Preparation method and application of rapid pavement repairing material

Abstract

The invention relates to the technical field of special low-carbon cementing materials and high-leakage structure construction and pavement repair thereof, and discloses a preparation method and application of a rapid pavement repair material. Carrying out dry mixing on the aggregate and a first part of gelling powder containing amorphous aluminosilicate micro powder with a specific modulus to construct an ion pre-saturated layer; preparing modified slurry containing ion-sensitive cellulose ether and fatty acid salt; enabling the modified slurry to form a uniform coating on the surface of the pre-coated aggregate by utilizing shearing force; when the material is filled into the pit slot and stands, local salting-out is induced by utilizing ion concentration gradient, an instantaneous viscosity peak is generated to directionally anchor the slurry to an aggregate contact part, and communicated pores are kept. Microcosmic migration of the slurry in the initial stage of polymerization is inhibited through an interface directional pinning mechanism, so that pore blockage caused by capillary stress is effectively avoided, and the stability of the slurry is improved. And it is guaranteed that the repairing layer has excellent infiltration capacity and interface bonding strength at the same time.

Description

Technical Field

[0001] This invention relates to a method for preparing and applying a rapid road repair material, belonging to the field of special low-carbon cementitious materials and their high-permeability structure construction and road repair technology. Background Technology

[0002] Currently, in municipal maintenance projects, permeable pavements are constructed by building a skeleton interlocking structure, using cementitious materials to coat the aggregate surface to form a system that combines strength and interconnected pores. Due to the high carbon emissions of traditional silicate cement production, alkali-activated materials, which have green and environmentally friendly properties, have the characteristics of early high strength and low carbon footprint, making them the mainstream solution for special low-carbon pavement repair. The hardening process of alkali-activated materials involves the depolymerization and condensation of precursors in a strong alkaline environment, generating an inorganic polymer network with bonding strength. To ensure the wetting of the interface between the repair layer and the old pavement and the aggregate surface, the slurry maintains its initial fluidity. However, during the pre-hardening window period, the slurry is driven by gravity and capillary forces, and is prone to microscopic migration to the throat area generated by aggregate accumulation. Uncontrolled migration causes the cementitious materials to accumulate in the pore gaps, forming physical blockages, resulting in a failure state where the repair area is permeable on the surface but dense inside.

[0003] Existing technological improvements often focus on optimizing physical components or enhancing bulk mechanics, lacking precise control over the behavior of the slurry in its initial flow state. For example, Chinese invention patent CN105712669B discloses a geopolymer-fiber road surface repair material and its preparation method. Although it improves the brittleness and low flexural strength of geopolymers by incorporating PVA fibers, falling under the category of improving the bulk properties after hardening, in actual repair conditions, there is a lack of intervention in the initial movement state of the slurry. Even with the addition of reinforcing fibers, the slurry still flows into the depths of pores due to the lack of interfacial anchoring mechanisms. This lack of spatial selectivity in slurry sedimentation... The reduction in viscosity leads to a decrease in the internal permeability coefficient of the repair layer. As the slurry is lost at the bonding interface, stress concentration occurs at the junction of the new and old materials, which can induce peeling and detachment under environmental erosion and heavy vehicle impact. Increasing the overall viscosity to inhibit seepage results in uneven thickness of the slurry coating the aggregate, and weakens the mechanical interlocking force between the slurry and the old pavement interface, causing edge peeling under high-frequency heavy load conditions. The alkali-activated system, accompanied by chemical exothermic changes, alters the surface tension of the slurry, exacerbating capillary action and causing the slurry to spontaneously migrate into micro-cracks, resulting in a reduction in the bonding area. Currently, the industry adjusts this by reducing water consumption or adding physical thickeners, but it is difficult to balance repair strength and permeability rate stability.

[0004] Therefore, the technical problem to be solved by this invention is how to achieve directional pinning of slurry at the aggregate contact point while maintaining high permeability and porosity, constructing a reinforced interface with chemical fusion characteristics, and improving the material's adaptability to complex engineering environments. Summary of the Invention

[0005] To address the problems mentioned in the background art, the technical solution of the present invention is as follows: A method for preparing a rapid road repair material, comprising the following steps: Step S101: Provide the road surface to be repaired, and spray the pothole interface of the road surface to be repaired with an alkaline activating liquid containing a wetting agent to activate the silicon and aluminum components of the pothole interface. Step S102: Provide aggregate and alkali-activated gelling powder, which will account for the total mass of the alkali-activated gelling powder. to The first part of the alkali-activated gelling powder is mixed and dry-mixed with the aggregate to form an ion pre-saturated layer on the surface of the aggregate, thus obtaining pre-coated aggregate; Step S103: Mix the remaining amount of the alkali-activated gel powder with an activator solution containing a thixotropic modifier and prepare a modified slurry. The thixotropic modifier includes ion-sensitive cellulose ethers and fatty acid salts. Step S104: Mix and stir the pre-coated aggregate with the modified slurry to reduce the viscosity of the modified slurry and form a uniform coating on the surface of the pre-coated aggregate. In step S105, the mixed material is filled into the pit and left to stand. The ion concentration gradient generated by the contact between the ion presaturated layer and the modified slurry induces the ion-sensitive cellulose ether to produce local salting at the interface of the aggregate, thereby generating an instantaneous viscosity peak. The modified slurry is then oriented and anchored to the contact area between the aggregates using this instantaneous viscosity peak. The local yield stress formed by the local salting is greater than the shear component of the uniform coating migrating to the throat of the interconnected pores under gravity, thereby maintaining the interconnected pores between the aggregates.

[0006] Preferably, the particle size of the amorphous aluminosilicate micro powder in step S102 is [missing information]. to The amorphous aluminosilicate micro powder is obtained by adjusting the first part of the alkali-activated gelled powder. and The molar ratio allows the ion-presaturated layer to react with the modified slurry after contact. Internally, this allows the concentration of alkali metal ions at the contact interface to reach a saturated state; localized salting out reduces the shear yield stress at the contact interface during static rest. From the inside Increase to above.

[0007] Preferably, the shear yield stress of the modified slurry in a static state. Satisfy the following formula: ,in, The static yield stress of the modified slurry is given by units of 1. ; The density of the modified slurry is expressed in units of... ; Let be the acceleration due to gravity, and take . ; The average thickness of the uniform coating, in units of ; The slope angle of the pothole interface of the road surface to be repaired; the preparation method adjusts the mass percentage of the thixotropic modifier in the modified slurry so that the static yield stress of the modified slurry counteracts the shear force generated by the uniform coating under gravity.

[0008] Preferably, the alkaline activating liquid in step S101 further includes a thermosensitive silane coupling agent; this preparation method utilizes the latent heat of curing released by the polymerization reaction in step S105 to induce a grafting reaction of the thermosensitive silane coupling agent at the interface of the potholes in the road surface to be repaired, so as to construct a covalent bond structure at the interface between the potholes in the road surface to be repaired and the rapid road repair material; the peak temperature of the latent heat of curing is .

[0009] Preferably, the modified slurry in step S103 further includes a hydrophobic regulator, which includes a perfluoroalkyl phosphate salt; the preparation method utilizes the static recovery process in step S105 to allow the hydrophobic regulator to migrate to the slurry surface, so as to form a low surface energy protective layer with hydrophobic properties on the wall of the hardened interconnected pores.

[0010] Preferably, the first part of the alkali-activated gelling powder in step S102 includes particles with a particle size of to The preparation method utilizes the ultrafine activated alumina powder to absorb residual moisture on the surface of the aggregate and undergo a pre-hydration reaction to form an interfacial bonding layer on the surface of the aggregate to enhance the adhesion of the modified slurry.

[0011] Preferably, the first portion of the alkali-activated gelling powder further includes a microencapsulated self-heating agent, which comprises anhydrous calcium salt particles coated with a paraffin layer. The preparation method utilizes the stirring environment in step S104 to break the paraffin layer, triggering an exothermic hydration reaction between the anhydrous calcium salt particles and the activator solution, thereby compensating for the internal temperature of the modified slurry. The above describes the active range of the base-activated reaction.

[0012] Preferably, the modified slurry in step S103 further includes alkali-resistant basalt fibers with a surface coated with a nucleation precursor; the preparation method utilizes the nucleation precursor to induce the product to grow along the axial direction of the alkali-resistant basalt fiber in the polymerization reaction, so as to construct a reinforcing network in the uniform coating at the contact area between the aggregates.

[0013] Preferably, the following quality assessment steps are also included: Step S901, obtaining the cooling rate curve of the rapid road repair material during the polymerization reaction process in Step S105; Step S902, using the slope of the cooling rate curve to characterize the convective heat dissipation characteristics of the internal pores of the rapid road repair material; Step S903, comparing the convective heat dissipation characteristics with a preset connectivity model to determine whether the connectivity porosity of the rapid road repair material meets the standard, wherein the alkali-activated gelling powder includes blast furnace slag powder and steel slag powder; after the rapid road repair material hardens, in The compressive strength inside is not less than The permeability coefficient is not lower than .

[0014] An application of a rapid road repair material, which is prepared by a rapid road repair material preparation method and applied to the rapid repair of road potholes.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In the preparation of rapid road repair materials, the first part of alkali-activated gel powder is pre-coated on the surface of aggregate to construct an interfacial ion pre-saturated layer. The modified slurry is used to contact this area to induce the local salting-out behavior of ion-sensitive cellulose ether, which increases the instantaneous shear yield stress at the interface. The slurry is directionally pinned to the contact area between aggregates, which counteracts the tendency of the slurry to migrate into the pore space due to capillary stress in the early stage of slurry polymerization, maintains the connectivity of the skeleton structure, and eliminates the risk of slurry blocking the penetration path.

[0016] 2. Alkali-resistant basalt fibers pre-coated with nucleation precursors are used to induce alkali-activated products to preferentially grow along the fiber axis, constructing a reinforcing network within the coating at the aggregate contact point. This transforms the microstructure of the repair layer from a single-phase brittle gel connection to a fiber-anchored composite system, improving the energy dissipation capacity of the repair area under heavy vehicle impact, delaying the accumulation of fatigue damage caused by micro-vibrations, and ensuring the mechanical stability of the interface between the repair block and the original road surface. Ultrafine activated alumina powder with a particle size of 5μm to 15μm is used to absorb residual water film on the aggregate surface and undergo a pre-hydration reaction to generate a viscous aluminum alkoxide complex film. This transforms interfacial moisture from a dilution interference factor into an interfacial thickening driving force, providing adsorption sites for the modified slurry and enhancing the film thickness of the slurry under humid conditions. This ensures that the physical morphology of the pore structure does not become unstable and collapse in the post-rain emergency repair environment.

[0017] 3. By breaking the surface coating of the self-generating heat agent in a high-shear stirring environment, the core components are triggered to undergo an exothermic hydration reaction with the alkaline activation solution. The release of local latent heat directly compensates for the temperature of the slurry microenvironment, keeping the alkaline-activated polymerization chains within the active reaction range. This achieves in-situ thermal activation at low temperatures, shortens the hardening induction period after the thixotropic recovery of the slurry, and prevents seepage caused by hysteresis due to low temperatures. The cooling rate curve of the repair structure during the polymerization reaction is obtained, and the slope of the curve is used to characterize the convective heat dissipation characteristics of the pores inside the repair layer, enabling online self-assessment of the interconnected porosity. By utilizing the byproducts of the hydration latent heat reaction, a closed-loop quality feedback mechanism for the repair process is constructed, providing a basis for real-time determination of whether the permeability performance meets the standards at the construction site. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the preparation process of the rapid road repair material based on interface activation and rheological reconstruction of the present invention. Figure 2 This is a comparative analysis of the thermal compensation effect of the self-generating heat agent on the slurry under different ambient temperatures according to the present invention; Figure 3 This is a schematic diagram of the road surface rapid repair implementation system architecture that integrates closed-loop quality monitoring according to the present invention. Detailed Implementation

[0019] The following disclosure is intended to provide a detailed description of the embodiments of the present invention, to explain and illustrate the technical solutions of the present invention, and is not intended to limit the scope of protection of the present invention. The technical features described in the following embodiments can be combined in any way without conflict.

[0020] This invention provides a method for preparing and applying a rapid road repair material, comprising five stages: interfacial activity pretreatment, aggregate activity coating, modified slurry preparation, dynamic coating, and static directional anchoring hardening. By pre-constructing an ion-presaturated layer on the aggregate surface, the ion concentration gradient generated at the slurry contact interface induces localized salting-out, directionally anchoring the slurry to the aggregate contact area. Addressing the technical problems of weak mechanical interlocking force and insufficient activity at the interface of potholes in old road surfaces, this method performs the following steps... The interface activity pretreatment procedure shown describes providing the road surface to be repaired and spraying the pothole interface with an alkaline activating solution containing a wetting agent to activate the silica-alumina components at the pothole interface. The alkaline activating solution contains [amount]% by mass. to Sodium hydroxide solution and mass percentage to The anionic surfactant, along with a thermosensitive silane coupling agent added to the alkaline activation solution, utilizes the latent heat of curing released from the subsequent alkaline-activated polymerization reaction to drive the alkoxy group of the thermosensitive silane coupling agent to condense with the silanol group at the interface of the old pavement. Simultaneously, the other functional group of this monomer covalently bonds with the aluminosilicate network in the new slurry. This reaction is triggered by the latent heat of curing, with a peak temperature range of [temperature range missing]. to Between these processes, the procedure transforms the physical adhesion at the boundary between new and old materials into chemical bonding, eliminating microcracks at the edges caused by shrinkage stress; to ensure the rapid repair material for this pavement... The compressive strength inside is not less than The blast furnace slag powder and steel slag powder in its alkali-activated gelled powder serve as aluminosilicate precursors, with a mass percentage of [missing information]. to In the strongly alkaline environment provided by sodium hydroxide solution, depolymerization occurs, releasing silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons. These units then undergo condensation polymerization to construct a three-dimensional aluminosilicate polymer network. This polymerization process is accompanied by significant exothermic chemical reaction, and the released latent heat of curing maintains the system temperature at [temperature missing]. to Within the specified range, the thermosensitive silane coupling agent at the pit interface undergoes a grafting reaction, resulting in cross-interface chemical bonding between the old and new materials.

[0021] To address the problem of grout clogging permeable pores due to gravity infiltration, this method involves the following steps: The aggregate active coating procedure shown provides aggregate and alkali-activated gelling powder, which will account for the total mass of the alkali-activated gelling powder. to The first part of the alkali-activated gelling powder is mixed and dry-blended with the aggregate to form an ion-presaturated layer on the surface of the aggregate, resulting in pre-coated aggregate. The first part of the alkali-activated gelling powder contains particles with a particle size of [missing information]. to Amorphous aluminosilicate micro powder, the amorphous aluminosilicate micro powder is obtained by adjusting the first part of the alkali-activated gel powder. and The molar ratio allows the ion-presaturated layer to react with the modified slurry after contact. Inside, the concentration of alkali metal ions at the contact interface reaches a saturated state. When a residual water film exists in the construction environment, the first part of the alkali-activated gelling powder also contains ultrafine active alumina powder of the same particle size range, which is used to absorb moisture from the aggregate surface and undergo a pre-hydration reaction to generate a viscous aluminum alkoxide complex film, providing enhanced adsorption sites for subsequent slurry; Step amorphous aluminosilicate micro powder according to and The molar ratio controls the release rate of alkali metal ions; the molar ratio is set to... to When the powder comes into contact with the modified slurry The release of sodium ions causes the ionic strength at the aggregate contact interface to exceed the salting-out threshold. If the measured concentration of alkali metal ions at the interface is within... Inside lower than ,according to The step size is increased to adjust the molar ratio to satisfy the shear yield stress at the contact interface under static conditions. From the inside Upgraded to In the first part, the alkali-activated gelling powder is physically adsorbed and anchored to the microcracks on the aggregate surface during the dry mixing process, forming a thickness of [missing information]. to The ion presaturation layer, as a source of chemical potential energy, spatially defines the area where local salting-out reactions occur, thereby achieving directional anchoring of the modified slurry at the aggregate contact point.

[0022] Execution steps of this method The rheological reconstruction procedure for the slurry shown involves mixing the remaining alkali-activated gelling powder with an activator solution containing a thixotropic modifier to prepare a modified slurry with high yield stress. The thixotropic modifier includes ion-sensitive cellulose ethers and fatty acid salts, with a mass percentage of [missing information] in the modified slurry. to The modified slurry also contains a hydrophobic modifier composed of perfluoroalkyl phosphate salts, and the shear yield stress of the modified slurry in the static state is... Satisfying the formula: ,in, The static yield stress of the modified slurry is given by units of 1. ; The density of the modified slurry is expressed in units of... ; Let be the acceleration due to gravity, and take . ; The average thickness of the uniform coating, in units of ; To determine the slope angle of the pothole interface on the road surface to be repaired, this method adjusts the content of the thixotropic modifier to give the modified slurry extremely high static yield stress, thus offsetting the shear component of the slurry under gravity. The degree of methoxy substitution of ion-sensitive hydroxypropyl methylcellulose is... to The degree of hydroxypropyl substitution is to When the alkali metal ion molar concentration reaches At the threshold point, molecular chains undergo desolvation, shrinkage, and precipitation; the viscosity transition value of the slurry at this point is not lower than the initial viscosity. By adjusting the compound ratio of the thixotropic modifier, the static shear yield stress of the modified slurry can be increased. The slope angle of the surface of the pothole to be repaired Increase linear lift, slope angle exist to When the range changes, the mass percentage of the thixotropic modifier in the modified slurry is changed from... Incremental adjustment to This counteracts the shear force that causes the uniform coating to migrate toward the throat of the connected pores due to the increase in the gravitational shear component.

[0023] Execution steps of this method The dynamic coating procedure shown involves mixing pre-coated aggregate and modified slurry and then stirring at high speed. The stirring shear force reduces the slurry viscosity, allowing a uniform coating to form on the surface of the pre-coated aggregate. The stirring speed is controlled at [speed value missing]. to In the first part of the alkali-activated gelling powder, under low-temperature conditions, a microencapsulated self-heating agent is added. This agent consists of anhydrous calcium salt particles coated with a paraffin layer. Under the shearing and impact force generated by high-speed stirring, the paraffin layer breaks down, triggering an exothermic hydration reaction between the internal anhydrous calcium salt and the solution, thus compensating for the internal temperature of the modified slurry. In addition, the modified slurry contains alkali-resistant basalt fibers with surface-coated crystal nucleation precursors. These fibers flow with the slurry and cross the aggregate contact zone. This step enables the modified slurry to rapidly wet the aggregate and achieve directional film formation, thus facilitating the process. The precise crushing of microencapsulated self-generating heat agents requires a forced mixer with a mixing energy density of not less than [amount missing]. In this stirring environment, the probability of shear collisions between material particles is adjusted by changing the rotation speed. to Control is implemented within a specified range to ensure that the instantaneous normal pressure acting on the surface of the paraffin layer exceeds its limit. The critical yield strength at the thickness, thus in to During the stirring cycle, the hydration exothermic reaction of the anhydrous calcium salt and activator solution is triggered, raising the internal temperature of the modified slurry to [a certain level]. The above reaction thresholds.

[0024] Execution steps of this method The directional anchoring and hardening procedure shown involves filling the pit with the mixed material. After shearing stops, the viscosity recovery characteristics of the modified slurry are utilized to allow the coating to remain stationary at the aggregate contact point. The ion concentration gradient generated by the contact between the ion-presaturated layer and the modified slurry induces localized salting-out behavior of the ion-sensitive cellulose ether at the aggregate contact interface, producing an instantaneous viscosity peak. This causes the shear yield stress at the contact interface to remain at rest. From the inside Quickly upgrade to The above-mentioned local yield stress is greater than the shear component of the uniform coating migrating to the throat of the interconnected pores under gravity, thereby anchoring the modified slurry to the contact area between the aggregates. During the polymerization reaction, the hydrophobic regulator migrates to the slurry surface, forming a low surface energy protective layer with hydrophobic properties on the hardened interconnected pore wall. The nucleation precursor induces the preferential growth of alkali-activated products along the fiber axis, constructing a reinforcing network at the aggregate contact point. This method also includes an online self-evaluation procedure for permeability. The cooling rate curve of the repair structure during the polymerization reaction is obtained by a sensor. The slope of the cooling rate curve is used to characterize the convective heat dissipation capacity of the pores inside the repair layer. The convective heat dissipation capacity is compared with the preset interconnection model to determine whether the interconnected porosity meets the standard. The alkali-activated gelling powder uses blast furnace slag powder and steel slag powder as active components. It undergoes three-dimensional condensation hardening under the action of strong alkali activation liquid. After the road surface rapid repair material hardens, The compressive strength inside is not less than The permeability coefficient is not lower than .

[0025] Example 1: When the potholes in the road surface to be repaired are located on a slope of... When the road section has a residual water film on the aggregate surface, the operation process of the preparation method of the present invention is as follows: using a mass percentage of The sodium hydroxide solution and its mass percentage are Anionic surfactants were used to prepare an alkaline activating solution, which accounted for a certain percentage of the total mass of the alkaline-activated gelled powder. The first part of the alkali-activated gelling powder is dry-mixed with aggregates. The first part of the alkali-activated gelling powder contains particles with a diameter of [missing information]. and and molar ratio is Amorphous aluminosilicate micro powders are used to construct an ion-presaturated layer on the surface of aggregates, thus obtaining pre-coated aggregates. The remaining amount... Alkali-activated gelling powder and containing a mass percentage of The thixotropic modifier is mixed with an activator solution to prepare a modified slurry. The thixotropic modifier includes ion-sensitive cellulose ethers and fatty acid salts.

[0026] Set the stirring speed to Under the operating conditions, pre-coated aggregates are mixed with modified slurry. The stirring shear force reduces the slurry viscosity, causing it to form a uniform coating on the surface of the pre-coated aggregates. The material is then filled into the pits, and shearing is stopped. The ion concentration gradient generated by the contact between the ion-presaturated layer and the modified slurry induces ion-sensitive cellulose ethers, resulting in localized salting-out behavior at the aggregate interface. This localized salting-out behavior reduces the shear yield stress at the interface during static resting. From the inside Upgraded to Shear yield stress of modified slurry in static state Satisfy the following formula: ,in, The static yield stress of the modified slurry is given by units of 1. ; The density of the modified slurry is expressed in units of... ; Let be the acceleration due to gravity, and take . ; The average thickness of the uniform coating, in units of ; The slope angle of the pothole interface to be repaired is taken in this embodiment. The local yield stress is greater than the shear component that migrates towards the throat of the interconnected pores under gravity in a uniform coating, and the peak temperature released by the slurry polymerization reaction is... The latent heat of curing drives a grafting reaction of the thermosensitive silane coupling agent in the alkaline activating liquid at the interface. After the resulting rapid road repair material hardens, The compressive strength inside is The permeability coefficient is During the static recovery process, the perfluoroalkyl phosphate salts contained in the modified slurry migrate to the slurry surface and form a low surface energy protective layer with hydrophobic properties on the hardened interconnected pore walls. The alkali-resistant basalt fibers with crystal nucleation precursors on the surface of the modified slurry flow with the slurry and cross the aggregate contact area, inducing the polymerization products to grow along the fiber axis and form a reinforcing network at the contact points between the aggregates.

[0027] Example 2: In the verification of the biofilm stability and porosity retention rate of road repair materials at a wet and porous interface, a size of [missing information] was used. The test was conducted on a simulated pit test bench, which features an adjustable slope base to simulate slope angles. for The road conditions, its data acquisition system includes temperature control accuracy of Environmental chamber, pressure resolution is The rheological testing unit and the sampling frequency are The temperature sensor used in this experiment was based on physical experimental data from the aforementioned simulation platform. The testing process simulated fluctuations in an actual industrial setting, introducing a mass percentage of [missing information] onto the aggregate surface. To characterize the effect of moisture interference on residual water film after rain, the determination of the thixotropic modifier mass percentage in the experimental parameter setting procedure involves the determination of the film thickness in the slurry. Trade-offs with permeability coefficient, when the thixotropic modifier content is below At that time, the static yield stress of the slurry Insufficient to offset the gravitational shear component, causing the slurry to migrate towards the throats of interconnected pores and create physical blockage; when the content exceeds... When the upper limit is reached, excessive slurry consistency leads to uneven aggregate coating and reduced initial wettability, thereby weakening the bond between the old and new interfaces. This is particularly problematic for slope conditions. for And slurry density for The working conditions, according to the formula Calculate the critical yield stress and set the thixotropic modifier content as follows: This is to balance coating thickness control and pore connectivity.

[0028] The specific operation process of this experiment follows the steps. to Using a percentage of mass An alkaline activation solution of anionic surfactant was used to activate the interface of the pit to be repaired, and repair materials with different components were prepared. The experiment was divided into the present invention sample group, control group 1, control group 2, and control group 3. Among them, control group 1 did not construct an ion presaturation layer; control group 2 had the thixotropic modifier content set at a certain level. Control group 3 had the thixotropic modifier content set at [value missing]. Each group of materials in Stirring at high speed The simulated potholes were then filled, and the dynamic evolution of the shear yield stress at the contact interface after shearing was stopped was monitored in real time using a rheological testing unit. Table 1 shows the performance comparison data of the rapid road repair material. (Refer to Table 1.) The sample group of this invention was statically tested... Subsequently, the shear yield stress at the contact interface decreased from the initial value. Upgraded to .

[0029] Table 1: Comparison of Performance Test Data for Rapid Road Repair Materials

[0030] By analyzing the data differences in Table 1, control group 1 was found to be missing data. and molar ratio is An ion-presaturated layer constructed from amorphous aluminosilicate microparticles cannot form an effective ion concentration gradient; its yield stress recovers solely through physical thixotropy. The internal amplification is weak, causing the slurry to seep downwards into the pore throat, with a permeability coefficient of... The experimental data from control group 2 showed that when the thixotropic modifier ratio was below the lower limit, the system could not generate sufficient instantaneous viscosity peaks to counteract gravity, resulting in pore blockage and a deterioration in its permeability coefficient. Although control group 3 possessed extremely high yield stress, the excessive amount of thixotropic modifier exceeding the saturation point led to excessive local accumulation of the slurry at the aggregate contact points, compressing the effective flow area of ​​the interconnected pores. The sample group of this invention achieves a synergistic effect of high permeability and early strength through an interface-oriented pinning mechanism. Compressive strength reached The results of this experiment confirm that the chemical potential trap constructed from amorphous aluminosilicate micropowders of a specific modulus induces interfacial directional pinning behavior in the modified slurry. This behavior is further enhanced when the ambient temperature decreases to [a certain value]. At that time, through the shear-triggered mechanism of the microencapsulated self-generating heat agent, the system compensates the internal temperature of the slurry to [a certain value]. The slope characteristics of the cooling rate curve are consistent with the preset connectivity model.

[0031] Example 3: This example combines Figures 1 to 3 A method for preparing and applying a rapid road repair material, such as... Figure 1 As shown, the process flow begins with the supply of external physical raw materials, and its logistics path is divided into three main branches: The first branch delivers alkaline activating liquid to the pothole interface activation stage, obtains the original pothole state data of the external physical road surface to be repaired, and activates the silicon-aluminum components to form an activated silicon-aluminum interface; the second branch delivers aggregate and the first part of the cementitious powder to the ion pre-saturation layer construction stage, forming pre-coated aggregate through dry mixing and coating; the third branch delivers the remaining powder and thixotropic modifier to the modified slurry preparation stage, where rheological properties are reconstructed to meet the formula. The modified slurry is incorporated into the dynamic shear mixing stage with the pre-coated aggregate. This stage simultaneously receives shear rate parameters, including RPM and Temp, from the process parameter library. After mixing, a uniform coating material is formed and output to the directional anchoring and hardening stage. Here, the construction of the interconnected pore structure is completed under the action of the activated silicon-aluminum interface by utilizing the local salting-out and viscosity peak mechanism, and finally the repair is completed and delivered to the external physical road surface to be repaired.

[0032] like Figure 2 As shown, the horizontal axis represents five ambient temperature test points, with values ​​of 4.2. 10 15 20 and 25 The vertical axis represents temperature in units of . The legend is divided into three categories: horizontal stripes represent ambient temperature, vertical stripes represent slurry temperature after using a self-generating heat agent, and diagonal stripes represent slurry temperature without using a self-generating heat agent. Data shows that in a low-temperature environment (4.2...),... Below, the slurry temperature without the use of a self-generating heat agent is close to the ambient temperature, while the slurry temperature after using the self-generating heat agent increases to 18°C. Around 10 degrees Celsius, as the ambient temperature rises to 10 degrees Celsius. 15 and 20 The slurry temperature after using the self-generating agent remained higher than both the ambient temperature and the slurry temperature without the self-generating agent, until the ambient temperature reached 25°C. At that time, the temperatures of the three tend to be the same; such as Figure 3 As shown, the system architecture consists of a raw material supply warehouse, an on-site mixing and preparation platform, an interface activation treatment module, a core repair site, and a quality monitoring feedback terminal. The raw material supply warehouse is responsible for providing aggregates, cementitious powders, and alkaline activating liquids, and transports these materials radially to the on-site mixing and preparation platform via a dotted line. The platform is equipped with a forced mixer and self-heating microcapsules, which, after processing, output modified slurry to be applied to the core repair site (pits). The interface activation treatment module acts independently on the core repair site, utilizing the directional anchoring effect and ion concentration gradient mechanism to ultimately output a repair structure with interconnected pores. Simultaneously, the heat dissipation data generated at the core repair site is transmitted to the quality monitoring feedback terminal. This feedback terminal includes temperature and rheology sensors and a self-evaluation algorithm for real-time monitoring of repair quality, and transmits the signal back to the on-site mixing and preparation platform via the dotted feedback path on the left.

[0033] Example 4: At an ambient temperature of Under the condition of road pothole repair, the mass percentage is used. The sodium hydroxide solution has a mass percentage of An anionic surfactant was used to prepare an alkaline activation solution, which was then sprayed onto the pit substrate. This alkaline activation solution contained a thermosensitive silane coupling agent to construct a covalent bond structure at the interface, providing a particle size of [missing information]. to Basalt aggregate will account for a significant portion of the total mass of alkali-activated cementitious powder. The first part of the alkali-activated gelling powder is mixed with aggregate in a forced mixer. The first part of the alkali-activated gelling powder includes a modulus of... And the median particle size is Amorphous aluminosilicate micro powder, and surface coated with a thickness of Anhydrous calcium salt particles in the paraffin layer, dry-mixed material An active powder film containing self-heating particles is then formed on the aggregate surface; the remaining amount... Alkali-activated gelling powder and containing a mass percentage of The thixotropic modifier and its activator solution were mixed and formulated into a modified slurry. The thixotropic modifier included ion-sensitive cellulose ether and fatty acid salt, wherein the ion-sensitive cellulose ether had an alkali metal ion molar concentration at the contact interface exceeding [a certain value]. Local desolvation occurs when pre-coated aggregate is mixed with modified slurry, and the stirring speed is set to [specified value]. At this rotational speed, the shear force applied by the blades causes mechanical breakage of the paraffin layer, inducing an exothermic reaction between the anhydrous calcium salt and the activator solution, thus compensating for the internal temperature of the slurry from the ambient temperature. To maintain the activity of the base-activated reaction.

[0034] After the material is filled into the pit, the amorphous aluminosilicate micro powder contacts the modified slurry. The internal dissolution and release of alkali metal ions causes the ion concentration at the contact interface to exceed [a certain level]. The salting-out threshold induces localized salting-out of ion-sensitive cellulose ethers, and the resulting instantaneous viscosity peak increases the shear yield stress at the contact interface to [value missing]. This stress counteracts the shear component that migrates the uniform coating towards the throat of the interconnected pores under gravity. After the repaired structure enters the peak of polymerization exothermic activity, its cooling rate curve is obtained, and the absolute value of the cooling slope, i.e., the attenuation constant, is extracted and calculated. The interconnected porosity can be determined using the following formula: ,in, The interconnected porosity of road surface rapid repair materials; This represents the absolute value of the slope of the cooling rate curve, in units of... ; The convective heat transfer sensitivity coefficient is taken as a value under this operating condition. ; Let be the system deviation correction constant, if the calculated... Value not lower than The interconnected porosity of the rapid road repair material was determined to meet the standard. After the rapid road repair material hardened, its... The compressive strength inside is The permeability coefficient is The perfluoroalkyl phosphate salts contained in the modified slurry are oriented towards the interface between the slurry and air and form a low surface energy protective layer. The alkali-resistant basalt fibers with crystal nucleation precursors on the surface of the modified slurry induce alkali-activated products to grow along the fiber axis, constructing a reinforcing network in the uniform coating at the aggregate contact point.

[0035] Example 5: In a pre-engineering calibration scenario for different batches of raw materials, the chemical activity of amorphous aluminosilicate micropowder was calibrated by establishing an ion release benchmark. The batch of amorphous aluminosilicate micropowder to be used was placed at a temperature of And the liquid-to-solid ratio is Stir in water An ion concentration sensor is used to measure the molality of alkali metal ions in the solution. If the measured peak ion intensity is lower than... The threshold will then affect the first part of the alkali-activated gelled powder. and The molar ratio was increased to To improve the dissolution rate and generate the ionic strength gradient required for the local desolvation of ion-sensitive cellulose ethers, the initial moisture content of the aggregate surface is monitored using a moisture analyzer, and the proportion of ultrafine activated alumina powder added is adjusted accordingly. During the pre-coating stage, residual moisture on the aggregate surface is converted in situ into a highly adhesive aluminum alkoxide complex film, maintaining a uniform coating thickness of the modified slurry on the aggregate surface. The constant at that point.

[0036] When the system encounters fluctuations in thermal parameters of the construction environment, a pre-deployment debugging procedure is executed on-site to correct the sensitive constants in the quality assessment model. Under the same heat dissipation environment in the pit, the measured interconnected porosity is prepared. The standard calibration block was used to record the internal cooling curve of the standard calibration block in real time during the polymerization reaction process via an embedded thermocouple. The discrete data of the cooling stage was then subjected to exponential fitting using the Newtonian cooling model to calculate the corresponding decay constant. Through formula Calibrate the convective heat transfer sensitivity coefficient In subsequent actual repair work, the coefficients calibrated on site were used. and formula Determine the interconnected porosity of the repair structure, fill the pit with material and let it stand. Subsequently, the shear yield stress at the contact interface increased to [value missing] under localized salting-out. The above ultimately formed in Internal compressive strength is And the permeability coefficient remains at Repair layer.

[0037] Example 6: In the pre-deployment calibration procedure for a specific graded aggregate, the particle size is measured... to The porosity of the aggregate in the target pit environment is used to establish the average thickness of a uniform coating. The control benchmark was determined by static titration to establish the critical ion concentration threshold for local salting out of ion-sensitive cellulose ethers in the modified slurry. This was achieved by adjusting the modulus of the first part of the alkali-activated gelling powder to... to The mass percentage of amorphous aluminosilicate micro powder was measured, and the alkali metal ion concentration at the aggregate contact interface was recorded. The required time is used to calibrate the shear yield stress at the contact interface during static rest. From the inside Upgraded to The above-mentioned process parameters are required to achieve a specific slope angle. Adjusting the amount of thixotropic modifier added under certain conditions to adjust the static yield stress of the modified slurry. Satisfying the formula: The modified slurry is directionally anchored at the contact points between the aggregates.

[0038] To address the changes in heat dissipation boundaries caused by fluctuations in thermal parameters of the construction environment, a field assessment model parameter correction procedure was executed. Under the same heat transfer environment as the pit to be repaired, a connected porosity of [missing information] was prepared. The standard calibration sample was used to obtain the cooling rate curve of the standard calibration sample during the polymerization reaction, and the absolute value of the cooling slope was extracted. And establish its correlation with the measured porosity. The correlation model between them is determined using experimentally measured data, and the formula is as follows: Convection heat transfer sensitivity coefficient With system deviation correction parameters In subsequent actual repair work, the system uses sensors to collect discrete temperature data during the cooling stage of the polymerization reaction and inputs it into the corrected model. If the calculated... If the value is not lower than the preset standard, the pore connectivity is deemed to meet the standard, and the final driving compressive strength is not lower than And the permeability coefficient is not lower than Non-destructive monitoring of the quality of the repair layer.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a rapid road repair material, characterized in that The method comprises the following steps: Step S101, providing a road surface to be repaired, spraying the interface of a pit and a groove of the road surface to be repaired with an alkaline activator solution containing a wetting agent, so that the silicon-aluminum components of the interface of the pit and the groove are in an activated state; Step S102, providing aggregate and alkali-activated cementitious powder, and mixing the aggregate with a first part of the alkali-activated cementitious powder by dry mixing to build an ion pre-saturation layer on the surface of the aggregate, to obtain pre-coated aggregate. to a first part of the alkali-activated cementitious powder, and mixing the aggregate with the first part of the alkali-activated cementitious powder by dry mixing to build an ion pre-saturation layer on the surface of the aggregate, to obtain pre-coated aggregate. Step S103, mixing the remaining alkaline activator cementing powder with an activator solution containing a thixotropic modifier, and preparing a modified slurry, the thixotropic modifier comprising an ion-sensitive cellulose ether and a fatty acid salt; Step S104, mixing and stirring the pre-coated aggregate with the modified slurry to reduce the viscosity of the modified slurry and form a uniform coating on the surface of the pre-coated aggregate; Step S105, filling the mixed material into the pit and groove and standing, using the ion concentration gradient generated by the contact between the ion pre-saturation layer and the modified slurry to induce local salting-out of the ion-sensitive cellulose ether at the contact interface of the aggregate, to generate a transient viscosity peak, and using the transient viscosity peak to anchor the modified slurry at the contact position between the aggregates, the local yield stress formed by the local salting-out being greater than the shear component of the uniform coating under the action of gravity to migrate to the connected pore throat, so as to maintain the connected pores between the aggregates.

2. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The particle size of the amorphous aluminosilicate micro powder in step S102 is to The amorphous aluminosilicate micro powder is obtained by adjusting the first part of the alkali-activated gelled powder. and The molar ratio allows the ion-presaturated layer to react with the modified slurry after contact. Internally, this allows the concentration of alkali metal ions at the contact interface to reach a saturated state; localized salting out reduces the shear yield stress at the contact interface during static rest. From the inside Increase to above.

3. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. Shear yield stress of modified slurry in static state satisfies the following formula: wherein, is the static yield stress of the modified slurry, in units of Pa; ; is the density of the modified slurry, in units of kg / m3; ; is the acceleration of gravity, taken as 9.8 m / s2; ; is the average thickness of the uniform coating, in units of m; ; is the slope angle of the interface of the pothole to be repaired; the preparation method adjusts the mass percentage of the thixotropic modifier in the modified slurry, so that the static yield stress of the modified slurry offsets the shear force generated by the uniform coating under the action of gravity.

4. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The alkaline activating solution in step S101 also comprises a heat-sensitive silane coupling agent; the preparation method utilizes the latent heat of solidification released by the polymerization reaction in step S105 to induce the heat-sensitive silane coupling agent to undergo a grafting reaction at the interface of the pothole of the road surface to be repaired, so as to construct a covalent bonding structure at the interface of the pothole of the road surface to be repaired and the bonding surface of the rapid repair material for the road surface; the peak temperature of the latent heat of solidification is .

5. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The modified slurry in step S103 further comprises a hydrophobicity regulator, the hydrophobicity regulator comprising a perfluoroalkyl phosphate salt; the preparation method uses the static recovery process in step S105 to make the hydrophobicity regulator migrate to the surface of the slurry, so as to form a low-surface-energy protective layer with hydrophobic properties on the wall of the hardened connected pores.

6. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The first part of the alkali-activated cementitious powder in step S102 includes ultra-fine active alumina powder with a particle size of to The preparation method uses the ultra-fine active alumina powder to absorb residual moisture on the surface of the aggregate and undergo a pre-hydration reaction to form an interfacial bonding layer on the surface of the aggregate for enhancing the adhesion of the modified slurry.

7. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The first part of the alkali-activated cementitious powder further comprises a microencapsulated self-heating agent, which comprises anhydrous calcium salt particles coated with a paraffin layer; the preparation method utilizes the stirring environment in step S104 to break the paraffin layer, triggering the hydration exothermic reaction of the anhydrous calcium salt particles with the activator solution, to compensate the internal temperature of the modified slurry to The above alkali-activated reaction activity range.

8. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The modified slurry in step S103 further comprises alkali-resistant basalt fibers coated with a crystal nucleus precursor on the surface; the preparation method uses the crystal nucleus precursor to induce the growth of the product along the axial direction of the alkali-resistant basalt fibers in the polymerization reaction, so as to construct a reinforcing network in the uniform coating at the contact position between the aggregates.

9. The method of claim 1, wherein the method further comprises the step of adding a curing agent to the mixture. The quality evaluation steps further include: step S901, obtaining the cooling rate curve of the rapid road repair material in the polymerization reaction process in step S105; step S902, using the slope of the cooling rate curve to represent the convection heat dissipation characteristics of the internal pores of the rapid road repair material; and step S903, comparing the convection heat dissipation characteristics with a preset connectivity model to determine whether the connectivity porosity of the rapid road repair material meets the standard. The alkali-activated cementitious powder includes blast furnace slag powder and steel slag powder. The compressive strength of the hardened rapid road repair material is not less than , and the permeability coefficient is not less than 10. Use of a rapid road repair material, characterized in that The road surface rapid repair material is prepared by the road surface rapid repair material preparation method of claim 1, and is applied to the rapid repair of road surface pits and grooves.

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