Joint process of asphalt pavement

Abstract

The invention discloses a joint process of an asphalt pavement, and relates to the technical field of pavement engineering. According to the seaming process provided by the invention, a waterproof roll is laid in a seaming area, and a seaming material and a reinforcing agent are laid on the upper surface of the waterproof roll; carrying out compaction treatment, post-treatment and quality inspection on the joint material and the reinforcing agent in the joint area; through fine joint pretreatment, an optimized joint material and an improved construction process, the strength and the waterproof performance of the joints are remarkably improved, the problems that in a traditional joint method, the joints are insufficient in strength, prone to being eroded by water, prone to cracking and the like are effectively solved, and therefore the service life of the road is remarkably prolonged, the maintenance cost is reduced, and the service life of the road is prolonged. The method has remarkable economic benefits and social benefits, the sealing performance and durability of joints are ensured through layered laying of joint materials and compaction treatment of a hot-pressing process, and the method adapts to high-strength traffic loads and various weather conditions.

Description

Technical Field

[0001] The invention relates to the technical field of pavement engineering, and in particular to a jointing process for an asphalt pavement. Background Art

[0002] Asphalt pavements are widely used in highway and urban road construction, especially on expressways, as they provide a smooth driving surface, low maintenance costs and fast construction speed. Asphalt pavements have a flat surface, no joints, comfortable driving, wear resistance, low vibration and low noise, which make them very suitable for high-speed driving and urban environments.

[0003] During the asphalt pavement construction process, the pavement joints need to be treated. The purpose of joint treatment is to ensure the continuity and integrity of the asphalt pavement, prevent moisture and other harmful substances from entering the pavement structure through the joints, thereby reducing the generation and expansion of cracks and improving the stability and durability of the pavement. Good joint treatment also helps maintain the flatness of the pavement and driving safety.

[0004] The traditional method of joint treatment is to cover the joints with asphalt and then compact them with a roller. Although the process is simple, it often leads to problems such as insufficient joint strength, susceptibility to water erosion, and cracking. These problems will accelerate road damage and shorten the service life of the road.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a jointing process for an asphalt pavement, which can improve the jointing quality of the asphalt pavement and is of great significance for extending the service life of the road.

[0007] The present invention is achieved in that:

[0008] In a first aspect, an embodiment of the present invention provides a joint process for an asphalt pavement, the joint process comprising the following steps:

[0009] Lay waterproofing membranes in the joint area, and lay joint materials and reinforcing agents on the upper surface of the waterproofing membranes; compact, post-process and quality inspect the joint materials and reinforcing agents in the joint area;

[0010] The joint material is modified asphalt, wherein the modifier is selected from at least one of APP polymer and PMA polymer; based on the base asphalt, the addition amount of the modifier is 1%-8%;

[0011] The reinforcing agent includes polymer fibers, and the polymer fibers are selected from at least one of polypropylene fibers and glass fibers; the amount of the reinforcing agent added is 0.2%-1.1% based on the matrix asphalt;

[0012] The waterproofing membrane is selected from any one of SBS modified asphalt waterproofing membrane, self-adhesive polymer modified asphalt waterproofing membrane and APP modified asphalt waterproofing membrane.

[0013] The present invention has the following beneficial effects:

[0014] The jointing process for asphalt pavement provided in the embodiment of the present invention significantly improves the strength and waterproof performance of the joints through fine joint pretreatment, optimized joint materials and improved construction process, and effectively avoids the problems of insufficient joint strength, susceptibility to water erosion, cracking and the like in traditional jointing methods, thereby significantly extending the service life of the road and reducing maintenance costs, with significant economic and social benefits. By layering the joint materials and compacting them through hot pressing technology, the sealing and durability of the joints are ensured, and the joints can adapt to high-intensity traffic loads and various climatic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the process flow of the jointing process of the asphalt pavement provided by the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0018] Asphalt pavement is a road surface structure with a certain thickness that uses asphalt as a binder to bond mineral aggregates together. Asphalt pavement usually forms the entire pavement system together with other layers of structural materials (such as flexible base, semi-rigid base and cushion). Asphalt pavement has good high temperature stability, low temperature crack resistance, durability and anti-skid performance, and can effectively reduce driving noise and prevent water damage. Good jointing technology can improve the joint quality of asphalt pavement, which is of great significance to extending the service life of the road.

[0019] In a first aspect, an embodiment of the present invention provides a joint process for an asphalt pavement, the joint process comprising the following steps:

[0020] Lay waterproofing membranes in the joint area, and lay joint materials and reinforcing agents on the waterproofing membranes until the joint materials fill the joint area; compact, post-process and quality inspect the joint materials and reinforcing agents in the joint area;

[0021] The joint material is modified asphalt, wherein the modifier is selected from at least one of APP polymer and PMA polymer; based on the base asphalt, the addition amount of the modifier is 1%-8%;

[0022] The reinforcing agent includes polymer fibers, and the polymer fibers are selected from at least one of polypropylene fibers and glass fibers; the amount of the reinforcing agent added is 0.2%-1.1% based on the matrix asphalt;

[0023] The waterproofing membrane is selected from any one of SBS modified asphalt waterproofing membrane, self-adhesive polymer modified asphalt waterproofing membrane and APP modified asphalt waterproofing membrane.

[0024] In an optional embodiment of the present invention, the seam area is subjected to pre-treatment before the seam treatment, and the pre-treatment includes material preparation and seam pre-treatment.

[0025] Material preparation includes preparing joint materials, reinforcing agents, and cutting waterproof membranes based on the size of the joint area.

[0026] The joint material and the reinforcing agent are mixed in a certain proportion. In an optional embodiment of the present invention, the joint material is modified asphalt treated with a modifier.

[0027] It should be noted that the modified asphalt used in the optional embodiment of the present invention is prepared by adding a modifier to the base asphalt. By adding at least one of the modifier APP polymer and PMA polymer in the base asphalt, the high temperature stability, low temperature crack resistance and fatigue resistance of the asphalt are significantly improved, so that it can be used under a wider range of climatic conditions, and the service life of the road is extended. Modified asphalt can reduce the noise of the road surface, improve the water resistance and drainage performance of the road surface, reduce the formation of ice and water, and enhance the skid resistance of the road surface, thereby reducing the frequency of traffic accidents. In addition, modified asphalt also has the characteristics of high temperature resistance, low temperature resistance, strong adaptability, good toughness, fatigue resistance, stable performance, long life, etc., can delay aging, reduce highway maintenance costs, and reduce the accident loss caused by traffic accidents due to the inappropriateness of the highway itself. Modifiers are selected to be mixed with admixtures such as rubber, resin, high molecular polymer, ground rubber powder or other fillers according to actual needs, and what is used in the present invention is that high molecular polymer is mixed to improve asphalt.

[0028] Using modified asphalt as the joint material makes the joint area have higher strength and connectivity after compaction, which is convenient for the long-term use of the road surface. The joint area is not easily damaged, which reduces the frequency and cost of subsequent maintenance. At the same time, layered spraying and hot pressing processes are used to ensure the sealing and durability of the joints, which can adapt to high-intensity traffic loads and various climatic conditions.

[0029] Furthermore, in an optional embodiment of the present invention, based on the base asphalt, the amount of the modifier added is 2%-8%, which can be selected from any one of 2%, 4%, 6% and 8%, or other values ​​within the range of 2%-8%.

[0030] It should be noted that too much modifier in modified asphalt will lead to the following problems: it will cause the waterproofing membrane to break during processing, thus affecting the degradation of high temperature performance. In addition, too much modifier will also cause the "spring" phenomenon to appear during the construction of the waterproofing membrane modified asphalt mixture, affecting the compaction of the road surface. If the addition of modifier is insufficient, the adhesion and stability of the asphalt will be reduced, thus affecting the performance of the road: specifically, the adhesion of the road will decrease, resulting in the weakening of the road's crack resistance and water resistance, and cracks and potholes will be easily generated; it will make the asphalt material more easily softened at high temperatures, causing the road surface to be easily deformed and rutted, increasing the difficulty and cost of road maintenance; frequent maintenance will not only affect traffic, but also increase the overall maintenance cost; it will become fragile and prone to cracking at low temperatures, thus affecting the safety of the road; in addition, insufficient modifiers will also make the road surface more slippery under wet conditions, increasing driving risks.

[0031] The reinforcing agent is a polymer fiber. It should be noted that the addition of a reinforcing agent can significantly improve the axial and circumferential strength of the material, thereby enhancing the material's bearing capacity, enabling it to withstand higher internal pressure and external loads; it improves the material's impact resistance and can maintain good performance even in low temperature environments; it has good chemical corrosion resistance, ensuring the long-term stability of the material in harsh environments.

[0032] Furthermore, in an optional embodiment of the present invention, the polymer fiber can be selected from any one of polypropylene fiber and glass fiber according to actual needs; and the amount of the reinforcing agent used is 0.8%-1.1% based on the matrix asphalt.

[0033] In an optional embodiment of the present invention, the waterproof membrane is selected from any one of SBS modified asphalt waterproof membrane, self-adhesive polymer modified asphalt waterproof membrane and APP modified asphalt waterproof membrane.

[0034] The main function of the waterproofing membrane is to prevent water leakage. In a preferred embodiment of the present invention, SBS modified asphalt waterproofing membrane is selected.

[0035] SBS modified asphalt waterproof membrane is a high-elasticity, high-quality waterproof coating made by modifying high-quality petroleum asphalt with SBS copolymer thermoplastic elastomer as modifier, adding a variety of rubbers, synthetic resins, surfactants, emulsifiers, mildew inhibitors and other auxiliary materials, and refined by special equipment.

[0036] It should be noted that the specifications of the waterproof membrane can be cut according to the size of the actual joint area.

[0037] In an optional embodiment of the present invention, the joint pretreatment includes cutting off the residual asphalt or uneven parts in the joint area, removing the residual asphalt blocks, dust and oil stains around the joint area, and drying and preheating the joint area.

[0038] Specifically, the pretreatment of the joint area includes:

[0039] a. Level the joint area and use cutting equipment to remove the residual asphalt or uneven parts in the joint area;

[0040] b. Remove impurities from the joint area, such as residual asphalt, dust, and oil stains;

[0041] c. Dry the joint area using drying equipment such as a hot air blower to ensure that there is no moisture in the joint area;

[0042] d. Preheat the joint area to facilitate the subsequent laying of joint materials.

[0043] The purpose of preheating is to ensure the fluidity and adhesion of the asphalt material, to ensure that the newly laid material can better combine with the original pavement, to form a continuous and high-strength pavement structure, thereby improving the overall performance and durability of the pavement.

[0044] Specifically, the preheating method can be carried out according to actual needs, using any of the following methods and equipment:

[0045] (1) Infrared heater: This device heats the road surface by emitting infrared rays, raising the road surface temperature and thus improving the asphalt paving effect. The advantage of infrared heaters is that they heat quickly and can bring the road surface to the required temperature in a short time.

[0046] (2) Hot air generator: such as a hot air blower, this device heats the road surface by generating hot air, raising the road surface temperature. The advantage of a hot air generator is that it heats evenly, keeping the temperature of all parts of the road surface consistent.

[0047] (3) Flame heater: This device generates flames by burning fuel to raise the road surface temperature. The advantage of the flame heater is that it has a good heating effect and can make the road surface reach a higher temperature.

[0048] In an optional embodiment of the present invention, a layer of special joint coating agent is evenly sprayed on the pretreated joint area, and the coating agent is composed of a modified polymer and a tackifier. The use of the joint coating agent can improve the adhesion of the joint, and it has the characteristics of fast bonding speed, wide bonding range, low cost, etc. It will melt when heated to form a liquid state, and can be coated on the surface of various materials. After cooling, it solidifies to achieve adhesion. The present invention uses it in the joint area, and after the heating treatment, it is easy to penetrate into the tiny cracks and pores of the asphalt pavement, and chemically react or physically combine with the original asphalt material, thereby filling the cracks, repairing potholes, and restoring the flatness and integrity of the road surface.

[0049] Specifically, the coating agent may be TSA101 water-based asphalt base treatment agent: this is a base treatment agent made of high molecular polymer modified emulsified asphalt, suitable for base treatment before hot melt, self-adhesive asphalt coil or asphalt coating construction; it can effectively improve the bonding force between the waterproof layer and the base, and has the function of sealing the pores of the mortar base and blocking water vapor penetration. In other embodiments of the present invention, the specifications and types of the coating agent can be reasonably adjusted according to actual needs.

[0050] It should be noted that when spraying the joint coating agent, pay attention to the uniformity of the spraying, and then lay the waterproof membrane in the sprayed area.

[0051] Specifically, when laying the waterproof membrane, use a hot melt spray gun to heat and melt the joint coating agent on the bottom surface of the waterproof membrane so that the waterproof membrane can be quickly pasted on the base layer; during the laying process, pay attention to handling the joints, corners, edges and other details. The joints should be welded with a special welding machine to ensure the sealing and waterproofness of the joints. Appropriate fixing and sealing measures should be adopted at the corners and edges to prevent the membrane from warping or falling off.

[0052] In an optional embodiment of the present invention, a waterproof roll is laid in the joint area, and the joint material and the reinforcing agent are laid on the waterproof roll until the joint material fills the joint area. It should be noted that laying the SBS waterproof roll in the joint area first can effectively improve the waterproof ability of the joint and prevent the joint area from being eroded by water during long-term use.

[0053] Specifically, the joint material is laid in layers, and the thickness of each layer of the joint material is 2mm-5mm.

[0054] During laying, the joint material needs to be heated to 150℃-185℃ and evenly sprayed on the joints through a special nozzle. The molten joint material can be tightly bonded to the crack surface to form a solid repair layer, which is beneficial to the uniformity and stability of its laying. In addition, laying the molten joint material can also effectively prevent moisture and other harmful substances from penetrating into the cracks and protect the structural substrate.

[0055] After the joint material is sprayed, a layer of fine aggregate is quickly covered on the joint material to enhance the microstructure of the joint, increase the friction coefficient and reduce the risk of water inflow.

[0056] It should be noted that the joint material should be laid evenly and continuously on the waterproof membrane to ensure that it is tightly bonded to the waterproof membrane. During the laying process, attention should be paid to controlling the temperature and paving speed of the asphalt to avoid defects such as bubbles and wrinkles.

[0057] Fine aggregate mainly includes powdered mineral materials with a particle size of less than 0.075mm, with a hydrophilic coefficient of ≤1.0, and does not contain impurities such as soil and organic matter and agglomerates. Usually, powder obtained by grinding aggregates processed from alkaline rocks such as limestone and dolomite is used as filler. Powdered mineral materials such as talcum powder and ordinary Portland cement can also be used as fillers; it plays a filling role in asphalt mixtures and can improve the performance and durability of concrete and asphalt pavements. By rationally selecting and using fine aggregate, engineering design can be optimized, the amount of materials used and construction costs can be reduced. At the same time, by properly handling and recycling waste fine aggregate, the consumption of natural resources and environmental pollution can be reduced.

[0058] In an optional embodiment of the present invention, the joint area after laying the fine aggregate is compacted by hot pressing; further, the compaction temperature is 75° C.-110° C., and the time is 20 min-30 min.

[0059] Specifically, the joint materials laid in the joint area are compacted until the joint materials are flush with the road surface and there are no obvious marks at the joints; the compaction process is carried out using an asphalt pavement hot press. The specific type of hot press used can be a tire roller or a steel drum roller according to actual needs.

[0060] When compacting the joint area, for longitudinal joints, the cross-joint compaction method is adopted; for transverse joints, transverse compaction is carried out first, and then gradually transitioned to longitudinal compaction to ensure that the mixture at the joints is dense and free of gaps.

[0061] It should be noted that hot pressing of asphalt pavement is an important step to ensure the smoothness of the pavement and improve the compaction of the pavement. The asphalt pavement structure after hot pressing is dense and stable, which can effectively improve the anti-seepage performance, anti-skid performance, durability and density performance of the asphalt pavement, and is especially suitable for areas and use environments with high requirements for durability and safety.

[0062] Specifically, mechanical equipment is used to continuously compact the asphalt mixture to achieve a certain density and stability. The compacted asphalt pavement has a high density and can effectively resist the shear force generated by vehicles and the influence of external factors during driving, ensuring the smoothness, durability and safety of the road; the compacted asphalt pavement has good anti-skid performance and can resist the lateral force and transverse force generated by vehicles during driving, effectively reducing the side slip and skidding of vehicles and improving the driving safety of vehicles; the pavement structure of the compacted asphalt pavement is stable, which can increase the durability of the pavement, reduce the cost of pavement repair and maintenance, and increase the service life of the road, providing better protection for people's travel; the use of asphalt mixture for compaction is not only low-cost, but also can flexibly control the construction period and construction effect, and can meet the needs of different road construction.

[0063] In an optional embodiment of the present invention, the joint area after compaction is post-treated, and the post-treatment includes watering or covering the joint area for moisture retention.

[0064] It should be noted that asphalt has a low softening point. If the temperature is too high, it will become softer, and deformation and cracking will occur, which has a great impact on the service life and safety of the road surface. Watering treatment or covering moisturizing treatment can effectively reduce the ground temperature and prevent the road surface from cracking due to high temperature, thereby protecting the integrity of the road surface, reducing the gaps between material particles, and enhancing the friction between particles, thereby improving the compaction and durability of the road surface, reducing the road surface temperature, and preventing the road surface from cracking. It belongs to the reasonable maintenance of the joint area to promote the solidification and stabilization of the asphalt mixture in the joint area. Among them, it is necessary to pay attention to the appropriate amount, appropriateness, and uniformity of watering, and the frequency and time of watering should also be paid attention to during the period.

[0065] In an optional embodiment of the present invention, the post-processed joint area is subjected to a quality inspection process, the quality inspection process includes a flatness inspection and a strength inspection; the quality inspection process is performed to ensure that the joint area has qualified quality.

[0066] Among them, the flatness test is to ensure that the joint area is flush with the road surface, and the strength test is used to detect the compaction degree and connection strength of the joint area. Specifically, core sampling can be carried out on the joint area or a nuclear density meter can be used for testing to verify whether its compaction degree and connection strength meet the requirements. In addition, the higher the compaction degree and connection strength, the higher the strength of the joint, the less likely the joint will crack, and the longer the service life.

[0067] It should be noted that during the joint processing process, the joint location should avoid areas with frequent vehicle traffic and large loads to reduce stress concentration at the joints caused by vehicle rolling over.

[0068] Construction should be carried out in dry, rainless weather to avoid the influence of moisture on the bonding strength of the materials. The temperature should be controlled between 10℃-30℃ to avoid excessively high or low temperatures affecting the construction quality.

[0069] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0070] Example 1

[0071] This embodiment provides a joint process for asphalt pavement. For specific process flow, see Figure 1 , which comprises the following steps:

[0072] S1. Material preparation:

[0073] Select the joint material and reinforcing agent and mix them in a certain proportion. At the same time, cut the waterproof membrane based on the construction size of the joint area.

[0074] Among them, the joint material is modified asphalt, the modifier is specifically PMA, and the addition amount is 2%; the reinforcing agent adopts polymer fiber reinforcing agent, specifically polypropylene fiber, and the addition amount of the polymer fiber reinforcing agent is 1%; the waterproof membrane adopts SBS modified asphalt waterproof membrane.

[0075] S2. Seam pretreatment:

[0076] Pre-treat the joint area to ensure it is clean, tidy and dry.

[0077] Pretreatment of the joint area includes:

[0078] a. Level the joint area and use cutting equipment to remove the residual asphalt or uneven parts in the joint area;

[0079] b. Remove impurities from the joint area, such as residual asphalt, dust, and oil stains;

[0080] c. Dry the joint area using drying equipment such as a hot air blower to ensure that there is no moisture in the joint area;

[0081] d. Preheat the joint area to facilitate the subsequent laying of joint materials.

[0082] S3. Seam treatment:

[0083] Lay the waterproof membrane in the joint area, and then lay the joint material on the waterproof membrane, ensuring that it is tightly bonded to the membrane until the joint material fills the joint.

[0084] It should be noted that before laying the waterproof membrane, a layer of special joint coating agent should be evenly sprayed on the joint area. The coating agent is composed of modified polymers and tackifiers, which can improve the adhesion of the joints. When laying the waterproof membrane, use a hot melt spray gun to heat and melt the hot melt adhesive on the bottom of the membrane, and then quickly stick it to the base layer. During the laying process, attention should be paid to handling the joints, corners, edges and other details. The joints should be welded with a special welding machine to ensure the sealing and waterproofness of the joints. Appropriate fixing and sealing measures should be adopted at the corners and edges to prevent the membrane from warping or falling off.

[0085] When laying the joint material, a layered laying method is adopted, with each layer being 2mm thick. During laying, the joint material needs to be heated to 165°C and sprayed evenly on the joint through a special nozzle. After spraying, a layer of fine aggregate is quickly covered to enhance the microstructure of the joint, increase the friction coefficient, and reduce the risk of water inflow. The joint material should be laid evenly and continuously on the waterproof membrane to ensure close adhesion to the membrane. During the laying process, attention should be paid to controlling the temperature and paving speed of the asphalt to avoid defects such as bubbles and wrinkles.

[0086] S4, compaction treatment:

[0087] Compact the laid joint materials in the joint area until the joint materials are flush with the road surface and there are no obvious marks at the joints.

[0088] It should be noted that when compacting the joint area, hot pressing is adopted, specifically using an asphalt pavement hot press. During the compaction process, the temperature is controlled at 80°C and the hot pressing time is maintained for 30 minutes.

[0089] S5. Post-treatment: After the joint treatment is completed, maintenance should be carried out according to actual needs, such as sprinkling water to cool down or covering to keep moisturized, so as to promote the solidification and stabilization of the asphalt mixture at the joint.

[0090] S6. Quality inspection: Inspect the area where the seams have been processed to ensure that the seams are of qualified quality.

[0091] It should be noted that the inspection of the joint area includes flatness inspection and strength inspection. Flatness inspection ensures that the joint area is flush with the road surface, and strength inspection inspects the degree of compaction and connection strength. Specifically, core sampling can be performed on the joint or a nuclear density meter can be used for inspection to verify whether the compaction and connection strength meet the requirements.

[0092] The amount of materials used in the joint processing process and the sample test results at the joint are shown in Table 1.

[0093] Example 2

[0094] This embodiment provides a joint process for asphalt pavement. For specific process flow, see Figure 1 , which differs from Example 1 in that:

[0095] S1. Material preparation:

[0096] The joint material is modified asphalt, the modifier is specifically APP, and the addition amount is 8%; the reinforcing agent adopts polymer fiber reinforcing agent, specifically polyglass fiber, and the addition amount of the polymer fiber reinforcing agent is 1%; the waterproof membrane adopts SBS modified asphalt waterproof membrane.

[0097] S3. Seam treatment:

[0098] When laying the joint material, a layered laying method is adopted, with each layer being 5mm thick. When laying, the joint material needs to be heated to 185°C and evenly sprayed on the joints through a special nozzle.

[0099] S4, compaction treatment:

[0100] When compacting the joint area, hot pressing is adopted, specifically using an asphalt pavement hot press. During the compaction process, the temperature is controlled at 110°C and the hot pressing time is maintained for 20 minutes.

[0101] The amount of materials used in the joint processing process and the sample test results at the joint are shown in Table 1.

[0102] Comparative Example 1

[0103] This comparative example provides a joint process for an asphalt pavement, which adopts a conventional asphalt pavement joint process, and includes the following steps:

[0104] S1. Material preparation:

[0105] The reinforcing agent adopts a conventional reinforcing agent, specifically SBR powder; the waterproof membrane adopts a conventional waterproof membrane, specifically PVC waterproof membrane.

[0106] S3. Seam treatment:

[0107] When laying the joint material, a layered laying method is adopted, with each layer being 5mm thick.

[0108] Comparative Example 2

[0109] This comparative example provides a joint process for asphalt pavement. For the specific process flow, see Figure 1 , which differs from Example 1 only in that:

[0110] S1. Material preparation:

[0111] The reinforcing agent adopts conventional reinforcing agent, specifically SBR powder; the waterproof membrane adopts SBS modified asphalt waterproof membrane.

[0112] Comparative Example 3

[0113] This comparative example provides a joint process for asphalt pavement. For the specific process flow, see Figure 1 , which differs from Example 1 only in that:

[0114] S1. Material preparation:

[0115] The reinforcing agent adopts a polymer fiber reinforcing agent, specifically polypropylene fiber; the waterproof membrane adopts a conventional waterproof membrane, specifically PVC waterproof membrane.

[0116] Comparative Example 4

[0117] This comparative example provides a joint process for asphalt pavement. For the specific process flow, see Figure 1 , which differs from Example 1 only in that:

[0118] The reinforcing agent adopts a polymer fiber reinforcing agent, specifically glass fiber; the waterproof membrane adopts a conventional waterproof membrane, specifically PVC waterproof membrane.

[0119] It should be noted that the conventional process in Comparative Examples 2 to 4, namely the traditional joint treatment method, specifically involves covering the joint with asphalt and then compacting it with a roller.

[0120] Test Example 1

[0121] In this test example, the joint areas treated by the joint process of the asphalt pavement of Examples 1-2 and Comparative Examples 1-4 were sampled and tested. The specific use of the materials and the test results of Examples 1-2 and Comparative Example 1 are shown in Table 1, which is a performance comparison information of the joint process of the asphalt pavement provided by the present invention and the traditional joint process; the specific use of the materials and the test results of Comparative Examples 2-4 are shown in Table 2, which is a comparison information of the joint strength and waterproof performance when the waterproof membrane and the reinforcing agent are different under the same construction process and construction conditions:

[0122] For joint strength testing and waterproof performance testing, please refer to the "Highway Asphalt Pavement Design Specifications" (JTGD50-2017), "Highway Reconstruction and Expansion Asphalt Pavement Splicing Construction Technical Specifications" (DB61-T1490-2021), and "Highway Asphalt Pavement Interlayer Treatment Technical Specifications" (DB13T 2483-2017); It should be noted that the specific standard values ​​referenced during the test will change according to different engineering designs, traffic loads, environmental conditions and other factors.

[0123] Table 1

[0124] Experiment number Example 1 Example 2 Comparative Example 1 Joint strength (MPa) 4.2 4.6 3.8 Waterproof performance (permeability, mL / h) 0.04 0.03 0.09 <![CDATA[Asphalt content (kg / m 2 )]]> 1.2 1.6 1.4 Asphalt thickness (mm) 2 5 5 Construction temperature (℃) 165 185 165 Waterproof membrane SBS SBS Conventional waterproof membrane Enhancer Polypropylene fiber Fiberglass Conventional enhancers Fine aggregate dosage (%) 15 15 15 Lamination process 80℃ / 30min 110℃ / 20min Conventional pressing

[0125] Table 2

[0126] Experiment number Comparative Example 2 Comparative Example 3 Comparative Example 4 Joint strength (MPa) 3.7 4.1 4.0 Waterproof performance (permeability, mL / h) 0.05 0.09 0.11 Waterproof membrane SBS Conventional waterproof membrane Conventional waterproof membrane Enhancer Conventional enhancers Polypropylene fiber Fiberglass Construction technology Conventional process Conventional process Conventional process

[0127] Combining the experimental data of Table 1 and Table 2, the following conclusions can be drawn: Among them, the data of Example 1-Example 2 show that as the amount of asphalt increases, the corresponding construction temperature and asphalt thickness will also increase, and the strength and waterproof performance of the joint will be enhanced; the strength of the joint changes slightly with the type of reinforcing agent. The data from Comparative Examples 1-Comparative Examples 4 show that the combined use of SBS modified asphalt waterproofing membrane and reinforcing agent has a synergistic effect on the improvement of joint strength and waterproof performance, among which the improvement effect of waterproof performance is more significant: compared with Comparative Example 3, the waterproof performance of Example 1 is improved by 55.6%; compared with Comparative Example 4, the waterproof performance of Example 2 is improved by 72.7%.

[0128] In summary, the asphalt pavement joint process provided by the embodiment of the present invention significantly improves the strength and waterproof performance of the joints through fine joint pretreatment, optimized joint materials and improved construction process, effectively avoids the problems existing in traditional joint methods, thereby significantly extending the service life of the road and reducing maintenance costs. It has significant economic and social benefits, and ensures the sealing and durability of the joints through layered spraying and hot pressing processes, which can adapt to high-intensity traffic loads and various climatic conditions.

[0129] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A joint process for asphalt pavement, characterized in that: The seam joining process comprises the following steps: Laying waterproof coiled material in the joint area, laying joint material and reinforcing agent on the upper surface of the waterproof coiled material; performing compaction treatment, post-treatment and quality inspection on the joint material and reinforcing agent in the joint area; The joint material is modified asphalt, wherein the modifier is selected from at least one of APP polymer and PMA polymer; based on the base asphalt, the addition amount of the modifier is 1%-8%; The reinforcing agent comprises polymer fibers, and the polymer fibers are selected from at least one of polypropylene fibers and glass fibers; based on the matrix asphalt, the addition amount of the reinforcing agent is 0.2%-1.1%; The waterproof roll is selected from any one of SBS modified asphalt waterproof roll, self-adhesive polymer modified asphalt waterproof roll and APP modified asphalt waterproof roll.

2. The seam joining process according to claim 1, characterized in that: Based on the base asphalt, the addition amount of the modifier is 2%-8%, and the addition amount of the reinforcing agent is 0.8%-1.1%.

3. The seam joining process according to claim 1, characterized in that: The seam joining process also includes pre-treatment of the seam area, and the pre-treatment includes material preparation and seam pre-treatment; The material preparation includes preparing joint materials, reinforcing agents, and waterproofing rolls cut based on the size of the joint area; The joint pretreatment includes cutting off the residual asphalt or unevenness in the joint area, removing the residual asphalt blocks, dust and oil stains around the joint area, and drying and preheating the joint area.

4. The seam joining process according to claim 1, characterized in that: Before laying the waterproof coiled material in the joint area, the method further includes spraying a joint coating agent in the joint area, wherein the joint coating agent includes a modified polymer and a tackifier; Preferably, after laying the waterproof coiled material in the joint area, the method further includes heating the waterproof coiled material.

5. The seaming process according to claim 1, characterized in that: The joint material is laid in layers, and the thickness of each layer of the joint material is 2mm-5mm.

6. The seaming process according to claim 5, characterized in that: The joint material is heated to 150° C.-185° C. and then laid in the joint area.

7. The seaming process according to claim 6, characterized in that: The laid joint material is covered with fine aggregate.

8. The seaming process according to claim 7, characterized in that: The joint area after laying fine aggregate is compacted by hot pressing; Preferably, the compaction treatment is carried out at a temperature of 75°C to 110°C and for a time of 20 min to 30 min.

9. The seaming process according to claim 8, characterized in that: The joint area after compaction is post-treated; the post-treatment includes watering or covering the joint area for moisture retention.

10. The seaming process according to claim 9, characterized in that: The post-processed joint area is subjected to quality inspection, and the quality inspection includes flatness inspection and strength inspection.

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