Preparation method of slow-release foaming cement-based grouting material

Abstract

The invention discloses a preparation method of a slow-release foaming cement-based grouting material, and belongs to the technical field of building materials. The slow-release foamed cement-based grouting material comprises the following raw materials in parts by mass: 800-900 parts of a cementing material, 100-200 parts of heavy calcium carbonate powder, 5-15 parts of a foaming agent, 4-6 parts of a catalyst, 8-10 parts of calcium stearate, 0.1-0.2 part of a foam stabilizer, 0.1-0.5 part of a coating agent, 1-5 parts of a water reducing agent, 0-0.5 part of a coagulant, 0-8 parts of an early strength agent, 0-5 parts of polypropylene fibers, 2-10 parts of redispersible latex powder and 300-350 parts of water. The slow-release foaming cement-based grouting material disclosed by the invention can react and foam after slurry is stirred and grouting is completed, so that the early strength of the material can be improved, and the requirement of rapid repair of a road can be met.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a method for preparing a slow-release foaming cement-based grouting material. Background Art

[0002] In recent years, with the continuous improvement of road traffic infrastructure construction, the role of highway maintenance in the development of the transportation industry has gradually increased, and the tasks of road maintenance, repair, reconstruction and reinforcement at all levels have become increasingly heavy. With the continuous increase in the service life, road cracks, foundation subsidence, bridge head jump and other diseases have gradually emerged. When problems occur in the roadbed and pavement, grouting can be used to repair them. It is easy to operate, requires little construction, and can quickly restore traffic. It has gradually been favored by engineering personnel and has become the main means of roadbed reinforcement and maintenance projects.

[0003] The most commonly used cement-based grouting material is ordinary cement. However, ordinary cement has a large particle size, poor fluidity, and a large self-weight and rapid sedimentation, and the grouting effect on small cracks needs to be improved. Therefore, seeking a grouting material that can adapt to rapid repair is of great significance for strengthening and maintaining the performance and durability of roadbed.

[0004] The rapid reinforcement and repair technology of roadbed needs to meet the following requirements: fast strength formation, simple process, energy saving and environmental protection, and long service life. The commonly used roadbed repair grouting materials are usually filled when they start to react after mixing, which brings great inconvenience to the construction operation.

[0005] At present, some literature has conducted some research on the technology of foamed cement grouting to repair roadbed. Air is introduced into cement slurry through physical or chemical foaming to form tiny bubbles. The pore structure formed after the bubbles solidify greatly reduces the density of the material, making it lightweight and earthquake-resistant. It reduces the density of the slurry and enables the slurry to self-expand and fill the gaps in tiny gaps. However, the performance of traditional foamed cement grouting depends greatly on the ratio of materials, the selection of foaming agents, and the mixing process; the operation process of physical foamed cement is relatively cumbersome, and foam needs to be prepared and introduced into the cement slurry before the slurry is mixed, which has high requirements for construction conditions; chemical foamed cement has high requirements for the selection of foaming components, and the gas production strength of the foaming agent needs to match the fluidity of the slurry, otherwise it will cause bubbles of different sizes and uneven distribution, affecting the quality of grouting repair. In addition, traditional foamed cement grouting begins to react and expand during mixing. Early foaming may cause uneven distribution of bubbles, affecting the expansion strength of the repair slurry. After grouting, it cannot expand to fill dark gaps in roadbed defects. In addition, the density of cement slurry is relatively large, and the preparation procedure is relatively cumbersome, which makes it difficult to meet the requirements of rapid road repairs.

[0006] Based on this, it is necessary to find a slow-release foaming grouting foaming cement material that can self-expand after grouting and has the characteristics of light texture and early strength to meet the requirements of rapid road repair. Summary of the invention

[0007] The purpose of the present invention is to provide a high-elastic waterproof coating based on functional modified rubber and a preparation method and application thereof, so as to solve the problems existing in the above-mentioned prior art.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] One of the technical solutions of the present invention: a slow-release foaming cement-based grouting material, comprising the following raw materials in parts by weight: 800-900 parts of cementitious material, 100-200 parts of heavy calcium powder, 5-15 parts of foaming agent, 4-6 parts of catalyst, 8-10 parts of calcium stearate, 0.1-0.2 parts of foam stabilizer, 0.1-0.5 parts of coating agent, 1-5 parts of water reducer, 0-0.5 parts of coagulant, 0-8 parts of early strength agent, 0-5 parts of polypropylene fiber, 2-10 parts of redispersible latex powder and 300-350 parts of water.

[0010] Furthermore, the slow-release foamed cement-based grouting material comprises the following raw materials in parts by mass: 900 parts of cementitious material, 100 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.25 parts of coating agent, 3 parts of water reducer, 0.2 parts of coagulant, 8 parts of early strength agent, 4 parts of polypropylene fiber, 10 parts of redispersible latex powder and 338 parts of water.

[0011] Furthermore, the coating agent includes a titanate coupling agent.

[0012] Furthermore, the titanate coupling agent includes one or more of a fatty acid ester coupling agent, a phosphate coupling agent and a pyrophosphate coupling agent; the titanate coupling agent can delay foaming after adding water to the foaming component, thereby meeting the requirement of foaming after grouting.

[0013] Furthermore, the catalyst comprises manganese dioxide particles.

[0014] Furthermore, the particle size of the manganese dioxide particles is 100-150 meshes.

[0015] Further, the cementitious material includes aluminate cement CA50;

[0016] Furthermore, the alumina content of the aluminate cement CA50 is 51.05%, and the specific surface area is 397m 2 / kg;

[0017] Furthermore, the particle size of the heavy calcium powder is 800-1250 mesh;

[0018] Further, the foaming agent includes hydrogen peroxide particles;

[0019] Furthermore, the particle size of the hydrogen peroxide particles is 100 to 150 meshes;

[0020] Further, the foam stabilizer includes hydroxymethyl cellulose ether;

[0021] Further, the water reducing agent includes a polycarboxylic acid water reducing agent;

[0022] Further, the coagulant comprises lithium carbonate;

[0023] Furthermore, the early strength agent is selected from one of calcium chloride, calcium formate and sodium sulfate; calcium chloride can improve the setting time of the material and increase the early strength.

[0024] Furthermore, the length of the polypropylene fiber is 8 to 12 mm; the polypropylene fiber can improve the flexural strength of the material and enhance the crack resistance of the material.

[0025] Furthermore, the particle size of the redispersible latex powder is 400-1250 meshes; the redispersible latex powder can improve the toughness of the material and reduce the water absorption rate.

[0026] Heavy calcium powder and early strength agent can stabilize the long-term strength of the material and improve the early strength.

[0027] The second technical solution of the present invention is a method for preparing the above-mentioned slow-release foamed cement-based grouting material, comprising the following steps:

[0028] The coating agent is added into water and dispersed evenly, and then the catalyst is added, mixed evenly, and then dried and ground to obtain the modified catalyst;

[0029] The modified catalyst, gelling material, heavy calcium powder and raw materials other than water are uniformly mixed to prepare an admixture;

[0030] The gelling material and heavy calcium powder are mixed evenly, an admixture and a modified catalyst are added and mixed evenly, and then water is added and mixed evenly to obtain the slow-release foaming cement-based grouting material.

[0031] Furthermore, the grinding is grinding to a particle size of 100 to 300 meshes.

[0032] The present invention uses a coating agent to modify the foaming component (manganese dioxide particles) of the foamed cement, so that the foaming reaction can begin after the slurry is stirred and grouting is completed; in terms of strength, the early strength of the material is improved by adding an early strength agent, which is more conducive to ensuring the strength stability of the grouting material under different temperature conditions; heavy calcium powder is added to stabilize the long-term strength of the material; in terms of durability, the toughness of the material is improved and the water absorption rate of the material is reduced by adding redispersible latex powder and polypropylene fiber.

[0033] The third technical solution of the present invention: an application of the above-mentioned slow-release foamed cement-based grouting material in road maintenance and repair.

[0034] The present invention discloses the following technical effects:

[0035] (1) The slow-release foaming cement-based grouting material of the present invention can start to react and foam after the slurry is stirred and grouting is completed, which can improve the early strength of the material and meet the requirements of rapid road repair.

[0036] (2) The slow-release foamed cement-based grouting material of the present invention has light texture, low water absorption, high early strength, and good flexural strength and toughness. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0038] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0039] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0040] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0041] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0042] The “parts” described in the following examples are all “parts by mass”.

[0043] Example 1

[0044] A method for preparing a slow-release foamed cement-based grouting material:

[0045] (1) The slow-release foaming cement-based grouting material is composed of the following raw materials in parts by weight: 900 parts of cementitious material, 100 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.25 parts of coating agent, 3 parts of water reducer, 0.2 parts of coagulant, 8 parts of early strength agent, 4 parts of polypropylene fiber, 10 parts of redispersible latex powder and 338 parts of water.

[0046] The cementitious material is aluminate cement CA50, with an alumina content of 51.05% and a specific surface area of ​​397m 2 / kg;

[0047] The particle size of heavy calcium powder is 800 mesh;

[0048] The foaming agent is hydrogen peroxide particles with a particle size of 150 mesh;

[0049] The catalyst is manganese dioxide particles with a particle size of 150 mesh;

[0050] Foam stabilizer hydroxymethyl cellulose ether;

[0051] The coating agent is a monoalkoxy fatty acid ester type coupling agent (monoalkoxy fatty acid ester titanate coupling agent cs-101 (tts));

[0052] The water reducing agent is a polycarboxylic acid water reducing agent;

[0053] The coagulant is lithium carbonate;

[0054] The early strength agent is calcium chloride;

[0055] The length of polypropylene fiber is 8 to 12 mm;

[0056] The particle size of the redispersible latex powder is 400 mesh.

[0057] (2) Preparation of slow-release foamed cement-based grouting material:

[0058] A. First, dilute the coating agent with water, add the catalyst (manganese dioxide particles) in the container and stir evenly to form a mixed solution, then put it into a 100°C oven for drying, put it into a ball mill for crushing, and pass it through a 150-mesh sieve to obtain the modified catalyst.

[0059] B. Evenly mix the modified catalyst, gelling material, heavy calcium powder and raw materials other than water to prepare an admixture.

[0060] C. Mix the cementitious material and heavy calcium powder evenly, add the admixture and the modified catalyst, mix evenly, add them into a mixer together with water, stir evenly, and obtain a slow-release foaming cement-based grouting material.

[0061] Example 2

[0062] The same as Example 1, except that the slow-release foamed cement-based grouting material is composed of the following raw materials in parts by mass: 850 parts of cementitious material, 150 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.2 parts of coating agent, 3 parts of water reducer, 0.2 parts of coagulant, 8 parts of early strength agent, 3 parts of polypropylene fiber, 8 parts of redispersible latex powder and 330 parts of water.

[0063] Example 3

[0064] The same as Example 1, except that the slow-release foamed cement-based grouting material is composed of the following raw materials in parts by mass: 900 parts of cement, 100 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.15 parts of coating agent, 3 parts of water reducer, 0.2 parts of coagulant, 2 parts of polypropylene fiber, 6 parts of redispersible latex powder and 330 parts of water.

[0065] Example 4

[0066] The same as Example 1, except that the slow-release foamed cement-based grouting material is composed of the following raw materials in parts by mass: 900 parts of cement, 100 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.1 parts of coating agent, 3 parts of water reducer, 0.2 parts of coagulant, 8 parts of early strength agent, 4 parts of redispersible latex powder and 330 parts of water.

[0067] Example 5

[0068] The same as Example 1, except that the slow-release foamed cement-based grouting material is composed of the following raw materials in parts by mass: 900 parts of cement, 100 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.25 parts of coating agent, 3 parts of water reducer, 8 parts of early strength agent, 2 parts of polypropylene fiber, 5 parts of redispersible latex powder and 330 parts of water.

[0069] The slow-release foamed cement-based grouting material prepared in Examples 1 to 5 was injected into a 40 mm × 40 mm × 160 mm mold and cured in a curing box at a temperature of 20 ± 5 ° C and a humidity of 90%. The physical and mechanical properties of the test pieces prepared in Examples 1 to 5 were tested. The results are shown in Table 1.

[0070] Table 1 Physical and mechanical properties

[0071]

[0072]

[0073] Comparative Example 1

[0074] The same as Example 1, except that (1) the slow-release foamed cement-based grouting material is composed of the following raw materials in parts by weight: 900 parts of cementitious material, 100 parts of heavy calcium powder, 10 parts of foaming agent, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 3 parts of water reducer, 0.2 parts of coagulant, 8 parts of early strength agent, 4 parts of polypropylene fiber, 10 parts of redispersible latex powder and 338 parts of water.

[0075] (2) Preparation of slow-release foamed cement-based grouting material:

[0076] A. Evenly mix the cementitious material, heavy calcium powder and raw materials other than water to prepare an admixture.

[0077] B. Mix the cementitious material and heavy calcium powder evenly, add the admixture and mix evenly, then add it into the mixer together with water and stir evenly to obtain the foamed cement grouting material.

[0078] Comparative Example 2

[0079] Same as Example 1, except that the coating agent is sodium alginate.

[0080] The cement-based grouting materials obtained in Comparative Examples 1 and 2 were prepared into test pieces according to the above method and their physical and mechanical properties were tested. The results are shown in Table 2.

[0081] Table 2 Physical and mechanical properties

[0082]

[0083] In Comparative Example 1, no catalyst was added, and the slurry had basically no expansion, so the dry density was relatively high, and it was a mortar specimen with relatively high strength, but it could not fill the dark voids well.

[0084] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A slow-release foamed cement-based grouting material, characterized in that: The invention comprises the following raw materials in parts by weight: 800-900 parts of cementitious material, 100-200 parts of heavy calcium powder, 5-15 parts of foaming agent, 4-6 parts of catalyst, 8-10 parts of calcium stearate, 0.1-0.2 parts of foam stabilizer, 0.1-0.5 parts of coating agent, 1-5 parts of water reducer, 0-0.5 parts of coagulant, 0-8 parts of early strength agent, 0-5 parts of polypropylene fiber, 2-10 parts of redispersible latex powder and 300-350 parts of water.

2. The slow-release foamed cement-based grouting material according to claim 1, characterized in that: It includes the following raw materials in parts by mass: 900 parts of gelling material, 100 parts of heavy calcium powder, 10 parts of foaming agent, 6 parts of catalyst, 10 parts of calcium stearate, 0.1 parts of foam stabilizer, 0.25 parts of coating agent, 3 parts of water reducer, 0.2 parts of coagulant, 8 parts of early strength agent, 4 parts of polypropylene fiber, 10 parts of redispersible latex powder and 338 parts of water.

3. The slow-release foamed cement-based grouting material according to claim 1, characterized in that: The coating agent includes a titanate coupling agent.

4. The slow-release foamed cement-based grouting material according to claim 3, characterized in that: The titanate coupling agent includes one or more of a fatty acid ester coupling agent, a phosphate coupling agent and a pyrophosphate coupling agent.

5. The slow-release foamed cement-based grouting material according to claim 1, characterized in that: The catalyst includes manganese dioxide particles.

6. A method for preparing the slow-release foamed cement-based grouting material according to any one of claims 1 to 5, characterized in that: The following steps are involved: The coating agent is added into water and dispersed evenly, and then the catalyst is added, mixed evenly, and then dried and ground to obtain the modified catalyst; The modified catalyst, gelling material, heavy calcium powder and raw materials other than water are uniformly mixed to prepare an admixture; The gelling material and heavy calcium powder are mixed evenly, an admixture and a modified catalyst are added and mixed evenly, and then water is added and mixed evenly to obtain the slow-release foaming cement-based grouting material.

7. The preparation method according to claim 6, characterized in that: The grinding is grinding to a particle size of 100 to 300 meshes.

8. Use of the slow-release foamed cement-based grouting material according to any one of claims 1 to 5 in road maintenance and repair.

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