A high durability airport pavement quick repair composition, a preparation method and a quick repair method

Abstract

A kind of high durability airport pavement quick repair composition and preparation method and quick repair method, by mass parts, quick repair composition includes cementitious material 80-130 parts, aggregate 90-120 parts, fiber material 10-20 parts, functional material 15-40 parts;Fiber material includes at least one of PVA fiber, cellulose fiber;Functional material includes polyacrylate, calcium carbonate, active titanium dioxide and self-repairing microcapsule;Self-repairing microcapsule, 15-50% of the total mass of functional material, including repair core layer, resin shell layer and the fiber repair layer adhered to the surface of resin shell layer, repair core layer includes inorganic repair mixture, resin shell layer includes toughened resin composition.The application utilizes the quick repair composition with excellent comprehensive performance and the quick repair method adapted, ensures that repair layer and old base form strong and tough interface synergistic effect, simultaneously realizes to crack high-efficiency trigger, environmental robust and long-acting stable self-repairing function.

Description

Technical Field

[0001] This invention relates to the field of rapid airport pavement repair technology, specifically to a high-durability rapid airport pavement repair composition, its preparation method, and its rapid repair method. Background Technology

[0002] Airport pavements, as critical infrastructure for aircraft takeoff, landing, and taxiing, are subjected to high impact loads, environmental erosion, and frequent mechanical wear over long periods, making them highly susceptible to defects such as cracks and spalling. These defects not only affect flight safety, but their rapid repair is also crucial for ensuring efficient airport operations. Traditional cement concrete repair materials suffer from slow early strength development, large shrinkage, and weak adhesion to the old substrate, making it difficult to meet the stringent requirements of airports for "short-term closure and rapid reopening."

[0003] When airport pavement defects occur, repair materials are used for patching. However, existing airport repair materials generally suffer from high early hydration heat, high temperature stress, material expansion, and a tendency to extrude good slabs. Furthermore, the three main categories of existing repair material systems—high-alumina cement systems, organic systems, and phosphate systems—each have varying degrees of defects. High-alumina cement system repair materials experience strength reduction in the later stages and have poor durability; organic system repair materials have poor UV durability, cannot be roughened, and are expensive; phosphate system repair materials cannot be roughened, have a low coefficient of friction, are only slightly soluble in water, have moderate durability, and generate ammonia gas, resulting in numerous surface pores and a tendency to peel. Therefore, developing fast-repair materials with high early strength, excellent durability, and good workability has become an urgent need in the industry.

[0004] The quality of the interfacial bond between quick-repair materials and the old concrete substrate is one of the core factors determining the success or failure of the repair. Current quick-repair processes typically use simple methods such as roughening the substrate, wetting, or applying ordinary interface agents to improve adhesion. However, this method has significant drawbacks: the difference in properties between the new and old materials leads to significant stress concentration at the interface, easily becoming a source of crack initiation and development. Ordinary interface agents lack sufficient compatibility and penetration with the new and old materials, making it difficult to form strong, durable chemical bonds and mechanical interlocking, resulting in limited bond strength and poor durability. More importantly, there is a lack of effective control over the early performance development of the material in the interfacial area. Quick-repair materials often begin to be subjected to environmental effects or subsequent construction disturbances before the interface has developed sufficient strength, leading to poor microstructure development at the interface, forming a weak transition zone, and severely affecting the overall synergistic performance and long-term service life of the repair layer and the substrate. Therefore, developing new interface treatment technologies and supporting processes that can significantly enhance interfacial compatibility and optimize the early performance development of the interfacial area is a key breakthrough for achieving high-durability airport pavement quick repair.

[0005] For example, patent application CN113402240A discloses a super crack-resistant rapid repair material and its preparation method. This rapid repair material is mainly composed of aluminate cement (30-35 parts) supplemented with a small amount of ordinary silicate cement (8-12 parts). This essentially falls under the category of high-alumina cement systems. This invention attempts to control the early hydration rate by adding a retarder and to compensate for shrinkage by adding a composite expansion agent. However, the increased porosity and decreased strength caused by the long-term phase transformation of aluminate cement hydration products are inherent chemical properties that are difficult to completely overcome by simple admixture combinations. More importantly, the elastic modulus, coefficient of thermal expansion, and shrinkage characteristics of this material will inevitably differ from those of the old silicate cement concrete substrate. The lack of a transition layer makes the interface a weak point. Without a specially designed interface agent, relying solely on roughening the substrate or using ordinary interface agents will not easily form strong, durable chemical bonds and mechanical interlocking.

[0006] To improve the service life of materials, self-healing technology has been introduced into cement-based materials. Common self-healing mechanisms, such as the incorporation of microcapsules containing repair agents, release the repair agent upon crack formation to achieve self-healing. However, existing microcapsule technology faces numerous challenges in the high-load environment of airport pavements. First, the interfacial compatibility between microcapsules and the cement matrix is ​​generally poor. During material mixing, laying, and service, microcapsules can easily become weak points or prematurely rupture under stress, affecting the overall mechanical properties and long-term durability of the material. Second, the repair efficiency and triggering efficiency of microcapsules are often limited, especially for deep or recurring cracks, making effective and durable self-healing difficult to achieve. Furthermore, the mechanical properties of the microcapsule shell and its lack of reinforcement of the matrix are also key issues; microcapsules, simply acting as a carrier of the repair agent, cannot contribute positively to material properties beyond crack repair. In addition, there is a lack of effective solutions to the impact of complex environmental factors on the long-term stability of microcapsules. These shortcomings, along with the complexity and cost of the process in practical applications, greatly limit the practical application of self-healing technology in the extreme service environment of airport pavements. For example, patent application CN110436816A discloses a self-healing agent for airport pavements based on microbial capsules, its preparation, and its application. When micro-cracks appear in the concrete layer of an airport pavement during use, the wall material of the microbial capsule ruptures under the stress generated by the cracks. The entry of air and moisture activates the germination of microbial spores in the capsules, inducing the formation of calcium carbonate precipitate through the metabolism of the microorganisms, which can self-repair the micro-cracks. However, this microbial self-healing agent relies on bio-induced mineralization for repair, and its effectiveness is greatly limited by environmental temperature, humidity, pH value, and oxygen conditions. In the variable freeze-thaw, de-icing salt, and dry environments of airport pavements, its activity is easily deactivated, resulting in a slow and uncontrollable repair response.

[0007] Therefore, how to develop a comprehensive repair composition with excellent performance that can ensure a strong and durable interfacial synergistic enhancement effect between the repair layer and the old substrate, while achieving efficient crack triggering, environmental robustness and long-term stable self-healing function, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] To address the shortcomings of the existing technologies, this invention provides a high-durability airport pavement quick-repair composition, its preparation method, and its quick-repair method. It utilizes self-healing microcapsules comprising a repair core layer, a resin shell layer, and a fiber repair layer, combined with basic quick-repair components such as cementitious materials and aggregates. In practical applications, this quick-repair composition is used in conjunction with efficient repair technologies to ensure a strong and durable interfacial synergistic enhancement effect between the repair layer and the old substrate, while simultaneously achieving efficient crack triggering, environmental robustness, and long-term stable self-repair function.

[0009] In a first aspect, the present invention provides a high-durability airport pavement quick repair composition, comprising, by weight, the following components:

[0010] 80-130 parts of cementitious material

[0011] 90-120 parts of aggregate

[0012] 10-20 parts of fiber material

[0013] 15-40 parts of functional materials;

[0014] Fiber materials include at least one of PVA fiber and cellulose fiber;

[0015] The functional materials include polyacrylate, calcium carbonate, active titanium dioxide, and self-healing microcapsules;

[0016] Self-healing microcapsules, accounting for 15-50% of the total mass of functional materials, include a repair core layer, a resin shell layer, and a fiber repair layer adhered to the surface of the resin shell layer. The resin shell layer includes a toughening resin composition.

[0017] The rapid-repair composition provided by this invention exhibits rapid setting and early strength, good crack resistance, anti-slip properties, and durability. Furthermore, the raw materials are widely available, resulting in low manufacturing and usage costs. The self-healing microcapsules provided by this invention possess a triple-effect synergistic function. First, the fiber repair layer, located on the outermost layer of the self-healing microcapsule, has a high surface roughness. After hardening, some fibers are embedded in the surrounding cement matrix, while others adhere to the resin shell. This further anchors the fibers on the microcapsule surface within the matrix, preventing microcapsule detachment and facilitating the microcapsule's responsive repair function under external forces. Especially when using fibers with irregular / irregular cross-sectional shapes, the increased fiber surface area enhances the contact area between the anchoring fibers and the cement matrix. When the hardened cement matrix is ​​subjected to excessive loads, the fibers function as bridges and stress transfer agents, rapidly spreading and forming more microcracks at the contact interface, preventing undesirable large cracks from appearing in the matrix. Furthermore, since self-healing substances such as calcium carbonate can deposit around the fibers, the aforementioned microcracks exhibit a certain self-healing tendency. Secondly, the resin shell uses a toughening resin composition, which connects the fiber layer and protects the repair core layer from premature degradation or damage. The shell itself also has good strength and toughness, and can absorb a certain amount of external impact. When microcracks develop in airport pavements (such as runways and taxiways) under aircraft loads, the microcapsule resin shell ruptures due to stress concentration. The released inorganic repair mixture reacts with moisture or CO2 at the crack to generate calcium silicate gel or calcium carbonate crystals, which fill the crack, restore structural integrity and mechanical properties, and the broken resin shell and fiber layer further prevent crack propagation and improve the strength after repair.

[0018] Preferably, the cementitious material comprises, by weight, the following:

[0019] Portland cement PII52.5, 44-60 parts

[0020] 16-30 parts of sulfoaluminate cement

[0021] 12-20 parts of fluoroaluminate rapid-hardening cement

[0022] 8-20 parts of silicate cement with early strength;

[0023] The aggregate includes:

[0024] 10-20 parts fine sand

[0025] 80-100 parts coarse aggregate.

[0026] The fiber material includes:

[0027] 5-10 parts of PVA fiber

[0028] 5-10 parts of cellulose fiber.

[0029] Preferably, the PVA fibers and cellulose fibers undergo surface activation treatment, including corona treatment or plasma treatment;

[0030] The PVA fibers after surface activation treatment are then modified with an aminosilane coupling agent to obtain amino-modified PVA fibers.

[0031] The surface-activated cellulose fibers are premixed with the polyacrylate to form pre-coated cellulose fibers.

[0032] Cellulose fibers are surface activated by corona treatment or plasma treatment, which helps to introduce active groups to improve the compatibility and interfacial bonding between the fiber and the surrounding matrix. Premixing the activated cellulose fibers with polyacrylate further enhances the compatibility and bonding of the fibers in the quick repair system, improves the mechanical properties of the composition, and the surface activation only involves a nanoscale thin layer on the fiber surface, without affecting the bulk structure and strength.

[0033] To further enhance the bonding tightness between the fiber and the organic-inorganic material matrix of the composition, and improve the mechanical properties of the quick-repair material, the amino-modified PVA fiber can be further grafted and modified using a single-terminal epoxy polyether. This includes dispersing the amino-modified PVA fiber in an organic solvent and adding the single-terminal epoxy polyether for reaction. Optionally, the chemical formula of the single-terminal epoxy polyether is (CH2CH)OCH2O(PO)m(EO)nR, where PO represents -CH2CH3CHO-, EO represents -CH2CH2O-, 10≤m≤100, 5≤n≤70, and |mn|≤30, and R is a C1-C4 alkyl or H. Preferably, the ratio of the molar number of amino groups in the amino-modified PVA fiber to the molar number of the single-terminal epoxy polyether is 1:(1-3).

[0034] The PVA fibers of this invention are endowed with multiple functional properties through a three-stage modification process: First, corona or plasma treatment is used to construct micro-nano groove structures on the fiber surface, significantly increasing the fiber's specific surface area and reactivity; subsequently, basic amino groups are introduced through modification with an aminosilane coupling agent, significantly enhancing the chemical bonding between the fiber and the cement matrix; furthermore, a polymer brush layer with a precisely controlled hydrophobic-hydrophilic balance is formed on the fiber surface through single-end epoxy polyether grafting, wherein long-chain PO blocks provide hydrophobic protection, EO blocks optimize interfacial stress transfer, and strictly controlled segment ratios (10≤m≤100, 5≤n≤70, |mn|≤30) ensure the structural stability and mechanical properties of the grafted layer. This multi-stage modification design enables the PVA fibers to simultaneously possess excellent interfacial bonding strength, environmental durability, and stress transfer efficiency, effectively overcoming the technical challenges of traditional PVA fibers being prone to degradation and interfacial slippage in alkaline environments.

[0035] Preferably, the composition further includes 5-15 parts of auxiliary materials, said auxiliary materials including at least one of water-reducing agent, defoamer, coagulant aid and expansion agent;

[0036] The water-reducing agent includes at least one of HM type water-reducing agent, MY type water-reducing agent or NF high-efficiency water-reducing agent;

[0037] The defoamer includes at least one of emulsified silicone oil or polydimethylsiloxane;

[0038] The coagulant aids include bauxite, sodium carbonate and quicklime, with a mass ratio of (5-7):(2-4):(1-3).

[0039] The expansive agent is preferably a type I calcium sulfoaluminate concrete expansive agent, which can react to generate micro-expansion crystals, block capillary channels, and improve compactness and durability.

[0040] Preferably, in the self-healing microcapsule, the mass ratio of the repair core layer, the resin shell layer, and the fiber repair layer is 100:(10-40):(3-10).

[0041] The repair core layer consists of volcanic ash, fly ash and nano-SiO2 mixed in a mass ratio of (6-9):(4-6):(4-7);

[0042] The toughening resin composition comprises an epoxy resin and a rubber toughening agent in a mass ratio of (4-7):(1-3), wherein the epoxy resin includes at least one of naphthalene-type epoxy resin and bridged ring-type epoxy resin, and the rubber toughening agent includes at least one of nitrile rubber, polyurethane rubber, chloroprene rubber, and silicone rubber.

[0043] The fiber repair layer includes chopped fibers with a non-circular cross-section, a diameter of 2-15 μm, and a length of less than 5 mm. The chopped fibers include at least one of carbon fiber and polypropylene fiber.

[0044] Compared to traditional circular fibers, elliptical, polygonal, or flat cross-sections significantly increase the contact area between the fiber and the resin shell. Simultaneously, the abrupt changes in cross-sectional curvature create multiple microscopic mechanical anchoring points; for example, the long axis end of an elliptical cross-section generates a stress-locking effect. When the fiber is embedded in the cement matrix, the asymmetric cross-section induces a three-dimensional stress field under load, forcing the matrix material to undergo directional deformation, thereby strengthening the interlocking effect and diverting impact energy through the anisotropic nature of the cross-section. This structure, combined with micrometer-level diameter and millimeter-level length control, avoids stress concentration caused by excessive fiber rigidity while ensuring uniform dispersion during mixing and forming a cross-scale interpenetrating structure with the main fiber network. Ultimately, this makes the fiber repair layer a strong "rib" connecting the microcapsule functional units and the cement matrix, significantly reducing the risk of interfacial delamination.

[0045] Preferably, the epoxy resin comprises a naphthalene-type epoxy resin and a bridged ring-type epoxy resin in a mass ratio of (5-8):(3-6);

[0046] The rubber toughening agent includes carboxyl-terminated butadiene-acrylonitrile rubber and chloroprene rubber in a mass ratio of (6-9):(1-4).

[0047] "Naphthalene-type epoxy resin" refers to an epoxy resin containing a naphthalene ring structure; "bridged ring type epoxy resin" refers to an epoxy resin containing a bridged ring structure. The naphthalene-type epoxy resin used in this invention is, for example, but not limited to, Formula I and Formula II:

[0048] (Formula I);

[0049] (Formula II);

[0050] The bridge-type epoxy resin used in this invention is, for example, but not limited to, Formula III:

[0051] (Formula III).

[0052] Naphthalene-based and bridged-ring epoxy resins exhibit complementary curing characteristics and mechanical properties due to their unique molecular structures: naphthalene-based epoxy resins excel in curing speed, processability, and overall mechanical properties, enabling efficient pre-curing during construction to meet process window requirements; while bridged-ring epoxy resins are known for their ultra-high thermal stability and chemical resistance, providing durable compressive strength and environmental barriers for the microcapsule shell, but their cost is relatively higher than that of naphthalene-based epoxy resins. By dynamically adjusting the blending ratio of the two, the manufacturing efficiency and service performance of the microcapsules can be precisely synergistically optimized—increasing the proportion of naphthalene-based epoxy resin accelerates the pre-curing process while retaining appropriate flexibility to buffer impacts, while increasing the proportion of bridged-ring epoxy resin strengthens the cross-linking network density to resist high-frequency loads on the pavement and environmental erosion. This molecular-level synergistic design fundamentally solves the inherent contradictions between curing speed, mechanical strength, long-term durability, and cost in traditional materials, providing a core guarantee for the functional reliability of self-healing microcapsules under harsh airport conditions.

[0053] Introducing rubber toughening agents into epoxy resin systems is an effective method to improve their brittleness, impact resistance, and fracture toughness. The core mechanism of rubber toughening is energy absorption through the "induction of crazing," "shear yielding," or "phase separation to form a stable dispersed phase" in the rubber phase. Carboxyl-terminated nitrile butadiene rubber (CTBN) has good compatibility with epoxy resins and a significant toughening effect, simultaneously improving toughness and heat resistance. The flexible segmental dispersed phase formed by the reaction induces crazing, shear yielding, or cavitation under stress, absorbing energy. Chloroprene rubber (CR) has good aging resistance and toughening effect, and its cost is lower than that of carboxyl-terminated nitrile butadiene rubber.

[0054] Preferably, the self-healing microcapsules are prepared through the following steps:

[0055] Step 1: Preparation of the repair core layer by mixing and granulation:

[0056] Mix the core repair material with an appropriate amount of deionized water, emulsify and granulate, dry and sieve; specifically, dry mix volcanic ash, fly ash and nano SiO2 for 15-30 minutes, add deionized water with a water-to-solid ratio of 1:(5-10), mix, emulsify and granulate, dry and sieve.

[0057] Step 2: Prepare the pre-cured resin layer to encapsulate the repair core:

[0058] The resin shell material is mixed evenly and vacuum stirred until no air bubbles are present to form the shell coating material; optionally, the resin shell material includes epoxy resin, rubber toughening agent, diluent, and photoinitiator;

[0059] The outer shell coating material is applied and wraps the repair core layer, and pre-cured to form a pre-cured resin layer covering the repair core layer; the pre-curing method can be either heating pre-curing with controlled input heat or UV light pre-curing;

[0060] Step 3: Preparation of the resin shell and fiber repair layer:

[0061] Short fibers are dispersed onto the surface of a pre-cured resin layer, and the resin layer is cured to obtain a fiber repair layer that adheres to the surface of the resin shell layer.

[0062] In the resin shell material, the diluent is an active diluent, which may include at least one of polyether polyol, glycidyl ether, and oxetane. The amount added is 10-15% of the epoxy resin mass. Its low viscosity is beneficial for the resin shell material to coat and repair the core layer, and it is also compatible with the alkaline environment in concrete. The photoinitiator is selected from at least one of diazonium salt, diaryliodomonium salt, triarylthionium salt, and alkylthionium salt, and the amount added is 1-2% of the epoxy resin mass.

[0063] The resin shell material may also include at least one of the following: defoamer, leveling agent, and accelerator. Defoamers help eliminate air bubbles generated during resin coating, preventing the formation of pores in the microcapsule shell and stress concentration; silicone-based defoamers are preferred. Leveling agents improve the flowability and uniformity of the resin coating by reducing the viscosity of the resin system, balancing the surface tension gradient, eliminating the "orange peel" effect, and reducing shell thickness deviation; acrylate-based leveling agents are preferred. Accelerators include silane coupling agents.

[0064] Preferably, the preparation of self-healing microcapsules satisfies at least one of the following:

[0065] In step one, the particle size of the repaired core layer is 0.3-3 mm;

[0066] In step two, the pre-curing degree is below 40%;

[0067] In step three, before being dispersed onto the surface of the pre-cured resin layer, the chopped fibers undergo a surface activation treatment, wherein the surface activation treatment is selected from at least one of corona discharge treatment, plasma treatment, and ozone treatment.

[0068] Preferably, UV light pre-curing is used, employing a medium-pressure mercury lamp with a wavelength of 365-405nm and a light intensity of 80-100mW / cm². 2 Exposure time is 30-45 seconds to ensure pre-curing degree ≤40% to retain subsequent curing activity. Preferably, the pre-curing degree is 20-30%. More preferably, a medium-pressure mercury lamp is used in conjunction with a light diffusion cover to achieve uniform irradiation and avoid local over-curing.

[0069] Secondly, the present invention also provides a method for preparing the aforementioned high-durability airport pavement quick repair composition, comprising the following steps:

[0070] 1) Preparation of self-healing microcapsules;

[0071] 2) Surface-activate PVA fibers and cellulose fibers; then premix the surface-activated cellulose fibers with polyacrylate to form pre-coated fibers;

[0072] 3) Dry mix the cementitious materials and aggregates evenly, add an appropriate amount of water, and stir to form a uniform paste; the mixing time for both stages is 5-15 minutes.

[0073] 4) Add the pre-coated fiber, PVA fiber and self-healing microcapsule to the slurry and stir at low speed until homogeneous, about 5-10 minutes.

[0074] 5) Add calcium carbonate, active titanium dioxide and an appropriate amount of water, stir and mix for about 5-10 minutes to obtain a high-durability airport pavement quick repair composition.

[0075] Preferably, the water in step 5) is micro-nano bubble water, which includes water, gas and bubble stabilizer. The gas component is ozone and air in a volume ratio of (1-1.5):1. The bubble stabilizer is an anionic surfactant selected from at least one of sodium dodecyl sulfate or sodium dioctyl sulfosuccinate, with an addition amount of 0.01-0.05 wt%.

[0076] Micro-nano bubble water optimizes material performance through physicochemical synergy: ozone-rich micro-nano bubbles form a high-energy gas-liquid dispersion system under the stabilization of anionic surfactants. The strong oxidizing properties of ozone activate the active sites on the surface of cementitious materials and decompose impurities. Meanwhile, the instantaneous high temperature and high pressure environment generated by bubble collapse stimulates the release of surface energy by active substances such as nano-SiO2, accelerating the nucleation and precipitation of ettringite and CSH gel. At the same time, anionic surfactants form an electrostatic repulsion layer on the surface of cement particles, which, together with the "ball effect" of microbubbles, significantly reduces the viscosity of the slurry and ensures uniform dispersion of fibers and microcapsules.

[0077] Thirdly, the present invention also provides a method for rapid repair of high-durability airport pavement, comprising the following steps using the aforementioned rapid repair composition or the rapid repair composition obtained by the aforementioned preparation method:

[0078] S1. Grind and clean the pavement to be repaired, then spray with silane coupling agent solution.

[0079] S2. Apply an interface repair slurry containing acrylate resin and / or polyurethane resin, and pre-cure to form a continuous interface layer;

[0080] S3. Lay the quick-repair composition and compact and level it;

[0081] S4. Allow the quick-repair composition to set and dry naturally to form a highly durable airport pavement.

[0082] Preferably, in the silane coupling agent solution of step S1, the mass ratio of silane coupling agent, acetic acid, water and alcohol is (1-5):(1-5):(1-5):(85-97).

[0083] Preferably, in step S2, the interface repair slurry is a compound containing polyurethane acrylate, epoxy acrylate and interface toughening agent; the interface toughening agent is selected from at least one of carboxyl-terminated nitrile butadiene rubber and chloroprene rubber, accounting for 5-25% of the total mass of the interface repair slurry.

[0084] Preferably, the interface toughening agent includes carboxyl-terminated nitrile butadiene rubber; more preferably, the mass ratio of polyurethane acrylate, epoxy acrylate and carboxyl-terminated nitrile butadiene rubber is (5-8):(1-3):(1-2).

[0085] Polyurethane acrylate is easy to level and has good bonding strength after curing. The adhesive layer has excellent flexibility, impact resistance, abrasion resistance, oil resistance, and low-temperature resistance, making it adaptable to complex environments. However, its curing speed is relatively slow when used alone. Therefore, epoxy acrylate, which has a faster curing speed and excellent compatibility with the quick-repair composition, was further compounded. Epoxy acrylate has excellent chemical resistance, heat resistance, and electrical properties, and good hardness but slightly lower toughness. Further addition of a small amount of carboxyl-terminated nitrile butadiene rubber helps to balance the curing rate and overall performance of the continuous interface layer. The interface repair slurry is relatively expensive but requires a small amount. Through a well-compatible compound, a continuous interface layer with complementary properties is pre-formed, creating a stable and durable bond between the quick-repair composition and the pavement to be repaired, providing good flexibility and impact resistance. Furthermore, the overall viscosity of the mixed system is easy to adjust, and the compound is easier to handle during construction. For example, in spraying and brushing processes, it can more evenly cover and wet the surface of the pavement to be repaired, improving construction quality and efficiency, and fully leveraging the advantages of the subsequently applied quick-repair composition.

[0086] Preferably, in step S2, UV light pre-curing or heat pre-curing is used, with a pre-curing degree of 50-80%. The degree of light curing is relatively easy to control, which helps to control the time interval so that the quick-repair composition is laid before the continuous interface layer is fully cured. Then, the continuous interface layer can be further cured by the curing exothermic process of the quick-repair composition, while improving its bonding strength with the interface of the quick-repair composition.

[0087] The silane coupling agent is selected from one or a mixture of several of KH550, KH560, KH570 or Nanda 42.

[0088] The rigid cyclic structure of epoxy resin forms a high-strength chemical anchor with the silicate minerals of the old concrete substrate through siloxane bonds established by a silane coupling agent. Simultaneously, its epoxy groups coordinate with Ca²⁺ in the cement hydration products. The carboxyl-terminated nitrile butadiene rubber (NBR) has carboxyl-active functional groups at the ends of its molecular chains, which participate in the epoxy resin curing reaction, forming rubber microdomains. These microdomains, along with the resin, form a "sea-island structure," enhancing the continuous interface layer's resistance to crack propagation. Furthermore, its flexible long chains penetrate into the microcracks of the substrate, forming an elastic buffer network through molecular chain entanglement and crosslinking points. After pre-curing, the slurry forms a semi-interpenetrating network structure: the pre-curing stage partially crosslinks the epoxy resin to form a skeletal support, while the retained active groups and uncured segments provide a reactive interface for subsequent rapid repair compositions.

[0089] The present invention provides at least the following beneficial effects:

[0090] (1) This invention, by combining a composite cementitious system (silicate cement, sulfoaluminate cement, fluoroaluminate rapid-hardening cement, and silicate early-strength cement) with graded aggregates, effectively avoids the core defects of traditional single systems while ensuring the ultra-high early strength characteristics of the material: it solves the hidden danger of strength shrinkage in the later stage of high-alumina cement, and overcomes the problems of poor durability of organic systems and surface deterioration caused by ammonia precipitation in phosphate systems. The introduction of polyacrylate in the functional components further enhances the toughness of the material, while active titanium dioxide gives the environment self-cleaning ability, forming a repair matrix with high crack resistance and excellent weather resistance.

[0091] (2) This invention develops self-healing microcapsules. The core layer, with inorganic active materials as its core, provides rapid crack response capability. The resin shell layer (epoxy resin / rubber toughening agent) significantly improves mechanical impact resistance and prevents construction damage. The non-circular cross-section short-cut fibers adhered to the surface of the resin shell layer form a three-dimensional anchoring layer, which not only strengthens the interfacial bonding strength between the microcapsule and the cement matrix, but also provides primary repair function to the matrix. This design enables the self-healing microcapsules to have efficient triggering repair, environmental tolerance, and synergistic enhancement functions, achieving active and long-term crack repair.

[0092] (3) During the construction process, this invention found that, in addition to the existing pretreatment of the pavement to be repaired, the use of interface repair slurry pre-curing method, with the addition of a continuous interface layer to strengthen the transition between the old and new interfaces, solved the problem of weak interfaces. Secondly, the spraying of silane coupling agent solution can enhance the bonding activity of the substrate, which is conducive to the formation of an elastic modulus gradient transition layer in the interface repair slurry to coordinate stress distribution. The pre-curing process precisely controls the early strength development of the interface area, avoiding microstructural defects caused by environmental disturbances. This synergistic strategy ensures that the repair layer and the old substrate form a strong and durable chemical-mechanical bond, achieving true structural integration. Attached Figure Description

[0093] Figure 1 This is a schematic diagram of the structure of the self-healing microcapsule of the present invention;

[0094] Figure 2 This is a schematic diagram of the process for preparing the high-durability airport pavement quick repair composition of the present invention;

[0095] Figure 3 This is a flowchart illustrating the high-durability airport pavement rapid repair method of the present invention. Detailed Implementation

[0096] To better understand the above technical solution, the following will refer to the appendix to the instruction manual. Figure 1-3The specific implementation methods described herein will be explained in detail to illustrate the above technical solutions. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0097] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0098] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0099] A high-durability airport pavement quick repair composition, comprising the following components in parts by weight:

[0100] (1) Cement binder, 80-130 parts, specifically including:

[0101] Portland cement PII52.5, 44-60 parts

[0102] 16-30 parts of sulfoaluminate cement

[0103] 12-20 parts of fluoroaluminate rapid-hardening cement

[0104] 8-20 parts of silicate cement with early strength;

[0105] (2) Fiber material, 10-20 parts, specifically including:

[0106] 5-10 parts of PVA fiber

[0107] 5-10 parts of cellulose fiber;

[0108] The surface of the cellulose fiber is subjected to corona treatment or plasma treatment, and then premixed with the polyacrylate to form pre-coated cellulose fiber.

[0109] The PVA fiber is preferably modified in three stages:

[0110] First stage: The PVA fiber surface is subjected to corona treatment or plasma treatment to obtain surface-activated PVA fiber;

[0111] Second stage: The surface-activated PVA fibers are modified by an aminosilane coupling agent to obtain amino-modified PVA fibers.

[0112] Third stage: The amino-modified PVA fiber is further grafted with a single-terminal epoxy polyether; the chemical formula of the single-terminal epoxy polyether is (CH2CH)OCH2O(PO)m(EO)nR, where PO represents -CH2CH3CHO-, EO represents -CH2CH2O-, 10≤m≤100, 5≤n≤70, and |mn|≤30, and R is C1-C4 alkyl or H. Preferably, the ratio of the number of moles of amino groups in the amino-modified PVA fiber to the number of moles of the single-terminal epoxy polyether is 1:(1-3).

[0113] (3) Aggregate, 90-120 parts, specifically including:

[0114] 10-20 parts fine sand

[0115] 80-100 parts coarse aggregate;

[0116] (4) Functional materials, 15-40 parts, including polyacrylate, calcium carbonate, active titanium dioxide and self-healing microcapsules, wherein the self-healing microcapsules account for 15-50% of the total mass of the functional materials, including a repair core layer 1, a resin shell layer 2 and a fiber repair layer 3 adhered to the surface of the resin shell layer, see Appendix Figure 1 :

[0117] The repair core layer 1 includes an inorganic repair mixture, which comprises volcanic ash, fly ash and nano-SiO2 mixed in a mass ratio of (6-9):(4-6):(4-7); the mass ratio of volcanic ash to fly ash is (1.5-1.8):1, and the particle size of the repair core layer is 1-2 mm.

[0118] B. Resin shell 2, comprising a toughening resin composition, the toughening resin composition comprising an epoxy resin and a rubber toughening agent in a mass ratio of (4-7):(1-3), wherein the epoxy resin comprises at least one of naphthalene-type epoxy resin and bridged ring-type epoxy resin, and the rubber toughening agent comprises at least one of nitrile rubber, polyurethane rubber, chloroprene rubber, and silicone rubber.

[0119] Preferably, the epoxy resin comprises a naphthalene-type epoxy resin and a bridged ring-type epoxy resin in a mass ratio of (5-8):(3-6);

[0120] C. Fiber repair layer 3, comprising chopped fibers with a non-circular cross-section, a diameter of 2-15 μm, and a length of less than 5 mm, wherein the chopped fibers include at least one of carbon fiber and polypropylene fiber. Optionally, the chopped fibers have an elliptical cross-section, a polygonal cross-section, or other non-circular cross-section. The chopped fibers can be commercially available products or can be prepared in-house. Taking elliptical cross-section chopped polypropylene fiber as an example, polypropylene fiber is extruded through a customized spinneret, rolled into an elliptical cross-section by a twin-roll calender, and then cut to a fixed length, for example, 3-5 mm, to obtain chopped polypropylene fiber;

[0121] Functional materials, by weight, may include, but are not limited to:

[0122] 3-7 parts polyacrylate

[0123] 4-7 parts calcium carbonate

[0124] 3-6 parts of active titanium dioxide

[0125] 5-20 doses of self-repairing microcapsules;

[0126] Optional (5) Auxiliary materials, 1-5 parts, including at least one of water-reducing agent, defoamer, and coagulant aid;

[0127] The water-reducing agent includes at least one of HM type water-reducing agent, MY type water-reducing agent or NF high-efficiency water-reducing agent;

[0128] The defoamer includes at least one of emulsified silicone oil or polydimethylsiloxane;

[0129] The coagulant includes bauxite, sodium carbonate and quicklime, with a mass ratio of (5-7):(2-4):(1-3).

[0130] The preparation method of the aforementioned high-durability airport pavement quick repair composition includes the following steps:

[0131] S1. Preparation of self-healing microcapsules:

[0132] Step 1: Preparation of Repair Core Layer 1 by Mixing and Granulating

[0133] Volcanic ash, fly ash, and nano-SiO2 are placed in a high-efficiency mixer (such as a V-type mixer or a three-dimensional motion mixer), dry-mixed for 15-30 minutes, and then an appropriate amount of deionized water is added for emulsification and granulation. The water-to-solid ratio is controlled at 1:(5-10). After drying and sieving, a repair core with a particle size of 0.3-3mm is obtained.

[0134] Step 2: Prepare the pre-cured resin layer to encapsulate the repair core layer 1:

[0135] Epoxy resin, rubber toughening agent, diluent, photoinitiator and optional additives are mixed evenly and vacuum stirred until no air bubbles are present to form the outer shell coating material;

[0136] The outer shell coating material is applied and wrapped around the repair core layer (e.g., by a fluidized bed coating machine or a high-efficiency coating pan), and pre-cured by UV light to form a pre-cured resin layer with a pre-curing degree of less than 40%.

[0137] Step 3: Preparation of resin shell layer 2 and fiber repair layer 3:

[0138] After surface activation treatment, the chopped fibers are dispersed onto the surface of the pre-cured resin layer and cured to obtain a fiber repair layer 3 that adheres to the surface of the resin shell layer 2; the surface activation treatment is selected from at least one of corona discharge treatment, plasma treatment, and ozone treatment.

[0139] Optional corona discharge treatment conditions: O2 / N2 mixed gas (volume ratio 3:7) or NH3 / N2 mixed gas (volume ratio 2:8), voltage 5-15kV, frequency 10-20kHz, duty cycle 15-50%, treatment 3-30s.

[0140] Plasma treatment conditions: At room temperature (10-50 Pa), in air or O2 / Ar mixed gas, at a power of 30-80W for 1-5 minutes.

[0141] Ozone treatment method: Short-cut carbon fibers are placed in an ozone generator, and the ozone gas flow rate is controlled from 0.1L / min to 1.0L / min and the pressure is controlled from 0.01MPa to 0.10MPa to ozonate the carbon fibers for 1-10 hours.

[0142] S2. Surface-activate PVA fibers and cellulose fibers; then premix the surface-activated cellulose fibers with polyacrylate to form pre-coated fibers; wherein, the PVA fibers include three-stage modification:

[0143] First stage: The PVA fiber surface is subjected to corona treatment or plasma treatment to obtain surface-activated PVA fiber;

[0144] Second stage: The surface-activated PVA fibers are modified by an aminosilane coupling agent to obtain amino-modified PVA fibers.

[0145] Third stage: The amino-modified PVA fibers are further grafted with single-end epoxy polyether.

[0146] S3. Dry mix cementitious materials and aggregates for 5-15 minutes, add an appropriate amount of water, and stir for 5-15 minutes to form a uniform paste.

[0147] S4. Add the pre-coated fiber, activated PVA fiber and self-healing microcapsule to the slurry and stir at low speed for 5-10 minutes.

[0148] S5. Add calcium carbonate, active titanium dioxide and an appropriate amount of water, stir and mix for 5-10 minutes to obtain a high-durability airport pavement quick repair composition.

[0149] Optionally, in step S5, the water is micro-nano bubble water, which includes water, gas and bubble stabilizer. The gas component is ozone and air in a volume ratio of (1-1.5):1. The bubble stabilizer is an anionic surfactant selected from at least one of sodium dodecyl sulfate or sodium dioctyl sulfosuccinate, with an addition amount of 0.01-0.05 wt%.

[0150] A method for rapid repair of high-durability airport pavement is provided using the aforementioned rapid repair composition or the rapid repair composition obtained by the aforementioned preparation method, comprising the following steps:

[0151] S1. Grind, clean and dry the pavement to be repaired, and spray a silane coupling agent solution. The mass ratio of silane coupling agent, acetic acid, water and alcohol in the silane coupling agent solution is (1-5):(1-5):(1-5):(85-97). The silane coupling agent is selected from one or a mixture of several of KH550, KH560, KH570 or Nanda 42.

[0152] S2. Apply an interface repair slurry, which includes acrylic resins and / or polyurethane resins, and optionally an interface toughening agent, and pre-cures to form a continuous interface layer. Preferably, UV light is used for pre-curing, and the degree of pre-curing is controlled at 50-80%.

[0153] The interface toughening agent is selected from at least one of carboxyl-terminated nitrile butadiene rubber and chloroprene rubber, preferably at least carboxyl-terminated nitrile butadiene rubber, accounting for 5-25% of the total mass of the interface repair slurry.

[0154] Preferably, in the interface repair slurry, the mass ratio of polyurethane acrylate, epoxy acrylate and carboxyl-terminated nitrile rubber is (5-8):(1-3):(1-2).

[0155] S3. Lay the quick-repair composition and compact and level it;

[0156] S4. Allow the quick-repair composition to set and dry naturally to form a highly durable airport pavement.

[0157] Preparation Example 1

[0158] The preparation of self-healing microcapsules specifically includes the following steps:

[0159] Step 1: Preparation of the repair core layer by mixing and granulation:

[0160] Weigh out 8 parts by weight of volcanic ash (passed through a 200-mesh sieve), 5 parts by weight of fly ash (Grade I ash), and 5 parts by weight of nano-SiO2 powder (particle size ≤50nm). Place them in a high-efficiency mixer and dry mix continuously for 30 minutes until all components are fully dispersed and uniform. Under continuous stirring, slowly add deionized water to the uniformly mixed dry powder for emulsification and granulation, controlling the water-to-solid ratio at 1:7.5. Transfer the wet material to an extrusion spheronizing granulator to prepare wet granules. Spread the wet granules evenly on a stainless steel tray and place them in a forced-air drying oven. Dry them at 80±5℃ for 5 hours until the moisture content of the granules is less than 1wt%. The dried granules need to be sieved sequentially through a 10-mesh (approximately 2.0mm aperture) and a 40-mesh (approximately 0.45mm aperture) standard sieve. Collect granules with a particle size between 0.45mm and 2.0mm for use as the repair core layer.

[0161] Step 2: Under light-protected conditions, add 100 parts by weight of E-51 bisphenol A epoxy resin, 20 parts by weight of CR244 chloroprene rubber (CR), 15 parts by weight of butyl glycidyl ether, 3 parts by weight of triaryl thioonium salt, 0.5 parts by weight of defoamer BYK-066N, and 0.5 parts by weight of leveling agent BYK-354 to the reactor or planetary mixer. Start stirring and gradually increase the speed to approximately 600 rpm, while simultaneously turning on the vacuum system and maintaining a vacuum level above -0.095 MPa. Continue stirring for 40 minutes until the mixture is uniform, transparent, and free of visible bubbles. Subsequently, place the repaired core layer particles prepared in Step 1 into a fluidized bed coating machine and preheat to 45°C. The equipment is started to tumble the core particles. The prepared outer coating material is then evenly sprayed onto the surface of the core particles using a spray gun. The spraying rate and spray gun distance are controlled to ensure uniform coating thickness. The final dry weight of the coating layer is approximately 25% of the dry weight of the repaired core layer. Immediately after coating, the particles are transferred to a UV curing chamber equipped with a 365nm UV LED light source (150±15mW / cm²) for irradiation. Real-time Fourier transform infrared spectroscopy (FTIR) is used to monitor the characteristic peaks of the epoxy groups (~915 cm⁻¹). -1 The irradiation is stopped when the attenuation rate reaches 20%, that is, the pre-curing degree is 20%, to form particles wrapped in a pre-cured resin layer with moderate surface adhesion and maintaining shape stability.

[0162] Step 3: Preparation of the resin shell and fiber repair layer:

[0163] The particles with a pre-cured resin layer, treated in step two, are placed in a vibratory dish. Short-cut carbon fibers, approximately 3±0.3 mm in length and 10 μm in diameter, are uniformly and dispersedly sprayed and settled onto the pre-cured resin layer particles, which still have a certain degree of adhesion, under the action of compressed air. The mass of carbon fibers in the fiber repair layer accounts for approximately 6% of the total dry weight of the particles. After the fibers are attached, the particles are transferred to a curing oven and post-cured at 80±5℃ for 2 hours to allow the pre-cured resin layer to completely cure and form the final dense resin shell layer. The final result is a composite repair particle with a structure of "repair core layer - resin shell layer - fiber repair layer", with a mass ratio of approximately 100:25:7.5.

[0164] Preparation Example 2

[0165] A bridged epoxy resin, EP-4088L, was obtained by polymerizing dicyclopentadiene dimethanol diglycidyl ether (Formula III), with an epoxy equivalent of approximately 165, to replace the E-51 bisphenol A type epoxy resin in Preparation Example 1.

[0166] Preparation Example 3

[0167] A naphthalene-type epoxy resin, Epiclon HP-4032D (epoxy equivalent of about 140), obtained from 1,6-bis(2,3-epoxypropane-1-yloxy)naphthalene monomer (Formula I), was used to replace the E-51 bisphenol A type epoxy resin in Preparation Example 1.

[0168] Preparation Example 4

[0169] A compound of 30 parts by weight of bridged ring epoxy resin (same as in Preparation Example 2) and 70 parts by weight of naphthalene-type epoxy resin (same as in Preparation Example 3) was used to replace the E-51 bisphenol A type epoxy resin in Preparation Example 1.

[0170] Preparation Example 5

[0171] Compared to Preparation Example 4, short-cut carbon fibers with an elliptical cross-section were used, with a length of approximately 3 ± 0.3 mm and a diameter of 2-15 μm.

[0172] Preparation Example 6

[0173] Compared to Preparation Example 5, the chopped carbon fibers were subjected to plasma activation treatment under the following conditions: room temperature, 25±2 Pa, O2 / Ar mixed gas, power 50W, and treatment time 2 min.

[0174] Preparation Example 7

[0175] Compared to Preparation Example 6, the rubber toughening agent was a compound of 12 parts by weight of CR244 type chloroprene rubber (CR) and 8 parts by weight of carboxyl-terminated butadiene-acrylonitrile rubber (CTBN) 1300X13.

[0176] Preparation Example 8

[0177] Compared to Preparation Example 7, the mass ratio of the repair core layer, resin shell layer, and fiber repair layer is approximately 100:15:10.

[0178] Preparation Example 9

[0179] Compared to Preparation Example 7, the mass ratio of the repair core layer, resin shell layer, and fiber repair layer is approximately 100:35:5.

[0180] Preparation examples 1-9 are shown in Table 1:

[0181] Table 1

[0182]

[0183] Examples 1-9

[0184] High-durability airport pavement quick-repair composition samples were prepared using the following parts by weight of raw materials, wherein Examples 1-9 respectively used the self-healing microcapsules prepared in Examples 1-9:

[0185] 52 parts of silicate cement PII52.5

[0186] 23 parts of sulfoaluminate cement

[0187] 16 parts of fluoroaluminate rapid-hardening cement

[0188] 14 parts of silicate cement with early strength;

[0189] 7.5 parts PVA fiber

[0190] 7.5 parts cellulose fiber;

[0191] 15 parts fine sand

[0192] 90 parts coarse aggregate;

[0193] 5 parts polyacrylate

[0194] 5.5 parts calcium carbonate

[0195] 4.5 parts of active titanium dioxide

[0196] 10 portions of self-healing microcapsules;

[0197] The additives consist of 10 parts, including 1.5 parts water-reducing agent, 1 part defoamer, 1 part coagulant aid, and 6.5 parts expansion agent.

[0198] The above materials are used to prepare a high-durability airport pavement quick repair composition by the following method, the specific steps of which include:

[0199] 1) The self-healing microcapsules prepared in Examples 1-9 were selected;

[0200] 2) PVA fibers and cellulose fibers were plasma activated under the following conditions: room temperature, 25±2 Pa, O2 / Ar mixed gas, power 50W, for 2 min; then the surface-activated cellulose fibers were premixed with polyacrylate to form pre-coated fibers.

[0201] The activated PVA fibers were further modified with an aminosilane coupling agent:

[0202] Mix ethanol and deionized water at a volume ratio of 90:10 until homogeneous, and add a small amount of dilute acetic acid to adjust the pH value to between 4 and 5.

[0203] γ-aminopropyltriethoxysilane (KH550) was slowly added to an alcohol-water solution, and the mixture was stirred to ensure complete hydrolysis of the coupling agent. The amount of KH550 used was 1% of the weight of the PVA fiber.

[0204] The activated PVA fibers were completely immersed in the silane coupling agent solution, stirred appropriately, and soaked for about 1 hour before being removed and centrifuged at low speed to remove excess solution.

[0205] Place the PVA fibers in an oven and dry them at 85°C for 2.5 hours.

[0206] Further grafting modification of the amino-modified PVA fibers with single-ended epoxy polyethers includes:

[0207] 3) Dry mix silicate cement PII, sulfoaluminate cement, fluoroaluminate rapid hardening cement, silicate cement early strength type, fine sand, coarse aggregate and expansion agent for 10 minutes, add appropriate amount of water and setting aid, stir and mix for 10 minutes to form a uniform paste.

[0208] 4) Add the pre-coated fiber, PVA fiber, corresponding self-healing microcapsules and water-reducing agent to the slurry and stir at low speed for 10 minutes;

[0209] 5) Add calcium carbonate, active titanium dioxide, defoamer and appropriate amount of water, stir and mix for 8 minutes to obtain a high-durability airport pavement quick repair composition.

[0210] Examples 10-12

[0211] Examples 10-12 use the same types of materials as Example 7, but differ in the material ratios. The specific material ratios are shown in Table 2.

[0212] Comparative Examples 1-4

[0213] Comparative Examples 1-4 use the same types of materials as Example 7, but differ in the material ratios. The specific material ratios are shown in Table 2.

[0214] Table 2

[0215]

[0216] Comparative Example 5

[0217] Comparative Example 5 refers to Example 12, except that self-healing microcapsules are not used. The materials of the repair core layer, resin shell layer and fiber repair layer corresponding to the self-healing microcapsules are used directly. That is, the repair core material is dry-mixed with cementitious materials in step 3), and the resin material and fiber material are added together with other materials in step 4).

[0218] Comparative Example 6

[0219] Comparative Example 6 refers to Example 12, the difference being that the self-healing microcapsule does not contain a fiber repair layer, but only uses a resin shell to encapsulate the repair core layer.

[0220] Comparative Example 7

[0221] Comparative Example 7 refers to Example 12, except that the PVA fiber and cellulose fiber in the fiber material are added directly in step 4) without activation or other treatment, and the polyacrylate pre-coated with cellulose fiber is added directly in step 5).

[0222] Mechanical properties were tested on the samples of Examples 1-12 and Comparative Examples 1-7, and the test results are shown in Table 3.

[0223] 1) Compressive strength: According to the "Standard for Test Methods of Physical and Mechanical Properties of Concrete" GB / T 50081-2019, cubic samples (150mm×150mm×150mm) were prepared and tested under pressure after curing for 1h, 3h, 1d and 7d. Three samples were set for each test cycle and the average value of the test was taken.

[0224] 2) Flexural strength: According to the "Standard for Test Methods of Physical and Mechanical Properties of Concrete" GB / T 50081-2019, beam-shaped samples (100mm×100mm×400mm) were prepared, and three-point bending tests were conducted after curing for 1h, 3h, 1d and 7d. Three samples were set for each test cycle and the average value of the test was taken.

[0225] Table 3

[0226]

[0227] According to the "Technical Specification for Construction of Cement Concrete Surface Layer of Civil Airports" (MH 5006-2015), cubic samples (150mm×150mm×150mm) were prepared, with 3 samples per group. Abrasion resistance was tested on samples from Examples 1-12 and Comparative Examples 1-7 using an abrasion resistance testing machine. The abrasion resistance test results for Examples 1-12 were all <2.5kg / m².3 Among them, the abrasion resistance test results of Examples 6-8, 11 and 12 are <2.0 kg / m. 3 In the comparative examples, the abrasion resistance test results of Comparative Examples 2 and 4 met the requirement of ≤2.5 kg / m². 3 The remaining control ratios were all higher than 2.5 kg / m 3 .

[0228] Application Example 1

[0229] The high-durability airport pavement quick repair composition prepared in Example 7 is used for airport pavement repair, specifically including the following steps:

[0230] S1. Grind and clean the pavement to be repaired, and then spray a silane coupling agent solution with a mass ratio of 4:3:3:90.

[0231] S2. An interface repair slurry consisting of polyurethane acrylate, epoxy acrylate and carboxyl-terminated butadiene nitrile rubber in a mass ratio of 7:2:1 is coated and pre-cured by UV light to form a continuous interface layer with a pre-curing degree of 65%.

[0232] S3. Lay the quick-repair composition and compact and level it;

[0233] S4. Allow the quick-repair composition to set and dry naturally to form a highly durable airport pavement.

[0234] Application Example 2

[0235] The difference between this application example and application example 1 is that the interface repair slurry is not applied in step S2 of this application example.

[0236] Application Example 3

[0237] The difference between this application example and application example 2 is that in this application example, steps S3 and S4 are performed immediately after the surface to be repaired has been polished, cleaned and dried without using silane coupling agent solution and interface repair slurry.

[0238] The paving areas corresponding to test cases 1-3 were sampled and tested after 28 days of curing. The results are shown in Table 4.

[0239] 1) Freeze-thaw resistance

[0240] According to the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024, rapid freeze-thaw cycles were performed, and the cumulative number of damages caused by freeze-thaw cycles was recorded. For each application example, three samples were taken and the average value was calculated.

[0241] 2) Resistance to chloride ion penetration

[0242] According to the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024, the electrical flux method was used to test the electrical charge passing through the samples after 28 days of curing for 6 hours. Three samples were taken for each application case and the average value was calculated.

[0243] 3) Shrinkage rate

[0244] According to the "Standard for Test Methods of Long-Term Performance and Durability of Concrete" GB / T 50082-2024, samples of 25mm×25mm×285mm were taken and the shrinkage rate was measured in an environment of 20℃ / 60%RH for 28 days. Three samples were taken for each application example and the average value was taken.

[0245] Table 4

[0246]

[0247] As can be seen from the table, Application Examples 1-3 using the quick repair composition of the present invention can all meet the standard requirements of 300 rapid freeze-thaw cycles, an electrical flux value not exceeding 1000 coulombs, and a drying shrinkage rate of less than 0.09%. Application Example 2, which was sprayed with silane coupling agent solution, and Application Example 1, which further used interface repair slurry, have better freeze-thaw resistance. In addition, the deviation of each sample in Application Example 1 is also small, indicating that the overall repair uniformity is good. Furthermore, the sample in Application Example 1 shows better resistance to chloride ion penetration and drying shrinkage rate.

[0248] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Clearly, those skilled in the art can make various alterations and variations to the invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the invention and its equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A high-durability airport pavement rapid repair composition, characterized in that, Based on parts by weight, it includes the following components: 80-130 parts of cementitious materials 90-120 parts of aggregate 10-20 parts of fiber material 15-40 parts of functional materials; Fiber materials include PVA fibers and cellulose fibers; Functional materials include polyacrylate, calcium carbonate, active titanium dioxide, and self-healing microcapsules; The self-healing microcapsules, accounting for 15-60% of the total mass of the functional materials and not exceeding 10% of the total mass of the rapid repair composition, include a repair core layer, a resin shell layer, and a fiber repair layer adhered to the surface of the resin shell layer. The resin shell layer includes a toughening resin composition. The repair core layer includes volcanic ash, fly ash, and nano-SiO2. The toughening resin composition includes epoxy resin and a rubber toughening agent. The fiber repair layer includes short-cut fibers with a non-circular cross-section. The cementitious materials include silicate cement PII52.5, sulfoaluminate cement, fluoroaluminate rapid-hardening cement, and silicate cement with early strength. The aggregates include fine sand and coarse aggregates; The PVA fibers and cellulose fibers undergo surface activation treatment, which includes corona treatment or plasma treatment. The PVA fibers after surface activation treatment are then modified with an aminosilane coupling agent to obtain amino-modified PVA fibers. The cellulose fibers after surface activation treatment are premixed with the polyacrylate to form pre-coated cellulose fibers.

2. The quick repair composition as described in claim 1, characterized in that, The cementitious material comprises, by weight, the following: Portland cement PII52.5, 44-60 parts 16-30 parts of sulfoaluminate cement 12-20 parts of fluoroaluminate rapid-hardening cement 8-20 parts of silicate cement with early strength; The aggregate includes: 10-20 parts fine sand 80-100 parts coarse aggregate; The fiber material includes: 5-10 parts of PVA fiber 5-10 parts of cellulose fiber.

3. The quick repair composition as described in claim 1 or 2, characterized in that, In the self-healing microcapsule, the mass ratio of the repair core layer, resin shell layer and fiber repair layer is 100:(10-40):(3-10).

4. The quick repair composition as described in claim 3, characterized in that, In the repair core layer, volcanic ash, fly ash and nano-SiO2 are mixed in a mass ratio of (6-9):(4-6):(4-7); In the toughening resin composition, the mass ratio of epoxy resin to rubber toughening agent is (4-7):(1-3), wherein the epoxy resin includes at least one of naphthalene-type epoxy resin and bridged ring-type epoxy resin, and the rubber toughening agent includes at least one of nitrile rubber, polyurethane rubber, chloroprene rubber, and silicone rubber. In the fiber repair layer, the chopped fibers with a non-circular cross-section have a diameter of 2-15 μm and a length of less than 5 mm. The chopped fibers include at least one of carbon fiber and polypropylene fiber.

5. The quick repair composition as described in claim 4, characterized in that, The epoxy resin includes naphthalene-type epoxy resin and bridged ring-type epoxy resin in a mass ratio of (5-8):(3-6); The rubber toughening agent includes carboxyl-terminated butadiene-acrylonitrile rubber and chloroprene rubber in a mass ratio of (6-9):(1-4).

6. The quick repair composition as described in claim 5, characterized in that, Self-healing microcapsules are prepared through the following steps: Step 1: Preparation of the repair core layer by mixing and granulation: Mix the core repair material with an appropriate amount of deionized water, emulsify and granulate, then dry and sieve. Step 2: Prepare the pre-cured resin layer to encapsulate the repair core: The resin shell material is mixed evenly and then vacuum stirred until no air bubbles are present to form the outer shell coating material. The outer casing material is applied to the surface of the repair core layer and pre-cured to form a pre-cured resin layer covering the repair core layer; Step 3: Preparation of the resin shell and fiber repair layer: Short fibers are dispersed onto the surface of a pre-cured resin layer, and the resin layer is cured to obtain a fiber repair layer that adheres to the surface of the resin shell layer.

7. The quick repair composition as described in claim 6, characterized in that, The preparation of self-healing microcapsules meets at least one of the following criteria: In step one, the particle size of the repaired core layer is 0.3-3 mm; In step two, the pre-curing degree is below 40%; In step three, before being dispersed onto the surface of the pre-cured resin layer, the chopped fibers undergo a surface activation treatment, wherein the surface activation treatment is selected from at least one of corona discharge treatment, plasma treatment, and ozone treatment.

8. A method for preparing a high-durability airport pavement quick-repair composition as described in any one of claims 1-7, characterized in that, Includes the following steps: 1) Preparation of self-healing microcapsules; 2) Surface-activate PVA fibers and cellulose fibers; then premix the surface-activated cellulose fibers with polyacrylate to form pre-coated fibers; 3) After the cementitious materials and aggregates are dry-mixed evenly, add an appropriate amount of water and stir to form a uniform paste; 4) Add the pre-coated fiber, PVA fiber and self-healing microcapsule to the slurry and stir at low speed until homogeneous; 5) Add calcium carbonate, active titanium dioxide and an appropriate amount of water, stir and mix to obtain a high-durability airport pavement quick repair composition.

9. A method for rapid repair of high-durability airport pavement, characterized in that, The quick repair composition according to any one of claims 1-7 or the quick repair composition obtained by the preparation method according to claim 8 comprises the following steps: S1. Grind and clean the pavement to be repaired, then spray with silane coupling agent solution. S2. Apply an interface repair slurry containing acrylate resin and / or polyurethane resin, and pre-cure to form a continuous interface layer; S3. Lay the quick-repair composition and compact and level it; S4. Allow the quick-repair composition to set and dry naturally to form a highly durable airport pavement.

10. The rapid repair method as described in claim 9, characterized in that, In step S2, the interface repair slurry is a compound containing polyurethane acrylate, epoxy acrylate and interface toughening agent; the interface toughening agent is selected from at least one of carboxyl-terminated nitrile rubber and chloroprene rubber, accounting for 5-25% of the total mass of the interface repair slurry.

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