Insulation anchoring type high-strength grouting material and preparation method thereof

Abstract

The invention relates to the technical field of grouting material preparation, and discloses an insulating anchoring type high-strength grouting material and a preparation method thereof. The grouting material consists of the following components in parts by weight: 300-500 parts of Portland cement, 100-300 parts of slag powder, 50-150 parts of silica fume, 5-20 parts of a water reducing agent, 20-50 parts of an expanding agent, 100-200 parts of insulating filler, 20-50 parts of an anchoring enhancer, 1-5 parts of an air entraining agent, 0-5 parts of a retarder and 200-400 parts of water, wherein the expanding agent is one of an ettringite type expanding agent, a calcium oxide type expanding agent or a composite expanding agent. After being cured, the grouting material can form a structural body with high strength and good anchoring performance, so that a grouting layer can keep stability and safety when bearing large load or shearing force, and the structure is effectively prevented from being loosened or damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting material preparation, and specifically relates to an insulating anchoring type high-strength grouting material and a preparation method thereof. Background Art

[0002] In the field of construction engineering and equipment installation, grouting materials, as an important building material, are widely used in scenarios such as structural reinforcement, equipment foundation grouting, and anchor fixing. With the development of modern engineering technology, the performance requirements for grouting materials are becoming higher and higher. They not only need to have high strength, high fluidity and good construction performance, but also need to have specific functional characteristics, such as insulation and anchoring properties.

[0003] Although traditional grouting materials can meet the basic strength and fluidity requirements to a certain extent, they often have deficiencies in insulation and anchoring properties. Especially in the foundation grouting of electrical equipment and in situations where current leakage needs to be prevented, the insulation performance of the grouting material is particularly important. At the same time, in situations where large tensile and shear forces need to be withstood, the anchoring performance of the grouting material is also a key factor in ensuring structural safety. Therefore, an insulating and anchoring high-strength grouting material is developed. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an insulating anchoring high-strength grouting material and a preparation method, which aims to solve the technical problems of poor insulation and anchoring performance of the grouting material in the prior art to a certain extent.

[0005] The technical solution of the present invention is: an insulating anchoring high-strength grouting material, which is composed of the following components by weight:

[0006] 300-500 parts of Portland cement, 100-300 parts of slag powder, 50-150 parts of silica fume, 5-20 parts of water reducer, 20-50 parts of expansion agent, 100-200 parts of insulating filler, 20-50 parts of anchoring enhancer, 1-5 parts of air entraining agent, 0-5 parts of retarder, and 200-400 parts of water.

[0007] Furthermore, the expansion agent is one of an ettringite expansion agent, a calcium oxide expansion agent or a composite expansion agent.

[0008] Furthermore, the insulating filler is one of mica powder, ceramic microbeads or glass fiber.

[0009] Furthermore, the anchoring reinforcing agent is one of chopped carbon fiber, steel fiber or polymer fiber.

[0010] Furthermore, the grade of the slag powder is S105, and the specific surface area is 450-500m 2 / kg, the 7-day activity index is greater than 80%, and the 28-day activity index is greater than 98%.

[0011] Furthermore, the water reducing agent has a water reducing rate greater than 32% and a density of 1060-1100 kg / m 3 .

[0012] Furthermore, the air entraining agent is one of a fatty acid salt air entraining agent, a rosin soap air entraining agent or an alkyl sulfonate air entraining agent.

[0013] A method for preparing an insulating anchoring high-strength grouting material comprises the following steps:

[0014] a) uniformly mixing 300-500 parts of Portland cement, 100-300 parts of slag powder, 50-150 parts of silica fume, 100-200 parts of insulating filler and 20-50 parts of anchoring enhancer to form a dry mix;

[0015] b) Add 5-20 parts of water reducer and 1-5 parts of air entraining agent to the dry mix while continuously stirring, and gradually add 200-400 parts of water;

[0016] c) Continue stirring until uniform, then add 20-50 parts of expansion agent and 0-5 parts of retarder, and stir again until completely dissolved and dispersed to form a uniform grouting material;

[0017] d) Inject the prepared grouting material into the area to be grouted, and remove bubbles by natural or forced means to ensure that the grouting is dense.

[0018] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0019] 1. Through the setting of cementitious materials such as silicate cement, slag powder, silica fume, and anchoring enhancers, this grouting material can form a high-strength structure with good anchoring performance after solidification, which enables the grouting layer to maintain stability and safety when subjected to large loads or shear forces, and effectively prevents the structure from loosening or damage.

[0020] 2. Insulating fillers are added to the grouting material, which forms a continuous insulating layer in the grouting material, effectively improving the insulation performance of the grouting material. This makes the grouting material have a wide range of application prospects in occasions such as foundation grouting of electrical equipment where current leakage needs to be prevented, and can ensure the safe operation of the equipment.

[0021] 3. By adding water reducing agent and air entraining agent, the grouting material has good fluidity and self-compacting properties during the preparation process, which enables the grouting material to be easily injected into the grouting holes of complex structures and remove bubbles in a natural or forced manner to ensure the density and uniformity of the grouting layer.

[0022] 4. By adding retarders, the initial setting time of the grouting material can be adjusted according to the needs of the project, which helps construction personnel to better control the grouting process and ensure that the grouting layer reaches the required strength and performance requirements within the specified time.

[0023] 5. The raw materials used in this grouting material are mostly industrial waste or renewable resources, which helps to reduce resource waste and environmental pollution. At the same time, the preparation process of the grouting material is simple and easy to control, and no harmful substances are produced, which meets the environmental protection and sustainability requirements of modern building materials. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] An insulating anchoring high-strength grouting material, the grouting material is composed of the following components in parts by weight:

[0026] 300-500 parts of Portland cement, 100-300 parts of slag powder, 50-150 parts of silica fume, 5-20 parts of water reducer, 20-50 parts of expansion agent, 100-200 parts of insulating filler, 20-50 parts of anchoring enhancer, 1-5 parts of air entraining agent, 0-5 parts of retarder, and 200-400 parts of water.

[0027] As the main cementing material of the grouting material, the silicate cement used in the present invention is graded 425 or 525. The silicate cement grade 425 is suitable for general concrete structures and reinforced concrete structures, such as bridges and houses, and has a moderate compressive strength grade, which can meet the needs of most conventional construction projects. The silicate cement grade 525 is suitable for high-strength and high-durability construction projects, such as highways and large-scale water conservancy projects. This type of cement has a high compressive strength grade and can meet the construction needs with strict requirements on strength and durability.

[0028] As an auxiliary cementitious material, slag powder can improve the microstructure of grouting materials and increase strength and durability. The grade of slag powder is S105, with a specific surface area of ​​450-500m 2 / kg, which ensures that the slag powder has high activity and can undergo a good hydration reaction with silicate cement to generate more hydration products, thereby improving the strength and density of the grouting material. In addition, the 7d activity index of the slag powder is greater than 80%, and the 28d activity index is greater than 98%, which further proves that the slag powder has good activity performance.

[0029] As an active admixture, silica fume can improve the strength and density of grouting materials. Silica fume has fine particles and a large specific surface area, which can fill the gaps between cement particles and improve the density of grouting materials. At the same time, the active silicon dioxide in silica fume can react with calcium hydroxide in cement to generate more hydrated calcium silicate, thereby improving the strength of grouting materials. In addition, silica fume can also improve the impermeability and durability of grouting materials.

[0030] The water reducing agent can reduce the water-cement ratio of the grouting material and improve fluidity and strength. The water reducing agent in the present invention has a water reducing rate greater than 32% and a density of 1060-1100 kg / m 3 In the meantime, the water-reducing agent can significantly reduce the water-cement ratio of the grouting material, improve fluidity and workability, and at the same time ensure that the grouting material has higher strength and durability after hardening.

[0031] The expansion agent can produce a micro-expansion effect, compensate for the shrinkage of the grouting material during the hardening process, and improve the crack resistance. In the present invention, the expansion agent is selected from one of the ettringite expansion agent, the calcium oxide expansion agent, or the composite expansion agent. The ettringite expansion agent produces an expansion effect by generating ettringite crystals; the calcium oxide expansion agent produces an expansion effect by generating calcium hydroxide through the reaction of calcium oxide and water; the composite expansion agent combines the advantages of the above two expansion agents and has better expansion performance and crack resistance.

[0032] Insulating fillers can significantly improve the insulation performance of grouting materials. In the present invention, the insulating filler is selected from one of mica powder, ceramic microbeads or glass fiber. Mica powder has good insulation performance and high temperature resistance; ceramic microbeads have the advantages of light weight, high strength and insulation; glass fiber has high strength and good insulation performance. These insulating fillers can fill the gaps in the grouting material to form a continuous insulating layer, thereby improving the insulation performance of the grouting material.

[0033] Anchoring enhancers can significantly improve the anchoring performance of grouting materials. In the present invention, the anchoring enhancer is selected from one of chopped carbon fibers, steel fibers or polymer fibers. Chopped carbon fibers have high strength and modulus, which can significantly improve the tensile strength and shear strength of grouting materials; steel fibers have high strength and toughness, which can increase the crack resistance and durability of grouting materials; polymer fibers can improve the impermeability and durability of grouting materials. These anchoring enhancers can increase the bonding force between the grouting material and the substrate and improve the anchoring performance. .

[0034] The air entraining agent can introduce tiny bubbles to improve the workability and antifreeze performance of the grouting material. In the present invention, the air entraining agent is selected from one of the fatty acid salt air entraining agent, rosin soap air entraining agent or alkyl sulfonate air entraining agent. These air entraining agents can introduce tiny bubbles during the stirring process, making the grouting material more uniform and easy to construct. At the same time, the tiny bubbles can also improve the antifreeze performance of the grouting material and reduce the damage caused by freeze-thaw cycles.

[0035] The retarder can adjust the initial setting time of the grouting material, which is convenient for construction and pouring. In the present invention, the amount of the retarder used ranges from 0 to 5 parts. The retarder should be selected according to the specific project needs and the performance requirements of the grouting material. In the case where the initial setting time needs to be extended, a retarder can be added in an appropriate amount; and in the case where rapid hardening is required, the retarder can be reduced or not added.

[0036] Embodiment 1:

[0037] A method for preparing an insulating anchoring high-strength grouting material comprises the following steps:

[0038] a) 300 parts of Portland cement, 100 parts of slag powder, 50 parts of silica fume, 100 parts of insulating filler and 20 parts of anchoring enhancer are mixed uniformly to form a dry mix;

[0039] b) Add 5 parts of water reducer and 1 part of air entraining agent to the dry mix while gradually adding 200 parts of water under continuous stirring;

[0040] c) Continue stirring until uniform, then add 20 parts of expansion agent and 0 parts of retarder, and stir again until completely dissolved and dispersed to form a uniform grouting material;

[0041] d) Inject the prepared grouting material into the area to be grouted, and remove bubbles by natural or forced means to ensure that the grouting is dense.

[0042] Embodiment 2:

[0043] A method for preparing an insulating anchoring high-strength grouting material comprises the following steps:

[0044] a) 400 parts of Portland cement, 200 parts of slag powder, 100 parts of silica fume, 150 parts of insulating filler and 35 parts of anchoring enhancer are mixed uniformly to form a dry mix;

[0045] b) Add 10 parts of water reducer and 3 parts of air entraining agent to the dry mix while gradually adding 300 parts of water under continuous stirring;

[0046] c) Continue stirring until uniform, then add 35 parts of expansion agent and 3 parts of retarder, and stir again until completely dissolved and dispersed to form a uniform grouting material;

[0047] d) Inject the prepared grouting material into the area to be grouted, and remove bubbles by natural or forced means to ensure that the grouting is dense.

[0048] Embodiment three:

[0049] A method for preparing an insulating anchoring high-strength grouting material comprises the following steps:

[0050] a) 500 parts of Portland cement, 300 parts of slag powder, 150 parts of silica fume, 200 parts of insulating filler and 50 parts of anchoring enhancer are mixed uniformly to form a dry mix;

[0051] b) Add 20 parts of water reducer and 5 parts of air entraining agent to the dry mix while gradually adding 400 parts of water under continuous stirring;

[0052] c) Continue stirring until uniform, then add 50 parts of expansion agent and 5 parts of retarder, and stir again until completely dissolved and dispersed to form a uniform grouting material;

[0053] d) Inject the prepared grouting material into the area to be grouted, and remove bubbles by natural or forced means to ensure that the grouting is dense.

[0054] According to relevant standards (such as GB / T 50081-2019 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete"), standard-sized cubic test blocks are prepared, one test block is prepared for each embodiment, and the test blocks are cured under standard conditions to a specified age (such as 28 days).

[0055] Compressive strength test:

[0056] The test blocks prepared in Example 1, the test blocks prepared in Example 2, and the test blocks prepared in Example 3 were respectively placed on the pressure plate of the universal material testing machine, the position of the pressure plate was adjusted so that it was in uniform contact with the test blocks, and then pressure was applied at a constant loading rate until the test blocks were destroyed, and the maximum pressure value at the time of destruction was recorded.

[0057] Calculation formula: compressive strength (MPa) = maximum pressure value (N) / compressive area of ​​test block (mm 2 ).

[0058] Insulation performance test:

[0059] Take out the test block prepared in Example 1, the test block prepared in Example 2 and the test block prepared in Example 3, wipe off the surface moisture respectively, contact the test electrode with the surface of each test block to ensure that there are no bubbles and gaps, start the high resistance meter or insulation resistance tester, and record the insulation resistance value within the specified time.

[0060] Calculation formula: Resistivity (Ω·m) = insulation resistance value (Ω) / test block thickness (m) × test block area (m 2 ).

[0061] Anchoring performance test:

[0062] The test block prepared in Example 1, the test block prepared in Example 2 and the test block prepared in Example 3 are placed on a tensile testing machine or a shear testing machine respectively, and tensile force or shear force is applied at a prescribed loading rate until the test piece is destroyed, and the maximum tensile force or shear force value at the time of destruction is recorded.

[0063] Data calculation: tensile strength (MPa) = maximum tensile force (N) / cross-sectional area of ​​anchor bolt or anchor member (mm 2 );

[0064] Shear strength (MPa) = maximum shear force (N) / shear surface area (mm 2 ).

[0065] Mobility and workability tests:

[0066] The grouting materials prepared in Example 1, the grouting materials prepared in Example 2, and the grouting materials prepared in Example 3 were poured into the slump cone respectively, and then the cone was quickly lifted to observe the slump height and expansion diameter of the grouting materials prepared in each example, and the slump height (mm) and expansion diameter (mm) were directly recorded as evaluation indicators of fluidity and workability.

[0067] Performance inspection test results:

[0068]

[0069]

[0070] The insulating anchoring high-strength grouting material of the present invention exhibits excellent performance in terms of compressive strength, insulation performance, anchoring performance, fluidity and workability. The improvement of these performances is mainly due to the reasonable selection and proportioning of raw materials, the optimization of the preparation process and the synergistic effect of each component. Therefore, the grouting material of the present invention is particularly suitable for occasions requiring high strength and insulation performance, such as electrical equipment foundation grouting, structural reinforcement, anchor bolt fixing, etc. Performance testing and result analysis further prove that the grouting material of the present invention has broad application prospects and market value.

[0071] The insulating anchoring high-strength grouting material of the present invention is provided with cementitious materials such as silicate cement, slag powder, silica fume, and an anchoring enhancer. After solidification, the grouting material can form a high-strength structure with good anchoring performance. This enables the grouting layer to maintain stability and safety when subjected to large loads or shear forces, and effectively prevents the structure from loosening or being damaged.

[0072] Insulating fillers are added to the grouting material, and the insulating fillers form a continuous insulating layer in the grouting material, which effectively improves the insulation performance of the grouting material. This makes the grouting material have broad application prospects in occasions such as foundation grouting of electrical equipment where current leakage needs to be prevented, and can ensure the safe operation of the equipment.

[0073] By adding water reducing agent and air entraining agent, the grouting material has good fluidity and self-compacting properties during the preparation process, which enables the grouting material to be easily injected into the grouting holes of complex structures and remove bubbles in a natural or forced manner to ensure the density and uniformity of the grouting layer.

[0074] By adding retarders, the initial setting time of the grouting material can be adjusted according to the needs of the project, which helps construction personnel to better control the grouting process and ensure that the grouting layer reaches the required strength and performance requirements within the specified time.

[0075] The raw materials used in grouting materials are mostly industrial waste or renewable resources, which helps to reduce resource waste and environmental pollution. At the same time, the preparation process of grouting materials is simple and easy to control, and does not produce harmful substances, which meets the environmental protection and sustainability requirements of modern building materials.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An insulating anchoring high-strength grouting material, characterized in that: The grouting material is composed of the following components by weight: 300-500 parts of Portland cement, 100-300 parts of slag powder, 50-150 parts of silica fume, 5-20 parts of water reducer, 20-50 parts of expansion agent, 100-200 parts of insulating filler, 20-50 parts of anchoring enhancer, 1-5 parts of air entraining agent, 0-5 parts of retarder, and 200-400 parts of water.

2. The insulating anchoring high-strength grouting material according to claim 1, characterized in that: The expansion agent is one of an ettringite expansion agent, a calcium oxide expansion agent or a composite expansion agent.

3. The insulating anchoring high-strength grouting material according to claim 1, characterized in that: The insulating filler is one of mica powder, ceramic microbeads or glass fiber.

4. The insulating anchoring high-strength grouting material according to claim 1, characterized in that: The anchoring reinforcing agent is one of chopped carbon fiber, steel fiber or polymer fiber.

5. The insulating anchoring high-strength grouting material according to claim 1, characterized in that: The grade of the slag powder is S105, and the specific surface area is 450-500m 2 / kg, the 7-day activity index is greater than 80%, and the 28-day activity index is greater than 98%.

6. The insulating anchoring high-strength grouting material according to claim 1, characterized in that: The water reducing agent has a water reducing rate greater than 32% and a density of 1060-1100 kg / m 3 .

7. The insulating anchor type high-strength grouting according to claim 1, characterized in that: The air entraining agent is one of a fatty acid salt air entraining agent, a rosin soap air entraining agent or an alkyl sulfonate air entraining agent.

8. A method for preparing the insulating anchoring high-strength grouting material according to any one of claims 1 to 7, comprising the following steps: a) uniformly mixing 300-500 parts of Portland cement, 100-300 parts of slag powder, 50-150 parts of silica fume, 100-200 parts of insulating filler and 20-50 parts of anchoring enhancer to form a dry mix; b) Add 5-20 parts of water reducer and 1-5 parts of air entraining agent to the dry mix under continuous stirring, and gradually add 200-400 parts of water; c) Continue stirring until uniform, then add 20-50 parts of expansion agent and 0-5 parts of retarder, and stir again until completely dissolved and dispersed to form a uniform grouting material; d) Inject the prepared grouting material into the area to be grouted, and remove bubbles by natural or forced means to ensure that the grouting is dense.

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