CN211472012U - Signal lamp crossing filling type composite pavement - Google Patents
Signal lamp crossing filling type composite pavement Download PDFInfo
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- CN211472012U CN211472012U CN201922317901.4U CN201922317901U CN211472012U CN 211472012 U CN211472012 U CN 211472012U CN 201922317901 U CN201922317901 U CN 201922317901U CN 211472012 U CN211472012 U CN 211472012U
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Abstract
The utility model discloses a signal lamp crossing pouring type composite pavement, which comprises an old road lower base layer arranged at the bottom layer and an old road upper base layer laid on the upper side of the old road lower base layer; the top surface of the upper base layer of the old road is paved with a modified emulsified asphalt seal layer, and the top of the modified emulsified asphalt seal layer is provided with a surface layer; the surface layer adopts a penetration type composite pavement, and the penetration type composite pavement comprises a matrix asphalt laying layer and a grouting material poured into gaps of the matrix asphalt laying layer; the matrix asphalt pavement layer adopts modified asphalt. The utility model provides high structural stratum resists the ability of load effect, has "just gentle characteristics of doing all can", and its high temperature stability can be superior to ordinary bituminous paving greatly, and low temperature anti-cracking performance, fatigue resistance can also all be superior to ordinary bituminous paving with antiskid wear resistance.
Description
Technical Field
The utility model relates to a road construction technical field, concretely relates to compound road surface of formula is irritated in signal lamp crossing.
Background
The asphalt mixture is a typical viscoelastic material, has high temperature sensitivity, and has large influence on the strength and rheological property due to temperature change, particularly, under the repeated action of vehicle starting, acceleration, deceleration and braking in summer high-temperature environment, the asphalt mixture can slide and displace, so that the shear deformation damage such as wave and hugging occurs, and the service performance of the pavement is reduced.
With the rapid development of economy, the traffic volume increases year by year, and the rut disease on the asphalt pavement is particularly serious on roads with more heavy-duty vehicles and signal lamp control intersections, thereby harming the driving safety of the roads and reducing the operation stability and the driving comfort of vehicles.
Disclosure of Invention
Aiming at the technical problem, the technical scheme provides the signal lamp intersection pouring type composite pavement, and the problem can be effectively solved.
The utility model discloses a following technical scheme realizes:
a signal lamp intersection pouring type composite pavement comprises an old road lower base layer arranged at the bottommost layer and an old road upper base layer paved on the upper side of the old road lower base layer; the top surface of the upper base layer of the old road is paved with a modified emulsified asphalt seal layer, and the top of the modified emulsified asphalt seal layer is provided with a surface layer; the surface layer adopts a penetration type composite pavement, and the penetration type composite pavement comprises a matrix asphalt laying layer and a grouting material poured into gaps of the matrix asphalt laying layer; the matrix asphalt pavement layer adopts modified asphalt.
Furthermore, a cement paste layer is arranged between the lower base layer of the old road and the upper base layer of the old road.
Furthermore, the modified emulsified asphalt seal comprises a lower seal paved by SBS modified emulsified asphalt and an upper seal sprayed on the upper side of the SBS modified emulsified asphalt layer; the spraying amount is 0.9-1.1 kg/m2(ii) a During construction, after each segment of SBS modified emulsified asphalt is sprayed, aggregate is immediately spread by an aggregate spreader, and the amount of the spread aggregate is 5-6 m3/1000 m2And (6) counting.
Furthermore, the surface layer adopts a GRAC-20 surface layer of 11cm penetration type composite pavement.
Furthermore, the surface layer comprises a lower surface layer arranged at the lower part of the surface layer and an upper surface layer arranged at the upper part of the surface layer; the lower layer adopts a 7cm penetration type composite pavement GRAC-20, and the upper layer adopts a 4cm SBS modified SMA-13 asphalt concrete surface layer.
Further, the porosity of the base asphalt pavement layer is 20% -28%.
Furthermore, the grouting material is prepared by stirring fine sand, cement, mineral powder and water.
Further, the grouting material is prepared by adding water into fine sand, cement, mineral powder and water according to the mixing proportion requirement, mixing for 1-2 min, and stirring until the materials are uniform.
Further, the grouting fullness degree of the grouting material is more than or equal to 96 percent, and the stability is more than or equal to 9 kN.
Further, the maximum penetration depth of the grouting material is less than or equal to 12 cm.
Furthermore, the grouting material needs to be grouted after the temperature of the pavement is reduced to below 50 ℃.
Advantageous effects
The utility model provides a pair of compound road surface of formula is irritated in signal lamp crossing compares with prior art, and it has following beneficial effect:
(1) according to the technical scheme, a composite pavement formed by pouring a special grouting agent taking cement as a main component is poured into a matrix asphalt mixture pavement, the material strength is formed by mutual embedding and squeezing action among aggregates and pouring type cement mortar, the load resisting capacity of a structural layer is improved, and the composite pavement has the characteristics of rigidity and flexibility, has the high-temperature stability which is greatly superior to that of a common asphalt pavement, and has the low-temperature anti-cracking performance, the anti-fatigue performance and the anti-skid wear-resisting performance which are also superior to that of the common asphalt pavement.
(2) The addition of the pouring material directly improves the shear deformation resistance of the pouring type composite pavement mixture, and the shear resistance of the pouring type composite pavement mixture at various temperatures is obviously higher than that of the conventional SBS modified asphalt mixture. Particularly, the pouring type composite pavement mixture still has excellent shear resistance under a high-temperature state.
(3) Compared with the common road structure, the maximum displacement of the top surface of the poured composite road surface is smaller than that of the conventional asphalt road surface structure under the action of standard axle load, which shows that the poured composite road surface has better anti-deformation capability.
(4) The rigid pouring material is added into the pouring type composite pavement mixture, so that the pouring type composite pavement mixture has higher bending tensile strength.
(5) The main factors influencing the service life of the asphalt pavement include seasons, water damage, vehicle load and the like, and the pouring type composite pavement has good high-temperature stability and still has good structural bearing capacity in a high-temperature environment, so that the service life of the pavement can be greatly prolonged.
(6) The design of the modified emulsified asphalt seal increases the waterproofness of the pavement; the water resistance and oxidation resistance of the asphalt layer are far greater than those of a common asphalt layer or a civil engineering layer.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the overall structure of embodiment 1 of the present invention.
Marking in the accessory: 1-surface layer, 11-upper surface layer, 12-lower surface layer, 2-modified emulsified asphalt seal layer, 3-old road upper base layer, 4-cement paste layer and 5-old road lower base layer.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. Under the prerequisite that does not deviate from the design concept of the utility model, the ordinary person in the art should fall into the protection scope of the utility model to the various changes and improvements that the technical scheme of the utility model made.
As shown in fig. 1-2, a signal lamp intersection pouring type composite pavement comprises an old road lower base layer 5 arranged at the bottommost layer, and an old road upper base layer 3 laid on the upper side of the old road lower base layer 5; and a cement paste layer 4 is arranged between the lower base layer 5 of the old road and the upper base layer 3 of the old road. In this embodiment, the old roadThe upper base layer 3 adopts an 18cm water-stable macadam upper base layer. The top surface of the upper base layer 3 of the old road is paved with a modified emulsified asphalt seal 2, and the modified emulsified asphalt seal 2 comprises a lower seal paved by SBS modified emulsified asphalt and an upper seal sprayed on the upper side of the SBS modified emulsified asphalt layer; the spraying amount is 0.9-1.1 kg/m2(ii) a During construction, after each segment of SBS modified emulsified asphalt is sprayed, aggregate is immediately spread by an aggregate spreader, and the amount of the spread aggregate is 5-6 m3/1000m2And (6) counting.
The top of the modified emulsified asphalt seal layer 2 is provided with a surface layer 1; the surface layer 1 adopts a penetration type composite pavement, and the penetration type composite pavement comprises a matrix asphalt laying layer and a grouting material poured into gaps of the matrix asphalt laying layer; the matrix asphalt pavement layer is made of modified asphalt, and the porosity of the matrix asphalt pavement layer is 20-28%; the grouting material is prepared by stirring fine sand, cement, mineral powder and water.
The surface layer 1 adopts a GRAC-20 surface layer of a 11cm penetration type composite pavement; or the surface layer 1 comprises a lower surface layer 12 arranged at the lower part of the surface layer and an upper surface layer 11 arranged at the upper part of the surface layer 1; the lower surface layer 12 adopts a 7cm penetration type composite pavement GRAC-20, and the upper surface layer 11 adopts a 4cm SBS modified SMA-13 asphalt concrete surface layer.
Adding water into the grouting material by adopting fine sand, cement, mineral powder and water according to the mixing proportion requirement, mixing for 1-2 min, and stirring until the materials are uniform to prepare the grouting material; the grouting fullness of the grouting material is more than or equal to 96 percent, and the stability is more than or equal to 9 kN; the maximum penetration depth of the grouting material is less than or equal to 12 cm; the grouting material needs to be grouted after the temperature of the pavement is reduced to below 50 ℃. In this example, the material and production specifications for the GRAC-20 penetration composite pavement are as follows: firstly, material requirements are as follows:
(1) asphalt: the pouring type composite pavement adopts SBS modified asphalt, and the technical requirements are detailed in the following table.
Technical requirements of SBS modified petroleum asphalt
(2) Coarse aggregate
The coarse aggregate is stone-like hard, clean and nearly cubic crushed stone with grain size larger than 2.36 mm. The crushed stones rolled by the impact crusher are adopted, and the content of the slender flat particles is strictly controlled to ensure the quality of the coarse aggregate. The coarse aggregate has two broken surfaces with a particle proportion of not less than 90%. The technical index of the coarse aggregate should meet the requirements of the following table.
Technical requirements of coarse aggregate
| Test items | Unit of | Technical requirements |
| Crush number | ％ | ≤24 |
| Los Angeles abrasion | ％ | ≤28 |
| Apparent relative density | // | ≥2.6 |
| Water absorption rate | ％ | ≤2.0 |
| Firmness of use | ％ | ≤12 |
| Content of elongated flat particles | ％ | ≤15 |
| The content of particles smaller than 0.075mm by washing | ％ | ≤1 |
| Soft stone content | ％ | ≤3 |
| Adhesion to asphalt | // | Grade not less than 4 |
(3) Fine aggregate
The fine aggregate adopts hard, clean, dry, non-weathered, non-impurity and properly graded artificially-rolled machine-made sand, and cannot adopt leftovers of a stock ground. The fine aggregate technical requirements should meet the following table requirements.
Technical requirements of fine aggregate
(4) Mineral powder
The mineral powder is obtained by processing limestone. The mineral powder should be dried and cleaned, and it should meet the following technical requirements. The dust recovered by the mixer should not be used as the ore powder.
Technical requirements of mineral powder
Secondly, the technical standard of the pouring type composite pavement mixture is as follows:
(1) matrix asphalt mixture: the gradation and technical requirements of the matrix asphalt mixture can meet the requirements of the following table.
Base asphalt mixture gradation range
Matrix asphalt mixture index requirement
| Test items | Unit of | Technical requirements |
| Number of times of compaction | Next time | Double face 50 |
| Void fraction | ％ | 20～28 |
| Marshall stability | kN | >3.0 |
| Flow value | 0.1mm | 20～40 |
| Schrenberg asphalt leakage test | ％ | ≤0.3 |
| Kentucky fly test | ％ | ≤30 |
Note: the void fraction was measured by a volume method.
(2) Potting material
The grouting material is prepared by mixing a special grouting agent and water, and the quality standard of the purchased finished grouting agent meets the following requirements.
Technical index requirements of grouting agent
| Test items | Unit of | Technical requirements |
| Degree of fluidity | s | 10～14 |
| Breaking strength (3h) | MPa | ≥2.0 |
| Compressive strength (3h) | MPa | ≥10.0 |
(3) Performance verification of pouring type composite pavement mixture
After the design of the matrix asphalt mixture and the design of the filling material are completed, the designed filling material needs to be uniformly filled into the matrix asphalt mixture to form the filling type composite pavement mixture. The filling type composite pavement mixture should meet the technical index requirements of the following table.
Technical index requirements of pouring type composite pavement mixture
Thirdly, the construction requirements of the GRAC-20 penetration type composite pavement are as follows:
(1) inspection and cleaning of the underlying surface
Before the construction of the asphalt layer, the inspection and cleaning of the lower horizontal layer are carried out, the engineering quality such as the plane line type, the elevation, the flatness, the width and the like of the lower layer is inspected, and the local quality defects (such as serious segregation and cracking, loosening caused by oil stains and the like) of the lower layer are repaired according to the regulations.
The floating mineral aggregate on the surface of the lower layer is swept to the outside of the road surface, and the surface sundries are also swept clean. The dust should be washed in advance and blown clean.
Before the upper surface layer is laid, the surface of the lower surface layer is thoroughly cleaned, soil sundries in the grooves are removed, adhesive layer asphalt is uniformly sprayed after air drying, an imported intelligent spraying machine is preferably used for spraying the asphalt, and the construction process is executed according to relevant regulations. After the asphalt of the sticky layer is sprayed, traffic control is carried out, any vehicle is forbidden to pass and personnel are forbidden to tread, and the surface layer can be paved only when the wheels are not stuck.
Before construction, the construction machine is comprehensively checked and adjusted to ensure that the equipment is in a good state, and especially the metering equipment of a mixing plant, a paver and a road roller, such as an electronic scale, an automatic leveling device and the like, needs to be calibrated in a metering way. The system has sufficient power supply and backup equipment, and ensures that production is not interrupted due to power failure or failure of certain equipment in one construction working day.
(2) Construction of pouring-in type composite pavement matrix asphalt mixture
The construction of the pouring type composite pavement is divided into two parts, firstly, a matrix asphalt mixture is paved, then, a pouring material is mixed and grouted to form the pouring type composite pavement. The construction of the matrix asphalt mixture comprises four parts of production, transportation, paving and rolling.
(3) Production of matrix asphalt mixture
1. The proportion and the gradation of the matrix asphalt mixture.
The mineral aggregate gradation of the matrix asphalt mixture meets the control range requirement of the production mix proportion. The dosage of the mixture asphalt: the oil-stone ratio is controlled to be-0.2% and + 0.2%.
2. The base asphalt mixture must be mixed in an asphalt mixing plant using a mixing machine.
3. The matrix asphalt mixture is mixed by a gap type mixer, the mixer has sealing performance for preventing the mineral powder from flying and scattering, dust removing equipment, a device for detecting the mixing temperature and an automatic printing device. During the mixing process, the consumption of asphalt and various mineral materials and the mixing temperature are printed one by one, and the metering and temperature measurement of the mixing plant are checked regularly.
4. The mixing time of the asphalt mixture is determined by uniformly mixing the mixture and coating all the mineral aggregate particles with the asphalt cement. In production, the asphalt is firstly dry-mixed for 5-10 seconds, and then added with the asphalt for wet mixing for 35-40 seconds.
5. The base asphalt mix temperature can be given the values listed in the table below.
Mixing temperature of matrix asphalt mixture
6. The mixture stirred by a mixing plant is uniform and consistent, has no white material, no agglomeration or serious separation of coarse and fine materials, and cannot be used when the mixture does not meet the requirement.
(4) Spreading of matrix asphalt mixture
1. Before paving, the working surface must be cleaned, such as by water washing, and the paving operation can be carried out only after the working surface is dried in the sun.
2. The mixture must adopt mechanical paver, should check and confirm the quality of the lower floor before spreading, when the quality is unqualified, must not carry on the paving operation. The paver should be adjusted to an optimum condition to make the pavement uniform and consistent without segregation.
3. The paver for carrying out the work must have a device for automatically adjusting the thickness and leveling, and must have a preliminary compacting device such as a vibrating screed or a vibrating ram. Preferably, a mobile self-leveling reference device is used.
4. The spreading speed of the spreading machine is adjusted to be balanced with the feeding and compacting speeds, so that continuous and balanced spreading is ensured, and the middle part is not stopped.
5. The asphalt mix paving temperature is shown in the following table, and the mix temperature is measured when the truck is unloaded onto the paver. When the road surface temperature is lower than 15 ℃, the rubber powder and asphalt mixture is not suitable to be paved.
6. The loose paving coefficient of the asphalt pavement is determined according to a trial paving section, generally 1.05-1.10, the thickness of the paving layer, a road arch and a cross slope are checked at any time in the paving process, and the loose paving coefficient is adjusted immediately when the paving layer cannot meet the requirements.
7. The skip car should be kept covered during the spreading process to reduce the temperature loss of the mixture.
Temperature for paving and rolling matrix asphalt mixture
| Temperature requirement | |
| Temperature of mixed material in hopper of paver and DEG C | ≥165 |
| Temperature (initial pressure) of freshly spread layer (C) | ≥150 |
| End temperature of initial pressure,. degree.C | ≥130 |
| Final pressure temperature,. degree.C | ≥100 |
| Road surface temperature for filling of filling material | ≤50 |
(5) Rolling of base asphalt mixture
The filling type composite pavement is a pavement structure formed by filling a filling material in a matrix asphalt mixture, so that the quality management in the aspects of skeleton void ratio, flatness and the like is strictly controlled in the laying of the matrix asphalt mixture with large gaps, and proper compaction machinery and rolling times are selected. If the condition is met, wide paving equipment is selected as much as possible, so that seam marks can be reduced, and the pavement flatness can be guaranteed. In order to prevent the filling material from permeating due to surface blockage, a double-steel-wheel road roller is preferably used for laying the matrix asphalt mixture during initial pressing and secondary pressing, a rubber-wheel road roller is not suitable to be used as a rolling tool, and vibration compaction is not generally used. The rolling times are less than those of common asphalt mixture, but when the temperature of the mixture is reduced to about 80 ℃, leveling rolling is carried out to eliminate wheel marks. The roller should roll at a slow and uniform rate and the appropriate rolling speed for the roller is recommended in the following table.
Road roller rolling speed (km/h)
| Road roller type | Initial pressure | Repression | Final pressure |
| Steel wheel |
2～3 | — | 3～6 |
| |
2～4 | 3～4 | — |
The width of the adjacent rolling belts is 1/3-1/2 wheels overlapped during static pressure of the road roller and is not less than 1/4 wheels, and the width of the adjacent rolling belts is not more than 15-20 cm during vibration. The driving wheel is required to face the direction of the paver to prevent the mixture from moving. The starting and stopping of the road roller must be slowly reduced.
Obvious marks are set for the sections of initial pressure, final pressure and re-pressure, which is convenient for the driver to recognize. Special posts are required to be arranged for managing and checking the loose paving thickness, the rolling sequence, the combination of the road roller, the rolling times, the rolling speed and the rolling temperature, so that no pressure leakage and no overpressure are realized. The combination and rolling mode of the compacting equipment can be required according to the following table.
Construction compaction equipment combination and rolling scheme
(6) Seam disposal
1. The transverse construction joint is a flat joint, and the joint cutting time is preferably carried out before the mixture is cooled and hardened. The original pavement is sawn to be even by a joint cutter to form a vertical joint surface, the vertical joint surface is smeared by hot asphalt, then the pavement is transversely rolled by a road roller, the road roller is positioned on the compacted surface layer during rolling, 15cm of a new laying layer is missed, then the pavement is moved for 15-20 cm after being pressed once, until the pavement is completely laid on the new laying layer, and then the longitudinal rolling is carried out. If other rolling methods are used, the transverse seam is ensured to be smooth and compact.
2. Attention should be paid particularly to the flatness of the transverse joint and the slit position should be determined by a 3m ruler measurement.
3. The construction joints and the joints at the two ends of the structure must be carefully operated to maintain a tight and smooth structure.
After the matrix asphalt pavement is formed, non-construction vehicles cannot go on the road and are cooled to normal temperature under the condition that traffic is completely closed, and sand, dirt and the like are prevented from being attached to the pavement to block gaps, so that the filling effect of the filling material is influenced.
In addition, in order to prevent the injected material from penetrating into the base layer below the large-gap base asphalt mixture pavement layer, the compactness of the base layer needs to be carefully checked before the pavement, and an isolation layer can be added if necessary.
Fourthly, manufacturing and grouting of grouting material
(1) Manufacture of potting Material
The potting material is typically fabricated in situ. In order to ensure accurate proportioning of each material, fine sand, cement, mineral powder and the like can be uniformly dry-mixed according to a certain proportion, weighed, bagged and transported to the site. And adding water according to the mixing proportion requirement on site, mixing for 1-2 min, and stirring until the materials are uniform, thereby preparing the filling material. According to the engineering scale, a special movable mixing equipment vehicle suitable for manufacturing and filling the filling material is selected for construction; commercial mortar meeting performance requirements can also be purchased.
(2) Filling of filling material
After the temperature of the pavement is reduced to below 50 ℃, firstly, core drilling and sampling are carried out, and the void ratio of the matrix asphalt mixture of the paved and poured composite pavement is measured. The flow degree of the filling material is controlled by taking the filling material as a parameter for controlling the dosage of the filling material and the design of technical indexes so as to ensure the infiltration of the filling material. The using amount of the filling materials for penetration is determined by calculation according to factors such as penetration depth, porosity of the matrix open-graded asphalt mixture, mortar loss rate and the like, wherein the mortar loss rate is about 10-15% generally. And after the paved large-gap matrix asphalt mixture is confirmed to be cooled to below 50 ℃, grouting the grouting material with the designed dosage as soon as possible after the grouting material is stirred, wherein the grouting material is generally used within 5-15 min after stirring so as to avoid influencing the permeation effect of the grouting material. Therefore, the pouring type composite pavement requires that the connection among all the working procedures is quicker and more compact.
The filling of the filling material is carried out according to the following construction procedures:
1. at least 1 cement mixer, 4 trolleys, 3 plate compactors and 1 sprinkler are equipped on site, wherein the production of mortar is not less than 3 persons, the transportation of trolleys is not less than 4 persons, the plate compactor is operated by 3 persons, and the site constructor is not less than 3 persons;
2. during grouting, the grouting material should be repeatedly paved on the surface of the large-gap matrix asphalt mixture pavement layer, and the grouting material should be naturally and thoroughly dredged by repeatedly dragging the grouting material with a rubber road harrow. In order to make the poured pouring material more uniform and compact; when the road surface has a longitudinal slope, mortar is spread from a low position to a high position to prevent the grouting material from causing poor infiltration effect due to rapid flow.
3. In order to better enable the pouring materials to be poured into the matrix asphalt, a plate compactor is adopted for auxiliary construction, and during construction, vibration equipment needs to be used for vibrating back and forth until the poured mortar is vibrated until the poured mortar does not flow downwards any more. And pouring the poured materials into the pavement at each position for three vehicles during site construction, grouting in a pouring-vibration-pouring mode on site, and immediately vibrating for 1-2 times in a transverse zigzag manner by adopting a flat tamper after the poured materials are poured. Until the poured mortar is vibrated to no longer flow downward. In the vibration process, leakage vibration and less vibration are strictly avoided.
4. And the vibration is immediately strengthened for the place where the irrigation is not smooth. The place where the pouring material flows is vibrated immediately to avoid the pouring material from solidifying on the surface and blocking the pores in the matrix asphalt.
(3) Surface treatment of poured composite pavement
After the permeation is finished, the residual pouring material on the surface of the asphalt pavement is cleaned by the rubber road rake, so that the unevenness of the asphalt surface of the matrix is preferably exposed, the situation that the appearance of the pavement is possibly influenced to a certain degree once the pouring material is remained on the paving surface is prevented, and the skid resistance of the pouring type composite pavement is reduced. The surface can be cleaned before initial setting after the filling of the filling material is finished; the retarder can also be sprayed on the road surface, and finally, the mortar on the surface is washed clean by water before the material is poured into the road surface for final setting. Therefore, the strength of the lower cement paste can be ensured, and the uniformity of the road surface color can be ensured.
(4) Filling type composite pavement open traffic
After the construction of the pouring type composite pavement is finished for 1 day, a layer of pavement can be laid; if the upper layer of pavement cannot be constructed temporarily, the poured composite pavement needs to be closed for 2-3 days, and then the traffic can be opened; if the early strength cement is used in the mortar or the early strength agent is added, the traffic can be expected to be opened after hours. And opening the traffic after the mortar is hardened.
Fifthly, other attention points
The poured composite pavement may have different pavement performance due to the difference of the material and the mixing ratio, so that the characteristics of the poured composite pavement must be sufficiently grasped during construction. Because the types of the added materials and the poured materials are different and the attention points in construction are different, the construction must be carried out according to the design specifications, and the general attention points are as follows:
(1) if the asphalt consumption in the matrix asphalt mixture is controlled well, the phenomenon of oil accumulation at the bottom of the surface layer of the matrix asphalt mixture can occur due to the excessive asphalt consumption, so that the filling depth of the filling material is influenced;
(2) the rolling of the matrix asphalt mixture is preferably performed by a steel wheel road roller, and the gap is easily blocked by a tire type road roller;
(3) the pouring construction of the pouring material must be carried out when the temperature of the road surface is reduced to below 50 ℃. Otherwise, too high a temperature would cause the potting material to harden rapidly. At the same time, the surface of the road must be ensured to be clean;
(4) attention is paid to strictly sealing traffic in the initial stage to prevent rainwater from washing and dirt from blocking gaps;
(5) the filling material needs to be spread quickly enough at one time, and secondary material supplement after hardening is avoided as much as possible;
(6) when the vibratory roller is used for assisting mortar penetration, the running speed and the rolling frequency of the roller are controlled to enable the mortar to slowly infiltrate downwards so as to avoid splashing of the mortar caused by quick running;
(7) after grouting, the excess mortar should be quickly scraped off to ensure that the poured composite pavement has an ideal surface structure depth.
In this example, the material and production requirements of the modified emulsified asphalt seal are as follows: firstly, material requirements are as follows:
1. bituminous material
The lower sealing layer of the asphalt pavement adopts SBS modified emulsified asphalt, and the spraying amount is 0.9-1.1 kg/m2After each section of emulsified asphalt is sprayed, immediately spreading aggregates by using an aggregate spreader, wherein the amount of the spread aggregates is 5-6 m3/1000m2And (6) counting. The technical requirements for the asphalt material for the lower seal are given in the table below, and the aggregate placement is completed before the emulsified asphalt is broken.
Technical requirements of SBS modified emulsified asphalt
2. Aggregate
Artificially rolled rice sand consisting of hard, clean, dry, non-weathered and non-impurity particles with proper gradation is adopted, the lithology is preferably limestone, and the specification S14(3 mm-5 mm) aggregate gradation requirement is shown in the following table.
Aggregate grading requirements
3. Asphalt seal construction
And (3) finishing the base course curing period, and after the base course curing period is qualified, constructing the asphalt seal layer by adopting a single-layer asphalt surface treatment method, preferably constructing in dry and hotter seasons, finishing the construction in a period of reaching the highest temperature of less than 15 ℃ in a half month and before rainy season, wherein the thickness of the seal layer is not less than 6mm, and the seal layer is required to be completely water-tight.
(1) The quality of the SBS modified emulsified asphalt and aggregate must meet specifications. Determining the spraying amount of the emulsified asphalt according to the actually measured asphalt content; special attention is paid to the fact that the fraction of aggregates smaller than 0.6mm must not exceed the specifications.
(2) It is suitable to adopt the combined operation of an asphalt spreader and an aggregate spreader. The SBS modified emulsified asphalt should be sprayed evenly, and the amount of the SBS modified emulsified asphalt meets the specification. Before spraying, the top surface of the base layer is preferably sprayed with a little water for wetting. During construction, the spraying temperature of the emulsion is determined after trial spraying according to the ambient temperature. Measures are taken for starting and stopping to avoid excessive spraying amount; the longitudinal and transverse lap joints are made into the emulsified asphalt without excessive spraying and leakage. The emulsified asphalt with excessive local spraying amount is scraped off, and manual sprinkling is applied to the place with leakage spraying.
(3) The aggregate spreading should be done before the emulsified asphalt is broken. The aggregate should be uniformly spread. When the aggregate is used up, the surface of the base layer at the material pile must be cleaned and blown clean, and then the emulsified asphalt can be sprayed. If the temperature is higher, the aggregates which are scattered for preventing the wheels from being stuck can be cleaned before paving the lower surface layer of the asphalt.
(4) After the aggregate is scattered, rolling can be carried out. The lower sealing layer of the asphalt pavement is preferably rolled by a rubber-wheel roller, and if a steel-wheel roller is used, the lower sealing layer is preferably light and cannot crush aggregates. When wheel sticking occurs at the local exposed black part, a small amount of aggregate should be additionally scattered.
(5) And (5) closing traffic after rolling, and allowing engineering vehicles to pass and carrying out upper layer construction after natural curing for 7 days.
Claims (5)
1. A signal lamp crossing pouring type composite pavement comprises an old road lower base layer (5) arranged at the bottommost layer and an old road upper base layer (3) paved on the upper side of the old road lower base layer (5); the method is characterized in that: the top surface of the upper base layer (3) of the old road is paved with a modified emulsified asphalt seal layer (2), and the top of the modified emulsified asphalt seal layer (2) is provided with a surface layer (1); the surface layer (1) adopts a penetration type composite pavement, and the penetration type composite pavement comprises a matrix asphalt laying layer and a grouting material poured into gaps of the matrix asphalt laying layer; the matrix asphalt pavement layer adopts modified asphalt.
2. The signal lamp intersection pouring-in type composite pavement according to claim 1, characterized in that: the surface layer (1) adopts a 11cm penetration type composite pavement GRAC-20 surface layer.
3. The signal lamp intersection pouring-in type composite pavement according to claim 1, characterized in that: the surface layer (1) comprises a lower surface layer (12) arranged at the lower part of the surface layer and an upper surface layer (11) arranged at the upper part of the surface layer (1); the lower surface layer (12) adopts a 7cm penetration type composite pavement GRAC-20, and the upper surface layer (11) adopts a 4cm SBS modified SMA-13 asphalt concrete surface layer.
4. A signal light intersection pouring type composite pavement according to any one of claims 1 to 3, characterized in that: the porosity of the base asphalt pavement layer is 20-28%.
5. The signal lamp intersection pouring-in type composite pavement according to claim 1, characterized in that: the modified emulsified asphalt seal layer (2) comprises a lower seal layer paved by SBS modified emulsified asphalt and an upper seal layer sprayed on the upper side of the SBS modified emulsified asphalt layer; the spraying amount is 0.9-1.1 kg/m2。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112609529A (en) * | 2020-11-09 | 2021-04-06 | 湖南中车智行科技有限公司 | Road maintenance method |
| CN113622247A (en) * | 2021-08-13 | 2021-11-09 | 浙江固路交通科技有限公司 | Low-carbon rapid maintenance paving method for asphalt pavement track |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112609529A (en) * | 2020-11-09 | 2021-04-06 | 湖南中车智行科技有限公司 | Road maintenance method |
| CN113622247A (en) * | 2021-08-13 | 2021-11-09 | 浙江固路交通科技有限公司 | Low-carbon rapid maintenance paving method for asphalt pavement track |
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