CN101250845A - Large grain diameter water permeability asphalt mixture novel pavement structure and laying method thereof - Google Patents
Large grain diameter water permeability asphalt mixture novel pavement structure and laying method thereof Download PDFInfo
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Abstract
The invention discloses a novel road surface structure with large particle diameter water permeability bitumen mixture and a method for laying thereof, which solves diseases such as problems of reflection crevice, pit groove and pump mud and the like which are brought from that current express-way only adopts a semi-rigid basal layer and a traditional bitumen layer, and has the advantages of simple structure, good water permeability, thereby being not easy to occur breakage of early water and being capable of efficiently increasing life time of the road surface and the like. The novel road surface structure comprises a basal layer which is consecutively provided with a large particle diameter water permeability bitumen mixture layer and at least a bitumen layer, wherein the large particle diameter water permeability bitumen mixture layer is made of one-stone coarse aggregates with the particle diameter of 25mm-62mm to form a frame and be mixed with a proper quantity of filling fine aggregates with the particle diameter of 0-4.75mm and bituminous cement to form the frame type bitumen mixture, and the thickness of each bitumen layer is not above the thickness of the large particle diameter water permeability bitumen mixture layer.
Description
Technical field
The invention belongs to the Communication and Transportation Engineering field, relate to a kind of newly-built, reconstruction, medium-capital overhauling engineering that is used for speedway, state's provincial trunk highway, town road, form novel Pavement Structure Combination, relate in particular to a kind of large grain diameter water permeability asphalt mixture novel pavement structure and laying method thereof.
Background technology
At present the highway in China total kilometrage that is open to traffic has been broken through 2,000,000 kilometers, wherein flexible pavement has accounted for great majority, owing to reasons such as economy, technology, be the primary structure form of having built flexible pavement at present based on the semi-rigid asphalt pavement of lime stabilization class and cement stabilized type.Semi-rigid type base makes flexible pavement have advantages of high bearing capacity because its bulk strength height, plate body are good, and material obtains easily, for the integral level that improves the highway in China traffic plays a significant role.
Built semi-rigid asphalt pavement after use after a while, must overlay transformation,, especially after early stage infringement appears in the road surface, overlayed and often transform more early to recover the function of use on road surface.The overlay scheme that old asphalt pavement is commonly used is to lay semi-rigid type base thereon, re-lays asphalt surface course, and this kind overlay scheme has advantages such as structural bearing capacity is strong, structural material simplicity of design; Engineering quantity is big, the elevation increase is many but also exist simultaneously, and the shortcomings such as surface material of failing to make full use of old pavement.Particularly can not avoid reflection crack and defective that can't draining, make to overlay the possibility that the road surface, back faces early stage infringement again.
Along with to the deepening continuously of semi-rigid type base understanding, it is further enlarged the restriction that trend of application more and more is subjected to self weakness.At first, the thermal cracking of semi-rigid type base and dry shrinkage and cracking and the reflection crack that causes are difficult to avoid, secondly because the compactness of semi-rigid type base, can't get rid of in the bitumen layer and infiltrate water on the semi-rigid type base, the accumulating of moisture caused the damage by water evil of the washing away of substrate surface, purt slurry and bituminous mixture.
Studies have shown that in a large number, adopt LSPM can effectively prevent the generation of reflection crack, and can discharge the moisture of road structure inside, avoid the destruction of moisture lower floor or asphalt surface course; LSPM has the ability of higher modulus and resistance to deformation in addition, can be directly used in the deck of reinforcement of old road or new road construction.
Summary of the invention
Purpose of the present invention is exactly only to adopt semi-rigid type base to add the disease that the traditional asphalt layer is brought in order to solve present speedway, as problems such as reflection crack, hole groove, purt mud, provide a kind of have simple in structure, good water permeability, early water be difficult for taking place damage, can effectively prolong the large grain diameter water permeability asphalt mixture novel pavement structure and the laying method thereof of advantage such as service life of road surface.
For achieving the above object, the present invention adopts following technical scheme:
A kind of large grain diameter water permeability asphalt mixture novel pavement structure, it comprises basic unit, is provided with LSPM layer and one deck bitumen layer at least in the described basic unit successively; Wherein the LSPM layer forms skeleton by the simple grain of particle diameter 25mm-62mm footpath coarse aggregate and mixes with bituminous cements with the filling fine aggregate of an amount of 0～4.75mm particle diameter and the framework type asphalt mixture formed, and each bitumen layer thickness is not more than the LSPM layer thickness.
Described bitumen layer is the different three layers of pitch of upper, middle and lower of different layers of asphalt up and down of particle diameter or particle diameter.
Described basic unit is old asphalt pavement or old cement concrete pavement or rubblization and presses cement concrete pavement or semi-rigid type base after steady.
Described LSPM layer by weight, coarse aggregate: fine aggregate: asphaltum with high viscosity cementitious matter=70: 27: 3.
Described LSPM layer thickness is 8-18cm.
A kind of laying method of large grain diameter water permeability asphalt mixture novel pavement structure,
1) basic unit is carried out preliminary treatment;
2) with the simple grain of particle diameter 25mm-62mm footpath coarse aggregate and an amount of particle diameter be 0～4.75mm fine aggregate and bituminous cements composition compound by weight ratio be to mix and stir at 70: 27: 3, pitch adopts heat-conducting oil heating when mixing and stirring, heating-up temperature is between 170--180 ℃, coarse aggregate and fine aggregate heating-up temperature should be than the high 10--20 of asphalt temperature ℃, the appearance temperature of evenly mixing and stirring compound should be controlled at 170-185 ℃, and the mixing time is 45s at least;
3) paver carrying out slowly, even, continual once paving greater than the speed of 2m/min, and its thickness is 8-18cm;
4) compound is carried out compacting, form the LSPM layer;
5) lay at least one layer of bitumen layer then on the LSPM layer, its thickness is not more than the LSPM layer thickness, finishes road surfacing.
In the described step 1),
When basic unit is semi-rigid newly-built road surface, its preprocessing process is that road pavement cleans with smooth, the spreading mulseal, on priming oil, adopt individual layer pitch table place as seal and close water layer, specific practice is for using No. 90, bi tumenf orr oad or No. 70 heated bitumens as binding material, adopt the heated bitumen spreader to construct, asphalt content is 1.3-1.5kg/m
2, spreading 5-10mm rubble spills the intact pneumatic-tired rollers that adopt later on of cloth at aggregate chips and rolls, so that aggregate chips embeds among the pitch then;
When basic unit was old asphalt pavement, the part of heavy damages such as the hole groove that should carry out the protobitumen road surface is occurred, loose, depression was mended processing by replacing a damaged part, the place of mending by replacing a damaged part employing dense-graded asphalt concrete backfill compacting;
Basic unit is old cement concrete pavement or rubblization and when pressing cement concrete pavement after steady, when the panel fragmentation seriously being occurred, edges of boards plate angle is broken and cheats the hole, the crack should excavate, adopt cement concrete or dense-graded asphalt concrete to carry out backfill compacting then, should adopt mud jacking to handle for plat-bottom escape, purt mud and depression part, for needing rubblization to handle or pressing the steady cement concrete pavement of handling, carry out rubblization or press steady the processing;
Seal down is being set to former pavement patching and after finishing dealing with.
In the described step 3), the coefficient of loose laying of compound is between 1.18-1.20 when spreading out and putting on.
In the described step 4), compaction process is, when adopting two tandem vibratory rollers, temperature should be controlled between the 165-175C during first pressing, and the first pressing first pass static pressure that advances retreats vibration; Second time forward-reverse is the pressure of shaking, compacting speed is preferably 1.5-2km/h, road roller adopts high frequency to carry out compacting by a narrow margin, the adjacent belt wheel mark that rolls overlaps to about 20cm, and watering device is interrupted watering, after the vibration, pneumatic-tired rollers roll 1-2 time again, promptly can catch up with light subsequently, catch up with light can adopt 7-11 ton steel roller, speed-controllable is built in 3-4km/h.
Roll when adopting pneumatic-tired rollers to follow the tracks of immediately following paver, spill low amounts of water at first, tyre temperature then need not be sprinkled water after raising by the time; After pneumatic-tired rollers compacting one time, make the cage construction of compound become closely, repeat aforementioned compacting process with vibratory roller again and get final product.
The present invention is based on the large grain diameter water permeability asphalt mixture novel pavement structure of semi-rigid type base.It has laid LSPM layer and one deck bitumen layer at least on traditional semirigid structure layer, the LSPM layer can play restrain the semi-rigid type base reflection crack, strengthen the deck draining alleviate damage by water bad, improve that cracking resistance, anti-rut, anti-damage by water are bad, effect such as antifatigue, prolongation road structure application life.
LSPM (Large Stone Porous asphalt Mixes LSPM, hereinafter to be referred as LSPM) be meant that the compound nominal maximum aggregate size is greater than 26.5mm, have certain void content and moisture freely can be discharged the bituminous mixture of road structure, LSPM is usually as the basic unit in the road structure.New theory has been adopted in the design of LSPM, consider from the grating design angle, LSPM should be a kind of novel bituminous mixture, and directly being gathered materials by the simple grain of greater particle size (25mm-62mm) usually forms skeleton and formed the framework type asphalt mixture of filling and forming by a certain amount of fine aggregate.LSPM is designed to half-open grating or open gradation.Because LSPM has good drainage effect, is generally half-open grating (void content is 13-18%).It is different from general bituminisation macadam-aggregate mix (ATPB) basic unit, also is different from close-graded pitch stabilization gravel compound (ATB).Bituminisation rubble (ATPB) coarse aggregate has formed the skeleton embedding and has squeezed, it does not have fine aggregate to fill basically, so void content is very big, generally greater than 18%, have extraordinary permeable effect, but because not have fine aggregate to fill excessive its modulus of void content lower and durability is relatively poor.Close-graded pitch stabilization gravel compound (ATB) also has good cage construction, and void content is generally at 3-6%, so it does not have drainage performance.The LSPM grating is through strict design, it has formed the embedding of single particle size skeleton and has squeezed, and adopt a small amount of fine aggregate to fill, improve compound modulus and durability, satisfying the void content that reduces compound under the prerequisite of drainage requirement, its void content is generally 13-18%, so it had not only had good drainage performance but also tool high modulus and durability.
The present invention has the following advantages:
(1) the good LSPM of grating can resist bigger plasticity and shear strain, bears the effect of heavily loaded traffic, has rutting resistance preferably, has improved the high-temperature stability of flexible pavement; Particularly, when the road surface bearing capacity that needs is higher, designs good LSPM and compare, demonstrate fairly obvious permanent deformation resistance with traditional bituminous concrete for low speed, loaded vehicle highway section.
(2) LSPM has good drain function, can have the function of surface drainage layer concurrently.
(3) because LSPM has bigger particle diameter and bigger space, it can reduce reflection crack effectively.
(4) big particle diameter gathers materials increases minimizing with the breeze consumption, reduces specific area, has reduced the total consumption of pitch, thereby has reduced construction costs.
(5) compare with common semi-rigid type base, improved engineering construction speed, reduced the equipment input.
(6) in the overhaul alteration work, can shorten the close traffic time greatly, economic results in society are remarkable.
Description of drawings
Fig. 1 is the structural representation of embodiments of the invention 1;
Fig. 2 is the structural representation of embodiments of the invention 2;
Fig. 3 is the structural representation of embodiments of the invention 3.
Wherein, 1. basic unit, 2. LSPM layer, 3. bitumen layer.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Embodiment 1:
Among Fig. 1, its basic unit 1 is an old asphalt pavement, lays the LSPM layer 2 of one deck 10-15cm on the basis on this road surface, and then lays three layers of bitumen layer 3 that particle diameter is different thereon more successively, and its gross thickness is at 16-18cm.
Or its basic unit 1 is express highway pavement, lays the LSPM layer 2 of one deck 10-15cm thereon, and then lay successively thereon three layers of particle diameter different bitumen layer 3, wherein thickness is 16-18cm.
Or its basic unit 1 is particle diameter road surface bigger than normal behind the old cement concrete rubblization, lays the LSPM layer 2 of one deck 10-12cm thereon, and then lay thereon three layers of particle diameter different bitumen layer 3, wherein thickness is 16-18cm.
Or its basic unit 1 is semi-rigid type base, lays the LSPM layer 2 of one deck 15cm thereon, and then lay thereon three layers of particle diameter different bitumen layer 3, wherein thickness is followed successively by 4cm, 6cm, 8cm from top to bottom.
Embodiment 2:
Among Fig. 2, its basic unit 1 is an old asphalt pavement, lays the LSPM layer 2 of one deck 10-15cm on the basis on this road surface, and then lays two layers of bitumen layer 3 that particle diameter is different thereon more successively, and its gross thickness is at 10-12cm.
Perhaps 1 lay the LSPM layer 2 of one deck 8-10cm in the basic unit on this road surface, and then lay two layers of bitumen layer 3 that particle diameter is different thereon more successively, its gross thickness is at 8-10cm.
Perhaps its basic unit 1 is an express highway pavement, lays the LSPM layer 2 of one deck 10-12cm thereon, and then lay successively thereon two layers of particle diameter different bitumen layer 3, wherein thickness is 10-12cm.
Perhaps its basic unit 1 is old cement concrete pavement, lays the LSPM layer 2 of one deck 8-12cm thereon, and then lay successively thereon two layers of particle diameter different bitumen layer 3, wherein thickness is 10-12cm.
Perhaps its basic unit 1 is particle diameter road surface bigger than normal behind the old cement concrete rubblization, lays the LSPM layer 2 of one deck 8-12cm thereon, and then lay thereon two layers of particle diameter different bitumen layer 3, wherein thickness is 10-12cm.
Embodiment 3:
Among Fig. 3, its basic unit 1 is an old asphalt pavement, lays the LSPM layer 2 of one deck 8-10cm on the basis on this road surface, and then lays the different bitumen layer of one deck particle diameter 3 thereon more successively, and its gross thickness is at 4-6cm.
Perhaps its basic unit 1 is old cement concrete pavement, lays the LSPM layer 2 of one deck 8-12cm thereon, and then lay thereon one deck particle diameter different bitumen layer 3, wherein thickness is 4-6cm.
The performance of LSPM layer 2 has:
1 high-temperature stability
LSPM is that the type compound is squeezed in the embedding of single particle size skeleton, 9.5mm above coarse aggregate ratio is about 70%, having formed complete skeleton embedding squeezes, therefore have good high-temperature stability, studies show that the more rational LSPM of design solves one of most economical valid approach of high temperature rut problem under the heavily loaded traffic.
2 water stabilities
Bituminous mixture is under the immersion condition, because the adhesion of pitch and mineral aggregate reduces, the whole mechanical strength that shows as compound reduces.Especially for LSPM, because hole is bigger, asphalt content is few, and the contact point between the mineral aggregate lacks than the plain asphalt compound, more should consider water stability.In order better to guarantee the water stability of compound, should adopt the modified bitumen (as MAC, SBS modified bitumen) of viscosity higher for the cementitious matter of LSPM, can form thicker asphalt membrane, the thickness that can make asphalt membrane is greater than 12 μ m.A large amount of experimental studies show that LSPM has good water stability.
3 fatigue behaviours
The fatigue cracking of flexible pavement also is one of topmost failure mode of flexible pavement, thereby the fatigue behaviour of bituminous mixture is subjected to researcher's extensive concern always.Flexible pavement stands the effect repeatedly of wheel load between the operating period, and its stress or strain are in the crossover variable condition for a long time, cause pavement structural strength to descend gradually.After the load repeat function surpasses certain number of times, the stress that produces in the road surface under load action will surpass the structure reactance after pavement structural strength descends, produce fatigue cracking in punishment layer bottom, road surface, under load continuation effect, fracture propagation to road surfaces forms fatigue crack.
LSPM is that the type compound is squeezed in embedding, and the coarse aggregate ratio is very big, asphalt content is lower, void content is bigger, so its fatigue behaviour is low than close-graded, compact type asphalt mixture, but suitable with close-graded pitch stabilized macadam base (ATB) fatigue behaviour.When big tensile stress appears in checking computations LSPM layer, can adopt following two kinds of methods to improve the structure anti-fatigue performance:
(1) carries out the Pavement Structure Combination design meticulously, allow the LSPM layer be in pressurized zone, do not occur tensile stress basically;
(2) under the LSPM layer, set up particulate formula bituminous mixture antifatigue layer.
4 permeance properties
One of major function of LSPM is rapidly the water that infiltrates in the road surface to be discharged rapidly, when LSPM reaches 13% when void content, the transmission coefficient of compound is undergone mutation, transmission coefficient changes not obvious after 18% and void content reaches, general transmission coefficient be from 0.01cm/s to 1.0cm/s between, can satisfy the requirement of compound drainage performance this moment, even and reach 10% for close-graded bituminous mixture void content, the order of magnitude of its transmission coefficient is generally 10
-5, this permeance property that is to say compound is not only relevant with void content, and more important is relevant with the connectivity gap of compound.The design void content that just is being based on top reason LSPM can be decided to be 13～18%, and it is greater than 0.01cm/s that the compound transmission coefficient requires.
5 opposing reflection crack abilities
Because the actual loading that acts on the road surface is the motion load, always the experience symmetry loads and asymmetric loading procedure, causes the singularity of the main cause crack tip shear stress that the crack in basic unit or the old pavement reflects to asphalt surface course under action of traffic loading.No matter be symmetrical loading or non-symmetrical load effect, the stress intensity factor of crack tip all will increase along with the increase that overlays basic unit's modulus.Bituminous mixture is a kind of temperature-sensitive material, its modulus is fairly obvious with variation of temperature, therefore the probability that winter occurs reflection crack is much larger than summer, and when temperature decrease speed and amplitude were all very big, the development of reflection crack was also very rapid in the overlay.LSPM is because void content is big, bitumen content is low, so its modulus is also lower, and is generally between 400～600MPa, low far beyond the close-graded bituminous mixture.
According to fracture mechanics analysis, do not have in the compound no matter hole or space hour are symmetrical loading or non-symmetrical load effect very, the crack tip stress state all has very big singularity, to subdue the stress of crack tip when having big space greatly concentrates, just explanation is in the fracture propagation process for this, and the existence in big space can hinder its further development.
According to above analysis, the LSPM modulus is lower, and void content is bigger, have big connectivity gap in the compound, so it has the ability of stronger opposing reflection crack.
Comprehensive above analysis to the LSPM performance, available feature performance benefit: (1) LSPM squeezes structure because coarse aggregate has formed complete skeleton embedding, has stronger opposing rutting deformation ability; (2) adopted the modified bitumen of viscosity higher, asphalt membrane thickness is bigger, has higher water stability; (3) void content is bigger, and infiltration coefficient can satisfy the structure drainage requirement, can will infiltrate beyond the rapid discharge structure of moisture on road surface; (4) because its modulus is not very high, and there is a large amount of connectivity gaps, has very high opposing reflection crack ability.
Laying method of the present invention is:
1) basic unit is carried out preliminary treatment;
2) with the simple grain of particle diameter 25mm-62mm footpath coarse aggregate and an amount of particle diameter be 0～4.75mm fine aggregate and bituminous cements composition compound by weight ratio be to mix and stir at 70: 27: 3, pitch adopts heat-conducting oil heating when mixing and stirring, heating-up temperature is between 170--180 ℃, coarse aggregate and fine aggregate heating-up temperature should be than the high 10--20 of asphalt temperature ℃, the appearance temperature of evenly mixing and stirring compound should be controlled at 170-185 ℃, plays the part of and time 45s at least;
3) paver carrying out slowly, even, continual once paving greater than the speed of 2m/min, and its thickness is 8-18cm;
4) compound is carried out compacting, form the LSPM layer;
5) lay at least one layer of bitumen layer on the LSPM layer, its thickness is not more than the LSPM layer thickness, finishes road surfacing.
Wherein, in the step 1), when basic unit is semi-rigid newly-built road surface,, should handle, guarantee that the cleaning and the planeness of basic unit meets the demands basic unit's end face for bonding and the dense water that guarantees basic unit and LSPM.
(2) simultaneously in order to guarantee that interlaminar bonding is good, should be at basic unit's spreading mulseal, concrete spreading amount is according to base layer structure form reference existing " asphalt highway construction technique normalizing " (JTJ F40-2004);
(3), destroys the moisture that guarantees LSPM infiltration following deck for oozing under not continuing, on priming oil, also can adopt individual layer pitch table place as seal and close water layer, specific practice is for using No. 90, bi tumenf orr oad or No. 70 heated bitumens as binding material, adopt special-purpose heated bitumen spreader to construct, asphalt content is 1.3-1.5kg/m
2, spreading 5-10mm rubble then.Spill the intact pneumatic-tired rollers that adopt later on of cloth at aggregate chips and roll, so that aggregate chips embeds among the pitch.
When basic unit was old asphalt pavement, the part of heavy damages such as the hole groove that should carry out the protobitumen road surface is occurred, loose, depression was mended processing by replacing a damaged part, the place of mending by replacing a damaged part employing dense-graded asphalt concrete backfill compacting.
When basic unit is old cement pavement, the heavy damage phenomenon that cement concrete pavement occurs also must be handled accordingly, the panel fragmentation seriously appears in the crack, edges of boards plate angle is broken and hole, hole phenomenon should be excavated, adopt cement concrete or dense-graded asphalt concrete to carry out backfill compacting then, should adopt mud jacking to handle for plat-bottom escape, purt mud and depression part.Also need to carry out the bearing capacity investigation after former road surface disrepair phenomenon repaired, the mensuration of bearing capacity of pavement structure can be divided into damaged class and no damaged class.Damaged class mainly drills through sample in each deck of road surface, its every calculating parameter is determined in test, by comparing with design standard, estimates its structural-load-carrying capacity.Not having damaged class measures by the damaged flexure mensuration of the nothing of road table, the structural-load-carrying capacity on estimation road surface.Can not adopt the test of FWD or the on-the-spot modulus of resilience that bearing capacity is estimated to there being damaged detection, (ET value＜120Mpa) handle is adopted in criterion, makes it reach the bearing capacity standard for the place of bearing capacity wretched insufficiency.Simultaneously, in order to be made an appraisal in old road more accurately, also should carry out a small amount of damaged detection, to compare analysis with no damaged testing result.
Because LSPM also has the effect of drainage blanket, the moisture among the LSPM circulates, and to destroy following deck in order oozing under the continuation that prevents moisture content it to be discharged more than old pavement, to former pavement patching and after finishing dealing with seal down need be set.Following seal construction should be cleaned clean in the past, and the concrete practice of following seal is the same.
Described step 2) in, overheated easily in drying when compound mixes and stirs because the fine grained composition is less in the LSPM material, can impel ageing of asphalt during mix, so reply mix temperature is carried out strictness control.When compound adopted the MAC-70# modified bitumen, pitch adopted heat-conducting oil heating, and heating-up temperature is between 170-180 ℃, and the heating-up temperature of gathering materials should be than the high 10--20 of asphalt temperature ℃.The appearance temperature of blending station compound should be controlled at 170-185 ℃, and discarded temperature is 195 ℃.Mixing time determined by trial mix, all particles all covered wrap up in asphalt binder, and with bituminous mixture uniform mixing degree of being.Segregation phenomenon that the compound that mixes and stirs is answered uniformity, do not had grey material, no conglomeration becomes piece or serious thickness is gathered materials can not be used when undesirable, and should in time adjust.The LSPM maximum particle diameter is bigger, coarse aggregate many and asphalt content is little, must prolong the mixing time for this reason, generally is at least 45s to improve the uniformity of compound according to testing the road making experience mixing time in the research process.
In the described step 3), when paving for fear of the serious segregation of the broken and compound of coarse aggregate, so should take once to pave, rationally adjust generally and must not accomplish slow, even, continual paving greater than 2m/min according to the ability of mixing and stirring of blending station.The compound coefficient of loose laying is between 1.18-1.20.
In the described step 4), the compacting of LSPM is the important step that guarantees base layer quality, should select rational road roller compound mode and roll step.Because LSPM is a kind of complete coarse aggregate cage construction, should guarantee during construction that the cage construction of coarse aggregate prevents to grind the destruction that causes the skeleton corner angle owing to crossing again.
According to test, temperature should be controlled between 165-175 ℃ during first pressing, and road roller should be closelyed follow paver, and must not take a sudden turn in compacting process, and vibratory roller should reduce the watering amount as far as possible, keeps rational compacting speed.For guaranteeing the wheel phenomenon not occur being stained with in the compacting process, should add a spot of washing powder class surfactant in the vibratory roller water tank.Pneumatic-tired rollers are not sprinkled water, and can spray or smear interleaving agent in right amount and be principle with sticking wheel in compacting process, wait until that promptly tyre temperature does not just need to continue to have sprayed during no longer sticking wheel after raising.
Vibratory roller can be followed the tracks of compacting after the mixture laying, and the compaction process that can adopt has two kinds, and concrete compaction process is as follows:
One, two tandem vibratory rollers, first pressing first pass static pressure that advances retreats vibration; Second time forward-reverse is the pressure of shaking.Compacting speed is preferably 1.5-2km/h, and for preventing from too to shake broken coarse aggregate, road roller should adopt high frequency to carry out compacting by a narrow margin, and the adjacent belt wheel mark that rolls overlaps to about 20cm.Watering device is interrupted watering, as long as guarantee not sticking wheel.After the vibration, pneumatic-tired rollers roll 1-2 time again, promptly can catch up with light subsequently.Catch up with light can adopt 7-11 ton steel roller, speed-controllable is built in 3-4km/h.
Two, pneumatic-tired rollers are followed the tracks of immediately following paver and are rolled, and seriously can spill low amounts of water at first for fear of sticking wheel, and tyre temperature then need not be sprinkled water after raising by the time.After pneumatic-tired rollers compacting one time, make the cage construction of compound become closely, stablized compound, after this again with vibratory roller with twice of technology one compacting after, use the rubber tire static pressure again one time, catch up with light at last.
Because compound is being cooled to cause the excessively crushing of gathering materials easily with vibration mode below the uniform temperature, therefore, should not roll with vibrations below the temperature at this again.In addition, because big macadam-aggregate mix void content is bigger, rough surface takes place loosely easily at the current soffit of loaded vehicle, and therefore the vehicle that should as far as possible avoid non-construction to pass through construction is finished after sails into, or in the time of lacking as far as possible the making asphalt surface course.
Claims (9)
1, a kind of large grain diameter water permeability asphalt mixture novel pavement structure, it comprises basic unit, it is characterized in that: be provided with LSPM layer and one deck bitumen layer at least in the described basic unit successively; Wherein the LSPM layer forms skeleton by the simple grain of particle diameter 25mm-62mm footpath coarse aggregate and mixes with bituminous cements with the filling fine aggregate of an amount of 0～4.75mm particle diameter and the framework type asphalt mixture formed, and each bitumen layer thickness is not more than the LSPM layer thickness.
2, large grain diameter water permeability asphalt mixture novel pavement structure according to claim 1 is characterized in that: described bitumen layer is the different three layers of pitch of upper, middle and lower of different layers of asphalt up and down of particle diameter or particle diameter.
3, large grain diameter water permeability asphalt mixture novel pavement structure according to claim 1 is characterized in that: described basic unit is old asphalt pavement or old cement concrete pavement or rubblization and presses cement concrete pavement or semi-rigid type base after steady.
4, large grain diameter water permeability asphalt mixture novel pavement structure according to claim 1 is characterized in that: described LSPM layer by weight, coarse aggregate: fine aggregate: asphaltum with high viscosity cementitious matter=70: 27: 3.
5, according to claim 1 or 4 described large grain diameter water permeability asphalt mixture novel pavement structures, it is characterized in that: described LSPM layer thickness is 8-18cm.
6, the laying method of the described large grain diameter water permeability asphalt mixture novel pavement structure of a kind of claim 1 is characterized in that:
1) basic unit is carried out preliminary treatment;
2) with the simple grain of particle diameter 25mm-62mm footpath coarse aggregate and an amount of particle diameter be 0～4.75mm fine aggregate and bituminous cements composition compound by weight ratio be to mix and stir at 70: 27: 3, pitch adopts heat-conducting oil heating when mixing and stirring, heating-up temperature is between 170--180 ℃, coarse aggregate and fine aggregate heating-up temperature should be than the high 10--20 of asphalt temperature ℃, the appearance temperature of evenly mixing and stirring compound should be controlled at 170-185 ℃, and the mixing time is 45s at least;
3) paver carrying out slowly, even, continual once paving greater than the speed of 2m/min, and its thickness is 8-18cm;
4) compound is carried out compacting, form the LSPM layer;
5) lay at least one layer of bitumen layer then on the LSPM layer, its thickness is not more than the LSPM layer thickness, finishes road surfacing.
7, the laying method of large grain diameter water permeability asphalt mixture novel pavement structure according to claim 6 is characterized in that: in the described step 1),
When basic unit is semi-rigid newly-built road surface, its preprocessing process is that road pavement cleans with smooth, the spreading mulseal, on priming oil, adopt individual layer pitch table place as seal and close water layer, specific practice is for using No. 90, bi tumenf orr oad or No. 70 heated bitumens as binding material, adopt the heated bitumen spreader to construct, asphalt content is 1.3-1.5kg/m
2, spreading 5-10mm rubble spills the intact pneumatic-tired rollers that adopt later on of cloth at aggregate chips and rolls, so that aggregate chips embeds among the pitch then;
When basic unit was old asphalt pavement, the part of heavy damages such as the hole groove that should carry out the protobitumen road surface is occurred, loose, depression was mended processing by replacing a damaged part, the place of mending by replacing a damaged part employing dense-graded asphalt concrete backfill compacting;
Basic unit is old cement concrete pavement or rubblization and when pressing cement concrete pavement after steady, when the panel fragmentation seriously being occurred, edges of boards plate angle is broken and cheats the hole, the crack should excavate, adopt cement concrete or dense-graded asphalt concrete to carry out backfill compacting then, should adopt mud jacking to handle for plat-bottom escape, purt mud and depression part, for needing rubblization to handle or pressing the steady cement concrete pavement of handling, carry out rubblization or press steady the processing;
Seal down is being set to former pavement patching and after finishing dealing with.
8, the laying method of large grain diameter water permeability asphalt mixture novel pavement structure according to claim 6 is characterized in that: in the described step 3), the coefficient of loose laying of compound is between 1.18-1.20 when spreading out and putting on.
9, the laying method of large grain diameter water permeability asphalt mixture novel pavement structure according to claim 6, it is characterized in that: in the described step 4), compaction process is, when adopting two tandem vibratory rollers, temperature should be controlled between the 165-175C during first pressing, the first pressing first pass static pressure that advances retreats vibration; Second time forward-reverse is the pressure of shaking, compacting speed is preferably 1.5-2km/h, road roller adopts high frequency to carry out compacting by a narrow margin, the adjacent belt wheel mark that rolls overlaps to about 20cm, and watering device is interrupted watering, after the vibration, pneumatic-tired rollers roll 1-2 time again, promptly can catch up with light subsequently, catch up with light can adopt 7-11 ton steel roller, speed-controllable is built in 3-4km/h.
Roll when adopting pneumatic-tired rollers to follow the tracks of immediately following paver, spill low amounts of water at first, tyre temperature then need not be sprinkled water after raising by the time; After pneumatic-tired rollers compacting one time, make the cage construction of compound become closely, repeat aforementioned compacting process with vibratory roller again and get final product.
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| CN103411803A (en) * | 2013-06-18 | 2013-11-27 | 天津市市政工程研究院 | Vibration molding method of drainage asphalt mixture |
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| CN103866668A (en) * | 2012-12-14 | 2014-06-18 | 北京中景橙石建筑科技有限公司 | Cement water-permeable concrete ground structure with water-permeable asphalt on surface and manufacturing method thereof |
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| CN103866668A (en) * | 2012-12-14 | 2014-06-18 | 北京中景橙石建筑科技有限公司 | Cement water-permeable concrete ground structure with water-permeable asphalt on surface and manufacturing method thereof |
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