阅读说明：本技术 一种隧道复合式环氧沥青排水路面结构及工艺方法 (Tunnel composite epoxy asphalt drainage pavement structure and process method ) 是由 封基良 孙武云 张林艳 解斌 杨吉龙 于 2021-09-22 设计创作，主要内容包括：本发明属于隧道路面铺装技术领域,它涉及的是一种隧道复合式环氧沥青排水路面结构及工艺方法。结构层自上而下依次为环氧沥青排水混凝土上面层、密级配沥青混凝土应力吸收层、黏结层和基层；环氧沥青排水混凝土上面层为环氧沥青排水混合料EOGFC-13或EOGFC-16,采用后掺法工艺实施,密级配应力吸收层为富沥青用量的FAC-10,黏结层为环氧沥青黏结层或超高粘度改性沥青,基层为普通水泥混凝土PCC或连续配筋混凝土CRCP。能有效解决常用隧道路面耐久性不足、抗滑衰减快、热拌施工环境条件差、养护维修费用高,且安全隐患大等方面问题。可提供一种节能、降噪、环保、安全、舒适、可持续发展的隧道路面解决方案。(The invention belongs to the technical field of tunnel pavement, and relates to a tunnel composite epoxy asphalt drainage pavement structure and a process method. The structural layer sequentially comprises an epoxy asphalt drainage concrete upper surface layer, a dense graded asphalt concrete stress absorption layer, a bonding layer and a base layer from top to bottom; the upper layer of the epoxy asphalt drainage concrete is epoxy asphalt drainage mixture EOGFC-13 or EOGFC-16, the post-mixing process is adopted for implementation, the dense grading stress absorption layer is FAC-10 with rich asphalt dosage, the bonding layer is an epoxy asphalt bonding layer or ultrahigh viscosity modified asphalt, and the base layer is common cement concrete PCC or continuous reinforced concrete CRCP. The problems of insufficient durability, high skid resistance and attenuation, poor hot-mixing construction environmental condition, high maintenance and repair cost, high potential safety hazard and the like of the common tunnel pavement can be effectively solved. The tunnel pavement solution which is energy-saving, noise-reducing, environment-friendly, safe, comfortable and sustainable in development can be provided.)

1. A tunnel composite epoxy asphalt drainage pavement structure and a process method are characterized in that: the tunnel pavement structure comprises an epoxy asphalt drainage concrete surface layer (1), an oil-rich dense-graded asphalt concrete stress absorption (water sealing) layer (2), an epoxy asphalt bonding layer (3) and a base layer (4) which are sequentially arranged from top to bottom;

the upper surface layer of the epoxy asphalt drainage concrete is a high-strength, high-flexibility and fast-curing warm-mixed epoxy asphalt drainage mixture EOGFC-13 or EOGFC-16, post-mixing process construction is adopted, and the performance indexes are as follows: the stability is not less than 15KN, the immersion residual stability is not less than 85%, the freeze-thaw cleavage residual strength ratio (TSR) is not less than 80%, the rutting test dynamic stability is not less than 10000 times/mm, the low-temperature bending test destructive strain is not less than 2800 mu epsilon (winter cold zone)/2500 mu epsilon (winter cold zone and winter warm zone), the drainage coefficient (Marshall test piece) is not less than 0.2cm/s, the water permeability coefficient (rutting plate) is not less than 5000mL/min, and the curing strength of natural curing under the room temperature condition is not less than 8 kN;

the stress absorbing layer of the oil-rich dense-graded asphalt concrete is a framework compact type FAC-10 with the maximum nominal grain diameter of 9.5, the cementing material is a composite modified ultrahigh-viscosity modified asphalt material such as high polymer, tackifying resin, compatibilizer, high-softening-point natural asphalt and the like, the dynamic viscosity at 60 ℃ is more than 100 ten thousand Pa ∙ s, and the softening point is more than or equal to 95 ℃; the optimal oilstone ratio determined by the mixture oilstone comparison standard Marshall test method is 0.3-0.5%;

the bonding layer is an epoxy asphalt bonding layer or ultrahigh-viscosity modified asphalt, the mixing amount of an epoxy system of the epoxy asphalt bonding layer is higher than that of a binding material of epoxy asphalt drainage concrete, and the oil-rich dense-graded asphalt stress absorption layer cementing material of the ultrahigh-viscosity modified asphalt is the same as that of the ultrahigh-viscosity modified asphalt;

the base layer is ordinary cement concrete PCC or continuous reinforced concrete CRCP.

2. The tunnel composite epoxy asphalt drainage pavement structure and the process method according to claim 1, which are characterized in that: the epoxy asphalt drainage asphalt concrete is high-strength, high-flexibility and fast-curing warm-mixed epoxy asphalt EOGFC-13 or EOGFC-16, and the thickness of the epoxy asphalt drainage asphalt concrete is 20 mm-50 mm.

3. The tunnel composite epoxy asphalt drainage pavement structure and the process method according to claim 1, which are characterized in that: the stress absorbing layer of the oil-rich dense-graded asphalt mixture is composite ultrahigh-viscosity modified asphalt FAC-10, and the thickness of the stress absorbing layer is 10-20 mm.

4. The tunnel composite epoxy asphalt drainage pavement structure and the process method according to claim 1, which are characterized in that: the bonding layer is an epoxy asphalt bonding layer or ultrahigh viscosity modified asphalt, and the spreading amount is 4L/m²~0.6L/m²。

5. The tunnel composite epoxy asphalt drainage pavement structure and the process method according to claim 1, which are characterized in that: the base layer is made of ordinary cement concrete PCC or continuous reinforced concrete CRCP, the thickness of the base layer is 220 mm-320 mm, and the surface of the base layer needs to be processed by a fine milling or shot blasting grinding process.

6. The tunnel composite epoxy asphalt drainage pavement structure and the process method according to claim 1, which are characterized in that: the epoxy asphalt drainage concrete process comprises the following steps:

(1) mixing and stirring matrix asphalt, a curing agent, a curing accelerator, an auxiliary agent and other modifiers according to a certain proportion at 110-140 ℃ for 20-30 min to obtain an epoxy asphalt B component;

(2) heating the epoxy asphalt B component, the aggregate with the maximum nominal particle size of 13.2mm or 16mm, the filler and the admixture which are prepared according to the proportion to 120-150 ℃ in a mixing station, dry-mixing for 5-15 seconds, and wet-mixing for 22-35 seconds to produce a warm-mixed epoxy asphalt B component mixture;

(3) when the mixture of the component B is transported to a field for spreading, adopting special spreading equipment DT series equipment which is designed by the large-width and segregation-resistant post-mixing method of the middle and large mechanical group Limited liability company in Shaanxi, adding the component A of the epoxy asphalt in a mist-like spraying manner according to the mass ratio of A: B (700-1300), and uniformly mixing for the second time;

(4) and paving, rolling and curing the mixture which is uniformly mixed for the second time, and finishing the construction of the tunnel road surface structure of the post-mixing warm-mixed epoxy asphalt EOGFC-13 or EOGFC-16 tunnel with the void ratio of 20-25%.

7. The tunnel composite epoxy asphalt drainage pavement structure and the process method according to claim 1, which are characterized in that: the epoxy asphalt binder comprises the following components in percentage by weight:

(1) respectively heating the component A, namely epoxy resin E51 or E44, and the component B, namely matrix asphalt, a curing agent, a curing accelerator and other modification aids to the temperature of (87 +/-3) DEG C and the temperature of (150 +/-3);

(2) and (3) uniformly mixing according to the mass ratio of 100 (300-500) to obtain the epoxy asphalt interlayer binding material.

Technical Field

The invention belongs to the technical field of road pavement, and relates to a tunnel composite epoxy asphalt drainage pavement structure and a process method.

Background

At present, the main structure of the tunnel pavement in China is a composite pavement structure of a 4cm modified asphalt concrete +6cm modified asphalt concrete lower surface layer + 22-28 cm cement concrete rigid base layer. The paving material mainly takes a dense-graded asphalt mixture or SMA as a main material. The cementing material comprises thermoplastic rubber or plastic modified asphalt such as SBS modified asphalt, rubber asphalt and the like, and has poor adhesion with aggregate.

With the rapid development of economy in China, highway construction is also advanced from plain to mountain areas, the tunnel proportion is increased, the mileage of highway tunnels, particularly extra-long tunnels, is remarkably increased, and the mileage of China is rapidly increased by 1100km every year. However, the tunnel space is narrow and small, the driving sight is poor, the traffic detouring cost and the cost are high, under the heavy load effect, the tunnel pavement has the problems of too fast attenuation of the anti-skid functional index, short service life, poor durability and the like, and even if a flame retardant is added, the combustion essence of the tunnel pavement cannot be changed.

The OGFC is an open-graded and large-pore mixture, has excellent anti-skid, noise-reducing and water-discharging performances, and can improve the driving safety of tunnels and reduce noise. The longest service life of the epoxy asphalt reaches 49 years, the epoxy asphalt is a mature high-performance material, and the warm-mixed epoxy asphalt is used as a binding material, so that the problem of performance attenuation caused by small contact area of aggregate can be solved, and the service life and the durability of the epoxy asphalt are guaranteed. The post-doping process can overcome the problem that the epoxy asphalt is difficult to implement and apply due to short holding time and large influence of temperature, and provides a new solution for selection and determination of the tunnel pavement.

Disclosure of Invention

The invention provides a tunnel composite epoxy asphalt drainage pavement structure and a process method, aiming at solving the problems of quick anti-skid property attenuation, high noise, poor durability and the like of the existing tunnel pavement structure and providing a new solution for the tunnel pavement.

The invention provides a tunnel composite epoxy asphalt drainage pavement structure, which adopts the following technical scheme:

a tunnel composite epoxy asphalt drainage pavement structure comprises a drainage epoxy asphalt concrete surface layer (1), an oil-rich dense-graded asphalt concrete stress absorption layer (2), a bonding layer (3) and a base layer (4) which are sequentially arranged from top to bottom;

the epoxy asphalt drainage concrete is a warm-mixed epoxy asphalt drainage mixture EOGFC-13 or EOGFC-16, has the thickness of 20 mm-50 mm, and is implemented by adopting a post-mixing process. The performance indexes are as follows: marshall stability is not less than 15KN, immersion residual stability is not less than 85%, freeze-thaw cleavage residual strength ratio (TSR) is not less than 80%, rutting test dynamic stability is not less than 10000 times/mm, low-temperature bending test damage strain is not less than 2800 mu epsilon (cold zone)/2500 mu epsilon (cold zone and cold zone), drainage coefficient (Marshall test piece) is not less than 0.2cm/s, and water seepage coefficient (rutting plate) is not less than 5000 mL/min.

The stress absorption layer of the oil-rich dense-graded asphalt mixture is FAC-10, and the thickness of the stress absorption layer is 10 mm-30 mm. The cementing material is ultrahigh viscosity modified asphalt which is compositely modified by materials such as high polymer, tackifying resin, compatibilizer, natural asphalt and the like, and the dynamic viscosity at 60 ℃ is more than 100 ten thousand Pa ∙ s. The softening point is more than or equal to 95 ℃.

The bonding layer is epoxy asphalt bonding layer or ultrahigh viscosity modified asphalt, and the spreading amount is 0.4L/m²~0.6L/m²。

The preparation process of the epoxy asphalt bonding layer comprises the following components in percentage by weight: (1) the epoxy resin curing agent is prepared by uniformly mixing the component A, namely the epoxy resin, the component B, namely the matrix asphalt, the curing agent, the curing accelerator and other modification aids, respectively heating to 70 +/-10 ℃ and 150 +/-5 ℃, uniformly mixing according to the mass ratio of 100 (300-500) and carrying out quantitative spraying construction.

The bonding layer of the ultrahigh-viscosity modified asphalt is the ultrahigh-viscosity modified asphalt which is compositely modified by materials such as high polymer, tackifying resin, compatibilizer and natural asphalt, and the dynamic viscosity at 60 ℃ is more than 100 ten thousand Pa ∙ s. The softening point is more than or equal to 95 ℃.

The base layer is made of ordinary cement concrete PCC or continuous reinforced concrete CRCP, the thickness of the base layer is 220 mm-280 mm, and the surface of the base layer needs to be processed by a fine milling or shot blasting roughening process.

The epoxy asphalt drainage concrete is a warm-mixed epoxy asphalt drainage mixture EOGFC-13 or EOGFC-16, and the construction adopts a post-mixing process, and the concrete flow is as follows:

(1) mixing and stirring the matrix asphalt, the curing agent, the curing accelerator, the auxiliary agent and other modifiers according to a certain proportion at 110-140 ℃ for 20-30 min to prepare the epoxy asphalt B component.

(2) And heating the epoxy asphalt B component, the aggregate, the mineral powder and the admixture to 120-150 ℃ in a mixing station, and carrying out dry mixing for 5-15 seconds and wet mixing for 22-35 seconds to produce the epoxy asphalt B component mixture.

(3) When the mixture of the component B of the epoxy asphalt is transported to a construction site for paving, the component A of the epoxy asphalt is added in a mist spraying manner by adopting special paving equipment designed by a medium and large company and adopting a large-width and segregation-resistant DT series after-doping method according to the mass ratio of A to B of 100 (500-1000), and the mixture is evenly mixed for the second time,

(4) paving the epoxy asphalt drainage mixture which is mixed uniformly for the second time, rolling and curing, and finishing the construction of the tunnel road surface structure of the post-mixing warm-mixed epoxy asphalt EOGFC-13 or EOGFC-16.

The technical scheme has the advantages and characteristics that:

the structure has the functional characteristics of high driving comfort and high safety of the asphalt pavement and the structural characteristics of high durability and high bearing capacity of the cement concrete pavement. The epoxy asphalt drainage mixture is used as a road surface wearing layer, and due to the excellent performances of the epoxy asphalt, such as durability, corrosion resistance, fatigue resistance, ageing resistance and the like, the epoxy asphalt drainage pavement durability can be effectively improved, the anti-skid function attenuation and the material deformation are reduced, the driving comfort and safety are guaranteed, and the driving noise can be reduced. Meanwhile, the bonding material of the epoxy asphalt has excellent bonding and shearing resistance performance, so that the shearing slippage damage between layers can be effectively relieved. And the oil-rich dense-graded mixture FAC-10 is adopted between the epoxy asphalt drainage pavement surface layer and the cement concrete base layer as a stress absorption layer, so that the upward reflection of the reflection cracks of the cement concrete rigid base layer can be effectively inhibited, the downward permeation of moisture can be blocked, and the influence of the water action on the tunnel drainage pavement structure can be well reduced. Meanwhile, the construction process of the warm-mixed epoxy asphalt drainage pavement by adopting the 'after-mixing method' can improve the construction environment of the tunnel pavement, reduce the quality risks of links such as epoxy asphalt mixing, loading, transporting and paving waiting materials, effectively solve the risks of short curing reaction time of the epoxy asphalt mixture, difficult quality in the mixing and transporting process, limited application and popularization and the like, reduce the construction difficulty and reduce the application limit.

Drawings

FIG. 1 is a schematic cross-sectional view of a tunnel composite epoxy asphalt drainage pavement structure.

FIG. 1 depicts the following: a tunnel combined type epoxy asphalt drainage pavement structure is arranged from top to bottom in sequence: 1-a water-draining epoxy asphalt concrete upper surface layer; 2-oil-rich dense-graded asphalt concrete stress absorbing layer; 3-an epoxy asphalt adhesive layer; 4-substrate.

Detailed Description

The present application is described in further detail below with reference to FIG. 1.

The embodiment of the invention discloses a tunnel composite epoxy asphalt drainage pavement structure, the described embodiment is only a part of embodiment of the invention, but not all embodiments, and all other embodiments obtained by the related technical personnel in the field without creative labor achievement belong to the protection scope of the invention.

Referring to the legend, a tunnel combined type epoxy asphalt drainage pavement structure is arranged from top to bottom in sequence: 1-a water-draining epoxy asphalt concrete upper surface layer; 2-oil-rich dense-graded asphalt concrete stress absorbing layer; 3-an adhesive layer; 4-substrate.

The upper layer is prepared and produced by adopting warm-mixed epoxy asphalt, coarse aggregate, fine aggregate, filler, admixture and other materials according to a post-mixing method process of adding and mixing in two stages, and the structure with large pores, high strength, high modulus, fatigue resistance, rut resistance and excellent skid resistance after paving, rolling and maintenance is completed.

The stress absorbing layer of the lower layer oil-rich dense-graded asphalt concrete is ultrahigh viscosity modified asphalt compositely modified by high polymer, tackifying resin, compatibilizer, natural asphalt and other materials, the dosage of the ultrahigh viscosity modified asphalt is increased by 0.3-0.5 percent compared with the optimal oilstone ratio determined by normal Marshall test, the ultrahigh viscosity modified asphalt is mixed with coarse aggregate and fine aggregate, and after the filler is mixed by mixing equipment, the concrete is paved and rolled at the discharge temperature of 170-190 ℃, so that the stress absorbing layer can prevent the drainage infiltration of the upper layer epoxy asphalt concrete OGFC, and inhibit the crack reflection caused by the fracture of base joints, construction joints and plates.

The bonding layer is an important measure for enhancing the bonding force between the stress absorbing layer and the base layer, improving the interlaminar deformation and the anti-shearing capability and enabling the structure to form a whole. The bonding layer material adopts epoxy asphalt or ultrahigh viscosity modified asphalt, if the epoxy asphalt is adopted, the components of an epoxy condensate are higher than those of the epoxy asphalt cementing material on the upper layer, and the ultrahigh viscosity modified asphalt material is the same as the stress absorbing layer.

The base layer is a common cement concrete pavement CC or continuous reinforced concrete CRCP, and mainly plays a role in structural bearing.

Example 1: the thickness of the epoxy asphalt drainage concrete surface layer is 30mm, EOGFC-13 warm-mixed epoxy asphalt mixture is adopted, the maximum nominal particle size is 16mm, the void ratio is 21.2%, the Marshall stability is 27.6kN, the flow value is 2.6, the structure depth is 1.12mm, the water seepage coefficient is 5253mL/min, the friction coefficient is 73, the dynamic stability is 16242 times/mm, the water immersion residual stability is 9.17%, the freeze-thaw cleavage residual strength ratio is 90.4%, and the low-temperature bending damage strain is 2800 mu (%) epsilon.

The oil-rich dense-graded asphalt concrete stress absorption layer FAC-10 is 10mm thick, the dynamic stability of the oil-rich dense-graded asphalt concrete stress absorption layer FAC-10 is 3580 times/mm, the residual stability of the oil-rich dense-graded asphalt concrete stress absorption layer FAC-10 is 88.3 percent, the Marshall stability of the oil-rich dense-graded asphalt concrete stress absorption layer FAC-10 is 11.6kN, the asphalt dosage is 6.5 percent, the passing rate below 0.075mm is 7.5 percent, and the content of 4.75-9.5mm accounts for 62 percent.

The bonding layer is epoxy asphalt bonding layer or ultrahigh viscosity modified asphalt, and epoxy asphalt bonding material is sprayed on the surface of clean and dry cement concrete, wherein the spraying amount is 0.6L/m²The shear strength reaches 2.565MPa, and the drawing strength reaches 0.867 MPa.

The base layer is a common cement concrete (PCC) pavement, the thickness is 280mm, the modulus reaches the bending tensile strength standard value and is 5MPa, and the surface of the cement concrete base layer needs to be subjected to a fine milling and planing or shot blasting roughening process so as to improve the friction coefficient between layers, enhance the mechanical connection between the epoxy asphalt bonding layer and the surface layer as well as the base layer and improve the capability of the tunnel stress absorption layer for resisting interlaminar shear and push damage.

The structure base layer, the surface treatment, the bonding layer and the oil-rich dense-graded asphalt concrete stress absorption layer are implemented according to the existing technical Specification for road asphalt pavement construction (JTG F40).

Epoxy asphalt is a chemically modified material, has allowable time limit in construction, and is greatly influenced by temperature. Therefore, the construction difficulty is high, and the application is limited. In addition, when the epoxy asphalt is not cured, the bonding strength is low, and the hidden danger that traffic damage cannot be interrupted during curing is large. Therefore, the key is to solve the construction and rapid curing of the epoxy asphalt, the construction process method adopts a post-mixing epoxy asphalt mixture construction process (ZL 201610910189.7), the quality risks of the links of mixing, loading, transporting, paving, waiting and the like of the epoxy asphalt are reduced, the risks of short curing reaction time, difficult quality in the mixing and transporting process, application and popularization limitation and the like of the epoxy asphalt mixture can be effectively solved, the construction difficulty is reduced, and the application limitation is reduced.