Road paving structure and construction method thereof

Abstract

The invention relates to a road paving structure and a construction method thereof, and the road paving structure comprises a concrete base layer, a waterproof layer, a hard asphalt lower surface layer, a first bonding layer and an epoxy modified rubber asphalt surface layer which are sequentially arranged from bottom to top; and the void ratio of the epoxy modified rubber asphalt surface layer is 8-18%. Compared with the traditional SMA-13 pavement, the pavement has the beneficial effects that the noise inside and outside the vehicle is obviously reduced at the running speed of 80km / h, the driving experience is optimized, the stability of the pavement reaches the standard in the service period, and the pavement can be popularized and used.

Description

Technical Field

[0001] The invention relates to the technical field of highway construction, and in particular to a road paving structure and a construction method thereof. Background Art

[0002] As an important part of the development of modern transportation infrastructure, noise reduction pavement technology aims to reduce the noise generated by vehicles during driving by improving the surface characteristics of the road. In recent years, significant progress has been made in this field, especially in the use of specific materials and structural designs to achieve exterior sound absorption and noise reduction. However, current technical solutions usually rely on laying a 3-4 cm thick noise reduction functional layer on the road surface, which is mainly composed of coarse aggregates such as basalt. These materials can effectively absorb and scatter the noise generated when the tire contacts the ground. Although this method performs well in reducing external noise pollution, its impact on driving comfort has not been fully appreciated. Due to the presence of coarse aggregates, the roughness of the road surface increases, resulting in increased vibration of the vehicle during driving, which not only affects the driving experience, but may also cause additional wear and tear on the vehicle.

[0003] In addition, the existing noise reduction pavement mostly adopts a large-void open-graded mixture design based on thermoplastic modified asphalt. Although this design helps to improve the noise reduction performance of the pavement, it exposes the problem of insufficient stability under high temperature and heavy load conditions. Specifically, this type of mixture is easy to soften under high temperature conditions, thus causing diseases such as rutting, which seriously affects the service life and service quality of the road. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a road paving structure and a construction method thereof, which solve the technical problems that the noise reduction effect of the existing noise reduction pavement is limited and the pavement stability needs to be improved.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, an embodiment of the present invention provides a road paving structure, comprising a concrete base layer, a waterproof layer, a hard asphalt lower layer, a first bonding layer and an epoxy-modified rubber asphalt surface layer arranged in sequence from bottom to top; the porosity of the epoxy-modified rubber asphalt surface layer is 8-18%.

[0009] As a preferred embodiment of the present invention, the road paving structure, the epoxy modified rubber asphalt surface layer comprises a large void epoxy modified rubber asphalt layer, the void ratio of which is 14-18%;

[0010] The large-void epoxy-modified rubber asphalt layer comprises, by mass, 4-6 parts of the first epoxy-modified asphalt, 40-45 parts of porous steel slag, 55-58 parts of bauxite, 0.1-0.3 parts of polypropylene fiber and 2-5 parts of rubber powder;

[0011] Among them, the maximum nominal particle size of porous steel slag and bauxite is ≥16mm;

[0012] The first epoxy modified asphalt comprises, by weight: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 65-75 parts of SBS modified asphalt;

[0013] The large-void epoxy-modified rubber asphalt layer has a thickness of 4-6 cm.

[0014] As a preferred embodiment of the present invention, the road paving structure, the epoxy modified rubber asphalt surface layer further comprises a second bonding layer and a small particle size epoxy modified rubber asphalt layer sequentially arranged on the large void epoxy modified rubber asphalt layer from bottom to top;

[0015] The porosity of the small-particle epoxy-modified rubber asphalt layer is 8-14%.

[0016] As a preferred embodiment of the present invention, the road paving structure,

[0017] The small-particle epoxy-modified rubber asphalt layer comprises, by mass, 5-7 parts of a second epoxy-modified asphalt, 22-25 parts of porous basalt, 70-75 parts of porous steel slag, 3-7 parts of rubber powder and 0.1-0.3 parts of polypropylene fiber;

[0018] Alternatively, the small-particle epoxy modified asphalt layer includes, by mass, 5-7 parts of second epoxy modified asphalt, 90-95 parts of basalt, 3-7 parts of limestone powder and 0.1-0.3 parts of polypropylene fiber; wherein the basalt is ordinary basalt without being porous treated.

[0019] Among them, the maximum nominal particle size of basalt, porous basalt and porous steel slag is less than 9.5 mm;

[0020] The second epoxy modified asphalt comprises the following components: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer and 70-80 parts of SBS modified asphalt;

[0021] The thickness of the small-particle epoxy-modified rubber asphalt layer is 2-4 cm.

[0022] As a preferred embodiment of the present invention, the road pavement structure further includes a damping stress absorption layer and a third bonding layer between the waterproof layer and the hard asphalt lower layer from bottom to top;

[0023] The thickness of the damping stress absorbing layer is 1.5-2.5 cm, and the damping stress absorbing layer comprises, by mass, 12-15 parts of the third epoxy modified asphalt, 20-23 parts of limestone coarse aggregate, 40-44 parts of limestone fine aggregate, 35-38 parts of 20 mesh rubber particles, and 6-9 parts of 150 mesh rubber powder;

[0024] The third epoxy modified asphalt comprises, by mass, 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-2 parts of neopentyl glycol diglycidyl ether, 3-5 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 60-70 parts of SBS modified asphalt.

[0025] Among them, limestone fine aggregate and limestone coarse aggregate are divided by a particle size of 2.36 mm according to the current national standard. Particle sizes less than or equal to 2.36 mm are fine aggregates, and particle sizes greater than 2.36 mm are coarse aggregates.

[0026] As a preferred embodiment of the present invention, in the road paving structure, the waterproof layer is one of a permeable resin sealing layer and a non-stick wheel emulsified asphalt bonding layer.

[0027] As a preferred embodiment of the present invention, the road paving structure,

[0028] The permeable resin sealing layer is formed by coating a mixture of permeable resin and curing agent B, with a coating amount of 0.3-0.5 kg / m 2 , thickness is 1-2mm;

[0029] The coating amount of the non-stick wheel emulsified asphalt bonding layer is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm.

[0030] As a preferred embodiment of the present invention, in the road pavement structure, the bonding layer is epoxy modified rubber asphalt or non-stick wheel emulsified asphalt;

[0031] The epoxy modified rubber asphalt comprises, by weight: 45-55 parts of fourth epoxy modified asphalt, 35-45 parts of 200 mesh rubber powder and 0.5-1 part of calcium oxide;

[0032] The fourth epoxy modified asphalt comprises, by weight: 40-55 parts of linear phenolic polyglycidyl ether, 2-5 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 70-75 parts of SBS modified asphalt;

[0033] The coating amount of the bonding layer is 0.5-0.6 kg / m 2 , thickness is 0.5-0.6mm.

[0034] As a preferred embodiment of the present invention, in the road pavement structure, the hard asphalt lower layer is hard high-strength asphalt or epoxy-modified hard high-strength asphalt;

[0035] The hard high-strength asphalt comprises, by mass: 3-5 parts of 70# base asphalt, 1-2 parts of hard asphalt and 90-95 parts of limestone;

[0036] The epoxy modified hard high strength asphalt comprises, by weight: 3-5 parts of fifth epoxy modified asphalt, 1-2 parts of hard asphalt, 85-95 parts of bauxite and 2-4 parts of limestone powder.

[0037] Wherein, the fifth epoxy modified asphalt comprises, by weight: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer and 63-73 parts of 70# base asphalt;

[0038] The thickness of the lower layer of hard asphalt is 5-8cm.

[0039] It should be noted that among the above materials, the water absorption rates of porous steel slag, bauxite, and porous basalt are 1.81%, 1.7%, and 1.92%, respectively, which are used to characterize their porosity as aggregates for road engineering. Compared with porous basalt, basalt is common porous basalt, and its structure is usually denser, with almost no obvious pores or pores. The particle size of limestone powder is less than 0.075mm. If there is any unclear explanation for the above materials, refer to the standard explanation of the materials used in the prior art.

[0040] In a second aspect, an embodiment of the present invention provides a construction method of the road pavement structure according to the first aspect, comprising the following steps:

[0041] S1. Mill the upper surface of the concrete base with a milling depth of 1-2 mm, and then shot blast the milling interface;

[0042] S2. Apply a waterproof layer on the surface of the cleaned concrete base;

[0043] S3. Lay a hard asphalt lower layer on the upper surface of the waterproof layer;

[0044] S4. After the curing of the hard asphalt lower layer is completed, a first bonding layer is applied on its upper surface, and then an epoxy modified rubber asphalt surface layer is paved on the upper surface of the first bonding layer.

[0045] (III) Beneficial effects

[0046] The beneficial effects of the present invention are as follows: a road pavement structure and a construction method thereof of the present invention, due to the concrete base, waterproof layer, hard asphalt lower layer, first bonding layer and epoxy modified rubber asphalt surface layer arranged in sequence from bottom to top, the porosity of the epoxy modified rubber asphalt surface layer is 8-18%. Under the combination of the hard asphalt lower layer and the epoxy modified rubber asphalt surface layer, the use of the hard asphalt lower layer improves the overall strength and durability of the pavement structure, especially by increasing the modulus of the lower layer (i.e., the stiffness or elastic modulus of the material), it helps to better distribute the traffic load, reduce the deformation of the base and the soil base, and thus extend the service life of the pavement; the epoxy modified rubber asphalt surface layer has vibration reduction and noise reduction and sound absorption and noise reduction functions due to its large porosity, and the use of epoxy modified rubber asphalt makes the structure have both vibration reduction functionality and durability. Compared with the prior art, at a driving speed of 80km / h, the noise inside and outside the vehicle is significantly reduced relative to the traditional SMA-13 ​​pavement, the driving experience is optimized, the pavement stability during service meets the standards, and can be promoted for use.

[0047] The large-void epoxy-modified rubber asphalt layer is composed of epoxy-modified rubber asphalt, porous steel slag aggregate and bauxite aggregate, and has vibration reduction and noise reduction and sound absorption and noise reduction functions. The use of epoxy-modified rubber asphalt makes the structure have both vibration reduction functionality and durability. The use of two high-strength and porous aggregates, porous steel slag and bauxite, combined with a large-void grading design, improves the sound absorption effect and makes the binder and aggregate tightly combined. The use of highly elastic, high-strength and almost non-water-absorbent polypropylene fibers to enhance the toughness and strength of the mixture solves the problem that the water absorption of conventional lignin fibers leads to poor water damage resistance of large-void asphalt mixtures. Through the optimal combination design of binder, aggregate and fiber, the functionality and durability of the large-void epoxy-modified rubber asphalt layer are synergistically improved.

[0048] On the basis of the large-void epoxy-modified rubber asphalt layer (middle surface layer), a small-particle epoxy-modified rubber asphalt upper layer is set, which is composed of epoxy-modified rubber asphalt, porous basalt aggregate and porous steel slag aggregate. The small-particle design is adopted to optimize the smoothness of the road texture, which can effectively reduce the tire vibration when the vehicle passes, thereby greatly reducing the driving noise. At the same time, the mixture also has a certain amount of voids, and the use of porous aggregates has the effect of sound absorption and noise reduction. The use of polypropylene fiber further strengthens and toughens the structure and improves the resistance to water damage. Through the differentiated combination of the void size of the middle surface layer and the upper surface layer, starting from the contact surface with the outside world, the probability of void clogging is reduced, and the problem of short maintenance time of noise reduction functionality due to excessive voids and easy clogging when the traditional open-graded mixture is applied to the surface layer is solved.

[0049] The high damping stress absorption layer forms an effective vibration reduction buffer layer by using epoxy modified rubber asphalt and graded coarse limestone aggregate and rubber particles, which plays a role in protecting the cement concrete base layer. At the same time, it effectively absorbs the structural vibration generated during the passage of vehicles, thereby reducing the vibration noise during driving, achieving the dual effects of impact resistance and noise reduction of the base layer.

[0050] The permeable resin sealing layer can penetrate into the micro-cracks of the underlying concrete slab through capillary action, playing a role in healing and reinforcing, while forming a waterproof bonding layer, playing a connecting role.

[0051] The epoxy-modified rubber asphalt bonding layer has excellent interlayer bonding effect through composite modification of epoxy and rubber. It can make the upper and lower epoxy systems form an organic combination through cross-linking reaction, ensure close bonding between layers, avoid defects such as shifting during use, and improve the overall service life of the pavement. It also has a certain vibration reduction effect through rubber modification.

[0052] The hard asphalt bottom layer uses epoxy modified hard asphalt high strength bottom layer, which is composed of epoxy modified hard asphalt binder and high strength bauxite aggregate. The epoxy modification improves the toughness of hard asphalt, and combined with the bottom high damping stress absorption layer, it can effectively solve the problem that high modulus hard asphalt mixture has high strength but easy to crack, and has higher structural strength and durability, ensuring the service life of the bottom layer. At the same time, bauxite aggregate has good surface texture pores, which further improves the strength and stability of the mixture and forms a permanent bottom layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a schematic diagram of the road paving structure in Example 4 of the present invention.

[0054] [Description of Reference Numerals]

[0055] 1: Concrete base; 2: Permeable resin sealing layer; 3: Damping stress absorption layer; 4: Epoxy modified rubber asphalt bonding layer; 5: Epoxy modified hard asphalt high-strength bottom layer; 6: Large void epoxy modified rubber asphalt layer; 7: Small particle size epoxy modified rubber asphalt layer. DETAILED DESCRIPTION

[0056] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0057] The road pavement structure and construction method of the present invention proposed in the embodiment of the present invention are aimed at the technical problems that the noise reduction effect of the existing noise reduction pavement is limited and the pavement stability needs to be improved; wherein, the road pavement structure has a concrete base layer, a waterproof layer, a hard asphalt lower layer, a first bonding layer and an epoxy modified rubber asphalt surface layer arranged in sequence from bottom to top, and the porosity of the epoxy modified rubber asphalt surface layer is 8-18%. Under the combination of the hard asphalt lower layer and the epoxy modified rubber asphalt surface layer, the use of the hard asphalt lower layer improves the overall strength and durability of the pavement structure, especially by increasing the modulus of the lower layer (i.e., the stiffness or elastic modulus of the material), which helps to better distribute the traffic load, reduce the deformation of the base and the soil base, and thus extend the service life of the pavement; the epoxy modified rubber asphalt surface layer has the functions of vibration reduction and noise reduction and sound absorption and noise reduction due to its large porosity, and the use of epoxy modified rubber asphalt makes the structure have both vibration reduction functionality and durability. Compared with existing technologies, at a driving speed of 80km / h, the noise inside and outside the vehicle is significantly reduced compared to traditional SMA-13 ​​pavement, the driving experience is optimized, the pavement stability meets the standards during service, and can be promoted for use.

[0058] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0059] In a specific embodiment of the present invention, the sources of various commercially available materials are as follows:

[0060]

[0061]

[0062] Example 1

[0063] The present embodiment provides a road paving structure, which includes, from bottom to top: a cement concrete base layer, a non-stick wheel emulsified asphalt bonding layer (with both bonding and waterproofing functions), a hard asphalt high-strength bottom layer, a non-stick wheel emulsified asphalt bonding layer (first bonding layer) and a large-void epoxy-modified rubber asphalt layer.

[0064] Among them, the coating amount of the non-stick wheel emulsified asphalt bonding layer is 0.5-0.6kg / m 2 , thickness is 0.5-0.6mm, and non-stick wheel emulsified asphalt is a commercially available product.

[0065] The hard asphalt high-strength lower layer is 5-8cm thick and its components, calculated by mass, include 3-5 parts of 70# base asphalt, 1-2 parts of hard asphalt, and 90-95 parts of limestone aggregate;

[0066] The coating amount of the non-stick wheel emulsified asphalt bonding layer is 0.5-0.6kg / m 2 , thickness is 0.5-0.6mm;

[0067] The large-void epoxy modified asphalt layer has a thickness of 4-6 cm and a porosity of 14-18%. Its components, calculated by mass, include 4-6 parts of epoxy modified asphalt, 90-96 parts of basalt aggregate, 2-4 parts of limestone powder, and 0.1-0.3 parts of lignin fiber. Among them, the components of the epoxy modified asphalt, calculated by mass, include 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer, and 65-75 parts of SBS modified asphalt.

[0068] Example 2

[0069] This embodiment provides a construction method of the road pavement structure in Embodiment 1, which is specifically as follows:

[0070] (1) Perform ultra-fine milling on the upper surface of the concrete base, and then use a hot blower to blow it to ensure that the concrete surface after milling is dry, dust-free, and free of foreign matter;

[0071] (2) Use anti-pollution tape to define the working area, and use a spray gun to evenly apply the non-stick wheel emulsified asphalt bonding layer. The spraying temperature is 160℃±5℃, and the amount is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0072] (3) After the waterproof bonding layer is applied, the hard asphalt high-strength bottom layer shall be constructed immediately. The mixing temperature of the mixture shall be 160℃±5℃, the paving speed shall be 2-3m / min, the initial compaction shall be performed by a double steel wheel roller with static front and vibration back for 1-2 times, the secondary compaction shall be performed by a rubber wheel roller with static compaction for 1-2 times, and the final compaction shall be performed by a double steel wheel roller with static compaction for 2-3 times;

[0073] (4) Spray the non-stick wheel emulsified asphalt bonding layer on the hard asphalt high-strength bottom layer by mechanical spraying. The spraying temperature is 160℃±5℃ and the dosage is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0074] (5) A large-void epoxy modified asphalt layer is laid on the non-stick wheel emulsified asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, the paving speed is 2-3m / min, and the initial compaction is performed by a double steel wheel roller with static compaction 1-2 times in front and vibration in the back. The secondary compaction is performed by static compaction 1-2 times with a rubber wheel roller, and the final compaction is performed by static compaction 1-2 times with a double steel wheel roller to complete the construction.

[0075] The pavement structure provided in Example 1 is combined with the construction method of Example 2 to form a pavement structure. The performance of the pavement structure is tested using the method in Table 1 with reference to the traditional SMA-13 ​​pavement. The test results are detailed in Table 1: Using a combination of a high-strength lower layer and a large-void upper layer, at a driving speed of 80 km / h, the noise inside the vehicle is reduced by 1 dB, and the noise outside the vehicle is reduced by 3 dB relative to the traditional SMA-13 ​​pavement.

[0076] Example 3

[0077] The present embodiment provides a road pavement structure, which includes, from bottom to top, a cement concrete base layer, a permeable resin sealing layer, an epoxy-modified hard asphalt high-strength bottom layer, a non-stick wheel emulsified asphalt bonding layer and a small-particle epoxy-modified rubber asphalt top layer.

[0078] The permeable resin sealing layer is formed by mixing the permeable resin and the curing agent B in a volume ratio of 4:1, and the coating amount is 0.3-0.5kg / m 2 , thickness is 1-2mm;

[0079] The thickness of the high-strength lower layer of epoxy modified hard asphalt is 5-8cm, and its components, by weight, include 4.5 parts of epoxy modified asphalt, 1-2 parts of hard asphalt, 85-95 parts of bauxite aggregate, and 2-5 parts of limestone powder. Among them, the components of epoxy modified asphalt, by weight, include 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer, and 63-73 parts of 70# base asphalt;

[0080] The coating amount of the non-stick wheel emulsified asphalt bonding layer is 0.5-0.6kg / m 2 , thickness is 0.5-0.6mm;

[0081] The thickness of the small-particle epoxy modified asphalt layer is 2-4 cm, the porosity is 8-14%, and the small-particle epoxy modified asphalt layer includes 5-7 parts of epoxy modified asphalt, 90-95 parts of basalt aggregate, 3-7 parts of limestone powder and 0.1-0.3 parts of polypropylene fiber by weight. Among them, the epoxy modified asphalt includes the following components by weight: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer and 70-80 parts of SBS modified asphalt.

[0082] Example 4

[0083] This embodiment provides a construction method of the road pavement structure in Embodiment 3, which is as follows:

[0084] (1) Ultra-fine milling of the concrete base, vacuum shot blasting of the milling interface, and then use a hot blower to blow it to ensure that the concrete surface after milling is dry, dust-free and free of foreign matter;

[0085] (2) Use anti-pollution tape to define the working area, and evenly apply the permeable resin by spraying or manual scraping;

[0086] (3) 3 hours after the permeable resin construction is completed, the epoxy modified hard asphalt high-strength bottom layer shall be constructed immediately. The mixing temperature of the mixture shall be 165℃±5℃, the paving speed shall be 2-3m / min, the initial compaction shall be done by a double steel wheel roller with static front and vibration back for 1-2 times, the secondary compaction shall be done by a rubber wheel roller with static compaction for 1-2 times, and the final compaction shall be done by a double steel wheel roller with static compaction for 2-3 times;

[0087] (4) Spray the non-stick wheel emulsified asphalt bonding layer on the high-strength lower layer of epoxy modified hard asphalt by mechanical spraying. The spraying temperature is 160℃±5℃ and the dosage is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0088] (5) A small-size epoxy modified rubber asphalt layer is laid on the non-stick wheel emulsified asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, and the paving speed is 2-3m / min. The initial compaction is performed by using a double steel wheel roller with static compaction for 1-2 times in front and vibration for 2-3 times in back. The secondary compaction is performed by using a rubber wheel roller with static compaction for 2-3 times. The final compaction is performed by using a double steel wheel roller with static compaction for 2-3 times to complete the construction.

[0089] The pavement structure provided in Example 3 is combined with the construction method of Example 4 to form a pavement structure. The performance test of the pavement structure is carried out using the method of Table 1 with reference to the unified SMA-13 ​​pavement. The test results are detailed in Table 1: The pavement structure provided in this Example 3 enhances the strength of the waterproof bonding layer relative to Example 1, introduces epoxy materials to toughen the lower layer, and uses high-strength aluminum alum aggregate to strengthen the lower layer. At the same time, the particle size design of the upper layer is refined, and the degree of rolling of the upper layer during construction is improved, making the upper layer smoother and less prone to clogging. At a driving speed of 80km / h, the noise inside the car is reduced by 3dB relative to the traditional SMA-13 ​​pavement, but due to the increase in the number of rolling times and the fine particle size design, the void ratio and structural depth of the mixture are reduced, and the noise reduction effect outside the car is not as good as that of Example 1, with a noise reduction effect of 2dB, and other road performances are all good. After one year of service, this structure has significantly reduced cracking diseases compared with Example 1.

[0090] Example 5

[0091] The present embodiment provides a road pavement structure, which includes, from bottom to top: a cement concrete base layer, a permeable resin sealing layer, an epoxy-modified hard asphalt high-strength bottom layer, an epoxy-modified rubber asphalt bonding layer, a large-void epoxy-modified rubber asphalt middle surface layer, an epoxy-modified rubber asphalt bonding layer, and a small-particle epoxy-modified rubber asphalt top layer.

[0092] Wherein, the permeable resin sealing layer is the same as that in Example 3;

[0093] The epoxy modified hard asphalt high strength bottom layer is the same as that in Example 3;

[0094] The coating amount of epoxy modified rubber asphalt bonding layer is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm; the epoxy modified rubber asphalt bonding layer includes 45-55 parts of epoxy modified asphalt, 35-45 parts of 200 mesh rubber powder and 0.5-1 part of calcium oxide by weight; wherein, the epoxy modified asphalt includes: 40-55 parts of linear phenolic polyglycidyl ether, 2-5 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 70-75 parts of SBS modified asphalt by weight;

[0095] The large-void epoxy-modified rubber asphalt middle surface layer is the same as that in Example 1;

[0096] The thickness of the small-particle epoxy modified rubber asphalt top layer is 2-4cm, and the porosity is 8-14%. The small-particle epoxy modified rubber asphalt top layer includes 5-7 parts of epoxy modified asphalt, 22-25 parts of porous basalt, 70-75 parts of porous steel slag aggregate, 3-7 parts of rubber powder, and 0.1-0.3 parts of polypropylene fiber. The epoxy modified asphalt includes the following components: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer, and 70-80 parts of SBS modified asphalt;

[0097] Example 6

[0098] This embodiment provides a construction method of the road pavement structure in Embodiment 5, which is as follows:

[0099] Steps (1) to (3) are the same as in Example 4;

[0100] (4) Spray the epoxy modified rubber asphalt bonding layer on the epoxy modified hard asphalt high strength bottom layer by mechanical spraying, the spraying temperature is 160℃±5℃, the dosage is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0101] (5) Pave the large-void epoxy modified rubber asphalt middle surface layer on the epoxy modified rubber asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, the paving speed is 2m-3m / min, the initial compaction is performed by a double steel wheel roller with static front and vibration back for 1-2 times, the secondary compaction is performed by a rubber wheel roller with static compaction for 1-2 times, and the final compaction is performed by a double steel wheel roller with static compaction for 1-2 times;

[0102] (6) Mechanical spraying is used to spray the epoxy modified rubber asphalt bonding layer on the large void epoxy modified rubber asphalt middle surface layer. The spraying temperature is 160℃±5℃ and the dosage is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0103] (7) Pave the small-particle epoxy modified rubber asphalt top layer on the epoxy modified rubber asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, the paving speed is 2-3m / min, and the initial compaction is performed by a double steel wheel roller with static compaction for 1-2 times and then vibration compaction. The secondary compaction is performed by static compaction for 2-3 times with a rubber wheel roller, and the final compaction is performed by static compaction for 2-3 times with a double steel wheel roller.

[0104] The pavement structure provided in Example 5 is combined with the construction method of Example 6 to form a pavement structure. The performance test of the pavement structure is carried out using the method in Table 1, with reference to the unified SMA-13 ​​pavement. The test results are shown in Table 1: The pavement structure provided in Example 5 introduces epoxy-modified rubber asphalt material relative to Example 3 to further enhance the strength of the bonding layer and the vibration reduction performance of the overall structure, and uses high-strength aggregate (lower layer) and porous aggregate (middle layer and upper layer) to enhance the strength of the structural layer and the sound absorption and noise reduction effect. The double-layer void structure (middle layer and upper layer) is combined to have both sound absorption and vibration reduction effects.

[0105] In addition, in Example 5, compared with Example 3, the ordinary basalt aggregate is replaced with porous basalt and porous steel slag aggregate, which further strengthens the micro-voids on the aggregate surface and thus enhances the sound absorption effect. Rubber powder is added to the binder to enhance the vibration reduction performance of the mixture.

[0106] Based on the above, the pavement structure of Example 5 reduces the noise inside the vehicle by 4dB and the noise outside the vehicle by 4dB at a driving speed of 80km / h compared with the traditional SMA-13 ​​pavement.

[0107] The epoxy-modified rubber asphalt bonding layer has stronger bonding strength and shear strength than the non-stick wheel emulsified asphalt, and the dynamic stability at 60°C is significantly improved. Example 5 optimizes the interlayer displacement disease relative to Example 3, and further enhances the structural durability and noise reduction functionality.

[0108] Example 7

[0109] This embodiment provides a road paving structure, referring to Figure 1 , from bottom to top, it includes: cement concrete base 1, permeable resin sealing layer 2, damping stress absorption layer 3, epoxy modified rubber asphalt bonding layer 4, epoxy modified hard asphalt high-strength lower layer 4, epoxy modified rubber asphalt bonding layer 4, large-void epoxy modified rubber asphalt middle surface layer 6, epoxy modified rubber asphalt bonding layer 4 and small-particle epoxy modified rubber asphalt upper layer 7.

[0110] The difference between this embodiment and embodiment 5 is that:

[0111] The thickness of the damping stress absorption layer is 1.5-2.5 cm. The raw materials of the damping stress absorption layer include 12-15 parts of epoxy modified asphalt, 20-23 parts of coarse limestone aggregate, 40-44 parts of fine limestone aggregate, 35-38 parts of 20 mesh rubber particles, and 6-9 parts of 150 mesh rubber powder. The epoxy modified asphalt includes the following components by mass: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-2 parts of neopentyl glycol diglycidyl ether, 3-5 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer and 60-70 parts of SBS modified asphalt.

[0112] The other structural layers are the same as those in Example 5.

[0113] Example 8

[0114] This embodiment provides a construction method of the road pavement structure in Embodiment 7, which is as follows:

[0115] Steps (1) and (2) are the same as in Example 6;

[0116] (3) 3 hours after the permeable resin construction is completed, the damping stress absorption layer is constructed. The mixing temperature of the mixture is 160℃±5℃, the paving speed is 2-2.5m / min, and a double steel wheel roller is used for 1-2 times of static front and vibration rear.

[0117] (4) Spray the epoxy modified rubber asphalt bonding layer on the damping stress absorption layer by mechanical spraying, the spraying temperature is 160℃±5℃, the dosage is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0118] (5) Carry out the construction of epoxy modified hard asphalt high-strength bottom layer on the epoxy modified rubber asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, the paving speed is 2-3m / min, the initial compaction is carried out by a double steel wheel roller with static front and vibration back for 1-2 times, the secondary compaction is carried out by static compaction with a rubber wheel roller for 1-2 times, and the final compaction is carried out by static compaction with a double steel wheel roller for 2-3 times;

[0119] (6) Spray the epoxy modified rubber asphalt bonding layer on the epoxy modified hard asphalt high strength bottom layer by mechanical spraying, the spraying temperature is 160℃±5℃, the dosage is 0.5-0.6kg / m 2 , spraying thickness 0.5-0.6mm;

[0120] (7) Pave the large-void epoxy modified rubber asphalt middle surface layer on the epoxy modified rubber asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, the paving speed is 2-3m / min, the initial compaction is performed by a double steel wheel roller with static front and vibration back for 1-2 times, the secondary compaction is performed by a rubber wheel roller with static compaction for 1-2 times, and the final compaction is performed by a double steel wheel roller with static compaction for 1-2 times;

[0121] (8) Mechanical spraying is used to spray the epoxy modified rubber asphalt bonding layer on the large void epoxy modified rubber asphalt middle surface layer. The spraying temperature is 160℃±5℃ and the dosage is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm;

[0122] (9) Pave the small-particle epoxy modified rubber asphalt top layer on the epoxy modified rubber asphalt bonding layer. The mixing temperature of the mixture is 165℃±5℃, the paving speed is 2-3m / min, and the initial compaction is performed by a double steel wheel roller with static compaction for 1-2 times and then vibration compaction. The secondary compaction is performed by static compaction for 2-3 times with a rubber wheel roller, and the final compaction is performed by static compaction for 2-3 times with a double steel wheel roller.

[0123] The pavement structure provided in Example 7 is formed by the construction method of Example 8. With the SMA-13 ​​pavement as a reference, the pavement structure is performance tested using the method in Table 1. The test results are detailed in Table 1: The pavement structure provided in this embodiment adds a high-damping stress absorption layer relative to Example 5, which solves the problem of stress concentration and easy cracking in the lower layer, and further enhances the vibration reduction and noise reduction performance of the structure. Compared with the traditional SMA-13 ​​pavement, the noise inside the vehicle is reduced by 4dB, and the noise outside the vehicle is reduced by 5dB.

[0124] The epoxy modified noise reduction asphalt pavement structure of the present invention can achieve comprehensive noise reduction inside and outside the vehicle through overall coordination and cooperation, and the comprehensive noise reduction is more than 5 decibels compared with the conventional AC-13 pavement, and has excellent durability. While achieving the road noise reduction effect, it ensures that the road surface has good high temperature stability and durability.

[0125] Table 1 Pavement structure performance test results

[0126]

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A road paving structure, characterized in that: It includes a concrete base layer, a waterproof layer, a hard asphalt lower layer, a first bonding layer and an epoxy modified rubber asphalt surface layer which are arranged in sequence from bottom to top; The void ratio of epoxy modified rubber asphalt surface layer is 8-18%.

2. The road paving structure according to claim 1, characterized in that: The epoxy modified rubber asphalt surface layer comprises a large void epoxy modified rubber asphalt layer, the void ratio of which is 14-18%; The large-void epoxy-modified rubber asphalt layer comprises, by mass, 4-6 parts of the first epoxy-modified asphalt, 40-45 parts of porous steel slag, 55-58 parts of bauxite, 0.1-0.3 parts of polypropylene fiber and 2-5 parts of rubber powder; Among them, the maximum nominal particle size of porous steel slag and bauxite is ≥16mm; The first epoxy modified asphalt comprises, by weight: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 65-75 parts of SBS modified asphalt; The large-void epoxy-modified rubber asphalt layer has a thickness of 4-6 cm.

3. The road paving structure according to claim 2, characterized in that: The epoxy modified rubber asphalt surface layer further comprises a second bonding layer and a small particle size epoxy modified rubber asphalt layer which are sequentially arranged on the large void epoxy modified rubber asphalt layer from bottom to top; The porosity of the small-particle epoxy-modified rubber asphalt layer is 8-14%.

4. The road paving structure according to claim 3, characterized in that: The small-particle epoxy-modified rubber asphalt layer comprises, by mass, 5-7 parts of a second epoxy-modified asphalt, 22-25 parts of porous basalt, 70-75 parts of porous steel slag, 3-7 parts of rubber powder and 0.1-0.3 parts of polypropylene fiber; Alternatively, the small-particle epoxy modified asphalt layer comprises, by mass, 5-7 parts of a second epoxy modified asphalt, 90-95 parts of basalt, 3-7 parts of limestone powder, and 0.1-0.3 parts of polypropylene fiber; Among them, the maximum nominal particle size of basalt, porous basalt and porous steel slag is less than 9.5 mm; The second epoxy modified asphalt comprises the following components: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer and 70-80 parts of SBS modified asphalt; The thickness of the small-particle epoxy-modified rubber asphalt layer is 2-4 cm.

5. The road paving structure according to claim 1, characterized in that: A damping stress absorbing layer and a third bonding layer are also included between the waterproof layer and the hard asphalt lower layer from bottom to top; The thickness of the damping stress absorbing layer is 1.5-2.5 cm, and the damping stress absorbing layer comprises, by mass, 12-15 parts of the third epoxy modified asphalt, 20-23 parts of limestone coarse aggregate, 40-44 parts of limestone fine aggregate, 35-38 parts of 20 mesh rubber particles, and 6-9 parts of 150 mesh rubber powder; The third epoxy modified asphalt comprises, by mass, 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-2 parts of neopentyl glycol diglycidyl ether, 3-5 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 60-70 parts of SBS modified asphalt.

6. The road paving structure according to claim 1, characterized in that: The waterproof layer is one of a permeable resin sealing layer and a non-stick wheel emulsified asphalt bonding layer.

7. The road paving structure according to claim 6, characterized in that: The permeable resin sealing layer is formed by coating a mixture of permeable resin and curing agent B, with a coating amount of 0.3-0.5 kg / m 2 , thickness is 1-2mm; The coating amount of the non-stick wheel emulsified asphalt bonding layer is 0.5-0.6kg / m 2 , coating thickness 0.5-0.6mm.

8. The road paving structure according to any one of claims 1 to 5, characterized in that: The bonding layer is epoxy modified rubber asphalt or non-stick wheel emulsified asphalt; The epoxy modified rubber asphalt comprises, by weight: 45-55 parts of fourth epoxy modified asphalt, 35-45 parts of 200 mesh rubber powder and 0.5-1 part of calcium oxide; The fourth epoxy modified asphalt comprises, by weight: 40-55 parts of linear phenolic polyglycidyl ether, 2-5 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinker, 1-2 parts of compatibilizer and 70-75 parts of SBS modified asphalt; The coating amount of the bonding layer is 0.5-0.6 kg / m 2 , thickness is 0.5-0.6mm.

9. The road paving structure according to claim 1, characterized in that: The lower layer of the hard asphalt is hard high-strength asphalt or epoxy-modified hard high-strength asphalt; The hard high-strength asphalt comprises, by mass: 3-5 parts of 70# base asphalt, 1-2 parts of hard asphalt and 90-95 parts of limestone; The epoxy modified hard high strength asphalt includes, by weight: 3-5 parts of fifth epoxy modified asphalt, 1-2 parts of hard asphalt, 85-95 parts of bauxite and 2-4 parts of limestone powder; Wherein, the fifth epoxy modified asphalt comprises, by weight: 20-25 parts of bisphenol A epoxy resin, 1-2 parts of polyphenylmethane polyisocyanate, 1-3 parts of neopentyl glycol diglycidyl ether, 3-6 parts of diamine chain extender crosslinking agent, 1-2 parts of compatibilizer and 63-73 parts of 70# base asphalt; The thickness of the lower layer of hard asphalt is 5-8cm.

10. A construction method for a road pavement structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Mill the upper surface of the concrete base with a milling depth of 1-2 mm, and then shot blast the milling interface; S2. Apply a waterproof layer on the surface of the cleaned concrete base; S3. Lay a hard asphalt lower layer on the upper surface of the waterproof layer; S4. After the curing of the hard asphalt lower layer is completed, a first bonding layer is applied on its upper surface, and then an epoxy modified rubber asphalt surface layer is paved on the upper surface of the first bonding layer.

Images