Easily-detachable temperature-sensitive grouting material for grouting sleeve and preparation method of easily-detachable temperature-sensitive grouting material

Abstract

The invention relates to a detachable temperature-sensitive grouting material for a grouting sleeve and a preparation method of the detachable temperature-sensitive grouting material, and belongs to the technical field of building materials. The grouting material has the strength equivalent to that of a conventional grouting material in the market at normal temperature, and the normal use requirement of a grouting sleeve is met; after the temperature rises, the strength of the grouting sleeve is obviously reduced, and meanwhile, the steel bar drawing force of the grouting sleeve is obviously reduced, so that the grouting sleeve is conveniently disassembled. The grouting material provided by the invention is prepared from the following components in parts by weight: 100 parts of cement, 10-20 parts of sand, 90-110 parts of acrylic microspheres, 5-10 parts of silica fume, 0.5-1.5 parts of a water reducing agent, 4-7 parts of an expanding agent, 0.15-0.35 part of a defoaming agent and 28-38 parts of water. By optimizing the formula of the grouting material, the strength of the grouting material at high temperature is remarkably reduced, so that the grouting sleeve is quickly disassembled. An efficient and environment-friendly solution is provided for solving the grouting sleeve dismounting problem and the prefabricated part recycling problem, and remarkable economic and social benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to an easily detachable temperature-sensitive grouting material for a grouting sleeve and a preparation method thereof. Background Art

[0002] Grouting sleeve connection technology is a key link in prefabricated buildings. Grouting materials are used to firmly connect the steel bars and sleeves to ensure the integrity and bearing capacity of the structure. At present, the grouting materials on the market are mainly designed with high strength and high fluidity as the design goals to meet the connection performance requirements of the grouting sleeve. However, the existing grouting material technology has the following problems in practical applications: difficulty in disassembly, waste of resources, and low construction efficiency.

[0003] When the density test of the grouting sleeve fails or the prefabricated structure needs to be dismantled, the existing grouting material is extremely difficult to dismantle due to its high strength and strong adhesion. Usually, mechanical crushing or cutting is required, which is not only time-consuming and labor-intensive, but may also damage the grouting sleeve and prefabricated components, making secondary use impossible. The high strength characteristics of the existing grouting material make the dismantling process of prefabricated components complicated and irreversible, resulting in the generation of a large amount of construction waste, which does not meet the requirements of green buildings and sustainable development.

[0004] The performance of existing grouting materials does not change much under normal and high temperature environments, and it is impossible to achieve strength changes through simple temperature control, which limits its application in special scenarios (such as disassembly and recycling). During the dismantling of prefabricated structures, the high strength characteristics of existing grouting materials lead to low dismantling efficiency, increasing construction costs and time costs. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention aims to provide an easily detachable temperature-sensitive grouting material for a grouting sleeve and a preparation method thereof.

[0006] The present invention provides a temperature-sensitive grouting material, which adopts the following technical solution: A thermally reversible repair mortar comprises the following components in parts by weight: 100 parts of cement, 10-20 parts of sand, 90-110 parts of acrylic microspheres, 5-10 parts of silica fume, 0.5-1.5 parts of a water reducing agent, 4-7 parts of an expansion agent, 0.15-0.35 parts of a defoaming agent, and 28-38 parts of water.

[0007] Preferably, in the above-mentioned temperature-sensitive grouting material, the particle size range of the acrylic microbeads is 0.1 mm-1 mm.

[0008] Preferably, in the above-mentioned temperature-sensitive grouting material, the sand is fine sand with a particle size ranging from 0.15 mm to 0.6 mm.

[0009] Preferably, in the above-mentioned temperature-sensitive grouting material, the water reducer is a polycarboxylic acid-based high-efficiency water reducer.

[0010] Preferably, in the above-mentioned temperature-sensitive grouting material, the expansion agent is a calcium oxide or calcium sulfoaluminate expansion agent.

[0011] Preferably, in the above-mentioned temperature-sensitive grouting material, the defoaming agent is a silicone defoaming agent.

[0012] Preferably, in the preparation method of the above-mentioned easily detachable temperature-sensitive grouting material, the operation steps include: 1) Mix cement, sand, acrylic particles, silica fume and expansion agent in proportion to form a dry mix; 2) Add water and water reducing agent to the dry mix and stir until uniform; 3) Add defoaming agent and continue stirring until the slurry is uniform and free of bubbles to obtain an easily disassembled temperature-sensitive grouting material.

[0013] It can be seen from the technical solutions disclosed above that, compared with the prior art, the beneficial effects of the present invention are as follows: In summary, the present invention provides an easily detachable temperature-sensitive grouting material for a grouting sleeve and a preparation method thereof.

[0014] The present invention optimizes the formula of the grouting material and imparts it with temperature-sensitive characteristics, thereby ensuring the compressive strength of the temperature-sensitive grouting material and the steel bar pull-out strength at room temperature, and can achieve that after the temperature rises, the compressive strength of the grouting material is reduced to within one third of the strength at room temperature, and the steel bar pull-out strength is reduced to within one eighth of the strength at room temperature, thereby solving the problems of difficult disassembly of existing grouting materials, waste of resources, and low construction efficiency, and providing an efficient and environmentally friendly solution for the high-quality connection and removal of grouting sleeves. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with specific embodiments. The technical content and features of the present invention will be described in detail below by the enumerated embodiments.

[0016] The easily removable temperature-sensitive grouting material for a grouting sleeve of the present embodiment 1 mainly comprises the following components in parts by weight: 100 parts of cement, 10 parts of sand, 110 parts of acrylic microspheres, 10 parts of silica fume, 1 part of water reducer, 6 parts of expansion agent, 0.2 parts of defoamer, and 32 parts of water.

[0017] The preparation method of the easily detachable temperature-sensitive grouting material of this embodiment has the following specific steps: 1) Mix 100 parts of cement, 10 parts of sand, 110 parts of acrylic microspheres, 10 parts of silica fume and 6 parts of expansion agent in proportion to form a dry mix; 2) Add 32 parts of water and 1 part of water reducing agent to the dry mix and stir until uniform; 3) Add 0.2 parts of defoamer and continue stirring until the slurry is uniform and free of bubbles to obtain an easily removable temperature-sensitive grouting material; Add the prepared temperature-sensitive grouting material into the sleeve with the steel bars inserted, and ensure that the grouting sleeve is cured after the density test fails.

[0018] After testing, the strength of the temperature-sensitive grouting material of this embodiment is 92.3 MPa at room temperature, and the strength when heated to about 200°C is 29.8 MPa. The strength changes nonlinearly with increasing temperature. The maximum steel bar pull-out force at room temperature is 91 kN, and the maximum steel bar pull-out force at 200°C is 10.5 kN. The sleeve is almost intact and can be reused.

[0019] The prepared temperature-sensitive grouting material of this embodiment can be used for disassembly of the grouting sleeve when the density test fails. The disassembly process is achieved by increasing the temperature to reduce the strength of the grouting material, and the disassembled grouting sleeve can be used a second time.

[0020] The easily removable temperature-sensitive grouting material for a grouting sleeve of the second embodiment mainly comprises the following components in parts by weight: 100 parts of cement, 15 parts of sand, 100 parts of acrylic microspheres, 5 parts of silica fume, 0.8 parts of water reducer, 5.5 parts of expansion agent, 0.18 parts of defoaming agent, and 29 parts of water.

[0021] The preparation method of the easily detachable temperature-sensitive grouting material of this embodiment has the following specific steps: 1) Mix 100 parts of cement, 15 parts of sand, 100 parts of acrylic microspheres, 5 parts of silica fume and 5.5 parts of expansion agent in proportion to form a dry mix; 2) Add 29 parts of water and 0.8 parts of water reducing agent to the dry mix and stir until uniform; 3) Add 0.18 parts of defoamer and continue stirring until the slurry is uniform and free of bubbles to obtain an easily removable temperature-sensitive grouting material; Add the prepared temperature-sensitive grouting material into the sleeve with the steel bars inserted, and perform maintenance after the density test of the grouting sleeve is qualified; After testing, the strength of the temperature-sensitive grouting material of this embodiment is 87.3 MPa at room temperature, and the strength when heated to about 200°C is 25.2 MPa. The strength changes nonlinearly with increasing temperature. The maximum steel bar pull-out force at room temperature is 86.2 kN, and the maximum steel bar pull-out force at 200°C is 9 kN. The sleeve is almost intact and can be reused.

[0022] The prepared temperature-sensitive grouting material of this embodiment can be used for dismantling prefabricated assembled structures. The strength of the grouting material can be reduced by increasing the temperature, thereby achieving rapid recovery of prefabricated components.

[0023] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An easily removable temperature-sensitive grouting material for a grouting sleeve, characterized in that: The invention is prepared from the following components in parts by weight: 100 parts of cement, 10-20 parts of sand, 90-110 parts of acrylic microspheres, 5-10 parts of silica fume, 0.5-1.5 parts of water reducing agent, 4-7 parts of expansion agent, 0.15-0.35 parts of defoaming agent and 28-38 parts of water.

2. The temperature-sensitive grouting material according to claim 1, characterized in that: The particle size of the acrylic microbeads ranges from 0.1 mm to 1 mm.

3. The temperature-sensitive grouting material according to claim 1, characterized in that: The sand is fine sand with a particle size ranging from 0.15mm to 0.6mm.

4. The temperature-sensitive grouting material according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid-based high-efficiency water reducing agent.

5. The temperature-sensitive grouting material according to claim 1, characterized in that: The expansion agent is a calcium oxide or calcium sulphoaluminate expansion agent.

6. The temperature-sensitive grouting material according to claim 1, characterized in that: The defoaming agent is a silicone defoaming agent.

7. The method for preparing the easily detachable temperature-sensitive grouting material according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Mix cement, sand, acrylic particles, silica fume and expansion agent in proportion to form a dry mix; 2) Add water and water reducing agent to the dry mix and stir until uniform; 3) Add defoaming agent and continue stirring until the slurry is uniform and free of bubbles to obtain an easily disassembled temperature-sensitive grouting material.