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CN-118184214-B - Thermal sustained-release repair material and thermal sustained-release capsule suitable for cold area rush-repair engineering and preparation method thereof

CN118184214BCN 118184214 BCN118184214 BCN 118184214BCN-118184214-B

Abstract

The invention discloses a thermal sustained-release repair material and a thermal sustained-release capsule suitable for cold area rush-repair engineering and a preparation method thereof, wherein the thermal sustained-release repair material suitable for cold area rush-repair engineering comprises the following raw materials, by weight, 40-70 parts of silicate cement, 22.5-45 parts of sulphoaluminate cement, 7.5-15 parts of gypsum, 1-5 parts of thermal sustained-release capsule, 97-103 parts of quartz sand, 25.5-26.5 parts of water and 0.25-0.35 part of high-efficiency water reducer. The invention is doped with the heat release quantity and the heat release rate of which can be controlled, forms an artificially controllable heat source in the repair material matrix, solves the problems of slow strength development and even frost damage and the like caused by the influence of low temperature of the cement-based repair material in cold weather, and is beneficial to reducing the dependence of cold area rush-repair engineering on external heat sources and reducing the high energy consumption and high carbon emission generated thereby.

Inventors

  • ZHANG GE
  • HAO YIXIN
  • LI GUOXIN

Assignees

  • 西安建筑科技大学

Dates

Publication Date
20260508
Application Date
20240312

Claims (10)

  1. 1. The preparation method of the thermal sustained-release capsule is characterized by comprising the following steps: Grinding and uniformly mixing limestone, saccharin sodium and ethyl maltol to obtain first powder, wherein the mass ratio of the limestone to the saccharin sodium to the ethyl maltol is (995-1005): 0.17-0.23): 0.08-0.12; Uniformly mixing (8-10) the first powder with deionized water according to the mass ratio of (8-10), compacting and drying to obtain a blank; Preserving the temperature of the blank at 1095-1105 ℃ for 115-125min, and then performing air cooling to obtain a calcium oxide material; grinding the calcium oxide material into powder to obtain second powder; And mixing and stirring the second powder and the methacrylate silane uniformly at the weight ratio of (5.7-6.3) of 23-28 ℃, then heating to 48-52 ℃, and then stirring the materials under the atmosphere of saturated steam and carbon dioxide gas to obtain the thermal sustained-release capsule taking calcium oxide as a capsule core and methacrylate silane and calcium carbonate as shells.
  2. 2. The method for preparing a thermal sustained-release capsule according to claim 1, wherein the particle size of the second powder is 200 mesh or more.
  3. 3. A thermal sustained-release capsule, characterized in that it is produced by the production method according to claim 1 or 2.
  4. 4. The thermal slow-release repair material suitable for cold area rush-repair engineering is characterized by comprising the following raw materials in parts by mass: 40-70 parts of silicate cement, 22.5-45 parts of sulphoaluminate cement, 7.5-15 parts of gypsum, 1-5 parts of the thermal sustained-release capsule of claim 3, 97-103 parts of quartz sand, 25.5-26.5 parts of water and 0.25-0.35 part of high-efficiency water reducer.
  5. 5. The thermal sustained-release repair material for cold area rush-repair engineering according to claim 4 wherein said Portland cement is P.O52.5R cement.
  6. 6. The thermal sustained-release repair material for cold area rush-repair engineering according to claim 4 wherein said sulfoaluminate cement is 72.5 cement.
  7. 7. The thermal sustained-release repair material for cold area rush-repair works of claim 4 wherein said gypsum is dihydrate gypsum.
  8. 8. The thermal sustained-release repair material suitable for cold area rush-repair engineering according to claim 5, wherein the high-efficiency water reducer adopts a polycarboxylate water reducer.
  9. 9. The method for preparing the thermal sustained-release repair material suitable for cold area rush-repair engineering according to any one of claims 4 to 8, which is characterized by comprising the following steps: Mixing silicate cement, sulphoaluminate cement, gypsum, a thermal slow-release capsule and quartz sand uniformly to obtain uniform raw materials; sealing and pre-cooling the raw materials to obtain pre-cooled raw materials, wherein the pre-cooling temperature is consistent with the maintenance temperature; Mixing the high-efficiency water reducer with water to dissolve the high-efficiency water reducer, so as to obtain a uniform solution; and mixing and stirring the precooled raw material and the uniform solution to form uniform slurry, so as to obtain the thermal slow-release repair material suitable for cold area rush-repair engineering.
  10. 10. The method for preparing a thermal sustained-release repair material suitable for cold area rush-repair engineering according to claim 9, wherein when the precooled raw material and the uniform solution are mixed and stirred to form uniform slurry: Stirring at low speed for 3-4min, and stirring at high speed for 2-3min to obtain uniform slurry; wherein the stirring speed of low-speed stirring is 135-145r/min, and the stirring speed of high-speed stirring is 280-290r/min.

Description

Thermal sustained-release repair material and thermal sustained-release capsule suitable for cold area rush-repair engineering and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and particularly relates to a thermal sustained-release repair material and a thermal sustained-release capsule suitable for cold area rush-repair engineering and a preparation method thereof. Background The cold environment has a great negative impact on the safety and efficiency of the rush repair project. On the other hand, when the water in the repairing material is frozen, about 9 percent of volume expansion, water migration and water redistribution caused by chemical potential difference of different parts after the macroporous is frozen, crystallization pressure caused by different pore inlets and internal curvatures and the like can generate huge frost heaving stress, thereby causing irreversible damage to the performance of the repairing material and seriously affecting the safety of the rush repair engineering in cold environment. In order to avoid freezing of liquid phase in the repairing material and promote continuous and rapid hydration of cement in a low-temperature environment and ensure safety and efficiency of the rush-repair engineering, people often use an external heat preservation method to improve the environment temperature of the repairing material in the early stage, and the implementation process not only needs to consume a large amount of manpower, material resources and financial resources, but also is contrary to the aim of green sustainable development in consumption of a large amount of energy and emission of carbon dioxide. In addition, the antifreeze method is another commonly used method, but uneven stirring of the antifreeze in the construction process can seriously reduce the antifreeze effect and damage the economic benefit, and the durability problem caused by the inorganic salt antifreeze can adversely affect the quality and long-term use of the construction engineering. Therefore, the repair material is taken as an entry point, and a heat source is introduced into the repair material, so that the research of the thermal slow-release repair material suitable for cold area rush-repair engineering is important. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide a thermal sustained-release repair material and a thermal sustained-release capsule suitable for cold area rush-repair engineering and a preparation method thereof. In order to achieve the above purpose, the invention adopts the following technical scheme: A preparation method of a thermal sustained-release capsule comprises the following steps: Grinding and uniformly mixing limestone, saccharin sodium and ethyl maltol to obtain first powder, wherein the mass ratio of the limestone to the saccharin sodium to the ethyl maltol is (995-1005): 0.17-0.23): 0.08-0.12; Uniformly mixing (8-10) the first powder with deionized water according to the mass ratio of (8-10), compacting and drying to obtain a blank; Preserving the temperature of the blank at 1095-1105 ℃ for 115-125min, and then performing air cooling to obtain a calcium oxide material; grinding the calcium oxide material into powder to obtain second powder; And mixing and stirring the second powder and the methacrylate silane uniformly at the weight ratio of (5.7-6.3) of 23-28 ℃, then heating to 48-52 ℃, and then stirring the materials under the atmosphere of saturated steam and carbon dioxide gas to obtain the thermal sustained-release capsule taking calcium oxide as a capsule core and methacrylate silane and calcium carbonate as shells. Preferably, the particle size of the second powder is above 200 meshes. The invention also provides a thermal sustained-release capsule which is prepared by the preparation method. The invention also provides a thermal slow-release repair material suitable for cold area rush-repair engineering, which comprises the following raw materials in parts by mass: 40-70 parts of silicate cement, 22.5-45 parts of sulphoaluminate cement, 7.5-15 parts of gypsum, 1-5 parts of the heat slow-release capsule disclosed by the invention, 97-103 parts of quartz sand, 25.5-26.5 parts of water and 0.25-0.35 part of high-efficiency water reducer. Preferably, the Portland cement is P.O52.5R cement. Preferably, the sulphoaluminate cement is 72.5 cement. Preferably, the gypsum is dihydrate gypsum. Preferably, the water reducer adopts a polycarboxylate water reducer. The preparation method of the thermal slow-release repair material suitable for cold area rush-repair engineering disclosed by the invention comprises the following steps: Mixing silicate cement, sulphoaluminate cement, gypsum, a thermal slow-release capsule and quartz sand uniformly to obtain uniform raw materials; sealing and pre-cooling the raw materials to obtain pre-cooled raw materials, wherein