CAC-20C emulsified asphalt mixture surface layer pavement structure

Abstract

The utility model discloses a CAC -20C emulsified asphalt mixture surface layer pavement structure, including foundation layer, the foundation layer top is provided with the layer of penetration, the layer of penetration top is paved with lower seal coat, lower seal coat top is provided with the heat conduction layer, the heat conduction layer bottom end array installation has multiple groups of heat conduction bar, the heat conduction layer upper end is paved with asphalt layer. Advantageous effects lie in: the utility model discloses a graphene as the material of heat conduction layer and array distribution in heat conduction bar, in the use process, because adopt the graphene as the heat conduction material, can in summer, the heat in asphalt layer is transmitted to the foundation layer through heat conduction bar, and then reduces its road surface temperature, avoids appearing vehicle tire burst, and in winter, the heat in foundation layer can be transmitted to asphalt layer through heat conduction bar and heat conduction layer, and then improves its temperature, avoids its icing, guarantees the traffic safety.

Description

Technical Field

[0001] This utility model relates to the field of road structure technology, specifically to a CAC-20C emulsified asphalt mixture surface layer road structure. Background Technology

[0002] Emulsified asphalt cold-mix CAC-20C asphalt mixture is produced using a continuous process at room temperature, with negligible material loss. The cost of producing 1 ton of emulsified asphalt cold-mix CAC-20C asphalt mixture is 298.4 yuan, while the cost of producing 1 ton of hot-mix AC-20C asphalt mixture is 286.8 yuan. Therefore, based solely on material production costs, the production cost of emulsified asphalt cold-mix CAC-20C asphalt mixture is slightly higher than that of hot-mix AC-20C asphalt mixture. However, producing hot-mix AC-20C asphalt mixture requires higher labor costs, equipment wear and maintenance costs, and costs associated with dust removal and waste powder disposal. Furthermore, its production capacity is significantly lower than cold-mix, and its construction efficiency is lower than CAC-20C, resulting in relatively higher construction costs. Additionally, the production process generates a large amount of dust and harmful gases from heavy oil combustion, causing significant environmental pollution and higher environmental protection costs. The high-temperature construction environment also poses a greater risk to the physical and mental health of workers. Overall, however, their comprehensive costs are roughly equivalent.

[0003] The existing CAC-20C emulsified asphalt mixture pavement structure is greatly affected by the external temperature during use. In summer, the pavement temperature is too high due to insufficient heat dissipation, which can easily cause pavement expansion and cracking, and may also cause tire blowouts. In winter, the pavement temperature is low and can cause icing, affecting driving safety and posing certain safety hazards. Therefore, there is an urgent need for a CAC-20C emulsified asphalt mixture pavement structure to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a CAC-20C emulsified asphalt mixture pavement structure that has good thermal conductivity, avoids high temperature and icing on the road surface, ensures driving safety, and has high performance.

[0006] (II) Technical Solution

[0007] This utility model is achieved through the following technical solution: This utility model proposes a CAC-20C emulsified asphalt mixture surface pavement structure, including a base course, a permeable layer above the base course, a lower sealing layer above the permeable layer, a heat-conducting layer above the lower sealing layer, multiple sets of heat-conducting rods arrayed at the bottom end of the heat-conducting layer, and an asphalt layer laid at the top end of the heat-conducting layer.

[0008] Furthermore, the permeable layer is bonded to the base layer, and the thickness of the permeable layer is 5cm.

[0009] By adopting the above technical solution, after the water-stabilized upper base course on the subgrade has been rolled, shaped, and cured, a tack coat of asphalt is applied while the surface is dry, ensuring good bonding between the asphalt surface layer and the non-asphalt base course. The tack coat uses PC-2 type slow-cracking emulsified asphalt, with a dosage of 1L / m². 2 The depth of penetration of the tack coat into the base layer is confirmed by core drilling, and the penetration depth is not less than 5mm.

[0010] Furthermore, the lower seal layer is bonded to the tack coat, and the material of the lower seal layer is modified asphalt and premixed crushed stone with a size of 9.5-19mm.

[0011] By adopting the above technical solution, the lower sealing layer can seal surface voids and prevent water from seeping into the base layer from the asphalt surface layer, thus ensuring effective overlap between the upper base layer and the asphalt surface layer. Simultaneously, the SBS modified asphalt spraying and the asphalt premixed aggregate spreading are carried out synchronously using a chip sealer in a hot spreading manner. The spread aggregate is 9.5mm–19mm single-size high-quality limestone crushed stone, accounting for 65–75% of the full paving (approximately 10–12 kg / m²). The bridge deck synchronous chip sealer uses 4.75–9.5mm particle size premixed crushed stone, accounting for 60–70% of the full paving. The speed of the spreading vehicle is controlled within 20 km / h. The spreading result must be uniform, with no overlap between particles to prevent interlayer formation, which would result in an excessively thick lower sealing layer affecting interlayer adhesion. This also prevents quality defects such as waves, shoving, and bulging from occurring under braking forces after the asphalt pavement is opened to traffic.

[0012] Furthermore, the thermally conductive layer is bonded to the lower sealing layer, and the material of the thermally conductive layer is graphene.

[0013] By adopting the above technical solution and using graphene as a heat-conducting material, heat in the asphalt layer can be transferred to the subgrade through the heat-conducting rod in summer, thereby reducing the road surface temperature and preventing tire blowouts. In winter, heat in the subgrade can be transferred to the asphalt layer through the heat-conducting rod and the heat-conducting layer, thereby increasing its temperature, preventing it from freezing, and ensuring driving safety.

[0014] Furthermore, the heat-conducting rods are bonded to the heat-conducting layer, and the heat-conducting rods are evenly distributed at the bottom end of the heat-conducting layer.

[0015] By adopting the above technical solution, the heat-conducting rod can not only transfer heat, but also form a road surface skeleton to reinforce the road surface structure and improve its strength.

[0016] Furthermore, the heat-conducting rod penetrates the lower sealing layer and the permeable layer, and the bottom end of the heat-conducting rod is inserted into the base layer.

[0017] Through the above technical solution, the heat-conducting rod can transfer heat.

[0018] Furthermore, the asphalt layer is bonded to the heat-conducting layer, and the thickness of the asphalt layer is 15cm.

[0019] By adopting the above technical solution, the asphalt layer can ensure driving comfort.

[0020] Furthermore, the material of the asphalt layer is cold-mixed CAC-20C emulsified asphalt mixture.

[0021] By adopting the above technical solution, using cold-mix CAC-20C emulsified asphalt mixture to replace the existing hot-mix asphalt mixture has the advantages of virtually no fossil energy consumption and harmful gas emissions, low energy consumption, minimal environmental pollution, simple production process, low construction cost, and fewer supporting equipment. Meanwhile, the CAC-20C emulsified asphalt mixture production mix design uses 9.5–19 mm, 4.75–9.5 mm aggregate, 0–4.75 mm stone chips, and mineral powder, with a synthetic gradation ratio of 55%:20%:23%:20%. The optimal water content is 4.2%, cement content is 1.3% (i.e., 1.8% external water), optimal emulsified asphalt content is 6.6% (i.e., an asphalt-aggregate ratio of 4.2%), and optimal total emulsion content is 8.4%. The asphalt mixture stability, immersion Marshall (48h) residual stability, and dynamic stability all meet the corresponding technical requirements.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, this utility model has the following advantages:

[0024] To address the significant impact of external temperature on existing CAC-20C emulsified asphalt mixture pavement structures during use—specifically, the tendency for excessively high pavement temperatures in summer due to insufficient heat dissipation leading to expansion and cracking, potentially causing tire blowouts—and the risk of icing in winter, which compromises driving safety, this invention utilizes graphene as the heat-conducting layer material and its arrayed distribution on heat-conducting rods. During use, the graphene heat-conducting material transfers heat from the asphalt layer to the subgrade in summer, reducing pavement temperature and preventing tire blowouts. Conversely, in winter, heat from the subgrade is transferred to the asphalt layer via the heat-conducting rods and layer, increasing its temperature and preventing icing, thus ensuring driving safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the CAC-20C emulsified asphalt mixture surface pavement structure described in this utility model;

[0026] Figure 2 This is a bottom view of the heat-conducting layer in the CAC-20C emulsified asphalt mixture pavement structure described in this utility model;

[0027] Figure 3 This is a main sectional view of a CAC-20C emulsified asphalt mixture surface pavement structure according to the present invention.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Subbase; 2. Prime coat; 3. Lower seal coat; 4. Thermal conductive layer; 5. Asphalt layer; 6. Thermal conductive rod. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] like Figures 1-3 As shown in this embodiment, a CAC-20C emulsified asphalt mixture pavement structure includes a base course 1, a permeable layer 2 on top of the base course 1, the permeable layer 2 enhances the adhesion between the base course 1 and the lower seal layer 3, the lower seal layer 3 is laid on top of the permeable layer 2 to improve the pavement's waterproofness, reduce water damage to the pavement, increase the pavement's anti-skid properties, and improve driving safety, a heat-conducting layer 4 is laid on top of the lower seal layer 3, and multiple sets of heat-conducting rods 6 are arrayed at the bottom of the heat-conducting layer 4. Graphene is used as the heat-conducting material, which can transfer the heat in the asphalt layer 5 to the base course 1 in summer through the heat-conducting rods 6, thereby reducing the pavement temperature and preventing vehicle tire blowouts. In winter, the heat in the base course 1 can be transferred to the asphalt layer 5 through the heat-conducting rods 6 and the heat-conducting layer 4, thereby increasing its temperature and preventing it from freezing, ensuring driving safety. The asphalt layer 5 is laid on top of the heat-conducting layer 4, which can ensure driving comfort.

[0032] like Figures 1-3 As shown, in this embodiment, the permeable layer 2 is bonded to the base layer 1, and the thickness of the permeable layer 2 is 5cm. The lower sealing layer 3 is bonded to the permeable layer 2. The material of the lower sealing layer 3 is modified asphalt and premixed crushed stone with a size of 9.5-19mm. The heat-conducting layer 4 is bonded to the lower sealing layer 3. The material of the heat-conducting layer 4 is graphene.

[0033] like Figures 1-3As shown, in this embodiment, the heat-conducting rod 6 is bonded to the heat-conducting layer 4. The heat-conducting rod 6 is evenly distributed at the bottom of the heat-conducting layer 4. The heat-conducting rod 6 penetrates the lower sealing layer 3 and the permeable layer 2. The bottom of the heat-conducting rod 6 is inserted into the base layer 1. The asphalt layer 5 is bonded to the heat-conducting layer 4. The thickness of the asphalt layer 5 is 15cm. The material of the asphalt layer 5 is cold-mixed CAC-20C emulsified asphalt mixture.

[0034] The specific implementation process of this embodiment is as follows: During construction, the base course 1 is first cleaned, and then the tack coat 2 is laid on the base course 1. The laying method is as follows: after the water-stabilized upper base course is rolled, shaped, and cured, the tack coat asphalt is sprayed on the surface while it is dry, so that the asphalt surface layer and the non-asphalt base course are well bonded. The tack coat uses PC-2 type slow-cracking emulsified asphalt, with a dosage of 1L / m. 2 The penetration depth of the tack coat into the base layer is confirmed by core sampling, with a penetration depth of no less than 5mm. Then, contaminants, dust, or debris on tack coat 2 are washed away with a water truck, followed by cleaning with a high-powered forest fire-fighting blower to ensure no contamination or water accumulation. After tack coat 2 has demulsified and its surface is dry, tack coat 3 is applied using a simultaneous tack coat truck. The applied aggregate consists of high-quality limestone crushed stone of 9.5mm–19mm single-size, at a rate of 65–75% of the full coverage (approximately 10–12 kg / m²). 2 For the synchronous application of crushed stone on the bridge deck, premixed crushed stone with a particle size of 4.75–9.5 mm is used, accounting for 60–70% of the full coverage. The spraying is initiated by adjusting the nozzles of the sprayer, with the modified asphalt sprayed in a jetting motion. The temperature is maintained within the range of 165℃–170℃, and the nozzle height is appropriate. During the spraying process, a designated person directs the vehicle to maintain uniform spraying, preventing dripping and ensuring continuous spraying. The crushed stone is evenly distributed, achieving a coverage rate of 70%–80%, ensuring that the crushed stone does not overlap, become loose, pile up, or expose black residue. The synchronous lower sealer should not travel too fast, with the spraying speed controlled within 4 km / h, maintaining a constant speed. The modified asphalt dosage is 2.0–2.2 kg / m³. 2 The amount of crushed stone spread is 11-13 m³ / 1000 m². 2In areas with uneven aggregate distribution, manual sweeping is performed; in areas where asphalt application is insufficient, manual re-application is carried out. The application must be uniform, with no overlap between particles to prevent interlayer formation and excessive thickness of the underlayer seal, which would affect interlayer bonding. To prevent quality defects such as undulation, shoving, and bulging under braking forces after the asphalt pavement is opened to traffic, a road roller follows closely, applying the asphalt at a slow, steady speed for 1-2 passes. After compaction, heat-conducting rods 6 are inserted into the base layer 1, and a heat-conducting layer 4 is laid on its surface before the road roller passes through. After 1-2 passes of compaction, CAC-20C emulsified asphalt mixture is laid on top of the heat-conducting layer 4 and compacted by a road roller. During road use, due to the use of graphene as a heat-conducting material, in summer, the heat in the asphalt layer 5 can be transferred to the base layer 1 through the heat-conducting rod 6, thereby reducing the road surface temperature and preventing vehicle tire blowouts. In winter, the heat in the base layer 1 can be transferred to the asphalt layer 5 through the heat-conducting rod 6 and the heat-conducting layer 4, thereby increasing its temperature, preventing it from freezing and ensuring driving safety.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A CAC-20C emulsified asphalt mixture surface pavement structure, characterized in that: It includes a base layer (1), a permeable layer (2) is provided above the base layer (1), a lower sealing layer (3) is laid above the permeable layer (2), a heat-conducting layer (4) is provided above the lower sealing layer (3), a number of heat-conducting rods (6) are arrayed at the bottom end of the heat-conducting layer (4), and an asphalt layer (5) is laid at the top end of the heat-conducting layer (4).

2. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 1, characterized in that: The permeable layer (2) is bonded to the base layer (1), and the thickness of the permeable layer (2) is 5cm.

3. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 1, characterized in that: The lower seal layer (3) is bonded to the permeable layer (2). The material of the lower seal layer (3) is modified asphalt and premixed crushed stone with a size of 9.5 to 19 mm.

4. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 1, characterized in that: The thermally conductive layer (4) is bonded to the lower sealing layer (3), and the material of the thermally conductive layer (4) is graphene.

5. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 4, characterized in that: The heat-conducting rods (6) are bonded to the heat-conducting layer (4), and the heat-conducting rods (6) are evenly distributed at the bottom end of the heat-conducting layer (4).

6. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 5, characterized in that: The heat-conducting rod (6) penetrates the lower sealing layer (3) and the permeable layer (2), and the bottom end of the heat-conducting rod (6) is inserted into the base layer (1).

7. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 6, characterized in that: The asphalt layer (5) is bonded to the heat-conducting layer (4), and the thickness of the asphalt layer (5) is 15cm.

8. The CAC-20C emulsified asphalt mixture surface pavement structure according to claim 6, characterized in that: The material of the asphalt layer (5) is cold-mixed CAC-20C emulsified asphalt mixture.

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