A rapid repair material and construction method for emergency repair and reconstruction

Abstract

This invention relates to the field of cement-based composite materials technology, and in particular to a rapid repair material and construction method for emergency repairs and reconstruction, to alleviate the problems of long curing time for existing inorganic repair materials and insufficient strength of organic repair materials. In this repair material, the inorganic cementitious material and organic adhesive are extruded separately into the gaps to be repaired in a ring-shaped manner, with the organic adhesive located outside the inorganic cementitious material. A spherical injection head is provided at the outlet of the inner injection cylinder of the extrusion device, allowing the inorganic cementitious material to enter the interior of the organic adhesive in a spray form, forming a fibrous structure. The fibers increase the pinning effect, preventing interfacial slippage between the cementitious material and the organic adhesive, and improving the overall bonding performance.

Description

Technical Field

[0001] This invention relates to the field of cement-based composite materials technology, and in particular to a rapid repair material and construction method for emergency repair and reconstruction. Background Technology

[0002] The main inorganic binders are ordinary silicate cement and lime powder or quicklime powder. The pH value of these inorganic binders after adding water is 13 or 14, which is very alkaline. Moreover, due to the high bonding strength, brittleness, drying shrinkage and carbonation shrinkage of lime mortar, it is easy to cause cracking and blistering of the mortar layer after drying. It is also easy to cause the mesh cloth in the plastering mortar layer of the external insulation system to break, the plaster layer to fall off, and the surface coating to effloresce. When pasting granite, marble and other materials, it is easy to cause staining and dampness on the stone surface.

[0003] In addition, a well-known problem with inorganic cementitious materials is that they require a certain curing time, have a long setting time, and are prone to falling off in the event of secondary damage such as earthquakes, making them unsuitable for emergency repairs and reconstruction.

[0004] Many excellent organic adhesives have good adhesion properties, but they are expensive and lack strength. For example, polyurethane foam is prone to uneven surfaces due to different degrees of foaming in different directions, making it unsuitable for permanent repairs. Summary of the Invention

[0005] This invention provides a rapid repair material and construction method for emergency repairs and reconstruction, in order to alleviate the problems of long curing time of existing inorganic repair materials and insufficient strength of organic repair materials.

[0006] To alleviate the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] A rapid repair material for emergency repairs and reconstruction includes:

[0008] Inorganic cementitious material and organic adhesive are extruded into the gap to be repaired in sections by annular extrusion, with the organic adhesive located outside the inorganic cementitious material.

[0009] The inorganic cementitious material is composed of the following parts by weight:

[0010] 10-15 parts of ordinary Portland cement;

[0011] 9-10 parts fly ash;

[0012] 1.2-3 parts of microsilica powder;

[0013] 8-10 parts water;

[0014] 24-30 parts sand;

[0015] 20-30 parts crushed stone;

[0016] Early-strength agent 0.5-2 parts;

[0017] 0.1-0.3 parts of polycarboxylate superplasticizer.

[0018] Furthermore,

[0019] The organic adhesive is one or more of the following: fast-curing resin materials, epoxy resin, polyurethane, and polyurea.

[0020] Furthermore,

[0021] Polyurethane is modified with a silane coupling agent.

[0022] Furthermore,

[0023] The silane coupling agent is at least one of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and γ-aminopropyltrimethoxysilane.

[0024] Furthermore,

[0025] The volume ratio of organic adhesive to inorganic cementitious material is (2-5):1.

[0026] A construction method for using rapid repair materials in emergency repair and reconstruction.

[0027] The injection is performed using a zoned injection mechanism, which has an annular injection head.

[0028] The inorganic cementitious material and organic adhesive are extruded into the gap to be repaired in a ring-shaped manner through a zoned injection mechanism, with the organic adhesive located outside the inorganic cementitious material.

[0029] Furthermore,

[0030] The partitioned injection mechanism includes: a central injection cylinder and an outer injection cylinder arranged concentrically with the central injection cylinder;

[0031] The intermediate injection cylinder is used to inject inorganic cementitious materials;

[0032] The outer injection cylinder is used to inject organic adhesives.

[0033] Furthermore,

[0034] The outer injection cylinder outlet edge is provided with an inwardly inclined guide plate.

[0035] Furthermore,

[0036] The lower part of the intermediate injection cylinder is provided with a spherical injection head, and the spherical injection head has a small hole.

[0037] Furthermore,

[0038] Includes the following steps:

[0039] Inject the inorganic cementitious material into the intermediate injection cylinder;

[0040] Inject the organic adhesive into the outer injection cylinder;

[0041] First, the outer injection cylinder is driven continuously, then the inner injection cylinder is driven continuously, and finally the repair device is moved laterally so that the guide plate of the outer injection cylinder scrapes the crack surface.

[0042] The beneficial effects of the rapid repair materials and construction methods for emergency repair and reconstruction provided by this invention are analyzed as follows:

[0043] The repair material provided in this solution is a composite material of organic adhesive and inorganic cementitious material. To achieve the corresponding function, it is necessary to ensure that the organic adhesive and inorganic cementitious material are in a ring shape with the inorganic cementitious material in the center and the organic adhesive surrounding the inorganic cementitious material. Therefore, when using this composite material, a specific partitioned injection mechanism is required.

[0044] The zoned injection mechanism includes: an intermediate injection cylinder and an outer injection cylinder arranged concentrically with the intermediate injection cylinder; the intermediate injection cylinder is used to inject inorganic cementitious materials; the outer injection cylinder is used to inject organic adhesives.

[0045] To ensure that the organic adhesive can encapsulate the inorganic cementitious material, in the grouting process, the organic adhesive is first extruded before the inorganic cementitious material. Under the action of the guide plate at the outlet of the outer injection cylinder of the extrusion device, the organic adhesive flows towards the inorganic cementitious material to encapsulate it.

[0046] The purpose of encapsulating inorganic cementitious materials with organic adhesives is to first ensure that the organic adhesive has good adhesion to the wall surface of the crack to be repaired. The inorganic cementitious material is encapsulated by the organic adhesive and can slowly hydrate inside without affecting the initial bonding performance of the overall composite material. As the degree of hydration of the inorganic cementitious material increases, the continuous strength of the repair material continues to increase.

[0047] To increase the bonding tightness between inorganic cementitious materials and organic adhesives, a spherical injection head is installed at the outlet of the inner injection barrel of the extrusion device. The inorganic cementitious material enters the interior of the organic adhesive in the form of a jet, forming a fibrous structure. The fibers increase the pinning effect, avoiding the problem of interfacial slippage between the cementitious material and the organic adhesive, thus improving the overall bonding performance.

[0048] To improve the durability of polyurethane adhesives, the polyurethane surface is modified. The modified polyurethane adhesive is formed by modifying polyurethane with a silane coupling agent. The silane coupling agent is at least one of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and γ-aminopropyltrimethoxysilane. Polyurethane itself has good alkali resistance; the modified polyurethane adhesive further improves its alkali resistance, thereby enhancing its compatibility with inorganic cementitious materials.

[0049] Experiments have shown that when the volume ratio of organic adhesive to inorganic cementitious material is 3:1, both organic adhesive and inorganic cementitious material achieve greater tensile strength. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 A schematic diagram of the overall structure of the partitioned injection mechanism provided in the embodiments of the present invention.

[0052] Icons: 100 - Zoned injection mechanism; 110 - Intermediate injection cylinder; 111 - Injection head; 120 - Outer injection cylinder; 121 - Guide plate. Detailed Implementation

[0053] Test method: The test shall be conducted in accordance with the method specified in the national standard GB17671.

[0054] Example 1

[0055] The cementitious materials are proportioned as follows by weight:

[0056] 12 parts of ordinary Portland cement;

[0057] 9 parts fly ash;

[0058] 2 parts of microsilica powder;

[0059] 9 parts water;

[0060] 28 portions of sand;

[0061] 25 portions of crushed stone;

[0062] Early-strength agent 1.5 parts;

[0063] 0.2 parts of polycarboxylate superplasticizer.

[0064] The organic adhesive is a modified polyurethane adhesive, which is formed by modifying 3-aminopropyltrimethoxysilane.

[0065] The volume ratio of organic adhesive to inorganic cementitious material is 3:1.

[0066] Using a zoned injection mechanism B (such as Figure 1 As shown, grouting is performed. The partitioned injection mechanism B includes an intermediate injection cylinder and an outer injection cylinder concentrically arranged with the intermediate injection cylinder. The intermediate injection cylinder has a spherical injection head.

[0067] Organic adhesive is filled into the outer injection cylinder, and inorganic cementing material is filled into the middle injection cylinder; the outer injection cylinder is driven for 3 seconds, and then the middle injection cylinder is driven. Finally, the repair device is moved laterally so that the guide plate of the outer injection cylinder smooths the crack surface.

[0068] The experimentally measured tensile strength was 20.1 MPa.

[0069] Comparative Example 1

[0070] The formulations of the cementitious materials and organic adhesives are the same as in Example 1;

[0071] The volume ratio of organic adhesive to inorganic cementitious material is 3:1.

[0072] Grouting is performed using mold A, which includes an intermediate injection cylinder and an outer injection cylinder concentrically arranged with the intermediate injection cylinder, but the intermediate injection cylinder does not have a spherical injection head;

[0073] Organic adhesive is filled into the outer injection cylinder, and inorganic cementing material is filled into the middle injection cylinder; the outer injection cylinder is driven for 3 seconds, and then the middle injection cylinder is driven. Finally, the repair device is moved laterally so that the guide plate of the outer injection cylinder smooths the crack surface.

[0074] The experimentally measured tensile strength was 15.9 MPa.

[0075] Comparative Example 2

[0076] The formulations of the inorganic cementitious material and the organic adhesive are the same as in Example 1;

[0077] The volume ratio of organic adhesive to inorganic cementitious material is 1:1.

[0078] Grouting is performed using a partitioned injection mechanism B, which includes an intermediate injection cylinder and an outer injection cylinder concentrically arranged with the intermediate injection cylinder. The intermediate injection cylinder has a spherical injection head.

[0079] Organic adhesive is filled into the outer injection cylinder, and inorganic cementing material is filled into the middle injection cylinder; the outer injection cylinder is driven for 3 seconds, and then the middle injection cylinder is driven. Finally, the repair device is moved laterally so that the guide plate of the outer injection cylinder smooths the crack surface.

[0080] The tensile strength was measured to be 12.2 MPa.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid repair material for emergency repairs and reconstruction, characterized in that, include: Inorganic cementitious material and organic adhesive are extruded into the gap to be repaired in sections by annular extrusion, with the organic adhesive located outside the inorganic cementitious material. The inorganic cementitious material is composed of the following parts by weight: 10-15 parts of ordinary Portland cement; 9-10 parts fly ash; 1.2-3 parts of microsilica powder; 8-10 parts water; 24-30 parts sand; 20-30 parts crushed stone; Early-strength agent 0.5-2 parts; 0.1-0.3 parts of polycarboxylate superplasticizer.

2. The rapid repair material for emergency repair and reconstruction according to claim 1, characterized in that, include: The organic adhesive is one or more of the following: fast-curing resin materials, epoxy resin, polyurethane, and polyurea.

3. The rapid repair material for emergency repair and reconstruction according to claim 2, characterized in that, include: Polyurethane is modified with a silane coupling agent.

4. The rapid repair material for emergency repair and reconstruction according to claim 3, characterized in that, include: The silane coupling agent is at least one of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and γ-aminopropyltrimethoxysilane.

5. The rapid repair material for emergency repair and reconstruction according to claim 1, characterized in that, include: The volume ratio of organic adhesive to inorganic cementitious material is (2-5):

1.

6. A construction method using the rapid repair material for emergency repair and reconstruction as described in any one of claims 1-5, characterized in that... : The injection is performed using a zoned injection mechanism, which has an annular injection head. The inorganic cementitious material and organic adhesive are extruded into the gap to be repaired in a ring-shaped manner through a zoned injection mechanism, with the organic adhesive located outside the inorganic cementitious material.

7. The construction method for the rapid repair material for emergency repair and reconstruction according to claim 6, characterized in that... : The partitioned injection mechanism includes: a central injection cylinder and an outer injection cylinder arranged concentrically with the central injection cylinder; The intermediate injection cylinder is used to inject inorganic cementitious materials; The outer injection cylinder is used to inject organic adhesives.

8. The construction method for the rapid repair material for emergency repair and reconstruction according to claim 7, characterized in that... : The outer injection cylinder outlet edge is provided with an inwardly inclined guide plate.

9. The construction method for the rapid repair material for emergency repair and reconstruction according to claim 8, characterized in that... : The lower part of the intermediate injection cylinder is provided with a spherical injection head, and the spherical injection head has a small hole.

10. The construction method for the rapid repair material for emergency repair and reconstruction according to claim 9, characterized in that, Includes the following steps: Inject the inorganic cementitious material into the intermediate injection cylinder; Inject the organic adhesive into the outer injection cylinder; First, drive the outer injection cylinder continuously, then drive the inner injection cylinder continuously, and finally move the repair device laterally so that the guide plate of the outer injection cylinder can scrape the crack surface.

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