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CN-121974656-A - Preparation method of light high-strength phosphate cement-based anti-slip coating

CN121974656ACN 121974656 ACN121974656 ACN 121974656ACN-121974656-A

Abstract

The invention relates to the technical field of building engineering materials, and particularly discloses a preparation method of a light high-strength phosphate cement-based anti-slip coating. The method comprises the steps of firstly preparing core-shell structure functional aggregate with a nano alumina and silicon dioxide composite shell, then dividing dry powder of magnesium phosphate cement, the aggregate and the like into A, B components based on gradient design, additionally enriching the aggregate and improving the fiber quantity of the component B, further stirring the component B into bottom-layer slurry and surface-layer slurry in a step-by-step manner, sequentially rolling and coating the two-layer slurry on a concrete base surface, embossing to form macroscopic texture before initial setting of the surface layer, and then enhancing roughness through napping treatment, and finally naturally curing for 1-2 hours to open traffic. The invention makes the coating have the comprehensive properties of light weight, high strength, high adhesion, high wear resistance and fast passing through the core-shell aggregate reinforcement, gradient batching and rolling coating-embossing integrated construction, and is suitable for the high-efficiency durable repair of concrete pavement of airport runways, expressways and the like.

Inventors

  • WU FANGZHENG
  • XU KUNKUN
  • YU XIAOHONG
  • ZHAO GUANGLEI

Assignees

  • 杭州修路人科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260226

Claims (10)

  1. 1. The preparation method of the light high-strength phosphate cement-based anti-slip coating is characterized by comprising the following steps of: S1, preparing a core-shell structure functional aggregate, namely coating a layer of reinforced shell formed by nano aluminum oxide and nano silicon dioxide generated by hydrolysis of an aluminum dihydrogen phosphate solution on the surface of the core-shell structure functional aggregate by using a closed-pore ceramic hollow microsphere as an inner core through a sol-gel method, and drying and slightly sintering the core-shell structure functional aggregate; S2, preparing gradient functional dry powder, namely uniformly mixing 100 parts of magnesium phosphate cement, 25-45 parts of core-shell structure functional aggregate obtained in the step S1, 15-25 parts of active mineral admixture, 0.8-1.5 parts of plastic stabilizer and 1-2 parts of fiber according to parts by weight to obtain total dry powder, wherein the total dry powder is divided into dry powder of A component and dry powder of B component according to the mass ratio of 70-80 percent, and the dry powder of B component is additionally added with the core-shell structure functional aggregate accounting for 30-50 percent of the dry powder of B component, and meanwhile, the fiber doping amount in the core-shell structure functional aggregate is increased by 30-50 percent compared with that of the dry powder of A component; S3, preparing functional slurry step by step, namely stirring the dry powder of the component A with water accounting for 12-14% of the total weight of the dry powder to prepare bottom slurry, and stirring the dry powder of the component B with water accounting for 9-11% of the total weight of the dry powder to prepare surface slurry; S4, rolling coating and texture construction, namely rolling coating the bottom layer slurry on a treated concrete base surface, rolling coating the surface layer slurry on the treated concrete base surface before initial setting, controlling the total wet film thickness to be 0.7-1.0mm, and carrying out imprinting treatment on the surface layer slurry by adopting a surface imprinting tool to construct macroscopic textures; s5, roughening treatment, namely roughening treatment is carried out on the surface of the coating after imprinting, so that the depth of surface texture is further increased; s6, curing, namely naturally curing for 1-2 hours after construction.
  2. 2. The method according to claim 1, wherein in the step S1, the coating thickness of the reinforced shell is 5-15 μm, and the average particle size of the closed-cell ceramic hollow microspheres is 50-150 μm.
  3. 3. The method according to claim 1, wherein in the step S1, the sol-gel method comprises: a. Mixing and hydrolyzing ethyl orthosilicate, ethanol, deionized water and hydrochloric acid according to the mol ratio of 1 (3-5) (2-4) (0.01-0.05) to prepare SiO 2 sol; b. Adding aluminum dihydrogen phosphate solution with the mass of 10-15% of that of ethyl orthosilicate into the SiO 2 sol, uniformly stirring, and then adding a silane coupling agent to obtain composite sol; c. Immersing the closed-cell ceramic hollow microspheres in the composite sol, taking out, drying and slightly sintering at 400-500 ℃ for 0.5-2 hours.
  4. 4. The method of claim 3, wherein the silane coupling agent is gamma-aminopropyl triethoxysilane or gamma-glycidol ether oxypropyl trimethoxysilane, and the addition amount is 1-3% of the mass of the ethyl orthosilicate.
  5. 5. The preparation method of claim 1, wherein in the step S2, the active mineral admixture is formed by compounding silica fume, micro-bead blast furnace slag powder and metakaolin according to the mass ratio of (2-3): 1-2): 1.
  6. 6. The method according to claim 1, wherein in the step S2, the plastic stabilizer is hydroxypropyl methylcellulose ether, and the fiber is PVA fiber with a length of 3-6 mm.
  7. 7. The method according to claim 1, wherein in the step S4, the roll coating thickness of the underlying paste is 0.2-0.3mm, the surface embossing tool is an embossing cylinder or an embossing template with raised ribs, and macroscopic grooves with a depth of 0.3-0.6mm and a width of 1-3mm are formed on the surface of the paste after embossing.
  8. 8. A core-shell structure functional aggregate is characterized in that the core-shell structure functional aggregate is prepared by the method of claim 3 or 4, the core of the core-shell structure functional aggregate is closed-pore ceramic hollow microsphere, the shell is a nano alumina and nano silica composite reinforcing layer, and the shell has chemical affinity with a magnesium phosphate cement matrix.
  9. 9. A gradient functional dry powder composition is characterized by comprising an A-component dry powder and a B-component dry powder, wherein: the component A dry powder comprises magnesium phosphate cement, core-shell structure functional aggregate, active mineral admixture, plastic stabilizer and fiber; the component B dry powder is additionally rich in 30-50% of the core-shell structure functional aggregate on the basis of the component A, and the fiber doping amount is increased by 30-50%; The core-shell structure functional aggregate is the aggregate of claim 8.
  10. 10. The application of the light high-strength phosphate cement-based anti-slip coating in repairing the anti-slip surface layer of the traffic engineering concrete pavement is characterized in that the anti-slip coating is prepared by the method of any one of claims 1-7.

Description

Preparation method of light high-strength phosphate cement-based anti-slip coating Technical Field The invention relates to the technical field of building engineering materials, and particularly discloses a preparation method of a light high-strength phosphate cement-based anti-slip coating. Background The surface of cement concrete pavement, especially airport runway and expressway which bear high-strength impact, friction and harsh environment effects, is extremely easy to cause diseases such as cement slurry loss, exposed aggregate, and declining anti-slip performance under the multi-factor coupling effects of deicing salt, tire abrasion, freeze thawing cycle and the like. The method not only affects the driving safety, but also greatly shortens the service life of the road surface. The traditional surface layer repairing technology is mainly divided into two major categories, namely an organic polymer mortar with epoxy resin as a representative, which has the advantages of high strength and high adhesion, but has large brittleness, obvious thermal expansion coefficient and concrete difference, is easy to be debonded and peeled off in whole sheets under temperature stress and fatigue load, and has insufficient durability, and an inorganic repairing material with quick-hardening silicate cement as a main component, which has low adhesion strength, difficult to be compatible with early strength development, shrinkage control and matching with old concrete, has larger density and increases structural burden. In recent years, research has progressed around lightweight high-strength building materials. For example, chinese patent publication No. CN113582627a (a nano-alumina modified ultra-lightweight cement-based composite material and a method for preparing the same) prepares a low density board by introducing hollow microspheres and nano-alumina, but the whole composite material is concerned, and the anti-slip function design and the rapid construction process for repairing the surface thin layer are not involved. Chinese patent publication No. CN113277786A (a strong-durability coating protection cement-based composite material and a preparation method) adopts an organic-inorganic composite coating to improve durability, but has complex process, long-term compatibility of an organic phase and an inorganic matrix and performance under dynamic load to be verified. More similar prior art, such as some road surface anti-slip coatings, are modified by adopting simple doping lightweight aggregate or polymer, and fail to systematically solve the contradiction between 'lightweight' and 'high strength/high toughness/high adhesion' in thin layer repair and the interface failure problem caused by unmatched physical and mechanical properties between the coating and a matrix. Therefore, development of a novel light high-strength anti-slip coating, which has low density, high early strength, excellent interface bonding reliability, excellent wear resistance and impact resistance, good environmental durability, and can be implemented by a rapid and simple process, has become an urgent need in the fields of preventive maintenance and rapid repair of pavement. The invention aims to provide a solution with excellent comprehensive performance and high reliability through material design and process innovation. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a preparation method of a light high-strength phosphate cement-based anti-slip coating. The method successfully prepares the thin-layer repairing coating which has low density, rapid early strength development, extremely high interface bonding reliability, excellent wear resistance and skid resistance and is highly matched with the concrete matrix in key physical and mechanical properties such as thermal expansion coefficient, elastic modulus and the like through three core technologies of original phosphate-based core-shell functional aggregate, gradient functional dry powder and slurry design and rolling coating-embossing integrated construction. The coating is particularly suitable for scenes such as airport runways, long and large longitudinal slopes of highways, bridge decks and the like which have severe requirements on repair speed and durability. A preparation method of a light high-strength phosphate cement-based anti-slip coating comprises the following steps: S1, preparing a core-shell structure functional aggregate, namely coating a layer of reinforced shell formed by nano aluminum oxide and nano silicon dioxide generated by hydrolysis of an aluminum dihydrogen phosphate solution on the surface of the core-shell structure functional aggregate by using a closed-pore ceramic hollow microsphere as an inner core through a sol-gel method, and drying and slightly sintering the core-shell structure functional aggregate; S2, preparing gradient functional dry powder, namely uniformly mixing 100 parts of magnesium phosphat