CN113429160A - Bridge deck pavement waterproof bonding layer and construction method thereof - Google Patents

Bridge deck pavement waterproof bonding layer and construction method thereof Download PDF

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Publication number
CN113429160A
CN113429160A CN202110737601.0A CN202110737601A CN113429160A CN 113429160 A CN113429160 A CN 113429160A CN 202110737601 A CN202110737601 A CN 202110737601A CN 113429160 A CN113429160 A CN 113429160A
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China
Prior art keywords
bonding layer
waterproof bonding
bridge deck
waterproof
construction
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CN202110737601.0A
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CN113429160B (en
Inventor
李兆龙
何明静
路兆印
张星
王玉杰
聂健行
范文超
褚志文
陈乃栋
邢兰涛
潘辉
郭超
卢成永
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First Engineering Co Ltd of China Railway 23rd Bureau Group Co Ltd
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First Engineering Co Ltd of China Railway 23rd Bureau Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/26—Bituminous materials, e.g. tar, pitch
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
    • E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention relates to a bridge deck pavement waterproof bonding layer and a construction method thereof, wherein the waterproof bonding layer mainly comprises 6-8 parts of SBS modified asphalt; 23-27 parts of coarse aggregate; 70-74 parts of fine aggregate; 0.7 to 1.3 portions of quicklime powder; 1.7 to 2.3 portions of mineral powder; wherein the coarse aggregate and the fine aggregate are basalt broken stones with different grain size grades. According to the invention, through the selection of raw material components and the targeted adjustment of the mixing ratio, the waterproof bonding layer has good waterproof capability, anti-rutting capability and durability. According to the invention, the waterproof bonding layer is firstly paved and then rolled on the premise of mixture preparation in the construction process, so that the uniformity of the materials and the thickness of the mixture construction can be ensured, the paving process cannot be damaged, the construction efficiency and the construction quality can be effectively ensured, and meanwhile, the waterproof bonding layer has good waterproof stability.

Description

Bridge deck pavement waterproof bonding layer and construction method thereof
Technical Field
The invention relates to the technical field of pavement construction, in particular to a bridge deck pavement waterproof bonding layer and a construction method thereof.
Background
The bridge deck pavement is an important component of a bridge deck system and is generally divided into several layers from bottom to top, namely a reinforced concrete bridge deck, a concrete leveling layer, a waterproof bonding layer, a reinforcing mesh and cement concrete. The waterproof bonding layer plays an important role in bridge deck pavement, and the waterproof layer plays a role in waterproof and drainage and can also play a role in bonding and the like.
At present, SBS modified asphalt and premixed macadam seal layers are generally adopted for bridge deck pavement waterproof bonding layers, but the modified asphalt macadam seal layers are not ideal in waterproof effect and durability, water is easy to permeate, the waterproof effect is poor, and the seal layers are easy to fall off due to rolling of vehicles during surface layer construction, particularly in rainy and humid areas.
Therefore, the development of the novel bridge deck pavement waterproof bonding layer has important significance for effectively improving the waterproof capacity, driving comfort and road surface service life of bridge deck pavement of lake and river-crossing grand bridges or more than humid areas.
Disclosure of Invention
The invention aims to: aiming at the problems of poor waterproof effect, poor durability, easy falling off after rolling and the like of the bridge deck pavement waterproof bonding layer in the prior art, the invention provides the bridge deck pavement waterproof bonding layer and the construction method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a waterproof bonding layer for bridge deck pavement mainly comprises the following raw materials,
6-8 parts of SBS modified asphalt;
23-27 parts of coarse aggregate;
70-74 parts of fine aggregate;
0.7 to 1.3 portions of quicklime powder;
1.7 to 2.3 portions of mineral powder;
wherein the coarse aggregate and the fine aggregate are basalt broken stones with different grain size grades.
In the raw materials of the waterproof bonding layer provided by the invention, SBS modified asphalt is adopted as the asphalt, and basalt macadam with different grain size grades is used as coarse and fine aggregate; the raw material materials are added with the quicklime powder and the mineral powder, and the aggregates and the fillers achieve perfect matching effect through selection of the raw material components and targeted adjustment of the mixing proportion, so that the wrapping force of the asphalt on the aggregates is increased, and the waterproof bonding layer has good waterproof capability, anti-rutting capability and durability.
Further, the SBS modified asphalt is styrene-butadiene-styrene (SBS) rubber modified asphalt.
Further, the bridge deck pavement waterproof bonding layer mainly comprises 6-7.5 parts of SBS modified asphalt; 23-27 parts of coarse aggregate; 70-74 parts of fine aggregate; 1.0 to 1.3 portions of quicklime powder; 1.7 to 2.3 portions of mineral powder.
Further, the bridge deck pavement waterproof bonding layer mainly comprises 6.8 to 7.5 parts of SBS modified asphalt; 25-27 parts of coarse aggregate; 72-74 parts of fine aggregate; 1.0 to 1.3 portions of quicklime powder; 1.7 to 2.3 portions of mineral powder.
Further, the coarse aggregate is basalt macadam with the grain size of 3-6 mm; the fine aggregate is basalt broken stone with the grain diameter of 0-3 mm. Further, the fine aggregate is basalt broken stone with the grain size of 0.1-3 mm.
Furthermore, the softening point of the SBS modified asphalt is not less than 60 ℃, and the penetration (25 ℃,100g, 5s) is 40-60 (0.1 mm).
Further, the quicklime powder has the appearance of no aggregate and no caking, and the water content is not more than 1%.
Furthermore, in the raw materials of the bridge deck pavement waterproof bonding layer, the oilstone ratio is 6.8-7.2%. For example, the oilstone ratio is 6.8%, 6.9%, 7.0%, 7.1%, or 7.2%. Through a large number of experimental researches of the inventor, the oilstone ratio in the raw material of the waterproof bonding layer is an important influence factor influencing the effect, and if the oilstone ratio is too high, the waterproof bonding layer is easy to be oiled, and has poor anti-rutting capability and poor high-temperature stability; if the oilstone ratio is too low, the waterproof bonding layer is easy to have poor asphalt saturation, large porosity and poor water seepage effect. Preferably, in the raw materials of the bridge deck pavement waterproof bonding layer, the oilstone ratio is 7.0-7.2%.
Further, the oil-stone ratio is the weight ratio of the SBS modified asphalt to other raw materials, and the other raw materials are basalt macadam, quicklime powder and mineral powder.
Furthermore, in the raw materials of the bridge deck pavement waterproof bonding layer, the weight of the quicklime powder accounts for 1.0-1.4% of the total amount of the basalt macadam, the quicklime powder and the mineral powder. For example, the quicklime powder may account for 1.0%, 1.05%, 1.2%, 1.25%, 1.3%, 1.35%, or 1.4% by weight of the combined amount of the basalt broken stone, quicklime powder, and mineral powder. A large amount of experimental researches of the inventor show that the addition amount of the quicklime powder has a close relation with the performance of the waterproof bonding layer, the addition of the quicklime can increase the wrapping performance of basalt stones and asphalt, the quicklime powder is added into the asphalt and the basalt stones through the matching of the quicklime and the mineral powder, the strength, the density and the water stability of the waterproof bonding layer can be effectively guaranteed, the pH value of a mixed material can be influenced by too little or too much quicklime powder, the wrapping force of the asphalt is reduced, and therefore the comprehensive performance of the waterproof bonding layer is greatly reduced. Preferably, in the raw materials of the bridge deck paving waterproof bonding layer, the weight of the quicklime powder accounts for 1.2-1.34% of the total amount of the basalt macadam, the quicklime powder and the mineral powder. More preferably, in the raw materials of the bridge deck pavement waterproof bonding layer, the weight of the quicklime powder accounts for 1.2-1.3% of the total amount of the basalt macadam, the quicklime powder and the mineral powder.
The invention also aims to provide a construction method of the waterproof bonding layer.
A construction method of a bridge deck pavement waterproof bonding layer comprises the following steps:
step 1, cleaning a bridge deck to be paved and carrying out leveling treatment;
mixing the raw materials of the waterproof bonding layer according to the mixing proportion to obtain a mixture;
step 2, spreading the mixture to be layered;
and 3, rolling the layer paved in the step 2 to finish the construction of the waterproof bonding layer.
At present, the waterproof bonding layer of the SBS modified hot asphalt and the pre-mixed broken stone sealing layer is formed by spreading the SBS modified hot asphalt and the pre-mixed broken stone, the spreading is uneven and the thickness is inconsistent, part of spread cloth is easy to damage when a surface layer is spread, a road roller is used for carrying out static pressure after the spreading construction by adopting a spreading vehicle, the compactness of the waterproof bonding layer cannot be guaranteed, the waterproof effect is poor, and the construction quality is difficult to control.
According to the construction of the waterproof bonding layer, the water stability, the strength and the workability of the mixture are ensured by controlling the selection of the raw material components and the adjustment of the mixing ratio, the material and the thickness uniformity of the mixture construction can be ensured by firstly paving and then rolling on the premise of preparing the mixture, the paving process cannot be damaged, the construction efficiency and the construction quality can be effectively ensured, and meanwhile, the waterproof bonding layer has good waterproof stability.
Further, in the step 1, the mixing time is 20 to 60 seconds. The mixing time of the mixture directly influences the uniformity and quality of the mixture, and uneven mixing can cause the phenomena of asphalt sand agglomeration, material blooming and segregation. Preferably, in the step 1, the mixing time is 40 to 60 seconds.
Further, in the step 1, the temperature of the raw materials of the waterproof bonding layer is controlled to be 170-195 ℃ in the mixing process. Through a large amount of experimental researches of the inventor, the control of the mixing temperature plays a role in determining the quality of the mixture, the aging and the loss of the viscosity of the asphalt can be caused by overhigh temperature, the asphalt mixture is easy to peel off and loose, the service life is influenced, the porosity of the mixture is overhigh and the Marshall stability is low, the subsequent construction temperature is not easy to control, and the construction is influenced. Preferably, in the step 1, the temperature of the waterproof bonding layer raw material is controlled to be 170-185 ℃ during the mixing process.
Further, in the step 2, the mixture is spread to be paved by a full-width spreading machine.
Furthermore, the spreading speed is 3m/min to 5 m/min. In the paving construction, the high-power full-width paver is adopted, so that the paving speed is increased, and the initial density and the flatness of a paving layer are ensured.
Further, in the step 2, the mixture is spread to be paved by a high-power full-width spreader.
Further, in the step 2, before paving, the screed of the paver is heated in advance for 1-1.5h until the temperature of the screed is 110-120 ℃. The proper temperature setting can avoid the galling phenomenon when starting and paving.
Further, in the step 2, the traveling speed of the paver is ensured to be uniform and continuous, and the material distributing screw is ensured to ensure that the height of the mixture on the two sides is not less than the height of the material distributor of 2/3.
Furthermore, in the step 2, the paving temperature should be not lower than 160 ℃, and the paved mixture should be checked in time during the paving process, if white exposure, yellowing and oil pocket appear, should be processed in time.
Further, in the step 3, the rolling process is divided into three stages of primary rolling, secondary rolling and final rolling, wherein the primary rolling and the secondary rolling are performed for 2-3 times by adopting an oscillating roller, and the final rolling is performed for 2-3 times by adopting the static pressure of a rubber wheel rolling roller. Because the temperature loss of the ultrathin asphalt layer is fast and the bridge deck asphalt layer is easy to resonate with a bridge in the rolling process, the oscillation roller is adopted in the ultrathin asphalt sand rolling construction, the resonance phenomenon generated by the oscillation of the oscillation roller in the construction is obviously lower than that of the oscillation roller, and the oscillation roller can transmit compaction energy to a required area without transmitting the compaction energy to the surrounding environment to cause unnecessary vibration. The defects that the vibratory roller is easy to generate waves, resonate and has low speed are overcome, the rolling operation is guaranteed to be completed within the specified time, the construction efficiency is improved, and the finished product quality of the ultrathin asphalt layer is guaranteed.
Further, in step 3, the vibratory roller is a double steel wheel vibratory roller.
Further, in the step 3, the initial pressure temperature is not lower than 160 ℃, the re-pressure temperature is not lower than 140 ℃, and the final pressure temperature is not lower than 110 ℃. Researches show that the asphalt is accelerated to age due to overhigh temperature, the direct influence is that the asphalt ductility is reduced, the flexibility of the asphalt mixture is reduced, the service life of the pavement is easily reduced, and the defects such as cracking and the like occur; if the bonding measures of all the surface layers are not good, the displacement of the aggregate at high temperature can also be carried out along the traveling direction, and the aggregate directly shows transition damage. Too low results in non-compaction of the roller and failure to achieve the desired compaction.
Further, in step 3, the process of preliminary pressure is for adopting 2 two steel oscillation type road rollers to vibrate in high frequency low-amplitude mode and roll 2 times, and the width of overlapping of road roller footprint is about 20 ~ 30cm, and every road roller takes the full width to roll and all rolls to the eminence from the low department of cross slope, rolls length and vertically is the notch cuttype and arranges, and the compaction speed is 6 ~ 8 km/h.
Further, in the step 3, the re-pressing process is performed by adopting 3 double-steel oscillating rollers, the rolling mode of the roller is the same as that of the initial pressing, the rolling is performed for 2 times in total, and the compacting speed is 5-7 km/h.
Further, in the step 3, the final pressing process is to adopt 1 rubber wheel to press the road roller to perform static pressure polishing for 2 times until no obvious wheel track exists.
Further, in the step 3, after the waterproof bonding layer is completed, the thickness of the waterproof bonding layer is 1.8 cm-2.2 cm.
Further, in the steps 1 to 3, construction joint treatment is performed as necessary. Further, the construction joint treatment specifically comprises that transverse joints are not left on the bridge deck as far as possible, if necessary, the joints are flat joints, the transverse joints are left at the positions of the bridge expansion joints as far as possible, if the transverse joints cannot be left at the positions of the expansion joints, the joints are detected by using a 3m ruler during the same day, all the uneven parts are cut flat and chiseled, and modified emulsified asphalt is coated on the cut surfaces. And when the paving is continued, the screed of the paver starts to pave from the seam.
The invention adopts the mechanical combination of a high-power full-width paver and a double-steel-wheel vibratory roller in the construction of the ultrathin asphalt waterproof layer, ensures the construction speed and the paving quality through the high-power output and the full-width paving of the paver, solves the paving problem of the ultrathin asphalt layer through the accurate control of the elevation angle, the speed and the like of the paver, overcomes the defects of easy generation of waves, resonance and low speed of the vibratory roller through the vibratory rolling of the vibratory roller, quickly completes the construction under the condition of large temperature loss through the adjustment of the rolling times, the speed and the roller combination of the construction machinery, and ensures the flatness and the compaction degree of the asphalt layer.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the raw materials of the waterproof bonding layer provided by the invention, SBS modified asphalt is adopted as the asphalt, and basalt macadam with different grain size grades is used as coarse and fine aggregate; the quicklime powder and the mineral powder are added into the raw material, and the waterproof bonding layer has good waterproof capability, anti-rutting capability and durability through selection of raw material components and targeted adjustment of the mixing ratio.
2. According to the construction of the waterproof bonding layer, the water stability, the strength and the workability of the mixture are ensured by controlling the selection of the raw material components and the adjustment of the mixing ratio, the material and the thickness uniformity of the mixture construction can be ensured by firstly paving and then rolling on the premise of preparing the mixture, the paving process cannot be damaged, the construction efficiency and the construction quality can be effectively ensured, and meanwhile, the waterproof bonding layer has good waterproof stability.
3. The invention adopts the mechanical combination of the high-power full-width paver and the double-steel-wheel vibratory roller in the construction of the ultrathin asphalt waterproof layer, and the high-power full-width paver is adopted, so that the paving speed is accelerated, and the initial density and the flatness of a paved layer are ensured; because the temperature loss of the ultrathin asphalt layer is fast and the bridge deck asphalt layer is easy to resonate with a bridge in the rolling process, the oscillation roller is adopted in the ultrathin asphalt sand rolling construction, the resonance phenomenon generated by the oscillation of the oscillation roller in the construction is obviously lower than that of the oscillation roller, and the oscillation roller can transmit compaction energy to a required area without transmitting the compaction energy to the surrounding environment to cause unnecessary vibration. The defects that the vibratory roller is easy to generate waves, resonate and has low speed are overcome, the rolling operation is guaranteed to be completed within the specified time, the construction efficiency is improved, and the finished product quality of the ultrathin asphalt layer is guaranteed.
4. The ultrathin asphalt waterproof bonding layer provided by the invention has the water seepage rate lower than 10ml/min, the average dynamic stability DS (dynamic stability) can reach more than 3700 times/mm in an anti-rutting experiment, the freeze-thaw splitting strength ratio can reach more than 95%, and the ultrathin asphalt waterproof bonding layer has excellent waterproofness, anti-rutting property and durability.
Detailed Description
The present invention will be described in detail below.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, SBS modified asphalt was purchased from Qingdao Nissan Ginton asphalt Co.
Figure BDA0003140444830000061
Quicklime powder was purchased from wulong shun calcium industry ltd.
Figure BDA0003140444830000062
The ore fines were purchased from southwestern china cement limited.
Basalt macadam is purchased from environmental protection technologies ltd, rungjie, qingzhou.
Example 1
A certain bridge section is a super bridge crossing rivers and lakes, is positioned in a certain lake drainage basin, and has large rainfall and large water mist all the year round. In order to improve the waterproof capability, driving comfort and road service life of a bridge deck structure, a novel bridge deck pavement waterproof bonding layer and a construction method thereof are provided.
The waterproof bonding layer mainly comprises the following raw materials,
7 parts of SBS modified asphalt; 25 parts of basalt broken stone with the grain size gradation of 3-6 mm; 72 parts of basalt broken stone with the grain size gradation of 0-3 mm; 1.3 parts of quicklime powder; 1.7 parts of mineral powder.
The waterproof bonding layer is constructed by the following method.
The lower bearing layer is inspected before construction, pollutants, garbage and the like are timely cleaned, filling and pollution prevention of the position of the expansion joint are well achieved, maintenance of mechanical equipment is strengthened, trial operation is carried out before work, and the problem that the mechanical equipment is not big in construction is guaranteed.
Step 1, cleaning a bridge deck to be paved and carrying out leveling treatment; mixing the raw materials of the waterproof bonding layer according to a mixing ratio, wherein the mixing time is 55s, and the mixing temperature is controlled to be 175 ℃;
preferably, if the mixture needs to be transported after being mixed in the step 1, attention needs to be paid to that the asphalt mixture transport vehicle is specially used for the special vehicle, and the isolating agent is coated on the bottom plate and the side plate to prevent residual asphalt mixture from being sticky. Before loading, the transport vehicle is required to be covered with cotton on iron sheets of two side plates for heat preservation, and a temperature inspection round hole with the diameter of 1cm is reserved at a position 30-40cm above a bottom plate in the middle of the carriage for detecting the field temperature. The parking spaces are moved for not less than 3 times in the loading process, and the loading sequence is ensured to be three times of loading from the front part to the rear part to the middle part of the carriage. Tarpaulin must be covered in the transit of mixture, temperature loss and environmental pollution in the reduction transportation process, and the transport vechicle should carry out the temperature inspection and take notes by the car after arriving the scene. The transportation vehicle is arranged with a specially-assigned person to clean the vehicle, so as to ensure the cleanness of the tire and not pollute the paving site.
And 2, paving the mixture on the layer to be paved by adopting a high-power full-width paver, and paving the upper layer of the asphalt concrete by adopting a high-power full-width paver to ensure the flatness and the construction efficiency of the paved layer, so that the full-braking functions of speed, material conveying, material level, frequency, amplitude, stopping and descending prevention, starting and ascending prevention and the like are ensured in the construction process, and the paving speed is 4 m/min. The screed plate of the paver is heated 1h in advance before the asphalt sand is paved, so that the temperature of the screed plate is 110-120 ℃, and the galling phenomenon during starting paving is avoided. The advancing speed of the paver is ensured to be uniform and continuous, the material distributing screw is ensured to ensure that the height of the mixture on two sides is not less than the height of a material distributor of 2/3, and the driving speed of the paver is preferably controlled to be 3-5 m. The paving temperature is not lower than 160 ℃, and the paved mixture is checked in time in the paving process, such as white and yellow appearance and oil pocket treatment in time.
Step 3, carrying out rolling treatment on the bedding surface paved in the step 2, wherein the rolling process is divided into three stages of primary pressing, secondary pressing and final pressing; and finishing the construction of the waterproof bonding layer.
Wherein the initial pressure: the method comprises the following steps of rolling by adopting 2 13T double-steel-wheel oscillation type road rollers, rolling for 2 times by vibration, wherein the overlapping width of wheel tracks of the road rollers is about 20-30 cm, each road roller is rolled in a full width mode and is rolled from a low position of a cross slope to a high position, the rolling length is longitudinally arranged in a step mode, and the compaction speed is 6-8 km/h.
Repressing: and (3) rolling by adopting a 13T Dynapex double-steel oscillation type road roller, wherein the rolling mode of the machine is the same as the primary rolling mode, the rolling is carried out for 2 times in total, and the compaction speed is 5-7 km/h.
Final pressure: three rubber-wheeled road rollers are adopted for static pressing on two sides, and no wheel tracks on the road surface are guaranteed after static pressing.
Construction joint treatment
If the bridge deck is finished in the same day, the joints are detected by a 3m ruler, the uneven parts are all cut flat and chiseled off, and modified emulsified asphalt is coated on the tangent plane. And when the paving is continued, the screed of the paver starts to pave from the seam.
The bridge floor waterproof bonding layer is a square meter with the thickness of 15 ten thousand, all the construction methods of the ultrathin asphalt sand waterproof bonding layer are adopted in the construction, and the construction cost of asphalt sand waterproof layer project is 473 ten thousand yuan. Compared with the SBS modified hot asphalt ready-mixed gravel seal construction method, the waterproof bonding layer constructed by the method has better water stability, compactness, flatness, durability and the like, has higher construction speed, construction quality and economic benefit, shortens the construction period of the asphalt sand waterproof layer by 1 month and saves the engineering cost by about 50 ten thousand yuan.
Example 2
Raw material of waterproof bonding layer
6.8 parts of SBS modified asphalt; 23 parts of basalt broken stone with the grain size gradation of 3-6 mm; 74 parts of basalt broken stone with the grain size gradation of 0-3 mm; 1.0 part of quicklime powder; 2.0 parts of mineral powder.
Construction method
Step 1, cleaning a bridge deck to be paved and carrying out leveling treatment; mixing the raw materials of the waterproof bonding layer according to the mixing proportion, wherein the mixing time is 30s, and the mixing temperature is controlled to be 170 ℃;
and 2, paving the mixture on the layer to be paved by adopting a high-power full-width paver, and paving the upper layer of the asphalt concrete by adopting a high-power full-width paver to ensure the flatness and the construction efficiency of the paved layer, so that the full-braking functions of speed, material conveying, material level, frequency, amplitude, stopping and descending prevention, starting and ascending prevention and the like are ensured in the construction process, and the paving speed is 4 m/min. The screed plate of the paver is heated 1h in advance before the asphalt sand is paved, so that the temperature of the screed plate is 110-120 ℃, and the galling phenomenon during starting paving is avoided. The advancing speed of the paver is ensured to be uniform and continuous, the material distributing screw is ensured to ensure that the height of the mixture on two sides is not less than the height of a material distributor of 2/3, and the driving speed of the paver is preferably controlled to be 3-5 m. The paving temperature is not lower than 160 ℃, and the paved mixture is checked in time in the paving process, such as white and yellow appearance and oil pocket treatment in time.
Step 3, carrying out rolling treatment on the bedding surface paved in the step 2, wherein the rolling process is divided into three stages of primary pressing, secondary pressing and final pressing; and finishing the construction of the waterproof bonding layer.
Wherein the initial pressure: the method comprises the following steps of rolling by adopting 2 13T double-steel-wheel oscillation type road rollers, rolling for 2 times by vibration, wherein the overlapping width of wheel tracks of the road rollers is about 20-30 cm, each road roller is rolled in a full width mode and is rolled from a low position of a cross slope to a high position, the rolling length is longitudinally arranged in a step mode, and the compaction speed is 6-8 km/h.
Repressing: and (3) rolling by adopting a 13T Dynapex double-steel oscillation type road roller, wherein the rolling mode of the machine is the same as the primary rolling mode, the rolling is carried out for 2 times in total, and the compaction speed is 5-7 km/h.
Final pressure: three rubber-wheeled road rollers are adopted for static pressing on two sides, and no wheel tracks on the road surface are guaranteed after static pressing.
Example 3
Raw material of waterproof bonding layer
7.2 parts of SBS modified asphalt; 27 parts of basalt macadam with the grain size gradation of 3-6 mm; 70 parts of basalt macadam with the grain size gradation of 0-3 mm; 1.2 parts of quicklime powder; 2.3 parts of mineral powder.
Construction method
Step 1, cleaning a bridge deck to be paved and carrying out leveling treatment; mixing the raw materials of the waterproof bonding layer according to a mixing ratio, wherein the mixing time is 50s, and the mixing temperature is controlled to be 180 ℃;
and 2, paving the mixture on the layer to be paved by adopting a high-power full-width paver, and paving the upper layer of the asphalt concrete by adopting a high-power full-width paver to ensure the flatness and the construction efficiency of the paved layer, so that the full-braking functions of speed, material conveying, material level, frequency, amplitude, stopping and descending prevention, starting and ascending prevention and the like are ensured in the construction process, and the paving speed is 4 m/min. The screed plate of the paver is heated 1h in advance before the asphalt sand is paved, so that the temperature of the screed plate is 110-120 ℃, and the galling phenomenon during starting paving is avoided. The advancing speed of the paver is ensured to be uniform and continuous, the material distributing screw is ensured to ensure that the height of the mixture on two sides is not less than the height of a material distributor of 2/3, and the driving speed of the paver is preferably controlled to be 3-5 m. The paving temperature is not lower than 160 ℃, and the paved mixture is checked in time in the paving process, such as white and yellow appearance and oil pocket treatment in time.
Step 3, carrying out rolling treatment on the bedding surface paved in the step 2, wherein the rolling process is divided into three stages of primary pressing, secondary pressing and final pressing; and finishing the construction of the waterproof bonding layer.
Wherein the initial pressure: the method comprises the following steps of rolling by adopting 2 13T double-steel-wheel oscillation type road rollers, rolling for 2 times by vibration, wherein the overlapping width of wheel tracks of the road rollers is about 20-30 cm, each road roller is rolled in a full width mode and is rolled from a low position of a cross slope to a high position, the rolling length is longitudinally arranged in a step mode, and the compaction speed is 6-8 km/h.
Repressing: and (3) rolling by adopting a 13T Dynapex double-steel oscillation type road roller, wherein the rolling mode of the machine is the same as the primary rolling mode, the rolling is carried out for 2 times in total, and the compaction speed is 5-7 km/h.
Final pressure: three rubber-wheeled road rollers are adopted for static pressing on two sides, and no wheel tracks on the road surface are guaranteed after static pressing.
Example 4
Raw material of waterproof bonding layer
7.5 parts of SBS modified asphalt; 27 parts of basalt macadam with the grain size gradation of 3-6 mm; 74 parts of basalt broken stone with the grain size gradation of 0-3 mm; 1.3 parts of quicklime powder; 2.3 parts of mineral powder.
Construction method
Step 1, cleaning a bridge deck to be paved and carrying out leveling treatment; mixing the raw materials of the waterproof bonding layer according to the mixing proportion, wherein the mixing time is 60s, and the mixing temperature is controlled to be 185 ℃;
and 2, paving the mixture on the layer to be paved by adopting a high-power full-width paver, and paving the upper layer of the asphalt concrete by adopting a high-power full-width paver to ensure the flatness and the construction efficiency of the paved layer, so that the full-braking functions of speed, material conveying, material level, frequency, amplitude, stopping and descending prevention, starting and ascending prevention and the like are ensured in the construction process, and the paving speed is 4 m/min. The screed plate of the paver is heated 1h in advance before the asphalt sand is paved, so that the temperature of the screed plate is 110-120 ℃, and the galling phenomenon during starting paving is avoided. The advancing speed of the paver is ensured to be uniform and continuous, the material distributing screw is ensured to ensure that the height of the mixture on two sides is not less than the height of a material distributor of 2/3, and the driving speed of the paver is preferably controlled to be 3-5 m. The paving temperature is not lower than 160 ℃, and the paved mixture is checked in time in the paving process, such as white and yellow appearance and oil pocket treatment in time.
Step 3, carrying out rolling treatment on the bedding surface paved in the step 2, wherein the rolling process is divided into three stages of primary pressing, secondary pressing and final pressing; and finishing the construction of the waterproof bonding layer.
Wherein the initial pressure: the method comprises the following steps of rolling by adopting 2 13T double-steel-wheel oscillation type road rollers, rolling for 2 times by vibration, wherein the overlapping width of wheel tracks of the road rollers is about 20-30 cm, each road roller is rolled in a full width mode and is rolled from a low position of a cross slope to a high position, the rolling length is longitudinally arranged in a step mode, and the compaction speed is 6-8 km/h.
Repressing: and (3) rolling by adopting a 13T Dynapex double-steel oscillation type road roller, wherein the rolling mode of the machine is the same as the primary rolling mode, the rolling is carried out for 2 times in total, and the compaction speed is 5-7 km/h.
Final pressure: three rubber-wheeled road rollers are adopted for static pressing on two sides, and no wheel tracks on the road surface are guaranteed after static pressing.
Example 5
Raw material of waterproof bonding layer
6.9 parts of SBS modified asphalt; 23 parts of basalt broken stone with the grain size gradation of 3-6 mm; 70 parts of basalt macadam with the grain size gradation of 0-3 mm; 1.3 parts of quicklime powder; 2.3 parts of mineral powder.
Construction method
Step 1, cleaning a bridge deck to be paved and carrying out leveling treatment; mixing the raw materials of the waterproof bonding layer according to the mixing proportion, wherein the mixing time is 45s, and the mixing temperature is controlled to be 175 ℃;
and 2, paving the mixture on the layer to be paved by adopting a high-power full-width paver, and paving the upper layer of the asphalt concrete by adopting a high-power full-width paver to ensure the flatness and the construction efficiency of the paved layer, so that the full-braking functions of speed, material conveying, material level, frequency, amplitude, stopping and descending prevention, starting and ascending prevention and the like are ensured in the construction process, and the paving speed is 4 m/min. The screed plate of the paver is heated 1h in advance before the asphalt sand is paved, so that the temperature of the screed plate is 110-120 ℃, and the galling phenomenon during starting paving is avoided. The advancing speed of the paver is ensured to be uniform and continuous, the material distributing screw is ensured to ensure that the height of the mixture on two sides is not less than the height of a material distributor of 2/3, and the driving speed of the paver is preferably controlled to be 3-5 m. The paving temperature is not lower than 160 ℃, and the paved mixture is checked in time in the paving process, such as white and yellow appearance and oil pocket treatment in time.
Step 3, carrying out rolling treatment on the bedding surface paved in the step 2, wherein the rolling process is divided into three stages of primary pressing, secondary pressing and final pressing; and finishing the construction of the waterproof bonding layer.
Wherein the initial pressure: the method comprises the following steps of rolling by adopting 2 13T double-steel-wheel oscillation type road rollers, rolling for 2 times by vibration, wherein the overlapping width of wheel tracks of the road rollers is about 20-30 cm, each road roller is rolled in a full width mode and is rolled from a low position of a cross slope to a high position, the rolling length is longitudinally arranged in a step mode, and the compaction speed is 6-8 km/h.
Repressing: and (3) rolling by adopting a 13T Dynapex double-steel oscillation type road roller, wherein the rolling mode of the machine is the same as the primary rolling mode, the rolling is carried out for 2 times in total, and the compaction speed is 5-7 km/h.
Final pressure: three rubber-wheeled road rollers are adopted for static pressing on two sides, and no wheel tracks on the road surface are guaranteed after static pressing.
Test 1
In examples 1 to 5, the performance test of the waterproof bonding layer road section is carried out on a section of road section after construction is completed.
Rutting and freeze-thaw splitting are tested according to the test specification of JTG E20-2011 road engineering asphalt and asphalt mixture, wherein the fine mesh of the rutting test of the asphalt mixture is T0719-2011, and the fine mesh of the freeze-thaw splitting test is T0729-2000;
the water seepage test is carried out by a standard test of T0971-2019 (asphalt pavement water seepage coefficient test method) in JTG 3450 and 2019 (highway subgrade and pavement site test procedures).
TABLE 1
Figure BDA0003140444830000111
Figure BDA0003140444830000121
From the test results in table 1, it can be seen that the waterproof bonding layer asphalt provided by the invention adopts SBS modified asphalt, and basalt broken stones with different grain size grades are coarse and fine aggregates; the quicklime powder and the mineral powder are added into the raw material, the waterproof bonding layer has good leveling compactness, low water permeability and good waterproof effect by selecting raw material components and pertinently adjusting the mixing ratio and adopting a mechanical combination of a high-power full-width paver and a double-steel-wheel oscillation road roller in construction, and a rutting experiment shows that when the average dynamic stability is more than 2800 times/mm, the mixture has high-temperature stability. The water damage of the upper surface layer is one of the common quality problems of the asphalt pavement, the durability of the waterproof bonding layer can be improved, the water stability of the bonding layer is detected through a freeze-thaw splitting test, and the data in the table 1 show that the waterproof bonding layer provided by the invention has excellent water stability, and the freeze-thaw splitting strength ratio can reach more than 95%.
Comparative example 1
Comparative example 1 referring to the specific implementation mode of Chinese patent CN101270567A, SBS modified asphalt and a seal coat of ready-mixed macadam are paved, the same water permeability test as test 1 is carried out on the waterproof bonding layer, through the test, the water permeability of the upper layer of the SBS modified asphalt and the seal coat of ready-mixed macadam of comparative example 1 is 78ml/min, and the flatness of the upper layer is 1.19 mm. Tests show that the SBS modified asphalt and the pre-mixed crushed stone sealing layer of the comparative example 1 are poor in waterproof effect. The spreading construction is carried out by adopting the spreading vehicle, so that the spreading is uneven and the quality is difficult to control. The scattered cloth is damaged when the surface layer is paved, the displacement of the pre-mixed crushed stone layer is obvious, the anti-rutting force is weak, and the durability is also poor.
Comparative example 2
The waterproof adhesive layer of comparative example 2 was constructed by the same construction method as in example 1. The difference is that mineral powder is not added in the raw material of the waterproof bonding layer in the comparative example 2, and the raw material of the waterproof bonding layer in the comparative example 2 is 7 parts of SBS modified asphalt; 25 parts of basalt broken stone with the grain size gradation of 3-6 mm; 72 parts of basalt broken stone with the grain size gradation of 0-3 mm; and 3.0 parts of quicklime powder.
The performance of the waterproof adhesive layer of comparative example 2 was tested in the same manner as in test 1, and the test results were as follows: the flatness of the bonding layer is 1.21mm, the water seepage rate of the bonding layer is 40ml/min, and the average dynamic stability DS is 2900 times/mm; the freeze-thaw split strength ratio was 76.4%. The addition of the filler mineral powder can effectively improve the package of the asphalt on the aggregate, and ensure the stability and the dense strength of the mixed material, and in the comparative example 2, the waterproof performance, the anti-rutting performance and the water stability of the waterproof bonding layer prepared without the mineral powder are obviously reduced.
Comparative example 3
The waterproof adhesive layer of comparative example 3 was formed by the same construction method as in example 1. The difference is that the raw material of the waterproof bonding layer of the comparative example 3 is not added with quicklime powder, and the raw material of the waterproof bonding layer of the comparative example 3 is 7 parts of SBS modified asphalt; 25 parts of basalt broken stone with the grain size gradation of 3-6 mm; 72 parts of basalt broken stone with the grain size gradation of 0-3 mm; 3.0 parts of mineral powder.
The waterproof adhesive layer of comparative example 3 was subjected to a performance test in the same manner as in test 1, and the test results were as follows:
the flatness of the bonding layer is 1.23mm, the water seepage rate of the bonding layer is 52ml/min, and the average dynamic stability DS is 2544 times/mm; the freeze-thaw split strength ratio was 71.8%. Research shows that the quicklime powder is added not only under the action of a filler, but also can adjust the pH value of a mixed material and improve the wrapping force of asphalt, and the waterproof performance, the anti-rutting performance and the water stability of a waterproof bonding layer prepared without the quicklime powder are obviously reduced.
Comparative example 4
The waterproof adhesive layer of comparative example 4 was constructed by the same construction method as in example 1. The difference is that the oilstone ratio in the raw material of the waterproof bonding layer of the comparative example 4 is different from that of the example 1, and the raw material of the waterproof bonding layer of the comparative example 4 is 7.4 parts of SBS modified asphalt; 25 parts of basalt broken stone with the grain size gradation of 3-6 mm; 72 parts of basalt broken stone with the grain size gradation of 0-3 mm; 1.3 parts of quicklime powder; 1.7 parts of mineral powder.
Comparative example 4 the oilstone ratio of the waterproof bonding layer raw material was 7.4%.
The waterproof adhesive layer of comparative example 4 was subjected to a performance test in the same manner as in test 1, and the test results were as follows:
the flatness of the bonding layer is 1.18mm, the water seepage rate of the bonding layer is 38ml/min, and the average dynamic stability DS is 2566 times/mm; the freeze-thaw split strength ratio was 68.5%. Research shows that if the oilstone ratio is too high, the waterproof bonding layer is easy to be oiled, the anti-rutting capability is poor, the high-temperature stability is poor, and the water stability is greatly reduced.
Comparative example 5
The waterproof adhesive layer of comparative example 5 was constructed by the same construction method as in example 1. The difference is that the oilstone ratio in the raw material of the waterproof bonding layer of the comparative example 5 is different from that of the example 1, and the raw material of the waterproof bonding layer of the comparative example 5 is 6.5 parts of SBS modified asphalt; 25 parts of basalt broken stone with the grain size gradation of 3-6 mm; 72 parts of basalt broken stone with the grain size gradation of 0-3 mm; 1.3 parts of quicklime powder; 1.7 parts of mineral powder.
Comparative example 5 the oilstone ratio of the waterproof bonding layer raw material was 6.5%.
The waterproof adhesive layer of comparative example 5 was subjected to a performance test in the same manner as in test 1, and the test results were as follows:
the flatness of the bonding layer is 1.22mm, the water seepage rate of the bonding layer is 53ml/min, and the average dynamic stability DS is 3025 times/mm; the freeze-thaw split strength ratio was 80.6%. Research shows that the asphalt-stone ratio is too low, the asphalt saturation of the waterproof bonding layer is poor, the porosity is high, and the water seepage effect is poor.
Comparative examples 6 to 7 and examples 6 to 8
The waterproof bonding layers of comparative examples 6 to 7 and examples 6 to 8 were constructed by the same construction method as in example 1, and the raw material was also SBS-modified asphalt; basalt broken stone with the grain size gradation of 3-6 mm; basalt broken stone with grain size gradation of 0-3 mm; quicklime powder and mineral powder. 7 parts of SBS modified asphalt in the raw materials of the comparative examples 6-7 and the examples 6-8; 25 parts of basalt broken stone with the grain size gradation of 3-6 mm; 72 parts of basalt broken stone with the grain size gradation of 0-3 mm; and 3 parts of quicklime powder and mineral powder in total. The performance of the waterproof adhesive layers of comparative examples 6 to 7 and examples 6 to 8 was tested by the same method as in test 1, and the test results are shown in table 2, wherein the ratio in table 2 is the ratio of the weight of quicklime powder to the total amount of the basalt crushed stone, quicklime powder and mineral powder.
TABLE 2
Figure BDA0003140444830000141
Figure BDA0003140444830000151
A large amount of experimental researches of the inventor show that the addition amount of the quicklime powder has a close relation with the performance of the waterproof bonding layer, the addition of the quicklime can increase the wrapping performance of basalt stones and asphalt, the quicklime powder is added into the asphalt and the basalt stones through the matching of the quicklime and the mineral powder, the strength, the density and the water stability of the waterproof bonding layer can be effectively guaranteed, the pH value of a mixed material can be influenced by too little or too much quicklime powder, the wrapping force of the asphalt is reduced, and therefore the comprehensive performance of the waterproof bonding layer is greatly reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A bridge deck pavement waterproof bonding layer is characterized by mainly comprising the following raw materials,
6-8 parts of SBS modified asphalt;
23-27 parts of coarse aggregate;
70-74 parts of fine aggregate;
0.7 to 1.3 portions of quicklime powder;
1.7 to 2.3 portions of mineral powder;
wherein the coarse aggregate and the fine aggregate are basalt broken stones with different grain size grades.
2. The bridge deck pavement waterproof bonding layer according to claim 1, wherein the coarse aggregate is basalt macadam with a particle size of 3-6 mm; the fine aggregate is basalt broken stone with the grain diameter of 0-3 mm.
3. The bridge deck pavement waterproof bonding layer according to claim 1, wherein the oilstone ratio in the raw materials of the bridge deck pavement waterproof bonding layer is 6.8-7.2%.
4. The bridge deck pavement waterproof bonding layer according to claim 1, wherein in the raw materials of the bridge deck pavement waterproof bonding layer, the weight of the quicklime powder accounts for 1.0-1.4% of the total amount of the basalt broken stone, the quicklime powder and the mineral powder.
5. The bridge deck pavement waterproof bonding layer according to claim 4, wherein in the raw materials of the bridge deck pavement waterproof bonding layer, the weight of the quicklime powder accounts for 1.2% -1.34% of the total amount of the basalt broken stones, the quicklime powder and the mineral powder.
6. A method of constructing a deck-covering waterproof bonding layer according to any one of claims 1 to 5, comprising the steps of:
step 1, cleaning a bridge deck to be paved and carrying out leveling treatment;
mixing the raw materials of the waterproof bonding layer according to the mixing proportion to obtain a mixture;
step 2, spreading the mixture to be layered;
and 3, rolling the layer paved in the step 2 to finish the construction of the waterproof bonding layer.
7. The method for constructing a waterproof bonding layer for bridge deck pavement according to claim 6, wherein in the step 1, the mixing time is 20-60 s; the temperature of the raw materials of the waterproof bonding layer is controlled to be 170-195 ℃ in the mixing process.
8. The method for constructing a bridge deck pavement waterproof bonding layer according to claim 6, wherein in the step 2, the mixture is paved on a layer to be paved by using a full-width paver.
9. The method of claim 6, wherein in step 3, the rolling process is divided into three stages, namely, a first rolling stage, a second rolling stage and a final rolling stage, wherein the first rolling stage and the second rolling stage are performed by using an oscillating roller for 2-3 times, and the final rolling stage is performed by using a rubber-tyred roller for 2-3 times.
10. The method of claim 6, wherein in step 3, after the waterproof bonding layer is completed, the thickness of the waterproof bonding layer is 1.8cm to 2.2 cm.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060513A (en) * 2014-06-27 2014-09-24 南京同安道路工程有限公司 Modified asphalt graded broken stone stress absorption waterproof layer and manufacturing method thereof
CN104294732A (en) * 2014-10-20 2015-01-21 广东华盟路桥工程有限公司 High-elasto-viscosity stress absorbing layer and top facing construction process thereof
CN107043610A (en) * 2017-01-20 2017-08-15 长安大学 A kind of bridge deck water-proof tack coat material and preparation method thereof
CN110172909A (en) * 2019-06-25 2019-08-27 山东省路桥集团有限公司 Cement concrete bridge deck bilayer AC Asphalt mixture pavement structure and method for paving

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060513A (en) * 2014-06-27 2014-09-24 南京同安道路工程有限公司 Modified asphalt graded broken stone stress absorption waterproof layer and manufacturing method thereof
CN104294732A (en) * 2014-10-20 2015-01-21 广东华盟路桥工程有限公司 High-elasto-viscosity stress absorbing layer and top facing construction process thereof
CN107043610A (en) * 2017-01-20 2017-08-15 长安大学 A kind of bridge deck water-proof tack coat material and preparation method thereof
CN110172909A (en) * 2019-06-25 2019-08-27 山东省路桥集团有限公司 Cement concrete bridge deck bilayer AC Asphalt mixture pavement structure and method for paving
WO2020258631A1 (en) * 2019-06-25 2020-12-30 山东省路桥集团有限公司 Cement concrete bridge deck double-layer ac asphalt mixture paving structure and paving method

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