Novel quick-setting repair mortar

Abstract

The invention discloses novel quick-setting repair mortar which comprises the following components in parts by weight: 40-60 parts of gypsum, 20-40 parts of quartz sand, 4-7 parts of carbon fibers, 8-12 parts of 525 # cement, 4-6 parts of slaked lime powder and 4.5-5.5 parts of a composite waterproof adhesive, the components are added into a dry powder stirrer to obtain a powdery finished product, the powdery finished product is mixed with water to obtain the repair mortar, the initial setting time of the mortar is smaller than or equal to 30 min, the final setting time of the mortar is smaller than or equal to 50 min, the compressive strength of the mortar is larger than or equal to 15.0 MPa when the mortar is solidified for 6 h, and the compressive strength of the mortar is larger than or equal to 20.0 MPa when the mortar is solidified for 24 h. The quick-setting repair mortar has the characteristic of quick setting, is high in compressive strength after setting, firm and durable, does not affect the subsequent use of a repair surface, is easy to obtain raw materials, is relatively low in cost, is environment-friendly and non-toxic in used raw materials, is convenient to construct, and saves the repair time.

Description

Technical Field

[0001] The invention belongs to the technical field of repair mortar, and in particular relates to a novel quick-setting repair mortar. Background Art

[0002] Concrete is widely used in roads, floors, roof protection layers, various parking lots and other places. As the use time increases, the concrete surface will be damaged or cracks with stones and sand exposed, resulting in an unsightly surface and road depressions causing driving unsafe problems. However, using ordinary concrete to repair the damaged area alone is prone to further damage. If a large area is to be renovated, the cost is too high. Therefore, a repair mortar that can set quickly is needed to repair the damaged area. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new type of quick-setting repair mortar, which can repair the damage of concrete surface and has the characteristics of high compressive strength, rapid curing and not easy to be damaged again.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: A novel quick-setting repair mortar comprises the following components in parts by weight: 40-60 parts of gypsum, 20-40 parts of quartz sand, 4-7 parts of carbon fiber, 8-12 parts of 525# cement, 4-6 parts of slaked lime powder, and 4.5-5.5 parts of a composite waterproof adhesive. The above components are added into a dry powder mixer to obtain a powdery finished product, and the powdery finished product is mixed with water to obtain a repair mortar, wherein the initial setting time of the mortar is ≤30min, the final setting time of the mortar is ≤50min, the compressive strength of the mortar is ≥15.0MPa when solidified for 6h, and the compressive strength of the mortar is ≥20.0MPa when solidified for 24h.

[0005] The following is a further optimization of the above technical solution by the present invention: The invention comprises the following components in parts by weight: 50 parts of gypsum, 30 parts of quartz sand, 5 parts of carbon fiber, 10 parts of 525# cement, 5 parts of slaked lime powder and 5 parts of composite waterproof adhesive.

[0006] Further optimization: the gypsum is a powder of 300-800 mesh, the quartz sand is a powder of 40-80 mesh, the carbon fiber is a powder of 800-1500 mesh, and the slaked lime powder is a powder of 300-500 mesh.

[0007] Further optimization: The optimal weight ratio of the powdered product to water is 1.0:0.16.

[0008] Further optimization: The mortar prepared with the optimal weight ratio has an initial setting time of 28 minutes, a final setting time of 49 minutes, a compressive strength of 20.1 MPa after 6 hours of solidification, and a compressive strength of 26.6 MPa after 24 hours of solidification.

[0009] Further optimization: the dry powder mixer stirs at a speed of 10 revolutions per minute, and the finished product is obtained after stirring for 1 hour.

[0010] Further optimization: The 525# cement is the 525# cement produced by Shanshui Group.

[0011] Further optimization: the composite waterproof adhesive is a composite of a quick-setting agent and a waterproof adhesive.

[0012] The beneficial effects of the present invention are as follows: the quick-setting repair mortar has the characteristics of fast solidification, high compressive strength after solidification, and is strong and durable, and does not affect the subsequent use of the repaired surface. The raw materials are easily available and the cost is low. The raw materials used are environmentally friendly and non-toxic, and the construction is convenient, saving repair time. DETAILED DESCRIPTION

[0013] The invention discloses a novel quick-setting repair mortar, which comprises the following components in parts by weight: 40-60 parts of gypsum, 20-40 parts of quartz sand, 4-7 parts of carbon fiber, 8-12 parts of 525# cement, 4-6 parts of slaked lime powder and 4.5-5.5 parts of a composite waterproof adhesive. The components are added into a dry powder mixer to obtain a powdery finished product, and the powdery finished product is mixed with water to obtain the repair mortar. The initial setting time of the mortar is ≤30min, the final setting time of the mortar is ≤50min, the compressive strength of the mortar is ≥15.0MPa when it is solidified for 6h, and the compressive strength of the mortar is ≥20.0MPa when it is solidified for 24h.

[0014] The quick-setting repair mortar specifically includes the following components in parts by weight: 50 parts of gypsum, 30 parts of quartz sand, 5 parts of carbon fiber, 10 parts of 525# cement, 5 parts of slaked lime powder, and 5 parts of composite waterproof adhesive.

[0015] The gypsum is a powder of 300-800 mesh, the quartz sand is a powder of 40-80 mesh, the carbon fiber is a powder of 800-1500 mesh, and the slaked lime powder is a powder of 300-500 mesh. The 525# cement is the 525# cement produced by Shanshui Group.

[0016] The optimal weight ratio of the powdery finished product to water is 1.0:0.16.

[0017] The mortar prepared with the optimal weight ratio has an initial setting time of 28 minutes, a final setting time of 49 minutes, a compressive strength of 20.1 MPa after 6 hours of solidification, and a compressive strength of 26.6 MPa after 24 hours of solidification.

[0018] The dry powder mixer is stirred at a speed of 10 revolutions per minute, and the finished product is obtained after stirring for 1 hour.

[0019] The composite waterproof adhesive is a composite of a quick-setting agent and a waterproof adhesive.

[0020] Gypsum: Gypsum is used as a cement retarder in the production of cement. It not only slows down the setting, but also improves the strength, shrinkage and corrosion resistance of cement. Building gypsum is mixed with an appropriate amount of water to form a plastic slurry, but it quickly loses its plasticity, generates strength, and develops into a hard solid. The coagulation and hardening of gypsum is a continuous process of dissolution, hydration, gelation, and crystallization. The chemical reaction formula for the coagulation and hardening of building gypsum is: At room temperature, building gypsum can generally set initially within 3-5 minutes after being mixed with water, and finally set within 30 minutes.

[0021] Quartz sand: a non-metallic mineral, a hard, wear-resistant, chemically stable silicate mineral. Mohs hardness 7, has high fire resistance, Carbon fiber: It is a new type of non-metallic material. It can be used as a structural material to carry loads and as a functional material. It is mainly a special fiber composed of carbon elements. It is resistant to high temperature, friction, electricity, heat and corrosion. However, unlike general carbon materials, its appearance is significantly anisotropic, soft, and can be processed into various fabrics. It shows high strength along the fiber axis. The addition of fiber composite sheets changes the form of concrete destruction from the brittle fracture of plain concrete to ductile fracture. The yield load and damage absorption energy are greatly enhanced compared with the corresponding plain concrete. Due to the crack resistance of the fiber, the fracture toughness of the fiber concrete is improved, and the bending strength is also improved. When the strain reaches the strain limit of plain concrete, due to the improvement of the crack influencing factors, the composite material does not break immediately, and the strain will continue to rise until the matrix cracks, so that the fiber concrete obtains high bending strength and has "plasticity". With the increase of fiber volume content, the crack resistance of the fiber composite sheet is greater, so the bending strength of high-content fiber concrete components is greatly improved.

[0022] 525# cement: high strength; high early strength, reaching certain strength requirements in a short time; good impermeability, effectively preventing water penetration, ensuring the durability of the building; good durability, can maintain stable performance for a long time. 525 means the compressive strength is not less than 52.5Mpa. It has high compressive and tensile resistance.

[0023] Composite waterproof adhesive: It blocks water, effectively solves the problem of water leakage in the later stage of the building, and achieves long-term waterproof effect.

[0024] Example 1: According to weight, 60 parts of gypsum, 26 parts of quartz sand, 4 parts of carbon fiber, 12 parts of 525# cement, 6 parts of slaked lime powder, and 4.5 parts of composite waterproof adhesive were weighed. The weighed raw materials were added into a mixer to obtain dry mortar, which was then mixed with water in a ratio of 1.0:0.16 to form a repair mortar.

[0025] Example 2: According to weight, 55 parts of gypsum, 35 parts of quartz sand, 6 parts of carbon fiber, 11 parts of 525# cement, 4 parts of slaked lime powder, and 5.5 parts of composite waterproof adhesive were weighed. The weighed raw materials were added into a mixer to obtain dry mortar, which was then mixed with water in a ratio of 1.0:0.16 to form a repair mortar.

[0026] Example 3: According to the weight ratio, 50 parts of gypsum, 30 parts of quartz sand, 5 parts of carbon fiber, 10 parts of 525# cement, 5 parts of slaked lime powder, and 5 parts of composite waterproof adhesive were weighed. The weighed raw materials were added into a mixer to obtain dry mortar, which was then mixed with water in a ratio of 1.0:0.16 to form a repair mortar.

[0027] Example 4: According to weight, 45 parts of gypsum, 20 parts of quartz sand, 7 parts of carbon fiber, 9 parts of 525# cement, 4 parts of slaked lime powder, and 5 parts of composite waterproof adhesive were weighed. The weighed raw materials were added into a mixer to obtain dry mortar, which was then mixed with water in a ratio of 1.0:0.16 to form a repair mortar.

[0028] Example 5: According to weight, 40 parts of gypsum, 40 parts of quartz sand, 5 parts of carbon fiber, 8 parts of 525# cement, 6 parts of slaked lime powder, and 5.5 parts of composite waterproof adhesive were weighed. The weighed raw materials were added into a mixer to obtain dry mortar, which was then mixed with water in a ratio of 1.0:0.16 to form a repair mortar.

[0029] The repair mortar in the above embodiment is used according to the following steps: Step 1: Grind the floor, smooth out the raised areas, and clean the floor after grinding; Step 2: Pour the repair mortar on the cleaned ground, spread it flat, and wait for it to dry.

[0030] The performance test data of the above embodiments 1-5 are as follows: Serial number Initial setting time Final setting time 6h compressive strength MPa 24h compressive strength MPa Example 1 25 60 23.2 25.3 Example 2 32 45 18.4 24.3 Example 3 28 49 20.6 27.2 Example 4 27 53 18.9 26.7 Example 5 38 54 20.0 24.4 The powdery finished product in Example 3 was submitted to the Building Materials Industry Dry Mix Mortar Product Quality Supervision and Inspection Test Center of the Building Materials Industry Technical Supervision Research Center for inspection.

[0031] The center number (No.) of the inspection report is: 202104DW003G1. The inspection basis is JC / T2381-2016 "Repair Mortar". The test items include setting time and compressive strength. The specific test results are as follows: Serial number Inspection items Standard requirements (fast-setting repair mortar) Test results Single conclusion 1 Coagulation time / min Initial setting time ≤30 28 qualified Final setting time ≤50 49 qualified 2 Compressive strength MPa 6h intensity ≥15.0 20.1 qualified 12h intensity ≥20.0 26.6 qualified For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the protection scope of the present invention.

Claims

1. A new type of quick-setting repair mortar, characterized in that: The invention comprises the following components in parts by weight: 40-60 parts of gypsum, 20-40 parts of quartz sand, 4-7 parts of carbon fiber, 8-12 parts of 525# cement, 4-6 parts of slaked lime powder and 4.5-5.5 parts of composite waterproof adhesive. The above components are added into a dry powder mixer to obtain a powdery finished product, and the powdery finished product is mixed with water to obtain a repair mortar, wherein the initial setting time of the mortar is ≤30min, the final setting time of the mortar is ≤50min, the compressive strength of the mortar is ≥15.0MPa when solidified for 6h, and the compressive strength of the mortar is ≥20.0MPa when solidified for 24h.

2. A novel quick-setting repair mortar according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 50 parts of gypsum, 30 parts of quartz sand, 5 parts of carbon fiber, 10 parts of 525# cement, 5 parts of slaked lime powder and 5 parts of composite waterproof adhesive.

3. A novel quick-setting repair mortar according to claim 2, characterized in that: The gypsum is a powder of 300-800 meshes, the quartz sand is a powder of 40-80 meshes, the carbon fiber is a powder of 800-1500 meshes, and the slaked lime powder is a powder of 300-500 meshes.

4. The novel quick-setting repair mortar according to claim 3 is characterized in that: The optimal weight ratio of the powdery finished product to water is 1.0:0.

16.

5. A novel quick-setting repair mortar according to claim 4, characterized in that: The mortar prepared with the optimal weight ratio has an initial setting time of 28 minutes, a final setting time of 49 minutes, a compressive strength of 20.1 MPa after 6 hours of solidification, and a compressive strength of 26.6 MPa after 24 hours of solidification.

6. The novel quick-setting repair mortar according to claim 5 is characterized in that: The dry powder mixer is stirred at a speed of 10 revolutions per minute, and the finished product is obtained after stirring for 1 hour.

7. The novel quick-setting repair mortar according to claim 6 is characterized in that: The 525# cement mentioned above is the 525# cement produced by Shanshui Group.

8. The novel quick-setting repair mortar according to claim 7 is characterized in that: The composite waterproof adhesive is a composite of a quick-setting agent and a waterproof adhesive.