Waterproof, anti-crack and moisture-proof self-healing material for concrete structure and preparation method of self-healing material

Abstract

The invention discloses a waterproof, anti-crack and moisture-proof self-healing material for a concrete structure and a preparation method thereof, relates to the technical field of concrete, and aims to solve the problems that the mixing degree is poor and the waterproof and moisture-proof effects are reduced due to the fact that various aggregates for improving the strength are added to an existing concrete structure in order to improve the anti-crack strength. The concrete is prepared from the following raw materials by weight: 30%-50% of cement; 5%-30% of sand; 5%-30% of stones; 5%-20% of a reinforcing material; 5%-10% of polymer modified asphalt; 1%-5% of a water reducing agent; 1%-5% of an additive; 1%-5% of a chemical self-healing agent; 1%-5% of a foaming agent; the additive is one or more of a concrete expansive agent, a rapid hardening agent, a plasticizer, a polyurethane type flexible agent and a concrete retarder, and the reinforcing material is one or more of microfibers, slag, fly ash, silane ash and a cellulose material. The cellulose material is one or more of wood, hemp, polypropylene fiber and polyester fiber.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to a waterproof, crack-resistant and moisture-proof self-healing material for concrete structures and a preparation method thereof. Background Art

[0002] Concrete, abbreviated as concrete, is a general term for engineering composite materials that are cemented into a whole by cementitious materials. The term concrete usually refers to cement as a cementitious material, sand and stone as aggregates; mixed with water in a certain proportion, and the resulting cement concrete, also known as ordinary concrete, is widely used in civil engineering; For example, the Chinese patent with announcement number CN115806414A (a kind of crack-resistant concrete and its preparation method): comprises the following raw materials in parts by weight: 30-40 parts of cement, 10-15 parts of fly ash, 50-70 parts of recycled fine aggregate, 60-80 parts of recycled coarse aggregate, 1-5 parts of water reducer, 8-25 parts of mixed fiber, 5-12 parts of nickel-iron slag sand, 12-28 parts of composite material, and 15-25 parts of water; wherein the composite material is a composite of kenaf fiber and ultrafine calcium carbonate; and its preparation method is: cement, fly ash, recycled fine aggregate, recycled coarse aggregate, water reducer, mixed fiber, nickel-iron slag sand, composite material, and water are uniformly mixed to obtain crack-resistant concrete. The crack-resistant concrete of the present application has the advantage of improving the crack resistance of concrete through the synergistic effect between the raw materials.

[0003] In order to increase the crack resistance, existing concrete structures add a variety of strength-enhancing aggregates, which easily lead to poor mixing and reduce the waterproof and moisture-proof effect. To this end, we provide a waterproof, crack-resistant and moisture-proof self-healing material for concrete structures and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a waterproof, crack-resistant and moisture-proof self-healing material for concrete structures and a preparation method thereof, so as to solve the problem proposed in the above background technology that the existing concrete structures have added a variety of strength-increasing aggregates in order to increase the crack resistance, which easily results in poor mixing and reduces the waterproof and moisture-proof effect.

[0005] To achieve the above object, the present invention provides the following technical solution: a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following raw materials in a weight percentage ratio: Cement 30%-50%; Sand 5%-30%; Stone 5%-30%; Reinforcement material 5%-20%; Polymer modified asphalt 5%-10%; Water reducing agent 1%-5%; Admixture 1%-5%; Chemical self-healing agent 1%-5%; Foaming agent 1%-5%; Water 20%-50%.

[0006] Preferably, the admixture is one or more of a concrete expansion agent, a rapid hardener, a plasticizer, a polyurethane type flexible agent and a concrete retarder.

[0007] Preferably, the reinforcing material is one or more of microfiber, slag, fly ash, silane ash and cellulose material.

[0008] Preferably, the cellulose material is one or more of wood, hemp, polypropylene fiber and polyester fiber.

[0009] Preferably, a method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure comprises the following steps: Step 1: Add sand and gravel in proportion, then add reinforcing materials, mix the sand and gravel with half of the reinforcing materials to obtain an aggregate mixture; Step 2: Pour water into a mixing container, then pour the water reducer into the mixing container, start the mixing container, mix the water and the water reducer for 5 minutes, then add the chemical self-healing agent into the mixture and mix for 2 minutes. After the mixing is completed, take out the mixed liquid, put it into a storage container and seal it for standby use; Step 3: Mix the aggregate mixture and cement, and add the mixed liquid at a uniform speed while mixing. Stop adding after half of the mixture is added, and mix the aggregate mixture and the mixed liquid. After mixing for 5 minutes, add the remaining half of the reinforcing material, and add polymer modified asphalt to mix. While mixing, add half of the mixed liquid at a uniform speed and mix for 5 minutes. Step 4: Add the foaming agent to the mixture, add the admixtures in batches after 1 minute, and then add all the remaining mixed liquid to mix, and obtain concrete after mixing and molding.

[0010] Preferably, the mixing container in step 2 comprises a mixing tank, an upper cover is provided at the upper end of the mixing tank, a discharge port is provided at the lower surface of the mixing tank, and the discharge port and the mixing tank are an integral structure, a stirring shaft is provided inside the mixing tank, and stirring blades are provided outside the stirring shaft.

[0011] Preferably, a mounting sleeve is provided at the center of the lower end of the stirring blade, a stabilizing sleeve is provided at the center of the upper end of the stirring blade, and the mounting sleeve and the stabilizing sleeve are sleeved on the outside of the stirring shaft.

[0012] Preferably, a single-head fastener is provided at the lower end of the mounting sleeve, and the mounting sleeve is threadedly connected to the stirring shaft via the single-head fastener.

[0013] Preferably, a stirring motor is provided at the upper end of the stirring shaft, an upper cover is provided at the lower end of the mixing tank, a feed port is provided on the upper surface of the upper cover, the connection between the upper cover and the mixing tank is fixed by a connecting flange, support legs are provided at the lower ends of all four sides of the mixing tank, and the support legs are welded and fixed to the mixing tank.

[0014] Preferably, an inspection port is provided on one side surface of the mixing tank, a sealing cover is provided inside the inspection port, fixing plates are welded to the outer walls at both upper and lower ends of the sealing cover, a fixing bolt is provided at one end of the fixing plate, and the fixing plate is threadedly connected to the mixing tank via the fixing bolt.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds polymer modified asphalt, chemical self-healing agent and foaming agent in the process of concrete preparation. After the asphalt is added, the asphalt particles will fill the micropores and gaps in the concrete, increase the density of the concrete, thereby improving the compressive strength, and enhance the compressive strength of the concrete. The asphalt itself has good waterproof performance. After the asphalt is added, the pores and gaps in the concrete can be filled, thereby improving the anti-seepage performance of the concrete. The chemical self-healing agent refers to a certain amount of chemical materials added to the concrete. When the concrete is cracked or damaged, these chemical materials will form filling substances through chemical reactions to fill and repair the cracks, thereby achieving the self-healing effect of the concrete and improving the service life of the concrete. In addition, by adding the foamed foaming agent, a structure containing a large number of closed pores is formed through natural curing, which has an internal stabilizing effect on the concrete mixed with multiple materials, and is not easy to crack and damage. At the same time, the structure with a large number of closed pores also has a waterproof and moisture-proof effect, thereby achieving the improvement of multiple functions of the concrete.

[0016] By setting a quick hardener, a polyurethane-type flexible agent and a concrete retarder in the admixture, the concrete retarder is added first to delay the setting time of the concrete, so as to facilitate the long-term preparation of the concrete. Then, the quick hardener is added to promote the formation of bubbles and pores inside the concrete, and the porosity inside the concrete is increased. These pores can provide more hydration reaction surfaces, and accelerate the solidification and hardening process of the concrete. Finally, the polyurethane-type flexible agent is added to fill the cracks and micropores on the surface of the concrete, thereby improving the density and firmness of the concrete, so that the strength of the concrete is improved and the anti-cracking effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the preparation process of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3It is a schematic diagram of the stirring blade structure of the present invention; Figure 4 This is a schematic diagram of the bottom view of the structure of the connection between the mounting sleeve and the stirring shaft of the present invention.

[0018] In the figure: 1. mixing tank; 2. discharge port; 3. supporting legs; 4. upper cover; 5. connecting flange; 6. feed port; 7. stirring motor; 8. inspection port; 9. sealing cover; 10. fixing plate; 11. fixing bolts; 12. stirring shaft; 13. stirring blades; 14. mounting sleeve; 15. stabilizing sleeve; 16. single-head fastener. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example 1

[0020] See also Figure 1-4 , an embodiment provided by the present invention: a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following raw materials in a weight percentage ratio: Cement 30%; Sand 10%; Stone 10%; Silane ash 5%; Polypropylene fiber 5%; Polymer modified asphalt 8%; Water reducing agent 1%; Rapid hardener 1%; Polyurethane type flexible agent 1%; Concrete retarder 1%; Chemical self-healing agent 3%; Foaming agent 5%; Water 20%.

[0021] See also Figure 1 , a method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following steps: Step 1: Add sand and gravel in proportion, then add reinforcing materials, mix the sand and gravel with half of the reinforcing materials to obtain an aggregate mixture; Step 2: Pour water into a mixing container, then pour the water reducer into the mixing container, start the mixing container, mix the water and the water reducer for 5 minutes, then add the chemical self-healing agent into the mixture and mix for 2 minutes. After the mixing is completed, take out the mixed liquid, put it into a storage container and seal it for standby use; Step 3: Mix the aggregate mixture and cement, and add the mixed liquid at a uniform speed while mixing. Stop adding after half of the mixture is added, and mix the aggregate mixture and the mixed liquid. After mixing for 5 minutes, add the remaining half of the reinforcing material, and add polymer modified asphalt to mix. While mixing, add half of the mixed liquid at a uniform speed and mix for 5 minutes. Step 4: Add the foaming agent to the mixture, add the admixtures in batches after 1 minute, and then add all the remaining mixed liquid to mix, and obtain concrete after mixing and molding.

[0022] See also Figure 1-4 The mixing container in step 2 includes a mixing tank 1, an upper cover 4 is provided at the upper end of the mixing tank 1, a discharge port 2 is provided on the lower surface of the mixing tank 1, and the discharge port 2 is an integral structure with the mixing tank 1, a stirring shaft 12 is provided inside the mixing tank 1, a stirring blade 13 is provided outside the stirring shaft 12, a mounting sleeve 14 is provided at the center of the lower end of the stirring blade 13, a stabilizing sleeve 15 is provided at the center of the upper end of the stirring blade 13, and the mounting sleeve 14 and the stabilizing sleeve 15 are sleeved on the outside of the stirring shaft 12, a single-head fastener 16 is provided at the lower end of the mounting sleeve 14, and the mounting sleeve 14 is threadedly connected to the stirring shaft 12 through the single-head fastener 16. A stirring motor 7 is provided at the upper end of the stirring shaft 12, an upper cover 4 is provided at the lower end of the mixing tank 1, a feed port 6 is provided on the upper surface of the upper cover 4, the connection between the upper cover 4 and the mixing tank 1 is fixed by a connecting flange 5, support legs 3 are provided at the lower ends of the four sides of the mixing tank 1, and the support legs 3 are welded and fixed to the mixing tank 1, an inspection port 8 is provided on one side surface of the mixing tank 1, a sealing cover 9 is provided inside the inspection port 8, fixing plates 10 are welded on the outer walls at both ends of the sealing cover 9, a fixing bolt 11 is provided at one end of the fixing plate 10, and the fixing plate 10 is threadedly connected to the mixing tank 1 through the fixing bolt 11.

[0023] Effect table of raw material ratio Example 2

[0024] See also Figure 1-4 , an embodiment provided by the present invention: a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following raw materials in a weight percentage ratio: Cement 30%; Sand 10%; Stone 10%; Silane ash 5%; Propylene fiber 5%; Polymer modified asphalt 10%; Water reducing agent 2%; Rapid hardener 1%; Polyurethane type flexible agent 1%; Concrete retarder 1%; Chemical self-healing agent 3%; Foaming agent 2%; Water 20%.

[0025] See also Figure 1 , a method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following steps: Step 1: Add sand and gravel in proportion, then add reinforcing materials, mix the sand and gravel with half of the reinforcing materials to obtain an aggregate mixture; Step 2: Pour water into a mixing container, then pour the water reducer into the mixing container, start the mixing container, mix the water and the water reducer for 5 minutes, then add the chemical self-healing agent into the mixture and mix for 2 minutes. After the mixing is completed, take out the mixed liquid, put it into a storage container and seal it for standby use; Step 3: Mix the aggregate mixture and cement, and add the mixed liquid at a uniform speed while mixing. Stop adding after half of the mixture is added, and mix the aggregate mixture and the mixed liquid. After mixing for 5 minutes, add the remaining half of the reinforcing material, and add polymer modified asphalt to mix. While mixing, add half of the mixed liquid at a uniform speed and mix for 5 minutes. Step 4: Add the foaming agent to the mixture, add the admixtures in batches after 1 minute, and then add all the remaining mixed liquid to mix, and obtain concrete after mixing and molding.

[0026] See also Figure 1-4 The mixing container in step 2 includes a mixing tank 1, an upper cover 4 is provided at the upper end of the mixing tank 1, a discharge port 2 is provided on the lower surface of the mixing tank 1, and the discharge port 2 is an integral structure with the mixing tank 1, a stirring shaft 12 is provided inside the mixing tank 1, a stirring blade 13 is provided outside the stirring shaft 12, a mounting sleeve 14 is provided at the center of the lower end of the stirring blade 13, a stabilizing sleeve 15 is provided at the center of the upper end of the stirring blade 13, and the mounting sleeve 14 and the stabilizing sleeve 15 are sleeved on the outside of the stirring shaft 12, a single-head fastener 16 is provided at the lower end of the mounting sleeve 14, and the mounting sleeve 14 is threadedly connected to the stirring shaft 12 through the single-head fastener 16. A stirring motor 7 is provided at the upper end of the stirring shaft 12, an upper cover 4 is provided at the lower end of the mixing tank 1, a feed port 6 is provided on the upper surface of the upper cover 4, the connection between the upper cover 4 and the mixing tank 1 is fixed by a connecting flange 5, support legs 3 are provided at the lower ends of the four sides of the mixing tank 1, and the support legs 3 are welded and fixed to the mixing tank 1, an inspection port 8 is provided on one side surface of the mixing tank 1, a sealing cover 9 is provided inside the inspection port 8, fixing plates 10 are welded on the outer walls at both ends of the sealing cover 9, a fixing bolt 11 is provided at one end of the fixing plate 10, and the fixing plate 10 is threadedly connected to the mixing tank 1 through the fixing bolt 11.

[0027] Effect table of raw material ratio

[0028] Compared with Example 1, without changing the weight ratio of cement, sand, gravel, silane ash, propylene fiber, water, quick hardener, polyurethane flexible agent, concrete retarder and chemical self-healing agent, polymer modified asphalt and water reducing agent are added and the foaming agent is reduced, thereby improving the crack resistance and moisture resistance. Example 3

[0029] See also Figure 1-4 , an embodiment provided by the present invention: a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following raw materials in a weight percentage ratio: Cement 30%; Sand 10%; Stone 10%; Microfiber 5%; Slag 2%; Fly ash 3%; Polymer modified asphalt 10%; Water reducing agent 1%; Rapid hardener 1%; Polyurethane type flexible agent 2%; Concrete retarder 1%; Chemical self-healing agent 4%; Foaming agent 1%; Water 20%.

[0030] See also Figure 1 , a method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, comprising the following steps: Step 1: Add sand and gravel in proportion, then add reinforcing materials, mix the sand and gravel with half of the reinforcing materials to obtain an aggregate mixture; Step 2: Pour water into a mixing container, then pour the water reducer into the mixing container, start the mixing container, mix the water and the water reducer for 5 minutes, then add the chemical self-healing agent into the mixture and mix for 2 minutes. After the mixing is completed, take out the mixed liquid, put it into a storage container and seal it for standby use; Step 3: Mix the aggregate mixture and cement, and add the mixed liquid at a uniform speed while mixing. Stop adding after half of the mixture is added, and mix the aggregate mixture and the mixed liquid. After mixing for 5 minutes, add the remaining half of the reinforcing material, and add polymer modified asphalt to mix. While mixing, add half of the mixed liquid at a uniform speed and mix for 5 minutes. Step 4: Add the foaming agent to the mixture, add the admixtures in batches after 1 minute, and then add all the remaining mixed liquid to mix, and obtain concrete after mixing and molding.

[0031] See also Figure 1-4 The mixing container in step 2 includes a mixing tank 1, an upper cover 4 is provided at the upper end of the mixing tank 1, a discharge port 2 is provided on the lower surface of the mixing tank 1, and the discharge port 2 is an integral structure with the mixing tank 1, a stirring shaft 12 is provided inside the mixing tank 1, a stirring blade 13 is provided outside the stirring shaft 12, a mounting sleeve 14 is provided at the center of the lower end of the stirring blade 13, a stabilizing sleeve 15 is provided at the center of the upper end of the stirring blade 13, and the mounting sleeve 14 and the stabilizing sleeve 15 are sleeved on the outside of the stirring shaft 12, a single-head fastener 16 is provided at the lower end of the mounting sleeve 14, and the mounting sleeve 14 is threadedly connected to the stirring shaft 12 through the single-head fastener 16. A stirring motor 7 is provided at the upper end of the stirring shaft 12, an upper cover 4 is provided at the lower end of the mixing tank 1, a feed port 6 is provided on the upper surface of the upper cover 4, the connection between the upper cover 4 and the mixing tank 1 is fixed by a connecting flange 5, support legs 3 are provided at the lower ends of the four sides of the mixing tank 1, and the support legs 3 are welded and fixed to the mixing tank 1, an inspection port 8 is provided on one side surface of the mixing tank 1, a sealing cover 9 is provided inside the inspection port 8, fixing plates 10 are welded on the outer walls at both ends of the sealing cover 9, a fixing bolt 11 is provided at one end of the fixing plate 10, and the fixing plate 10 is threadedly connected to the mixing tank 1 through the fixing bolt 11.

[0032] Effect table of raw material ratio

[0033] Compared with Example 2, without changing the weight ratio of cement, sand, gravel, polymer modified asphalt, quick hardener, concrete retarder and water, silane ash and propylene fiber are replaced with microfiber, slag and fly ash, the total weight ratio remains unchanged, and the water reducing agent and foaming agent are reduced, while the polyurethane type flexible agent and chemical self-healing agent are increased, thereby improving the waterproof effect and self-healing effect, and reducing the moisture-proof effect.

[0034] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A waterproof, crack-resistant and moisture-proof self-healing material for concrete structures, characterized by: The invention is made of the following raw materials in weight percentage ratio: Cement 30%-50%; Sand 5%-30%; Stone 5%-30%; Reinforcement material 5%-20%; Polymer modified asphalt 5%-10%; Water reducing agent 1%-5%; Admixture 1%-5%; Chemical self-healing agent 1%-5%; Foaming agent 1%-5%; Water 20%-50%.

2. The waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 1, characterized in that: The admixture is one or more of a concrete expansion agent, a rapid hardener, a plasticizer, a polyurethane type flexible agent and a concrete retarder.

3. The waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 2, characterized in that: The reinforcing material is one or more of microfiber, slag, fly ash, silane ash and cellulose material.

4. The waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 3, characterized in that: The cellulose material is one or more of wood, hemp, polypropylene fiber and polyester fiber.

5. A method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure, based on the waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 4, characterized in that: The following steps are involved: Step 1: Add sand and gravel in proportion, then add reinforcing materials, mix the sand and gravel with half of the reinforcing materials to obtain an aggregate mixture; Step 2: Pour water into a mixing container, then pour the water reducer into the mixing container, start the mixing container, mix the water and the water reducer for 5 minutes, then add the chemical self-healing agent into the mixture and mix for 2 minutes. After the mixing is completed, take out the mixed liquid, put it into a storage container and seal it for standby use; Step 3: Mix the aggregate mixture and cement, and add the mixed liquid at a uniform speed while mixing. Stop adding after half of the mixture is added, and mix the aggregate mixture and the mixed liquid. After mixing for 5 minutes, add the remaining half of the reinforcing material, and add polymer modified asphalt to mix. While mixing, add half of the mixed liquid at a uniform speed and mix for 5 minutes. Step 4: Add the foaming agent to the mixture, add the admixtures in batches after 1 minute, and then add all the remaining mixed liquid to mix, and obtain concrete after mixing and molding.

6. The method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 5, characterized in that: The mixing container in step 2 comprises a mixing tank (1), wherein an upper cover (4) is arranged at the upper end of the mixing tank (1), a discharge port (2) is arranged at the lower surface of the mixing tank (1), and the discharge port (2) and the mixing tank (1) are an integral structure, a stirring shaft (12) is arranged inside the mixing tank (1), and a stirring blade (13) is arranged outside the stirring shaft (12).

7. The method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 6, characterized in that: A mounting sleeve (14) is provided at the center of the lower end of the stirring blade (13), a stabilizing sleeve (15) is provided at the center of the upper end of the stirring blade (13), and the mounting sleeve (14) and the stabilizing sleeve (15) are sleeved on the outside of the stirring shaft (12).

8. The method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 7, characterized in that: A single-head fastener (16) is provided at the lower end of the mounting sleeve (14), and the mounting sleeve (14) is threadedly connected to the stirring shaft (12) via the single-head fastener (16).

9. The method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 8, characterized in that: A stirring motor (7) is provided at the upper end of the stirring shaft (12), an upper cover (4) is provided at the lower end of the mixing tank (1), a feed port (6) is provided on the upper surface of the upper cover (4), the connection between the upper cover (4) and the mixing tank (1) is fixed by a connecting flange (5), and support legs (3) are provided at the lower ends of four sides of the mixing tank (1), and the support legs (3) are fixed to the mixing tank (1) by welding.

10. The method for preparing a waterproof, crack-resistant and moisture-proof self-healing material for concrete structure according to claim 9, characterized in that: A maintenance opening (8) is provided on one side surface of the mixing tank (1), a sealing cover (9) is provided inside the maintenance opening (8), fixing plates (10) are welded to the outer walls at both upper and lower ends of the sealing cover (9), a fixing bolt (11) is provided at one end of the fixing plate (10), and the fixing plate (10) is threadedly connected to the mixing tank (1) via the fixing bolt (11).

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