Long-life durable cement concrete bridge deck asphalt pavement layer and construction method thereof

Abstract

The invention belongs to the technical field of road engineering, and particularly relates to a long-service-life durable cement concrete asphalt pavement layer and a construction method thereof.The long-service-life durable cement concrete asphalt pavement layer sequentially comprises a seepage bonding layer, an anti-crack layer, an anti-fatigue waterproof layer, a bearing layer, a waterproof bonding layer and a wearing layer from bottom to top; the method is mainly used for solving the problems of poor flatness, ruts, pushing, upheaval, looseness, pit slots, slurry pumping and whitening, poor skid resistance and durability and the like of a cement concrete pavement layer.

Description

Technical Field

[0001] The present invention belongs to the field of road engineering technology and relates to a cement concrete bridge deck asphalt pavement layer, and in particular to a long-life durable cement concrete asphalt pavement layer and a construction method thereof, which is mainly used to solve the problems of poor flatness, rutting, displacement, bulging, looseness, potholes, whitening due to pumping, poor anti-skid performance and durability that are prone to occur in cement concrete pavement layers. Technical Background

[0002] After the beams of concrete bridges are constructed, cement concrete and asphalt pavement layers are laid. The cement concrete pavement layer is used to control the bridge's elevation and provide waterproofing and corrosion protection. The asphalt pavement layer distributes wheel loads, protects the main beams from rainwater and other harmful substances, and prevents direct wheel wear on the roadway slab. Therefore, the quality and durability of the bridge's asphalt pavement layer directly impacts both the ride quality of vehicles and the durability of the bridge structure.

[0003] Currently, asphalt pavement layers on cement concrete bridge decks in my country are generally not individually designed. They typically follow the same paving scheme as the upper and middle layers of the road surface, primarily consisting of a traditional 4cm-thick SMA-13 ​​+ 6cm-thick SUP-20 / AC-20 pavement structure. A waterproof bonding layer is laid between the lower asphalt concrete layer and the cement concrete bridge deck to enhance the structural integrity and performance of the pavement. Survey results indicate that the damage rate of asphalt concrete pavements on cement concrete bridges is often much higher than that of adjacent roadbed sections. The most common defects are rutting, displacement, bulging, whitening, looseness, and potholes. Analysis of the causes revealed that for asphalt concrete pavements on cement concrete bridge decks, the significant modulus difference between the two materials makes the traditional waterproof bonding layer material incompatible with the concrete slabs on the bridge deck tunnel difficult to maintain, resulting in a weak interlayer with poor shear resistance. After being soaked and washed by seeping rainwater and repeatedly impacted by vehicles, the bonding layer easily separates from the bridge deck, causing the bridge deck pavement to lose its integrity. This, coupled with the material's inherent lack of heat resistance, directly leads to slippage, rutting, and whitening. Furthermore, because cast-in-place cement concrete slabs often lack flatness, the thickness of asphalt concrete paving is uneven during installation. The nominal maximum aggregate size of asphalt concrete used in the road mid-surface layer design is generally 19mm. This design results in an excessively small ratio between the layer thickness and the material's nominal maximum particle size, leading to significant segregation and the appearance of large voids within the pavement. This problem is a contributing factor to water damage to the road surface.

[0004] The wearing course of conventional asphalt pavement on cement concrete bridge decks utilizes asphalt mixtures with dense skeleton structures or dense suspended structures, such as SMA-13 ​​or AC-13. The pavement compaction porosity is generally between 4% and 7%. This type of structure, on the one hand, has large open voids within the mixture, allowing rainwater to easily penetrate, while the interconnected voids are small. Rainwater that does penetrate the mixture cannot be drained out of the pavement, making it prone to loosening and potholes under the action of dynamic water under vehicle driving conditions. On the other hand, the pavement's macroscopic structure is too small, resulting in severely insufficient anti-skid performance in rainy and snowy weather. Furthermore, hydroplaning severely affects the driver's vision, and driving noise is excessive.

[0005] Traditional asphalt pavement on cement concrete bridge decks consists of a 4cm top layer, a tack coat, a 6cm bottom layer, and a waterproof adhesive layer, with a total thickness of generally 10cm. The tack coat and waterproof adhesive layer are not included in the calculation. The top layer, as a functional layer, primarily provides waterproofing, anti-skid, anti-shear, anti-abrasion, and driving comfort. The bottom layer primarily provides anti-shear, load-bearing, waterproofing, and protection for the cement concrete pavement. As is well known, due to multiple factors such as the natural environment, traffic loads, and construction quality, the top layer's functionality, especially its anti-skid function, gradually diminishes with age. This necessitates milling and resurfacing of the 4cm-thick top layer, a repetitive process that wastes significant resources and increases operational and maintenance costs.

[0006] It can be seen that the current conventional bridge deck pavement does not take into account its special operating environment and stress conditions, which has buried the hidden danger of damage to the bridge deck pavement layer. Therefore, how to prevent the structural damage of bridge deck pavement and improve its service quality and durability has become a technical problem that needs to be solved urgently. Summary of the Invention

[0007] In order to solve the problems of traditional asphalt pavement layers of cement concrete bridge decks, such as poor flatness, rutting, displacement, bulging, looseness, potholes, whitening, poor anti-skid performance and durability, the present invention provides a long-life durable cement concrete bridge deck asphalt pavement layer and a construction method thereof. The asphalt pavement layer structure of the cement concrete bridge deck has overall stable stress, strong high and low temperature resistance, outstanding driving comfort and anti-skid performance, excellent interlayer bonding and crack resistance. At the same time, without increasing the project cost, the later maintenance and operation cost is low and the construction process is simple.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A long-life durable cement concrete bridge deck asphalt pavement layer comprises, from bottom to top, a solid-penetration bonding layer, an anti-cracking layer, an anti-fatigue waterproof layer, a load-bearing layer, a waterproof bonding layer, and a wear layer.

[0010] Preferably, the infiltration bonding layer material is a composite of slow-cracking modified emulsified asphalt and water-based epoxy, the evaporation residue content of the infiltration bonding layer material is not less than 40%, the penetration depth is not less than 10mm, the adhesion pull-off (40°C) of the infiltration bonding layer to the cement bridge deck is not less than 0.7Mpa, and the amount of the infiltration bonding layer material is 0.7-1.0kg / m 2 ;

[0011] Preferably, the anti-cracking layer is one of the roving basalt fiber or glass fiber, with a fiber length of 30mm-50mm, a fiber diameter of 8-20μm, a tensile strength of not less than 1500Mpa, and a fiber dosage of 80-150g / m 2 ;

[0012] Preferably, the anti-fatigue waterproof layer is a 20 mm thick high-viscosity and high-elasticity modified asphalt Strata stress absorption layer, wherein the porosity of the Strata stress absorption layer mixture is 0.5%-1.5%, the maximum failure strain of the mixture in the low-temperature bending test is not less than 3000 με, the fatigue life (15°C, 10HZ, 2000 με) is not less than 100,000 times, and the water permeability coefficient is not greater than 10 ml / min;

[0013] Preferably, the load-bearing layer is a high-modulus durable asphalt mixture EME-14 with a thickness of 60mm-75mm, wherein the maximum nominal particle size of the mineral material of the EME-14 mixture is 13.2mm, the porosity of the EME-14 asphalt mixture is 1%-2%, the dynamic stability in the rutting test is not less than 8000 times / mm, the maximum failure strain in the low-temperature bending test is not less than 2000με, the dynamic modulus (15℃, 10HZ) is not less than 14000Mpa, and the fatigue life (15℃, 10HZ, 130με) is not less than 1 million times;

[0014] Preferably, the waterproof bonding layer is a rubber asphalt stress absorption layer, wherein the spraying amount of the rubber asphalt is 1.5-1.8Kg / m 2 The amount of gravel spread is 6-9kg / m 2 , the softening point of rubber asphalt is not less than 65℃, and the dynamic viscosity of rubber asphalt at 60℃ is not less than 10000Pa.s;

[0015] Preferably, the wear layer is a 15-20 mm thick composite high modulus modified asphalt ultra-thin wear layer, wherein the maximum nominal particle size of the mineral material of the ultra-thin wear layer is 9.5 mm, the void ratio of the ultra-thin wear layer mixture is 12%-15%, the dynamic stability of the rutting test is not less than 6000 times / mm, the maximum failure strain of the low-temperature bending test is not less than 2000 με, the Marshall residual stability is not less than 85%, the freeze-thaw splitting strength ratio is not less than 80%, the structural depth is not less than 0.8 mm, the water permeability coefficient is not less than 1000 mL / min, and the road surface friction coefficient is not less than 60BPN.

[0016] The construction method of the long-life durable cement concrete bridge deck asphalt pavement layer comprises the following steps:

[0017] (1) The bridge deck cement concrete is subjected to fine milling or shot blasting treatment, and the surface dust is cleaned. The structural depth of the bridge deck after treatment is measured by the sand spreading method, and the structural depth is not less than 0.6 mm;

[0018] (2) Spray the permeation bonding layer at room temperature on the cleaned and dry cement concrete bridge deck. The amount of permeation bonding layer material is 0.7-1.0Kg / m 2 ;

[0019] (3) While spraying the infiltration and solid bonding layer, spray the anti-cracking layer fiber on the surface of the infiltration and solid bonding layer. The fiber dosage is 80-150g / m 2 ;

[0020] (4) After the construction of step (3) is completed, the curing is carried out for 30-120 minutes. The curing termination condition is that the surface is completely dry. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0021] (5) Pave the fatigue-resistant waterproof layer, high-viscosity and high-elasticity modified asphalt Strata stress absorption layer on the step (4), requiring the on-site compaction degree to be no less than 98%, and naturally cure until the surface temperature is below 50°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0022] (6) Pave the load-bearing layer on the step (5), with the high modulus durable asphalt mixture EME-14 having an on-site compaction degree of not less than 98%, and naturally cure until the surface temperature is below 50°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0023] (7) After spraying the waterproof bonding layer and the rubber asphalt stress absorption layer in step (6), the rubber asphalt stress absorption layer is rolled 2-3 times with a tire roller to make the pre-wrapped gravel more stable;

[0024] (8) A wearing layer is laid on the surface of step (7), wherein the on-site compaction degree of the ultra-thin wearing layer of composite high modulus modified asphalt is not less than 98%, the construction depth is not less than 0.8 mm, the friction coefficient is not less than 60 BPN, and the water permeability coefficient is not less than 1000 ml / min.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The infiltration bonding layer has high bonding strength, high permeability and convenient construction. It combines the strong bonding strength and acid and alkali resistance of thermosetting materials with the flexible crack resistance and penetration sealing ability of asphalt materials. It can penetrate into the capillary pores inside the cement concrete and has a good repair effect on the micro cracks in the bridge deck. It makes the upper structure layer and cement concrete bonded as a whole with common stress, and is not easily damaged by construction equipment and vehicle tires during construction.

[0027] (2) Basalt fiber and glass fiber with high tensile strength and durability provide strong crack resistance for the structural layer, which can effectively prevent reflective cracks from occurring in the asphalt pavement layer of the bridge deck and improve the overall stability of the structural layer;

[0028] (3) The Strata stress absorption layer is used as an anti-fatigue waterproof layer. The structural characteristics of the mixture are that it has more fine aggregate, less coarse aggregate, more mineral powder, and a high asphalt content. It has a dense structure, large deformation capacity, and high elasticity. It has the dual properties of waterproofing and anti-fatigue, which can effectively prevent fatigue cracking of the bridge deck asphalt layer.

[0029] (4) The load-bearing layer uses high modulus asphalt mixture EME-14, which has the characteristics and functions of anti-rutting, anti-fatigue, easy compaction, and water-tightness, which reduces the difficulty of construction control and effectively extends the service life of the bridge deck pavement;

[0030] (5) The rubber asphalt stress absorption layer acts as a waterproof layer, with outstanding waterproof, anti-cracking and viscosity-increasing effects. It can effectively prevent water in the wearing layer from seeping into the underlying asphalt mixture, preventing water damage and whitening of the structural layer. It also improves the bonding strength between the wearing layer and the underlying asphalt structure, preventing the structural layer from being subjected to stress alone.

[0031] (6) The composite high-modulus modified asphalt ultra-thin wearing course has a maximum nominal aggregate size of 9.5 mm, a thickness of 15-20 mm, and a void ratio of 12-15%. It features thinness, durability, anti-skid properties, crack resistance, water drainage, and low noise, significantly improving driving comfort and safety. The thinner thickness reduces the weight of the bridge, increasing its load-bearing capacity, and allows for faster and less expensive maintenance after surface degradation. Improving the average anti-skid performance of the pavement by approximately 40% reduces the traffic accident rate by nearly 20%.

[0032] (7) The present invention adopts an inverted structure with a thin lower layer, a coarse middle layer, and a fine upper layer, which effectively solves the problem of poor flatness of cast-in-place cement concrete slabs. If asphalt concrete with a larger nominal particle size is used in the construction of the lower layer, the construction will be controlled according to the average thickness, resulting in local paving thickness being too thin, and the unreasonable ratio of thickness to the maximum nominal particle size of the material, which will lead to mixture segregation, excessive gaps, and water seepage damage.

[0033] (8) The present invention has strong structural waterproofing. It uses a permeable bonding layer to pre-seal cracks in the cement concrete pavement layer, and then uses a fatigue waterproof layer and a rubber asphalt stress absorption layer as a double waterproof bonding layer to ensure that surface water does not enter the cement concrete pavement layer. By using an asphalt concrete load-bearing layer with a low porosity and a water permeability coefficient of less than 10%, a structural waterproof system is formed in a coordinated manner, effectively preventing the bridge deck and cement concrete pavement layer from being damaged by water;

[0034] (9) The cement concrete bridge deck asphalt pavement structure of the present invention has good durability, high and low temperature performance, waterproofness, adhesion and shear resistance, an overall thickness of 95-115 mm, adopts conventional construction technology and equipment, has simple construction control, and has low construction and maintenance costs. It can be used for new bridge deck pavement as well as for the maintenance of existing bridge decks. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the long-life, durable cement concrete asphalt pavement structure disclosed in the present invention. It includes: 1 - bridge deck cement concrete, 2 - solid-penetration bonding layer, 3 - anti-cracking layer, 4 - anti-fatigue waterproof layer, 5 - load-bearing layer, 6 - waterproof bonding layer, and 7 - wear layer. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention 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 only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1

[0038] A cement concrete bridge deck on the G35 Jiguang Expressway in Bozhou City, Anhui Province, is 205 meters long and 11.5 meters wide. The technical solution of the present invention is adopted, and the asphalt structure layer of the bridge deck is as follows:

[0039] A long-life durable cement concrete bridge deck asphalt pavement layer comprises, from bottom to top, a solid-penetration bonding layer, an anti-cracking layer, an anti-fatigue waterproof layer, a load-bearing layer, a waterproof bonding layer, and a wear layer.

[0040] Preferably, the infiltration bonding layer material is a composite of slow-cracking modified emulsified asphalt and water-based epoxy, the evaporation residue content of the infiltration bonding layer material is 40%, the penetration depth is 10mm, the adhesion pull-off (40°C) between the infiltration bonding layer and the cement bridge deck is 0.7Mpa, and the amount of the infiltration bonding layer material is 0.7kg / m 2 ;

[0041] As a preference, the anti-cracking layer is made of roving basalt fiber with a fiber length of 30 mm, a fiber diameter of 8 μm, a tensile strength of 1500 MPa, and a fiber dosage of 80 g / m 2 ;

[0042] Preferably, the anti-fatigue waterproof layer is a 20 mm thick high-viscosity and high-elasticity modified asphalt Strata stress absorption layer, wherein the porosity of the Strata stress absorption layer mixture is 0.5%, the maximum failure strain of the mixture in the low-temperature bending test is 3000 με, the fatigue life (15°C, 10 Hz, 2000 με) is 100,000 times, and the water permeability coefficient is 0;

[0043] Preferably, the load-bearing layer is a 60 mm thick high modulus durable asphalt mixture EME-14, wherein the maximum nominal particle size of the mineral material of the EME-14 mixture is 13.2 mm, the porosity of the EME-14 asphalt mixture is 1%, the dynamic stability of the rutting test is 8000 times / mm, the maximum failure strain of the low-temperature bending test is 2000 με, the dynamic modulus (15°C, 10 Hz) is 14000 MPa, and the fatigue life (15°C, 10 Hz, 130 με) is 1 million times;

[0044] Preferably, the waterproof bonding layer is a rubber asphalt stress absorption layer, wherein the spraying amount of the rubber asphalt is 1.5Kg / m 2 , the amount of gravel spread is 6kg / m 2 , the softening point of rubber asphalt is 65℃, and the dynamic viscosity of rubber asphalt at 60℃ is 10000Pa.s;

[0045] Preferably, the wear layer is a 15 mm thick composite high modulus modified asphalt ultra-thin wear layer, wherein the maximum nominal particle size of the mineral material of the ultra-thin wear layer is 9.5 mm, the porosity of the ultra-thin wear layer mixture is 12%, the dynamic stability of the rutting test is 6000 times / mm, the maximum failure strain of the low-temperature bending test is 2000 με, the Marshall residual stability is 85%, the freeze-thaw splitting strength ratio is 80%, the structural depth is 0.8 mm, the water permeability coefficient is 1000 mL / min, and the road surface friction coefficient is 60BPN.

[0046] The construction method of the long-life durable cement concrete bridge deck asphalt pavement layer comprises the following steps:

[0047] (1) The bridge deck cement concrete is milled or shot blasted, and the surface dust is cleaned. The structural depth of the bridge deck after treatment is measured by the sand spreading method, and the structural depth is 0.6;

[0048] (2) Spray the permeation bonding layer at room temperature on the cleaned and dry cement concrete bridge deck. The amount of permeation bonding layer material is 0.7 kg / m 2 ;

[0049] (3) While spraying the infiltration and solid bonding layer, spray the anti-cracking layer fiber on the surface of the infiltration and solid bonding layer. The fiber dosage is 80g / m 2 ;

[0050] (4) After the construction of step (3) is completed, the surface is allowed to dry completely for 30 minutes. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0051] (5) Pave the fatigue-resistant waterproof layer, high-viscosity and high-elasticity modified asphalt Strata stress absorption layer on the step (4), requiring the on-site compaction degree to be 98%, and naturally curing to a surface temperature of 45°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0052] (6) Paving the load-bearing layer on the step (5), the high modulus durable asphalt mixture EME-14 has an on-site compaction degree of 98%, and naturally curing to a surface temperature of 40°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0053] (7) After spraying the waterproof bonding layer and the rubber asphalt stress absorption layer in step (6), the rubber asphalt stress absorption layer is rolled twice with a tire roller to make the pre-wrapped gravel more stable;

[0054] (8) A wearing layer is laid on the surface of step (7). The on-site compaction degree of the composite high modulus modified asphalt ultra-thin wearing layer is 98%, the construction depth is 0.8 mm, the friction coefficient is 60 BPN, and the water permeability coefficient is 1000 ml / min.

[0055] Example 2

[0056] A municipal cement concrete bridge deck in Zhenjiang City, Jiangsu Province, is 58 meters long and 10.5 meters wide. The technical solution of the present invention is adopted, and the asphalt structure layer of the bridge deck is as follows:

[0057] A long-life durable cement concrete bridge deck asphalt pavement layer comprises, from bottom to top, a solid-penetration bonding layer, an anti-cracking layer, an anti-fatigue waterproof layer, a load-bearing layer, a waterproof bonding layer, and a wear layer.

[0058] Preferably, the infiltration bonding layer material is a composite of slow-cracking modified emulsified asphalt and water-based epoxy, the evaporation residue content of the infiltration bonding layer material is 42%, the penetration depth is 12mm, the adhesion pull-off (40°C) between the infiltration bonding layer and the cement bridge deck is 1.0Mpa, and the amount of the infiltration bonding layer material is 1.0kg / m 2 ;

[0059] Preferably, the anti-cracking layer is made of roving glass fiber with a fiber length of 50 mm, a fiber diameter of 20 μm, a tensile strength of 1600 MPa, and a fiber dosage of 150 g / m 2 ;

[0060] Preferably, the anti-fatigue waterproof layer is a 20 mm thick high-viscosity and high-elasticity modified asphalt Strata stress absorption layer, wherein the porosity of the Strata stress absorption layer mixture is 1.5%, the maximum failure strain of the mixture in the low-temperature bending test is 3200 με, the fatigue life (15°C, 10 Hz, 2000 με) is 102200 times, and the water permeability coefficient is 6 ml / min;

[0061] Preferably, the load-bearing layer is a 75 mm thick high modulus durable asphalt mixture EME-14, wherein the maximum nominal particle size of the mineral material of the EME-14 mixture is 13.2 mm, the porosity of the EME-14 asphalt mixture is 2%, the dynamic stability of the rutting test is 11,000 times / mm, the maximum failure strain of the low-temperature bending test is 2,100 με, the dynamic modulus (15°C, 10 Hz) is 15,090 MPa, and the fatigue life (15°C, 10 Hz, 130 με) is 1.08 million times;

[0062] Preferably, the waterproof bonding layer is a rubber asphalt stress absorption layer, wherein the spraying amount of the rubber asphalt is 1.8Kg / m 2 , the amount of gravel spread is 9kg / m 2 , the softening point of rubber asphalt is 70℃, and the dynamic viscosity of rubber asphalt at 60℃ is 15070Pa.s;

[0063] Preferably, the wear layer is a 20 mm thick composite high modulus modified asphalt ultra-thin wear layer, wherein the maximum nominal particle size of the mineral material of the ultra-thin wear layer is 9.5 mm, the porosity of the ultra-thin wear layer mixture is 15%, the dynamic stability of the rutting test is 9150 times / mm, the maximum failure strain of the low-temperature bending test is 2700 με, the Marshall residual stability is 91.7%, the freeze-thaw splitting strength ratio is 83.3%, the structural depth is 1.1 mm, the water permeability coefficient is 1206 mL / min, and the road surface friction coefficient is 65BPN.

[0064] The construction method of the long-life durable cement concrete bridge deck asphalt pavement layer comprises the following steps:

[0065] (1) The bridge deck cement concrete is milled or shot blasted, and the surface dust is cleaned. The structural depth of the bridge deck after treatment is measured by the sand spreading method, and the structural depth is 0.7 mm;

[0066] (2) Spray the permeation bonding layer at room temperature on the cleaned and dry cement concrete bridge deck. The amount of permeation bonding layer material is 1.0 kg / m 2 ;

[0067] (3) While spraying the infiltration and solid bonding layer, spray the anti-cracking layer fiber on the surface of the infiltration and solid bonding layer. The fiber dosage is 150g / m 2 ;

[0068] (4) After the construction of step (3) is completed, the surface is allowed to dry completely for 120 minutes. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0069] (5) Pave the fatigue-resistant waterproof layer, high-viscosity and high-elasticity modified asphalt Strata stress absorption layer on the step (4), requiring the on-site compaction degree to be 99.7%, and naturally curing to a surface temperature of 49.5°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0070] (6) Paving the load-bearing layer on the step (5), the high modulus durable asphalt mixture EME-14 has an on-site compaction degree of 98.6%, and naturally curing to a surface temperature of 40°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0071] (7) After spraying the waterproof bonding layer and the rubber asphalt stress absorption layer in step (6), the rubber asphalt stress absorption layer is rolled three times with a tire roller to make the pre-wrapped gravel more stable;

[0072] (8) A wearing layer was laid on the surface of step (7). The on-site compaction degree of the ultra-thin wearing layer of composite high modulus modified asphalt was 99.9%, the construction depth was 1.1 mm, the friction coefficient was 65 BPN, and the water permeability coefficient was 1206 ml / min.

[0073] Example 3

[0074] A cement concrete bridge deck on the Jurong section of National Highway G104 in Zhenjiang City, Jiangsu Province, with a length of 81 meters and a width of 11.5 meters, adopts the technical solution of the present invention. The asphalt structure layer of the bridge deck is as follows:

[0075] A long-life durable cement concrete bridge deck asphalt pavement layer comprises, from bottom to top, a solid-penetration bonding layer, an anti-cracking layer, an anti-fatigue waterproof layer, a load-bearing layer, a waterproof bonding layer, and a wear layer.

[0076] Preferably, the infiltration bonding layer material is a composite of slow-cracking modified emulsified asphalt and water-based epoxy, the evaporation residue content of the infiltration bonding layer material is 51%, the penetration depth is 10.5mm, the adhesion pull-off (40°C) between the infiltration bonding layer and the cement bridge deck is 0.8Mpa, and the amount of the infiltration bonding layer material is 0.8kg / m 2 ;

[0077] As an option, the anti-cracking layer is made of roving basalt fiber with a fiber length of 35 mm, a fiber diameter of 12 μm, a tensile strength of 1660 MPa, and a fiber dosage of 100 g / m 2 ;

[0078] Preferably, the anti-fatigue waterproof layer is a 20 mm thick high-viscosity and high-elasticity modified asphalt Strata stress absorption layer, wherein the porosity of the Strata stress absorption layer mixture is 1.0%, the maximum failure strain of the mixture in the low-temperature bending test is 3319 με, the fatigue life (15°C, 10 Hz, 2000 με) is 110808 times, and the water permeability coefficient is 0;

[0079] Preferably, the load-bearing layer is a 70 mm thick high modulus durable asphalt mixture EME-14, wherein the maximum nominal particle size of the mineral material of the EME-14 mixture is 13.2 mm, the porosity of the EME-14 asphalt mixture is 1.5%, the dynamic stability of the rutting test is 9800 times / mm, the maximum failure strain of the low-temperature bending test is 2370 με, the dynamic modulus (15°C, 10 Hz) is 16270 MPa, and the fatigue life (15°C, 10 Hz, 130 με) is 1.02 million times;

[0080] Preferably, the waterproof bonding layer is a rubber asphalt stress absorption layer, wherein the spraying amount of the rubber asphalt is 1.7Kg / m 2 , the amount of gravel spread is 8kg / m 2 , the softening point of rubber asphalt is 70℃, and the dynamic viscosity of rubber asphalt at 60℃ is 10290Pa.s;

[0081] Preferably, the wear layer is an 18 mm thick composite high modulus modified asphalt ultra-thin wear layer, wherein the maximum nominal particle size of the mineral material of the ultra-thin wear layer is 9.5 mm, the porosity of the ultra-thin wear layer mixture is 13%, the dynamic stability of the rutting test is 7270 times / mm, the maximum failure strain of the low-temperature bending test is 2150με, the Marshall residual stability is 89.7%, the freeze-thaw splitting strength ratio is 86.1%, the structural depth is 0.9 mm, the water permeability coefficient is 1390 mL / min, and the road surface friction coefficient is 69BPN.

[0082] The construction method of the long-life durable cement concrete bridge deck asphalt pavement layer comprises the following steps:

[0083] (1) The bridge deck cement concrete is subjected to fine milling or shot blasting treatment, and the surface dust is cleaned. The structural depth of the bridge deck after treatment is measured by the sand spreading method, and the structural depth is not less than 0.6 mm;

[0084] (2) Spray the permeation bonding layer at room temperature on the cleaned and dry cement concrete bridge deck. The amount of permeation bonding layer material is 0.8 kg / m 2 ;

[0085] (3) While spraying the infiltration and solid bonding layer, spray the anti-cracking layer fiber on the surface of the infiltration and solid bonding layer. The fiber dosage is 100g / m 2 ;

[0086] (4) After the construction of step (3) is completed, the curing is carried out for 90 minutes. The curing termination condition is that the surface is completely dry. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0087] (5) Pave the fatigue-resistant waterproof layer, high-viscosity and high-elasticity modified asphalt Strata stress absorption layer on the step (4), requiring the on-site compaction degree to be 100%, and naturally curing to a surface temperature of 35°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0088] (6) Paving the load-bearing layer on the step (5), the high modulus durable asphalt mixture EME-14 has an on-site compaction degree of 100%, and naturally curing to a surface temperature of 42°C. During the curing period, no construction vehicles or pedestrians are allowed to pass;

[0089] (7) After spraying the waterproof bonding layer and the rubber asphalt stress absorption layer in step (6), the rubber asphalt stress absorption layer is rolled three times with a tire roller to make the pre-wrapped gravel more stable;

[0090] (8) A wearing layer was laid on the surface of step (7). The on-site compaction degree of the ultra-thin wearing layer of composite high modulus modified asphalt was 99.3%, the construction depth was 0.9 mm, the friction coefficient was 69 BPN, and the water permeability coefficient was 1390 ml / min.

[0091] The above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other variations can be made based on the above description, and it is not necessary and impossible to enumerate all the embodiments here.

Claims

1. A long-life durable cement concrete bridge deck asphalt pavement layer, characterized in that: From bottom to top, it includes: solid bonding layer, anti-cracking layer, anti-fatigue waterproof layer, load-bearing layer, waterproof bonding layer, and wear layer. The infiltration and solid bonding layer material is a composite of slow-cracking modified emulsified asphalt and water-based epoxy. The evaporation residue content of the infiltration and solid bonding layer material is not less than 40%, the penetration depth is not less than 10 mm, the adhesion pull-off (40° C.) between the infiltration and solid bonding layer and the cement bridge deck is not less than 0.7 MPa, and the amount of the infiltration and solid bonding layer material is 0.7-1.0 kg / m 2 ; Preferably, the anti-cracking layer is one of the roving basalt fiber or glass fiber, with a fiber length of 30mm-50mm, a fiber diameter of 8-20μm, a tensile strength of not less than 1500Mpa, and a fiber dosage of 80-150g / m 2 ; Preferably, the anti-fatigue waterproof layer is a 20 mm thick high-viscosity and high-elasticity modified asphalt Strata stress absorption layer, wherein the porosity of the Strata stress absorption layer mixture is 0.5%-1.5%, the maximum failure strain of the mixture in the low-temperature bending test is not less than 3000 με, the fatigue life (15°C, 10HZ, 2000 με) is not less than 100,000 times, and the water permeability coefficient is not greater than 10 ml / min; Preferably, the load-bearing layer is a high-modulus durable asphalt mixture EME-14 with a thickness of 60mm-75mm, wherein the maximum nominal particle size of the mineral material of the EME-14 mixture is 13.2mm, the porosity of the EME-14 asphalt mixture is 1%-2%, the dynamic stability in the rutting test is not less than 8000 times / mm, the maximum failure strain in the low-temperature bending test is not less than 2000με, the dynamic modulus (15℃, 10HZ) is not less than 14000Mpa, and the fatigue life (15℃, 10HZ, 130με) is not less than 1 million times; Preferably, the waterproof bonding layer is a rubber asphalt stress absorption layer, wherein the spraying amount of the rubber asphalt is 1.5-1.8Kg / m 2 The amount of gravel spread is 6-9kg / m 2 , the softening point of rubber asphalt is not less than 65℃, and the dynamic viscosity of rubber asphalt at 60℃ is not less than 10000Pa.s; Preferably, the wear layer is a 15-20 mm thick composite high modulus modified asphalt ultra-thin wear layer, wherein the maximum nominal particle size of the mineral material of the ultra-thin wear layer is 9.5 mm, the void ratio of the ultra-thin wear layer mixture is 12%-15%, the dynamic stability of the rutting test is not less than 6000 times / mm, the maximum failure strain of the low-temperature bending test is not less than 2000 με, the Marshall residual stability is not less than 85%, the freeze-thaw splitting strength ratio is not less than 80%, the structural depth is not less than 0.8 mm, the water permeability coefficient is not less than 1000 mL / min, and the road surface friction coefficient is not less than 60BPN.

2. The construction method of a long-life durable cement concrete bridge deck asphalt pavement layer according to claim 1, characterized in that: The following steps are involved: (1) The bridge deck cement concrete is subjected to fine milling or shot blasting treatment, and the surface dust is cleaned. The structural depth of the bridge deck after treatment is measured by the sand spreading method, and the structural depth is not less than 0.6 mm; (2) Spray the permeation bonding layer at room temperature on the cleaned and dry cement concrete bridge deck. The amount of permeation bonding layer material is 0.7-1.0Kg / m 2 ; (3) While spraying the infiltration and solid bonding layer, spray the anti-cracking layer fiber on the surface of the infiltration and solid bonding layer. The fiber dosage is 80-150g / m 2 ; (4) After the construction of step (3) is completed, the curing is carried out for 30-120 minutes. The curing termination condition is that the surface is completely dry. During the curing period, no construction vehicles or pedestrians are allowed to pass; (5) Pave the fatigue-resistant waterproof layer, high-viscosity and high-elasticity modified asphalt Strata stress absorption layer on the step (4), requiring the on-site compaction degree to be no less than 98%, and naturally cure until the surface temperature is below 50°C. During the curing period, no construction vehicles or pedestrians are allowed to pass; (6) Pave the load-bearing layer on the step (5), with the high modulus durable asphalt mixture EME-14 having an on-site compaction degree of not less than 98%, and naturally cure until the surface temperature is below 50°C. During the curing period, no construction vehicles or pedestrians are allowed to pass; (7) After spraying the waterproof bonding layer and the rubber asphalt stress absorption layer in step (6), the rubber asphalt stress absorption layer is rolled 2-3 times with a tire roller to make the pre-wrapped gravel more stable; (8) A wearing layer is laid on the surface of step (7), wherein the on-site compaction degree of the ultra-thin wearing layer of composite high modulus modified asphalt is not less than 98%, the construction depth is not less than 0.8 mm, the friction coefficient is not less than 60 BPN, and the water permeability coefficient is not less than 1000 ml / min.

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