A pavement structural layer for rutting repair of guide lanes and its construction process

Abstract

This invention relates to a pavement structure layer for rutting repair of guideways and its construction process, belonging to the field of road engineering technology. The pavement structure layer includes a lower layer, an upper layer, connecting aggregate for linking the lower and upper layers, and aggregate located in the lower layer. Using this pavement structure layer to repair rutting in guideways prevents the formation of new rutting, saves maintenance costs, ensures driving comfort and safety, avoids disruptions to road traffic caused by frequent repairs, and also avoids resource waste and environmental pollution caused by repairs. The construction process of this invention divides the guideway into rutting and non-rutting zones. In the non-rutting zone, the original pavement is milled to a thickness of only 3 cm, maximizing the use of the original pavement, reducing the amount of repair work, lowering repair costs, and reducing waste pollution caused by repairs.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, and in particular to a pavement structural layer for rutting repair of guide lanes and its construction process. Background Technology

[0002] Currently, most urban and trunk roads in my country use a semi-rigid base asphalt pavement structure. While the semi-rigid base itself does not produce rutting, rutting is quite severe and widespread in the guide lanes. The reasons are twofold: first, the shear strength of the asphalt pavement is insufficient, or relatively insufficient; second, the use of bonding asphalt between layers induces rutting. Visually, these ruts have a concave zone in the middle and convex zones on both sides. The vast majority of ruts on asphalt pavements in my country belong to this type (called unstable rutting), and are an early-stage defect.

[0003] The asphalt pavement of the guide lanes commonly suffers from severe rutting, which greatly reduces driving comfort, poses safety hazards, and leads to frequent repairs, affecting road traffic, increasing maintenance costs, and also causing resource waste and environmental pollution. This is a problem that must be solved.

[0004] To prevent rutting on asphalt pavements, several technologies have been developed, including "Construction Technology of Emulsified Asphalt Slurry Mixture Penetration Asphalt Pavement," "A Penetration Asphalt Pavement of Emulsified Asphalt Slurry Mixture," "A Type of Equal-Thickness Aggregate Crushed Stone Asphalt Concrete Pavement and Its Construction Method," and "Construction Technology of Hot-Mix Asphalt Mixture Equal-Thickness Aggregate Crushed Stone Pavement." Their common feature is the use of crushed stone with a particle size equal to the pavement thickness (called equal-thickness aggregate crushed stone) to form a "top-and-bottom" framework, ensuring the asphalt pavement does not rut. However, their limitation lies in the difficulty of obtaining a large quantity of equal-thickness aggregate crushed stone. Furthermore, the crushed stone is not a regularly shaped object; the particle sizes in mutually perpendicular directions are mostly unequal. After spreading, the equal-thickness aggregate is in a "flat" state, while the majority of particles smaller than the pavement thickness are in an "upright" state. In other words, ensuring that a large quantity of crushed stone with a particle size equal to the pavement thickness in the normal direction is difficult, if not impossible. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a pavement structure layer for rutting repair of guide lanes and its construction process, with the aim of preventing rutting of the asphalt pavement of guide lanes.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A pavement structure layer for rutting repair of guideways includes a lower layer, an upper layer, connecting aggregate for connecting the lower and upper layers, and aggregate located in the lower layer, wherein the aggregate in the lower layer includes aggregate with a maximum particle size d. maxCrushed stone and other crushed stone of different particle sizes in the underlying layer, wherein the maximum particle size d in the underlying layer is... max The particle size of the crushed stone conforms to the requirements of the "Technical Specification for Construction of Asphalt Pavement on Highways" (JTG F40-2004);

[0008] The particle size of the connecting crushed stone used to connect the lower and upper layers is the upper layer thickness a + lower layer thickness b - maximum particle size of the lower layer d. max Crushed stone particle size ~ upper layer thickness a + lower layer thickness b, specifically including the maximum particle size D max Connecting crushed stone and other particle sizes, with a maximum particle size D max The particle size of the connecting crushed stone is equal to the thickness of the upper layer (a) plus the thickness of the lower layer (b).

[0009] Studies have shown that for double-layer asphalt pavement structures, when the compressive resilient modulus of the lower layer is significantly larger than that of the upper layer, the main site of rutting is not the lower layer, but the upper layer. Therefore, the range for selecting the particle size D of the connecting aggregate is: upper layer thickness a + lower layer thickness b - maximum particle size d of the lower layer. max The aggregate size is equal to the thickness of the upper layer (a) plus the thickness of the lower layer (b). A portion of the aggregate, with a diameter equal to the maximum diameter of the double-layer asphalt pavement structure, forms a strong, vertically integrated framework. The remaining aggregate is embedded in a semi-rigid, semi-flexible lower layer that prevents rutting and extends throughout the full thickness of the upper layer. This design of the lower layer and the aggregate not only prevents rutting in the lower layer and the aggregate itself, but also prevents rutting in the upper layer, which has a lower compressive resilience modulus. This limits vertical plastic deformation of the double-layer asphalt pavement structure, preventing rutting as a whole. Furthermore, the abundant aggregate ensures a strong bond between the upper and lower layers, guaranteeing or improving the load-bearing capacity of the double-layer asphalt pavement structure. Moreover, this design eliminates the need for interlayer bonding asphalt.

[0010] Furthermore, the connecting aggregate used to connect the lower and upper layers is pre-coated rubber asphalt aggregate, with an asphalt-aggregate ratio (mass ratio of rubber asphalt to aggregate) of 1.0% to 2.0%, and a dosage of 20m³. 3 / 1000m 2 ~60m 3 / 1000m 2 .

[0011] Furthermore, the maximum particle size D max The content of connecting gravel is ≥30%.

[0012] Furthermore, the lower layer is a semi-rigid, semi-flexible pavement, comprising the following components by weight: 100 parts aggregate, 5-10 parts emulsified asphalt, 2-4 parts cement, 1-2 parts waste tire rubber powder, 0.4-0.8 parts waste tire fiber, 0.5-1.5 parts waterborne epoxy resin, 0.1-0.5 parts waterborne epoxy resin curing agent, 4-8 parts water, and 0-0.25 parts additives.

[0013] Furthermore, the aggregate gradation conforms to the AC-25 type gradation in the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40-2004); the emulsified asphalt is cationic slow-setting and slow-curing type with a solid content ≥60%; the cement is grade 32.5 or grade 42.5 silicate cement; the waste tire rubber powder has a particle size of 30 mesh to 60 mesh; the waste tire fiber is fiber generated during the processing of waste tire rubber powder; the waterborne epoxy resin is cationic water-dispersible polyurethane resin with a solid content ≥50%; the waterborne epoxy resin curing agent is a water-soluble polyamide adduct with a solid content of 48% to 52%; and the additives are powdered aluminate and carbonate cement accelerators.

[0014] Furthermore, the design method for the mix proportion of the lower layer mixture is as follows:

[0015] (1) Determine the amount of materials needed

[0016] The aggregate mix design shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement"; the material dosage shall be determined based on experience, and the median value of the dosage range shall be selected first to obtain the design mix proportion of the lower layer mixture;

[0017] (2) Preparation of the lower layer mixture for the experiment

[0018] Mix the materials thoroughly according to the mix design ratio of the lower layer mixture, and set aside.

[0019] (3) Inspect the slump S of the lower layer mixture L

[0020] After the lower layer of mixture is thoroughly mixed, a slump test is immediately performed according to the method in (T 0522-2005) "Test Method for Consistency of Cement Concrete Mixture (Slump Tester Method)". The slump control range is: 30mm ≤ S L ≤50mm, and S L The holding time for ≥30mm is >20 minutes; slump is a comprehensive indicator characterizing the workability of the lower layer mixture. It comprehensively reflects the emulsification time of emulsified asphalt, mixing time, initial setting time of cement, reaction and hardening rate of the mixture, water retention and plasticity of the mixture, material compatibility, etc. Studies have shown that as long as the slump meets the above requirements, construction can be completed smoothly; if the requirements are met, continue the test; otherwise, adjust the design mix ratio of the lower layer mixture and retest from scratch.

[0021] (4) Test the 12h unconfined compressive strength R of the lower layer mixture. C12

[0022] After the lower layer of mixture is thoroughly mixed, an unconfined compressive strength test is immediately performed according to the method of (T 0805-1994) "Unconfined Compressive Strength Test of Inorganic Binder Stabilized Materials" (but the specimen is not immersed in water); the control value of the unconfined compressive strength after 12 hours is: R C12 If the pressure is ≥2MPa, continue testing if the requirement is met; otherwise, adjust the mix design of the lower layer mixture and start the test again from scratch.

[0023] (5) Test the compressive resilient modulus E of the lower layer mixture. C

[0024] After the lower layer of mixture is thoroughly mixed, the compressive resilient modulus test is performed according to the method in (T 0808-1994) "Indoor Test Method for Compressive Resilient Modulus of Inorganic Binder Stabilized Materials (Top Surface Method)". The control value for the compressive resilient modulus is: E C ≥3000MPa. If the requirement is met, the design mix proportion of the lower layer mixture can be used for construction; otherwise, adjust the design mix proportion of the lower layer mixture and retest from scratch.

[0025] Studies have shown that for double-layer asphalt pavement structures, when the compressive resilient moduli of the upper and lower layers are similar or the upper layer has a larger resilient moduli than the lower layer, the lower layer is the primary site for rutting. Cement-emulsified asphalt concrete pavement, which uses cement and asphalt (referring to the evaporation residue of emulsified asphalt) as composite binders, is a semi-rigid, semi-flexible pavement. Its compressive resilient modulus can easily reach over 3500 MPa, which is 2 to 3 times that of asphalt concrete pavement. It has outstanding rutting resistance and is commonly known as a "pavement that will not rut." Therefore, this type of pavement is chosen for the lower layer. Increasing the amount of cement leads to increased road surface rigidity and strength; increasing the amount of emulsified asphalt leads to increased road surface flexibility; however, this type of road surface generally has poor crack resistance, so waste tire rubber powder and waste tire fibers are added to improve its crack resistance. However, increasing the amount of waste tire rubber powder and waste tire fibers will worsen the workability of the underlying mixture. Furthermore, this type of road surface has a slow strength development, generally requiring 5-7 days of curing time. Therefore, water-based epoxy resin and water-based epoxy resin curing agent are added to control its curing time within 24 hours, shortening the construction time. Simultaneously, water-based epoxy resin and water-based epoxy resin curing agent... It also improves the rutting resistance of the pavement, but increasing the amount of water-based epoxy resin and water-based epoxy resin curing agent will lead to a decrease in the workability of the lower layer mixture. Water's role is to regulate the workability of the lower layer mixture; increasing water usage will result in maximum slump, prolong the slump holding time, and extend the demulsification time of emulsified asphalt. Furthermore, water also participates in the reaction. Additives play two roles: firstly, they regulate the demulsification time of emulsified asphalt during the construction stage, extending its demulsification time; secondly, they accelerate the hardening reaction of cement during the curing stage, but they are not essential and should only be used when necessary. Understanding the roles of various materials is beneficial for comprehensively and accurately grasping the mix design of the lower layer mixture to ensure its workability and road performance meet standards.

[0026] Furthermore, the upper layer is AC-13 or AC-10 type rubber asphalt concrete. Its components, mix design method, and material quality meet the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement".

[0027] A construction process for a pavement structural layer used for rutting repair of guide lanes includes the following steps:

[0028] The first step is to mill the original road surface of the guide lane.

[0029] (1) Milling the raised part of the wheel rut

[0030] The raised part of the rut is the part of the road surface that is higher than the top surface of the road before the ruts were formed (referred to as the original road top surface). After milling it away, the rut depression will be revealed. On the cross section at the widest part of the rut depression, each rut has two boundary points between the rut depression and the original road top surface (referred to as boundary points). The parallel lines of the road centerline are marked through the two boundary points. The part between the two parallel lines is called the rut depression zone. The other rut depression zone of the same guideway is marked in the same way.

[0031] (2) The area outside the two rut depressions in the guide lane is called the non-rut depression zone. There are three non-rut depression zones facing the direction of vehicle travel, which are called the left non-rut depression zone, the middle non-rut depression zone and the right non-rut depression zone respectively. The milling thickness of the non-rut depression zone is 3cm, that is, the thickness a of the upper layer is a fixed value of 3cm.

[0032] (3) The original asphalt pavement is completely milled away at the location of the two ruts. The location of the ruts where the original asphalt pavement is completely milled away is called the rut groove.

[0033] The second step is to connect the crushed stone mixing plant.

[0034] The mixing of the aggregate should be carried out in accordance with the requirements for asphalt aggregate in the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40-2004);

[0035] The third step is to connect the crushed stone transportation.

[0036] Transport the connecting crushed stone to the site for later use;

[0037] Step 4: Mix the lower layer of mixture.

[0038] (1) Mix the emulsified asphalt and water-based epoxy resin and stir evenly for later use;

[0039] (2) The mixing of the lower layer mixture is carried out on-site by a forced mixer; aggregate → waste tire rubber powder → waste tire fiber → cement are added in sequence and mixed evenly. Then, water → emulsified asphalt and water-based epoxy resin mixture → water-based epoxy resin curing agent → additives are added in sequence and mixed evenly.

[0040] (3) After the lower layer of mixture is evenly mixed, it is discharged and poured directly into the rut depression groove;

[0041] Step 5: Laying the lower layer of mixture

[0042] Spread the lower layer of mixture poured into the rut depression groove and level it.

[0043] Step 6: Vibrate and compact the lower layer of mixture.

[0044] The lower layer of mixture is compacted using a plate vibrator;

[0045] Step 7: Leveling the lower layer of mixture

[0046] Level the top surface of the compacted lower layer of mixture;

[0047] Step 8: Spread connecting gravel

[0048] After the lower layer of mixture is compacted and leveled, the connecting crushed stone is immediately spread, and the connecting crushed stone is required to be spread evenly.

[0049] Step 9: Vibratory rolling to connect the crushed stone

[0050] Turn on the roller vibration and roll the spread connecting crushed stone to embed the connecting crushed stone into the lower layer of mixture;

[0051] After planting the connecting crushed stone, the height difference between the top surface of the original road and the top surface of the lower layer of mixed material should be controlled within the range of 30mm to 32mm;

[0052] Step 10, Maintenance

[0053] Moisturize and nourish for at least 12 hours to allow the underlying R layer to... C12 ≥2MPa;

[0054] Step 11: Mix the top layer of mixture.

[0055] It shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement";

[0056] Step 12, Transportation of the upper layer mixture

[0057] It shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement";

[0058] Step 13: Laying the top layer of mixture

[0059] The paving width of the top layer mixture is the same as the width of the guide lane, and shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement";

[0060] Step 14: Compacting the top layer of mixture.

[0061] It shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement";

[0062] Step 15: Open traffic

[0063] The construction shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Asphalt Pavement on Highways".

[0064] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0065] 1. This invention is scientifically sound and reduces technical difficulty.

[0066] In existing technologies, the design of asphalt pavements requires consideration of both ends, meaning that good rutting resistance and crack resistance are both required, commonly known as "two-sided consideration." However, in reality, only one end can often be considered, and the technical difficulty of "considering both ends" is significant. The ingenious design of this invention allows for a scientific and reasonable division of labor among different parts of the asphalt pavement structural layer. Specifically, the lower layer and connecting aggregate ensure the overall rutting resistance of the asphalt pavement structural layer, while reducing the requirements for the rutting resistance of the upper layer. It only needs to ensure its crack resistance and sealing properties, thus achieving "considering one end" and reducing the technical difficulty.

[0067] 2. This invention improves the design theory of asphalt pavement structural layers and promotes technological progress.

[0068] The consensus in existing technology is that "in a double-layer asphalt pavement structure, the lower layer is the main site of rutting." This is not universally true. It is correct when the compressive resilient moduli of the upper and lower layers are similar or when the upper layer has a larger resilient modulus than the lower layer, in which case ensuring the rutting resistance of the lower layer is more important, and therefore its compressive resilient modulus should be increased. However, when the compressive resilient modulus of the lower layer is significantly larger than that of the upper layer, the main site of rutting is not the lower layer, but the upper layer. In this case, the rutting resistance of the upper layer must also be ensured. Due to errors in design theory, rutting can occur in both the upper and lower layers in engineering practice.

[0069] This invention identifies and corrects errors in existing technologies for the design of asphalt pavement structural layers, improves the design theory of asphalt pavement structural layers, significantly increases the compressive resilient modulus of the lower layer, and ensures that the upper layer, which has a much smaller compressive resilient modulus, will not develop ruts, thus promoting technological progress.

[0070] 3. The technology of this invention will prevent the formation of ruts after the guide lane is repaired, saving maintenance costs, ensuring driving comfort and safety, avoiding road traffic disruptions caused by frequent maintenance, and also avoiding resource waste and environmental pollution caused by maintenance.

[0071] 4. Through ingenious design, this invention divides the guideway into rutted and non-rutted zones. The original road surface in the non-rutted zone is milled to a thickness of only 3cm, maximizing the use of the original road surface, reducing the amount of maintenance work, lowering maintenance costs, and reducing waste pollution caused by maintenance. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of the pavement structure layer for rutting repair of guide lanes according to the present invention;

[0073] Figure 2This is a construction process diagram for repairing ruts on the guideway of the present invention;

[0074] In the diagram, 1-semi-rigid base layer, 2-lower layer, 3-upper layer, 4-maximum particle size D max 5- Connecting crushed stone, 6- Other particle size connecting crushed stone, 7- Maximum particle size d of the lower layer max Crushed stone, 7-lower layer of other crushed stone of different sizes. Detailed Implementation

[0075] The technical solution and effects of the present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto. Example 1

[0076] Known conditions in this embodiment: Guide lane width 375cm, original asphalt pavement design thickness 10cm. Severe unstable rutting occurred, requiring repair.

[0077] I. Preparatory work before rut repair on the guide road

[0078] (1) Mix design of the lower layer mixture

[0079] 1) Aggregate mix design

[0080] The aggregate adopts AC-25 gradation, which means that its maximum crushed stone particle size d max =31.5mm, the aggregate mix design is carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement", which will not be elaborated here. The design result is: 19.0mm~31.5mm crushed stone: 9.5mm~19mm crushed stone: 4.75mm~9.5mm crushed stone: 0mm~4.75mm crushed stone: mineral powder = 14:20:27:35:4.

[0081] 2) Mix proportion design

[0082] Using the median range of material usage, but without using additives, the mix proportion is: aggregate: emulsified asphalt: cement: waste tire rubber powder: waste tire fiber: water-based epoxy resin: water-based epoxy resin curing agent: water = 100:7.5:3:1.5:0.6:1:0.3:6.

[0083] 3) Preparation of the experimental lower layer mixture

[0084] The preparation method of the lower layer mixture used in the experiment is as follows:

[0085] ① Mix and blend the various materials according to the following ratio: 19.0mm~31.5mm crushed stone: 9.5mm~19mm crushed stone: 4.75mm~9.5mm crushed stone: 0mm~4.75mm crushed stone: mineral powder = 14:20:27:35:4 to obtain aggregate.

[0086] ② Mix the emulsified asphalt and water-based epoxy resin in a ratio of 7.5:1 and stir until homogeneous.

[0087] ③ Mixing of the lower layer mixture. According to the mix ratio of aggregate: emulsified asphalt: cement: waste tire rubber powder: waste tire fiber: water-based epoxy resin: water-based epoxy resin curing agent: water = 100:7.5:3:1.5:0.6:1:0.3:6, use a forced mixer to mix. Add aggregate → waste tire rubber powder → waste tire fiber → cement in sequence, and mix thoroughly. Then add water → the mixture of emulsified asphalt and water-based epoxy resin → water-based epoxy resin curing agent in sequence, and mix thoroughly. Set aside.

[0088] 4) Inspect the slump S of the lower layer mixture. L

[0089] After the lower layer of mixture is thoroughly mixed, a slump test is immediately performed according to the method specified in (T 0522-2005) "Test Method for Consistency of Cement Concrete Mixture (Slump Tester Method)". The test result is: S L =40mm, and S L Holding time ≥30mm = 25 minutes, satisfying 30mm ≤ S L ≤50mm, and S L The requirement is that the holding time for ≥30mm should be >20 minutes.

[0090] 5) Test the 12-hour unconfined compressive strength R of the lower layer mixture. C12

[0091] After the lower layer of mixture is thoroughly mixed, an unconfined compressive strength test is immediately performed according to the method of (T 0805-1994) "Unconfined Compressive Strength Test of Inorganic Binder Stabilized Materials" (but the specimen is not immersed in water). The test result is: R C12 = 2.6MPa, satisfying R C12 The requirement is ≥2MPa.

[0092] 6) Test the compressive resilient modulus E of the lower layer mixture. C

[0093] After the lower layer of mixture is thoroughly mixed, the compressive resilient modulus test is performed according to the method in (T 0808-1994) "Indoor Test Method for Compressive Resilient Modulus of Inorganic Binder Stabilized Materials (Top Surface Method)". The test result is: E C ≥3850MPa, meets E C The requirement of ≥3000MPa means that the mix design of the lower layer mixture can be used for construction.

[0094] (2) Design of aggregate mix proportion

[0095] 1) Determine the particle size of the connecting crushed stone

[0096] According to a + b - d max The particle size range of the connecting crushed stone is calculated as ≤D≤a+b, and the result is: 68.5mm≤D≤100mm.

[0097] 2) Determine the asphalt-aggregate ratio for connecting crushed stones.

[0098] The oil-stone ratio was determined based on experience and was selected as 1.5%.

[0099] (3) Mix design of the upper layer mixture

[0100] The top layer uses AC-13 type rubber asphalt concrete, and its mix design is carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement", which will not be elaborated here.

[0101] The design results are as follows:

[0102] 1) The aggregate mix ratio is: 9.5mm~16.0mm crushed stone: 4.75mm~9.5mm crushed stone: 0mm~4.75mm crushed stone: mineral powder = 26:27:43:4;

[0103] 2) The oil-stone ratio is 5.6%.

[0104] (4) Trial paving of the lower layer of aggregate and connecting crushed stone to determine the amount of lower layer aggregate and connecting crushed stone per unit area; trial paving of the upper layer of aggregate to determine the loose paving coefficient.

[0105] In a 100cm×100cm×10cm trial mold (mold height equal to the original pavement design thickness), a 5cm thick base course mix was laid, compacted, and leveled. Connecting aggregate was then spread, with the net distance between the aggregate stones controlled at 2cm–3cm. A 110cm×110cm steel plate was placed on the connecting aggregate, and then vibrated down until the steel plate contacted the trial mold. Measurements showed that the top surface of the base course mix was 31mm from the top edge of the trial mold; this is the required thickness for the top course, referred to as the trial top course thickness, which is within the range of 30mm–32mm, meeting the requirements. The amount of connecting aggregate used was 0.03m³. 3 / m 2 The amount of the lower layer mixture is 1m³. 2 ×5cm=0.05m 3 / m 2 .

[0106] In the above-mentioned trial mold, the surface layer mixture was laid with a thickness of 33mm. After compaction (compaction degree reached ≥99%), its thickness was 31mm. Therefore, the loose paving coefficient is 33mm÷31mm≈1.1.

[0107] II. Repair of guideway ruts

[0108] like Figure 2 As shown, it includes the following steps:

[0109] The first step is to mill the original road surface of the guide lane.

[0110] (1) Milling the rut protrusions. Mill the rut protrusions that are higher than the original road surface. Then, after measurement, the width of the widest part of the rut depression on the cross section is 100cm. Therefore, the width of the two rut depressions is 100cm. Mark the parallel line of the road centerline through the dividing point and mark the position of the rut depressions on the road. Then, after measurement, the widths of the left, middle and right non-rut depressions are 37.5cm, 100cm and 37.5cm respectively.

[0111] (2) The milling thickness of the non-rut depressions on the left, middle and right sides is 3cm.

[0112] (3) The original asphalt pavement in the two rutted areas was milled off.

[0113] The second step is to connect the crushed stone mixing plant.

[0114] The mixing of the aggregate should be carried out in accordance with the requirements of asphalt aggregate in the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40-2004), where the aggregate particle size is 68.5mm~100mm and the asphalt-aggregate ratio is 1.5%.

[0115] The third step is to connect the crushed stone transportation.

[0116] Transport the connecting crushed stone to the site for later use.

[0117] Step 4: Mix the lower layer of mixture.

[0118] (1) Mix and blend the various materials according to the ratio of 19.0mm~31.5mm crushed stone: 9.5mm~19mm crushed stone: 4.75mm~9.5mm crushed stone: 0mm~4.75mm crushed stone: mineral powder = 14:20:27:35:4 to obtain aggregate for later use.

[0119] (2) Mix emulsified asphalt and water-based epoxy resin in a ratio of 7.5:1 and stir evenly for later use.

[0120] (3) According to the mix ratio of aggregate: emulsified asphalt: cement: waste tire rubber powder: waste tire fiber: waterborne epoxy resin: waterborne epoxy resin curing agent: water = 100:7.5:3:1.5:0.6:1:0.3:6, use a forced mixer to mix, add aggregate → waste tire rubber powder → waste tire fiber → cement in sequence, and mix evenly, then add water → emulsified asphalt and waterborne epoxy resin mixture → waterborne epoxy resin curing agent → additives in sequence, and mix evenly.

[0121] (4) After the lower layer of mixture is evenly mixed, it is discharged and poured directly into the rut depression groove.

[0122] Step 5: Laying the lower layer of mixture

[0123] According to 0.05m 3 / m 2 Use the specified amount to spread the lower layer of mixture into the rut depression groove and level it.

[0124] Step 6: Vibrate and compact the lower layer of mixture.

[0125] The lower layer of mixture is compacted using a plate vibrator.

[0126] Step 7: Leveling the lower layer of mixture

[0127] Level the top surface of the compacted lower layer of mixture.

[0128] Step 8: Spread connecting gravel

[0129] After the lower layer of mixture is compacted and leveled, it is then laid according to a 0.03m... 3 / m 2 The amount of aggregate used should be spread evenly, and the net distance between the aggregates should be controlled between 2cm and 3cm.

[0130] Step 9: Vibratory rolling to connect the crushed stone

[0131] Use a vibrating roller with a length of not less than 400cm to turn on the vibration and roll and compact the spread connecting crushed stone, embedding the connecting crushed stone into the lower layer of mixture.

[0132] Step 10, Maintenance

[0133] Moisturize and nourish for at least 12 hours.

[0134] Step 11: Mix the top layer of mixture.

[0135] The construction shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Asphalt Pavement on Highways".

[0136] Step 12, Transportation of the upper layer mixture

[0137] The construction shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Asphalt Pavement on Highways".

[0138] Step 13: Laying the top layer of mixture

[0139] The thickness of the top layer mixture = loose paving coefficient × trial paving thickness of the top layer = 1.1 × 31 mm ≈ 34 mm; the width of the top layer mixture is the width of the guide lane, i.e., 375 cm. The paving of the top layer mixture shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Highway Asphalt Pavement".

[0140] Step 14: Compacting the top layer of mixture.

[0141] The construction shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Asphalt Pavement on Highways".

[0142] Step 15: Open traffic

[0143] The construction shall be carried out in accordance with the requirements of (JTG F40-2004) "Technical Specification for Construction of Asphalt Pavement on Highways".

[0144] The pavement structure layer formed according to this construction process for rutting repair of guideways is as follows: Figure 1 As shown, located above the semi-rigid base layer 1, it includes a lower layer 2, an upper layer 3, connecting gravel for connecting the lower and upper layers, and gravel located in the lower layer. The gravel in the lower layer includes the gravel with the largest particle size d in the lower layer. max Crushed stone 6 and other crushed stone 7 of different particle sizes in the lower layer, wherein the maximum particle size d of the lower layer is... max The particle size of crushed stone 6 conforms to the requirements of (JTG F40-2004) "Technical Specification for Construction of Asphalt Pavement on Highways"; the particle size of the connecting crushed stone used to connect the lower layer 2 and the upper layer 3 is the upper layer thickness a + lower layer thickness b - maximum particle size d of the lower layer. max Crushed stone particle size ~ upper layer thickness a + lower layer thickness b, specifically including the maximum particle size D max Connecting crushed stone 4 and other particle size connecting crushed stone 5, with a maximum particle size D max The particle size of the connecting crushed stone 4 is equal to the sum of the thickness of the upper layer (a) and the thickness of the lower layer (b).

[0145] It should be noted that the above embodiments are illustrative of the technical solutions of the present invention and not limiting thereof. Equivalent substitutions or other modifications made by those skilled in the art based on the prior art, as long as they do not exceed the concept and scope of the technical solutions of the present invention, should be included within the scope of the claims of the present invention.

Claims

1. A pavement structural layer for rutting repair of guideways, characterized in that, The pavement structure layer is located above the semi-rigid base layer and includes a lower layer, an upper layer, connecting aggregate for connecting the lower layer and the upper layer, and aggregate located in the lower layer; The crushed stone in the lower layer includes the largest particle size d in the lower layer. max Crushed stone and other crushed stone of different particle sizes in the underlying layer, wherein the maximum particle size d in the underlying layer is... max The particle size of the crushed stone conforms to the specifications of JTG F40-2004 Technical Specification for Construction of Highway Asphalt Pavement; The particle size of the connecting crushed stone used to connect the lower and upper layers is the upper layer thickness a + lower layer thickness b - maximum particle size of the lower layer d. max Crushed stone particle size ~ upper layer thickness a + lower layer thickness b, specifically including the maximum particle size D max Connecting crushed stone and other particle sizes, with a maximum particle size D max The particle size of the connected crushed stone is the sum of the thickness of the upper layer (a) and the thickness of the lower layer (b). In this pavement structure layer, a portion of the connecting crushed stone with a particle size equal to the maximum particle size of the double-layer asphalt pavement structure layer thickness forms a strong "sky-high and earth-standing" skeleton. The other connecting crushed stone is planted in a semi-rigid and semi-flexible lower layer that will not produce rutting, and runs through the full thickness of the upper layer. This design of the lower layer and connecting crushed stone not only ensures that the lower layer and connecting crushed stone themselves will not produce rutting, but also ensures that the upper layer with a smaller compressive resilience modulus will not produce rutting. In this way, it can limit the vertical plastic deformation of the double-layer asphalt pavement structure layer, so that it will not produce rutting as a whole. In this pavement structure layer, interlayer bonding asphalt is no longer required. The connecting aggregate used to link the lower and upper layers is pre-coated rubber-coated asphalt aggregate with an asphalt-aggregate ratio of 1.0% to 2.0%, and a dosage of 20m³. 3 / 1000m 2 ~60m 3 / 1000m 2 ; The maximum particle size D max The content of connecting gravel is ≥30%; The lower layer is a semi-rigid, semi-flexible pavement, with a compressive resilience modulus control value of: E C ≥3000MPa.

2. The pavement structure layer for rut repair of guide lanes according to claim 1, characterized in that, The lower layer is a semi-rigid, semi-flexible pavement, comprising the following components by weight: 100 parts aggregate, 5-10 parts emulsified asphalt, 2-4 parts cement, 1-2 parts waste tire rubber powder, 0.4-0.8 parts waste tire fiber, 0.5-1.5 parts water-based epoxy resin, 0.1-0.5 parts water-based epoxy resin curing agent, 4-8 parts water, and 0-0.25 parts additives.

3. The pavement structure layer for rut repair of guideways according to claim 2, characterized in that, The aggregate is AC-25 type gradation; the emulsified asphalt is cationic slow-setting and slow-curing type with a solid content ≥60%; the cement is 32.5 grade or 42.5 grade silicate cement; the waste tire rubber powder has a particle size of 30 mesh to 60 mesh; the waste tire fiber is fiber generated during the processing of waste tire rubber powder; the waterborne epoxy resin is cationic water-dispersible polyurethane resin with a solid content ≥50%; the waterborne epoxy resin curing agent is water-soluble polyamide adduct with a solid content of 48% to 52%; the additives are powdered aluminate and carbonate cement accelerators.

4. The pavement structure layer for rut repair of guideways according to claim 1, characterized in that, The upper layer is AC-13 or AC-10 type rubber asphalt concrete.

5. A construction process for a pavement structural layer for rutting repair of guideways according to claim 1, characterized in that, This construction process Includes the following steps: The first step is to mill the original road surface of the guide lane. (1) Milling the raised part of the wheel rut The raised part of the rut is the part of the road surface that is higher than the top surface before the rut was formed. After milling it away, the rut depression will be revealed. On the cross section at the widest part of the rut depression, each rut has two boundary points between the rut depression and the original top surface of the road. The parallel line of the road centerline is marked through the two boundary points. The part between the two parallel lines is called the rut depression zone. The other rut depression zone of the same guideway is marked in the same way. (2) The area outside the two rut depressions in the guide lane is called the non-rut depression zone. There are three non-rut depression zones facing the direction of vehicle travel, which are called the left non-rut depression zone, the middle non-rut depression zone and the right non-rut depression zone respectively. The milling thickness of the non-rut depression zone is 3cm, that is, the thickness of the upper layer is a fixed value of 3cm. (3) The original asphalt pavement is completely milled away at the location of the two ruts. The location of the ruts where the original asphalt pavement is completely milled away is called the rut groove. The second step is to connect the crushed stone mixing plant. The third step is to connect the crushed stone transportation. Transport the connecting crushed stone to the site for later use; Step 4: Mix the lower layer of mixture. (1) Mix the emulsified asphalt and water-based epoxy resin and stir evenly for later use; (2) The mixing of the lower layer mixture is carried out on-site by a forced mixer; aggregate → waste tire rubber powder → waste tire fiber → cement are added in sequence and mixed evenly. Then, water → emulsified asphalt and water-based epoxy resin mixture → water-based epoxy resin curing agent → additives are added in sequence and mixed evenly. (3) After the lower layer of mixture is evenly mixed, it is discharged and poured directly into the rut depression groove; Step 5: Laying the lower layer of mixture Spread the lower layer of mixture poured into the rut depression groove and level it. Step 6: Vibrate and compact the lower layer of mixture. The lower layer of mixture is compacted using a plate vibrator; Step 7: Leveling the lower layer of mixture Level the top surface of the compacted lower layer of mixture; Step 8: Spread connecting gravel After the lower layer of mixture is compacted and leveled, the connecting crushed stone is immediately spread, and the connecting crushed stone is required to be spread evenly. Step 9: Vibratory rolling to connect the crushed stone Turn on the roller vibration and roll the spread connecting crushed stone to embed the connecting crushed stone into the lower layer of mixture; After planting the connecting crushed stone, the height difference between the top surface of the original road and the top surface of the lower layer of mixed material should be controlled within the range of 30mm to 32mm; Step 10, Maintenance Moisturize and nourish for at least 12 hours to allow the underlying R layer to... C12 ≥2MPa; Step 11: Mix the top layer of mixture. Step 12, Transportation of the upper layer mixture Step 13: Laying the top layer of mixture The width of the top layer mixture paving is the same as the width of the guide lane; Step 14: Compacting the top layer of mixture. Step 15: Reopen traffic.

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