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CN-116693254-B - Repair material and preparation method and application thereof

CN116693254BCN 116693254 BCN116693254 BCN 116693254BCN-116693254-B

Abstract

The application relates to the technical field of rail transit equipment repair, and particularly discloses a repair material, a preparation method and application thereof. The application discloses a repairing material, which comprises the following components of cement, H60 type high-strength non-shrinkage grouting material, modified diatomite, acrylic emulsion, defoamer, thickener, water repellent, film forming additive and water, wherein the preparation method of the modified diatomite comprises the steps of taking 0.2-0.8wt% of phosphoric acid aqueous solution as a solvent and ethyl cellulose as a modifier at the temperature of 80-100 ℃ and then modifying the diatomite, and the weight ratio of the ethyl cellulose to the diatomite is (6-8) (1-3). The application also discloses a preparation method of the repair material. The repairing material disclosed by the application is used for repairing the track air duct, so that the appearance quality of the track top air duct can be improved, and the repaired track top air duct has good bonding strength, impermeability, water resistance and aging resistance.

Inventors

  • REN WEIFENG
  • YANG HANBING
  • SONG YUJIAN

Assignees

  • 北京港创瑞博混凝土有限公司

Dates

Publication Date
20260505
Application Date
20230606

Claims (10)

  1. 1. The repairing material is characterized by comprising, by weight, 100-130 parts of cement, 20-30 parts of H60 type high-strength shrinkage-free grouting material, 2-5 parts of modified diatomite, 4-8 parts of acrylic emulsion, 0.01-0.08 part of defoamer, 0.02-0.12 part of thickener, 0.004-0.012 part of water repellent, 0.01-0.05 part of film forming additive and 40-60 parts of water; The preparation method of the modified diatomite comprises the steps of adding diatomite into the diatomite to perform constant-temperature reaction for 3-5h under the condition that the temperature is 80-100 ℃ and the concentration is 0.2-0.8wt% of phosphoric acid aqueous solution as a solvent and ethyl cellulose as a modifier, cooling the reaction solution to room temperature, filtering and drying to obtain the modified diatomite, wherein the weight ratio of the ethyl cellulose to the diatomite is (6-8) in the range of (1-3).
  2. 2. The repair material according to claim 1, wherein the concentration of the phosphoric acid aqueous solution is 0.2 to 0.5wt%.
  3. 3. The repair material according to claim 1, wherein the ethylcellulose has a viscosity of 8-220mpa.s.
  4. 4. A repair material according to claim 3, wherein the ethylcellulose has a viscosity of 40-100mpa.s.
  5. 5. The repair material according to claim 1, wherein the diatomaceous earth has a particle size of 100-325 mesh.
  6. 6. The repair material of claim 1, wherein the acrylic emulsion is selected from any one or more of pure acrylic emulsion, silicone acrylic emulsion, and styrene acrylic emulsion.
  7. 7. The repair material according to claim 1, wherein the acrylic emulsion is a silicone-acrylic emulsion and a styrene-acrylic emulsion in a weight ratio of (8-12): (0.5-1.5).
  8. 8. The method for producing a repair material according to any one of claims 1 to 7, comprising the steps of: Uniformly mixing the cement, the high-strength non-shrinkage grouting material and the modified diatomite to obtain a dry material; Uniformly dispersing the acrylic emulsion and other components in the water to obtain a mixed solution; And adding the mixed solution into the dry material, and stirring for 40-80s to obtain the repair material.
  9. 9. Use of the repair material according to any one of claims 1-7 in rail transit equipment repair.
  10. 10. Use of the repair material according to claim 9 in the repair of rail transit equipment, the rail transit equipment being a rail roof wind tunnel.

Description

Repair material and preparation method and application thereof Technical Field The application relates to the technical field of rail transit equipment repair, in particular to a repair material, a preparation method and application thereof. Background In the subway station structure, the rail top air duct bears the task of subway air exhaust and air supply, and is an important component of the subway station structure. Because of the specificity of the position of the rail top air channel, the rail top air channel is not cast with the station main body generally, and particularly in the station through which the shield construction needs to pass, the rail top air channel must be cast in a later period. In the construction method of utilizing later casting, the construction space of the rail top air channel is narrow, and the cross section of the rail top air channel is large, so that concrete bubbles are not easy to remove, air holes are large, particularly, the air holes on the inner bottom surface of the U-shaped component are particularly obvious, the appearance quality is poor, holes are easy to appear, and the rail top air channel is easy to damage. Disclosure of Invention The application provides a repairing material and a preparation method and application thereof, in order to reduce bubbles and hollows of a rail top air channel and improve appearance quality of the rail top air channel. In the first aspect, the application provides a repairing material, which specifically comprises, by weight, 100-130 parts of cement, 20-30 parts of H60 type high-strength shrinkage-free grouting material, 2-5 parts of modified diatomite, 4-8 parts of acrylic emulsion, 0.01-0.08 part of defoamer, 0.02-0.12 part of thickener, 0.004-0.012 part of water repellent, 0.01-0.05 part of film forming additive and 40-60 parts of water; The preparation method of the modified diatomite comprises the steps of adding diatomite into the diatomite to perform constant-temperature reaction for 3-5h under the condition that the temperature is 80-100 ℃ and the concentration is 0.2-0.8wt% of phosphoric acid aqueous solution as a solvent and ethyl cellulose as a modifier, cooling the reaction solution to room temperature, filtering and drying to obtain the modified diatomite, wherein the weight ratio of the ethyl cellulose to the diatomite is (6-8) in the range of (1-3). The application uses phosphoric acid aqueous solution with a certain concentration as a solvent and ethyl cellulose as a modifier to modify diatomite to prepare modified diatomite, and then the modified diatomite is matched with cement, high-strength non-shrinkage grouting material, acrylic emulsion and other auxiliary material components to obtain a repairing material. Compared with common unmodified diatomite, the diatomite modified by using the aqueous solution of phosphoric acid with phosphoric acid functional groups as a solvent and using the ethylcellulose with the functions of adhesion, filling and film forming as a modifier reduces the viscosity of the diatomite self structure and reduces the phenomenon of self agglomeration and aggregation of the diatomite, thereby improving the dispersibility of the diatomite in a repairing material system. The repairing material prepared by the application has strong surface binding force with the concrete to be repaired, a compact curing film can be quickly formed on the surface after the repairing material is coated, and the modified diatomite can block capillary pore channels of the concrete and the high-strength non-shrinkage grouting material, so that the surface of the repairing material is isolated from air, thereby preventing water evaporation, improving the curing effect and enabling the repairing material to finish hydration by utilizing the water of the repairing material to the maximum extent. Therefore, the modified diatomite provided by the application is used for preparing the repair material, has higher bonding strength after repairing the rail top air duct, and enables the repaired sample to have higher impermeability and water resistance through special clamping and interface barrier effects. The modified diatomite prepared by the method can be well compatible with cement, high-strength shrinkage-free grouting material, acrylic emulsion and other auxiliary materials, the viscosity and system stability of the repair material are regulated, so that the water in the repair material slurry is uniformly distributed, the modified diatomite can provide larger steric hindrance for the repair material, the dispersion performance of each component is improved, the condition that long side chain substances in the repair material are curled and wound to cause agglomeration can be effectively avoided, the cement is further kept to be good in fluidity, the ageing resistance effect of the repair material is not influenced due to the fact that the repair material is migrated, separated out and the like along with the time, a