silicate cement powder to sulphoaluminate cement powder is 8:2.

[0011] The cement-based penetrating crystallization waterproof coating provided by the present invention can also have the following characteristics: the proportion of fluorosilicic acid, silica fume, talcum powder and quartz particles is 1:1:3:5.

[0012] The cement-based penetrating crystallization waterproof coating provided by the present invention can also have the following characteristics: the proportion of high-toughness resin, stearic acid or aluminum stearate, and polyester vinyl ester or polyester vinyl adhesive is 6:3:1.

[0013] The present invention also provides a method for using a cement-based penetrating crystalline waterproof coating for wall waterproofing, which has the following characteristics: the method is applicable to any one of the above-mentioned cement-based penetrating crystalline waterproof coatings, comprising the following steps:

[0014] S1. Beat the base flour layer in the wall area where waterproofing is required until it reaches the concrete base;

[0015] S2. Use a high-pressure water gun to wash the wall construction area to avoid affecting the waterproof penetration effect;

[0016] S3. V-shaped grooves are cut for defects and repair areas of new and old joints, cement-based penetrating crystalline waterproof coatings are injected into the cracks in the V-shaped grooves under high pressure, the V-shaped grooves are filled with existing rigid waterproofing, and glass fiber mesh and existing high-elasticity and high-toughness waterproof coatings are laid on the surface of the rigid waterproofing for anti-cracking treatment;

[0017] S4. Use cement-based penetrating crystalline waterproof coating mixed with mortar to powder-brush the wall construction area;

[0018] S5. After the powder batching is completed, hang glass fiber mesh cloth in the wall construction area;

[0019] S6. Use cement-based penetrating crystalline waterproof coating mixed with mortar to reinforce the wall construction area;

[0020] S7. Finally, use the existing moisture-proof and anti-condensation thermal insulation mortar to apply powder to the wall construction area to complete the wall waterproofing.

[0021] The present invention also provides a method for using a cement-based penetrating crystalline waterproof coating for ground waterproofing, which has the following characteristics: the method is applicable to any one of the above-mentioned cement-based penetrating crystalline waterproof coatings, comprising the following steps:

[0022] S1. Determine whether the ground area to be waterproofed is solid and firm. If the base surface is soft, it needs to be hammered down to the concrete base surface;

[0023] S2. Use a high-pressure water gun to wash the waterproof floor construction area to avoid affecting the waterproof penetration effect;

[0024] S3. V-shaped grooves are cut in the defective and old-new joint repair areas, and cement-based penetrating crystalline waterproof coatings are injected into the cracks in the V-shaped grooves under high pressure. The V-shaped grooves are filled with existing rigid waterproof coatings, and glass fiber mesh and existing high-elasticity and high-toughness waterproof coatings are laid on the surface of the rigid waterproof coatings for anti-cracking treatment to avoid cracking and leakage;

[0025] S4. Perform negative water pressure waterproofing or waterproof leveling treatment on the waterproof floor construction area, and lay wire mesh in the ground construction area;

[0026] S5. Mix cement-based penetrating crystalline waterproof coating with cement, yellow sand and gravel, then pour 3-5cm thick and press hard in the ground use area to complete ground waterproofing.

[0027] Functions and Effects of the Invention

[0028] According to the cement-based penetrating crystalline waterproof coating involved in the present invention, cement is used as the main film-forming component, and a suitable film-forming auxiliary agent is selected to increase the toughness of the cement-based penetrating crystalline waterproof coating, so that the density of the internal structure of the concrete is enhanced, and the capillary pores and microcracks on the surface of the concrete are effectively blocked to prevent the invasion of external water and other harmful media; at the same time, a high-penetration complexing auxiliary agent and a complexing agent are introduced to penetrate into the interior of the concrete through a carrier, and a physical and chemical reaction occurs in the capillary pores to generate water-insoluble dendrite-like crystals, which seal the capillary pores and microcracks inside the concrete, and the rigid-flexible process is combined to effectively block the invasion of water from the outside, thereby playing a role of water blocking and waterproofing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a flow chart of the method for using the cement-based penetrating crystalline waterproof coating. FIG. 2 is a flow chart showing a method for using the cement-based penetrating crystalline waterproof coating for ground waterproofing in the present invention. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is specifically described in the following embodiments in conjunction with the accompanying drawings.

[0031] Example

[0032] This embodiment provides a cement-based penetrating crystalline waterproof coating, which includes the following components by weight percentage:

[0033] Cement polymer powder 45-60%, silica powder 2.5-5%, complexing agent 1-2%, additive 2-4%, carbohydrate 5-10%, water 20-30%,

[0034] Cement polymer powder includes silicate cement powder and sulphoaluminate cement powder, siliceous powder includes fluorosilicic acid, silica fume, talc and quartz particles, complexing agents include butyl acrylate or polyacrylate, additives include high-toughness resin, stearic acid or aluminum stearate, polyester acid vinyl ester or polyester acid vinyl adhesive, and carbohydrates include starch.

[0035] In this embodiment, the ratio of silicate cement powder to sulphoaluminate cement powder is 8:2.

[0036] In this embodiment, the proportion of fluorosilicic acid, silica fume, talcum powder and quartz particles is 1:1:3:5.

[0037] In this embodiment, the ratio of high-toughness resin, stearic acid or aluminum stearate, and polyester vinyl ester or polyester vinyl adhesive is 6:3:1.

[0038] The present invention also provides a method for using a cement-based penetrating crystalline waterproof coating for wall waterproofing, which has the following characteristics: the method is applicable to any one of the above-mentioned cement-based penetrating crystalline waterproof coatings, comprising the following steps:

[0039] S1. Beat the base flour layer in the wall area where waterproofing is required until it reaches the concrete base;

[0040] S2. Use a high-pressure water gun to wash the wall construction area to avoid affecting the waterproof penetration effect;

[0041] S3. V-shaped grooves are cut for defects and repair areas of new and old joints, cement-based penetrating crystalline waterproof coatings are injected into the cracks in the V-shaped grooves under high pressure, the V-shaped grooves are filled with existing rigid waterproofing, and glass fiber mesh and existing high-elasticity and high-toughness waterproof coatings are laid on the surface of the rigid waterproofing for anti-cracking treatment;

[0042] S4. Use cement-based penetrating crystalline waterproof coating mixed with mortar to powder-brush the wall construction area;

[0043] S5. After the powder batching is completed, hang glass fiber mesh cloth in the wall construction area;

[0044] S6. Use cement-based penetrating crystalline waterproof coating mixed with mortar to reinforce the wall construction area;

[0045] S7. Finally, use the existing moisture-proof and anti-condensation thermal insulation mortar to apply powder to the wall construction area to complete the wall waterproofing.

[0046] The present invention also provides a method for using a cement-based penetrating crystalline waterproof coating for ground waterproofing, which has the following characteristics: the method is applicable to any one of the above-mentioned cement-based penetrating crystalline waterproof coatings, comprising the following steps:

[0047] S1. Determine whether the ground area to be waterproofed is solid and firm. If the base surface is soft, it needs to be hammered down to the concrete base surface;

[0048] S2. Use a high-pressure water gun to wash the waterproof floor construction area to avoid affecting the waterproof penetration effect;

[0049] S3. V-shaped grooves are cut in the defective and old-new joint repair areas, and cement-based penetrating crystalline waterproof coatings are injected into the cracks in the V-shaped grooves under high pressure. The V-shaped grooves are filled with existing rigid waterproof coatings, and glass fiber mesh and existing high-elasticity and high-toughness waterproof coatings are laid on the surface of the rigid waterproof coatings for anti-cracking treatment to avoid cracking and leakage;

[0050] S4. Perform negative water pressure waterproofing or waterproof leveling treatment on the waterproof floor construction area, and lay wire mesh in the ground construction area;

[0051] S5. Mix cement-based penetrating crystalline waterproof coating with cement, yellow sand and gravel, then pour 3-5cm thick and press hard in the ground use area to complete ground waterproofing.

[0052] The cement-based penetrating crystallization waterproof coating of the present invention will dissolve silicate ions when used, and the silicate ions will penetrate and diffuse in the concrete along with the surface water, and chemically react with the calcium ions in the concrete to generate water-insoluble calcium silicate hydrates, i.e., dendrite-like crystals. The crystals fill the capillary pores and are combined with the concrete into a whole, blocking the capillary pores inside the concrete, thereby making the concrete dense and preventing water leakage.

[0053] In addition, the cement-based penetrating crystallization waterproof coating in the present invention has catalytic properties. Once it encounters water, it can continuously produce chemical reactions. The generated crystals continue to grow and fill the capillary pores inside the concrete. Therefore, even if the concrete structure is partially damaged and leaks, it will produce crystallization and heal itself after encountering water. It is most effective when used in cracks of 0.4mm.

[0054] Specifically, according to experiments, the crystals produced by the cement-based permeable crystallization waterproof coating of the present invention can repair cracks of 0.4 mm. Therefore, for cracks of 0.4 mm, it has the function of self-repair and healing, and does not need to do other waterproof layer repairs. It has the characteristics and performance of multiple anti-seepage and self-repair, and has extremely strong compressive resistance, up to 3.0 MPa, and the waterproof layer and the concrete surface form a complete system and will not separate. And the material can fully absorb the moisture on the surface of the concrete to participate in its crystallization reaction, and no hollowing phenomenon will occur. Because it is breathable and impermeable, it can be maintained synchronously with the concrete structure.

[0055] Functions and Effects of the Embodiments

[0056] According to the cement-based penetrating crystalline waterproof coating involved in the present invention, cement is used as the main film-forming component, and a suitable film-forming auxiliary agent is selected to increase the toughness of the cement-based penetrating crystalline waterproof coating, so that the concrete surface is strengthened, and the capillary pores and microcracks on the concrete surface are effectively blocked to prevent the invasion of external water and other harmful media; at the same time, a high-penetration complexing auxiliary agent and a complexing agent are introduced to penetrate into the interior of the concrete through a carrier, and a physical and chemical reaction occurs in the capillary pores to generate water-insoluble dendrite-like crystals, which seal the capillary pores and microcracks inside the concrete, and the rigid-flexible process is combined to effectively block the invasion of water from the outside, thereby playing a role of water blocking and waterproofing.

[0057] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A cement-based penetrating crystalline waterproof coating, characterized in that: The following components are included by weight percentage: Cement polymer powder 45-60%, silica powder 2.5-5%, complexing agent 1-2%, additive 2-4%, carbohydrate 5-10%, water 20-30%, The cement polymer powder includes silicate cement powder and sulphoaluminate cement powder, the siliceous powder includes fluorosilicic acid, silica fume, talc and quartz particles, the complexing agent includes butyl acrylate or polyacrylate, the auxiliary agent includes high-toughness resin, stearic acid or aluminum stearate, polyester acid vinyl ester or polyester acid vinyl adhesive, and the carbohydrate includes starch.

2. The cement-based penetrating crystallization waterproof coating according to claim 1, characterized in that: in, The ratio of the silicate cement powder to the sulphoaluminate cement powder is 8:

2.

3. The cement-based penetrating crystalline waterproof coating according to claim 1, characterized in that: in, The proportion of the fluorosilicic acid, silica fume, talcum powder and quartz particles is 1:1:3:

5.

4. The cement-based penetrating crystalline waterproof coating according to claim 1, characterized in that: in, The high-toughness resin, the stearic acid or the aluminum stearate, the polyester acid vinyl ester or the polyester acid vinyl adhesive account for a ratio of 6:3:

1.

5. A method for using a cement-based penetrating crystalline waterproof coating for wall waterproofing, characterized in that: The waterproof coating according to any one of claims 1 to 4 comprises the following steps: S1. Beat the base flour layer in the wall area where waterproofing is required until it reaches the concrete base; S2. Use a high-pressure water gun to wash the wall construction area to avoid affecting the waterproof penetration effect; S3. V-shaped grooves are cut for defects and repair areas of new and old joints, and the cement-based penetrating crystalline waterproof coating is injected into the cracks in the V-shaped grooves under high pressure. The V-shaped grooves are filled with existing rigid waterproof coatings, and glass fiber mesh and existing high-elasticity and high-toughness waterproof coatings are laid on the surface of the rigid waterproof coatings for anti-cracking treatment; S4, using the cement-based penetrating crystalline waterproof coating mixed mortar to powder the wall construction area; S5. After the powder batching is completed, hang glass fiber mesh cloth in the wall construction area; S6, using the cement-based penetrating crystalline waterproof coating mixed mortar to reinforce the wall construction area; S7. Finally, use the existing moisture-proof and anti-condensation thermal insulation mortar to apply powder to the wall construction area to complete the wall waterproofing.

6. A method for using a cement-based penetrating crystalline waterproof coating on the ground, characterized in that: The waterproof coating according to any one of claims 1 to 4 comprises the following steps: S1. Determine whether the ground area to be waterproofed is solid and firm. If the base surface is soft, it needs to be hammered down to the concrete base surface; S2. Use a high-pressure water gun to wash the waterproof floor construction area to avoid affecting the waterproof penetration effect; S3. V-shaped grooves are chiseled for defects and repair areas of new and old joints, and the cement-based penetrating crystalline waterproof coating is injected into the cracks in the V-shaped grooves under high pressure. The V-shaped grooves are filled with existing rigid waterproof coatings, and glass fiber mesh and existing high-elasticity and high-toughness waterproof coatings are laid on the surface of the rigid waterproof coatings for anti-cracking treatment to avoid cracking and leakage; S4. Perform negative water pressure waterproofing or waterproof leveling treatment on the waterproof floor construction area, and lay wire mesh in the ground construction area; S5. Mix the cement-based penetrating crystalline waterproof coating with cement, yellow sand and gravel, and then pour 3-5cm thick and press hard in the ground use area to complete ground waterproofing.

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