CN104831598A - Construction method for reconstruction of old cement pavement into asphalt concrete pavement - Google Patents

Construction method for reconstruction of old cement pavement into asphalt concrete pavement Download PDF

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CN104831598A
CN104831598A CN201510192605.XA CN201510192605A CN104831598A CN 104831598 A CN104831598 A CN 104831598A CN 201510192605 A CN201510192605 A CN 201510192605A CN 104831598 A CN104831598 A CN 104831598A
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asphalt
pavement
plate
hole
rubber asphalt
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成军
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Abstract

The invention discloses a construction method for reconstruction of an old cement pavement into an asphalt concrete pavement, the steps are as follows: 1, pouring seams of the to-be-reconstructed old cement pavement, 2, judging the damage degree of the to-be-reconstructed old cement pavement, and processing damages; 3, spraying hot rubber asphalt on the damage-processed pavement, spreading an aggregate on the hot rubber asphalt, and rolling to embed the spread aggregate into an asphalt film to form a stress absorption and seepage prevention rubber asphalt stress absorbing layer; 4, paving a grating net sheet on the rubber asphalt stress absorbing layer, and fixing; and, paving an asphalt concrete surface layer on the grating net sheet, wherein the asphalt concrete surface layer is paved in two times. The maintenance cost is greatly reduced, the highway overhaul time is greatly extended, the pavement service life is prolonged more than 1 time, and good economic and social benefits are received. In the rubber asphalt production process, tire waste is used, energy is saved, and the construction method is conducive to environmental protection.

Description

Old cement concrete road transformation asphalt concrete pavement construction method
Technical field
The present invention relates to a kind of technical field of road construction, specifically a kind of rebuilding construction method of cement pavement.
Background technology
Since the nineties in last century, China's cement concrete pavement development is very rapid, and along with nowadays socioeconomic development, improving constantly of living standards of the people, the requirement of people to road driving comfortableness is more and more higher.Due to the growth of service life, the existence in cement pavement crack has had a strong impact on the comfortableness travelled.In order to better build city image, create good investment environment, many cities all start " changing black-labour journey in vain ".Cement pavement " blackened " namely on old cement concrete road Paving Bituminous Concrete surface layer form a kind of composite pavement.Composite pavement has flexible pavement ride comfort and the large two-fold advantage of rigid pavement supporting capacity concurrently, and this method has become the first-selected form of structure of rebuilding old road.But many " changing black-labour journey in vain " practices show, cement concrete pavement carries out Asphalt Concrete Overlay, often there is crack at cement concrete slab seam, crack place in skin coat, and these cracks have also become the Major Diseases after Cement Concrete Pavement Reconstruction Paving Bituminous Concrete.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and provides a kind of concrete pavement rebuilding construction method preventing pavement crack from producing.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of old cement concrete road transformation asphalt concrete pavement construction method, it is characterized in that, step is:
Step one, adopt rigid pavement caulking machine to be heated to 300 DEG C to the seam of old cement concrete road to be rebuilt, then by rigid pavement caulking machine adhesive pouring nozzle modified bitumen injected in seam and carry out the cementation of fissures;
Step 2, judge old cement concrete road to be rebuilt damaged degree and carry out Disease Processing according to degree of injury, damaged degree is divided into repairing type to damage and the damage of non-repairing type, wherein repairing type damage comprises general disconnected plate, serious crushing shell and the plate that comes to nothing, at the bottom of plate, pour into cement grout fill to the processing method of the plate that comes to nothing, being that fracture carries out fluting also injecting glue to the processing method of general disconnected plate, is change plate body to the processing method of serious crushing shell;
Step 3, at the hot rubber asphalt of the road surface spraying after Disease Processing, and spreading gathers materials and then rolls on hot rubber asphalt, makes gathering materials of spreading embed asphalt membrane and form the rubber asphalt stress absorbing layer that has stress absorption and antiseepage;
Step 4, on rubber asphalt stress absorbing layer, lay grid sheet and fixing;
Step 5, establish asphalt concrete pavement on grid mesh sheet upper berth, surface layer is laid at twice by aggregate size.
To the processing method specific practice of the plate that comes to nothing be:
(1) cloth hole: in blossom type, every plate 5 hole;
(2) hole: use 5cm bit bore, the degree of depth is 50 ~ 60cm;
(3) interim sealing of hole: the hole of having bored needs interim sealing of hole, in case foreign material enter;
(4) pre-buried flange nut: in order to madjack pipe rifle head can be fixed on mud jacking aperture, is formed overall, has enough pressure groutings, bury upper flange nut at aperture inwall;
(5) clear hole: use air High Pressure Gun, inserts in mud jacking hole, blowout foreign material;
(6) River Bank Stability: cement: water: water reducing agent: early strength admixture: expansion agent=1: 0.45 ~ 0.55: 0.02: 0.03: 0.02;
(7) mud jacking: mud jacking adopts stroke type pneumatic mortar machine, and pressure is 2 ~ 4Mpa; According to lifting plate difficulty or ease situation supercharging 1 ~ 2Mpa when lifting plate, make faulting of slab ends≤5mm after work;
(8) sealing of hole health: after mud jacking, should use stopper sealing of hole immediately, and health, could open to traffic after 3 days.
To the processing method specific practice of general disconnected plate be:
(1) first crack groover is cut out the work nest of the dark 1cm of wide 2cm;
(2) foreign material in work nest and dust are cleaned out;
(3) utilize crack filling apparatus, by adhesive pouring nozzle, glue of squeegeeing is injected formation in work nest and cohere crack, anti-sealing infiltrates basic unit.
The thickness of described rubber asphalt stress absorbing layer is 0.5 ~ 1.5cm; The bituminous concrete aggregate size that described surface layer first time lays is 20mm, and the thickness that first time lays is 4 ~ 6.5cm, and the bituminous concrete aggregate size that described surface layer second time is laid is 13mm, and the thickness that first time lays is 3 ~ 5cm.
Construction method of the present invention, after using Old cement concrete Disease Processing, overlay rubber asphalt stress absorbing layer and glass fiber grid crack-resistant layer, and the road surface that the layering of surface layer bituminous concrete is laid, comprehensively improve the opposing reflection crack of flexible pavement and the ability of warm plastic forming, particularly when using modified bitumen making upper layer, effect is particularly remarkable.Development East Road, Suzhou Industrial Park branch road engineering one bid section engineering, key road, north, the automobile south of a city, city of Kunshan engineering, the projects such as Kunshan Ba Cheng Weiyi Road engineering two bid section engineering were through the use of 1 ~ 4 year, reflection crack quantity is almost nil, warm plastic forming quantity greatly reduces, asphalt concrete fracture interval is generally about 20m, overlay rubber asphalt stress absorbing layer and glass fiber grid crack-resistant layer, and the pavement crack spacing that the layering of surface layer bituminous concrete is laid is about 80m, and without hole groove, without rut, without gathering around bag, without diseases such as bellding, maintenance costs reduces greatly, substantially prolongs the overhaul time of highway, service life of road surface extends more than 1 times, have received good economic benefit and social benefit.
Compared with prior art, the present invention has following characteristics:
1, by processing targetedly original old cement concrete road disease, ensure that the stability of sub-surface, decreasing road vehicles travels and temperature action produces basic unit transfinites deformation displacement, prevents the generation of newly repairing reflection cracking in a pavement.
2, rubber asphalt stress absorbing layer use, both the upwards transmission stress that old cement concrete road crack produces effectively had been absorbed, also solve the bonding problem of overlay and old cement concrete road simultaneously, and sub-surface antiseepage problem, effectively improve the construction quality of road.
3, the use of glass fiber grid Anti-crack layer, makes reflection stress equilibrium be distributed in larger areal extent, greatly alleviates the creep effects of bituminous texture layer, improves the ability of the long-term opposing tensile stress of bituminous texture layer, finally reaches the object preventing Asphalt Pavement Cracking.
4, a point aggregate size bilayer for asphalt concrete pavement is laid, and the stream that namely effectively prevent bituminous mixture becomes, and turn improves comfortableness and the durability on driving road surface, reduces road maintenance expense.
5, employ tire waste material in rubber asphalt manufacturing process, both saved the energy, be also conducive to environmental protection, the carbon black simultaneously in waste material rubber can make road surface black preserve for a long time, forms sharp contrast, improve the safety of road driving with graticule.
6, maintenance costs reduces greatly, and substantially prolongs the overhaul time of highway, service life of road surface extends more than 1 times, have received good economic benefit and social benefit.And employ tire waste material in rubber asphalt manufacturing process, both save the energy, be also conducive to environmental protection.
Detailed description of the invention
Show through domestic and international expert's research, bitumen concrete road surface cracks is mainly because basic unit's cement concrete level, vertically transfinite tensile stress that displacement produces exceed the tensile strength of Asphalt Concrete Overlay layer and the reflection crack that produces, and traffic loading and temperature action cause two of reflection crack large factors.For these crack Producing reason, and the successful experience in combining pavement construction in the past, rubber asphalt stress absorbing layer and glass fiber grid Anti-crack layer are combined by applicant in road construction, effectively prevent the generation of " changing black in vain " pavement crack.For instructing similar floor construction, standard construction technique, unified mass standard and improve safeguard measure, applicant, on the basis obtaining successful experience, has carried out summing up to construction technology and perfect, defines construction method of the present invention.
The pavement crack that prevents that old cement concrete road transformation asphalt concrete pavement cracking-proof construction method is applicable to Paving Bituminous Concrete surface layer engineering on old damaged cement pavement is constructed.
Old cement concrete road transformation asphalt concrete pavement cracking-proof construction method refers in the construction of old cement concrete road transformation asphalt concrete pavement, reflection crack is there is in order to prevent the road surface after constructing, first study and analysis is carried out to Old cement concrete plate before construction, be different types according to investigation result by Plate division, take different treatment measures to process damaged plate respectively for different types.After existing cement-concrete pavement Disease Processing, first rubber asphalt stress absorbing layer is laid, rubber asphalt stress absorbing layer is a kind of rubble confining bed, spray hot rubber asphalt in old concrete basic unit, then on hot rubber asphalt, spreading simple grain level is gathered materials, then carries out road roller to it and roll, and makes the embedding asphalt membrane that gathers materials of spreading, thus form a good stress absorption and impervious barrier, also solve the bonding problem of overlay and old cement concrete road simultaneously.After rubber asphalt stress absorbing layer has been constructed, lay glass fiber grid mesh sheet thereon, and be fixed mesh sheet, these glass fiber grid mesh sheet effectively can alleviate the tensile stress that transfinites that basic unit upwards transmits, and play certain cracking-proof effect.And then at glass fiber grid mesh sheet surface asphalt concrete pavement, surface layer is laid at twice by different aggregate size, ensures durability and the comfortableness of road surface running vehicle, namely " change " road surface so in vain black has constructed.The pitch transformation road surface using this engineering method to construct, stress equilibrium can be made to be distributed in larger areal extent, greatly to alleviate the creep effects of bituminous texture layer, improve the intensity of bituminous texture layer simultaneously, there is the ability of long-term opposing tensile stress, finally reach the object preventing Asphalt Pavement Cracking.
The flow process of construction technology of the present invention is: existing cement-concrete pavement reinforcement cleaning → rubber asphalt stress absorbing layer (AR-SAMI) 1cm → paving earth grille 230g/m2 → middle grain formula bituminous concrete (AC-20F) 6cm → particulate formula bituminous concrete (AC-13F) 4cm.
Reinforcement solutions is carried out to original Old cement concrete
The seam that cement concrete pavement is numerous is the main cause that Asphalt Concrete Overlay road surface produces reflection crack, handles this problem well most important, very crucial.Must carry out conscientiously processing thoroughly to original Old cement concrete disease before carrying out Paving Bituminous Concrete surface layer, only in this way improved road surface just can reach good Expected Results.
1, the cementation of fissures
The seam of original Old cement concrete all will adopt novel modified asphalt material to carry out the cementation of fissures, effectively to prevent road surface water from infiltrating basic unit from road surface, ensures that there are enough strength and stabilities in basic unit.This kind of modified bitumen must be heated to 300 DEG C by rigid pavement caulking machine in use, then by rigid pavement caulking machine adhesive pouring nozzle, modified bitumen is injected in seam.This kind of material at high temperature Heat stability is good, not easily agingly under low temperature becomes fragile, and safety economy, can not give environment again, can meet the needs of the seam cementation of fissures.
2, the repairing of serious crushing shell
To the serious crushing shell fragmenting into more than 3 pieces, conventional excavation-filling method is firmly adopted to change plate body.By old plate fragmentation, transport, cleaning basic unit; Repair bulk substrates (if any soft plain mud block, grooving of also should digging pit, until hard basic unit) with 15# poor concrete, substrate surface is smooth, and has certain horizontal wall inscription gradient, then again builds 30# concrete slab.Plate body change time should note following some:
(1) crushing mechanism suggestion is without jump bit, and because its impact force has vibration effect to peripheral plate basic unit, preferably use hand fit's air compressor machine, gadding machine also can;
(2) intensity of the concrete plate newly watered is not less than the design strength of original plate, and its material requirements, match ratio, construction technology quality specifications etc. should meet the regulation requirement of related design and job specfication;
(3) dowel bar reinforcement bar between runway and fast in longitudinal joint, should give and retain or recover; Reinforcing steel bar of pull rod in transverse joint (expansion joint (E.J.) or contracting seam) also should retain;
(4) change plate continuously and also should reserve longitudinal and transverse seam corresponding to old plate;
(5) need in concrete proportioning to add early strength admixture.
3, the repairing of general disconnected plate
The plate lighter to crack conditions, if the way of overhauling by the whole groove of crushing shell is done, not only cost is high, and time-consuming.Treat this type of disease, adopt the method for fracture grooving instilling glue to punish.Specific practice is:
(1) first crack groover is cut out the work nest of the dark 1cm of wide 2cm.
(2) foreign material in work nest and dust are cleaned out.
(3) utilize crack filling apparatus by adhesive pouring nozzle, glue of squeegeeing to be injected in work nest, thus reach the object of cohering crack anti-sealing infiltration basic unit, make it again to recover current function.
4, to come to nothing the repairing of plate
(1) to come to nothing the judgement of plate.Comprehensive following four kinds of methods judge to come to nothing plate:
(11) rain after the plate of purt mud be considered as the plate that comes to nothing without exception;
(12) measure the deflection value of plate completely, be one section with 2km, the fraction by 97.7% calculates the representative flexure of this section, and measured deflection is greater than the very possible cavity beneath slab of plate of the representative deflection value of this section.
(13) people stands in edges of boards seam crossing, when heavy vehicle crosses, can feel relative vertical displacement between two plates;
(14) when the capable mistake of loaded vehicle, people stands in edges of boards can hear empty sound.
(2) to come to nothing the process of plate.The good treating method of the plate that comes to nothing is exactly cement grout injected under slab.Under utilizing the pressure of mortar pump that cement grout is directly pressed into plate by pre-drilled hole, the cavity occurred under infill panel, makes basic unit again stablize.Construction method is as follows:
(21) cloth hole: in blossom type, every plate 5 hole.
(22) hole: plat-bottom escape mainly exists two interfaces: between concrete floor and substrate top surface and bottom basic unit and between subbase end face.Drilling depth must penetrate two grey basic units, to guarantee that slurries can be circulated into all possible interface of coming to nothing.Use 5cm bit bore, the degree of depth is generally 55cm, and arranging has special messenger to measure deeply, and record.
(23) interim sealing of hole: large area continuous productive process, various Construction traffic dealing is continuous, and the hole of having bored needs interim sealing of hole, in case foreign material enter.
(24) pre-buried flange nut: in order to madjack pipe rifle head can be fixed on mud jacking aperture, is formed overall, has enough pressure groutings, bury upper flange nut at aperture inwall.It should be noted, after pre-buried upper cap nut, need continue to seal up hole, in case foreign material fall into.
(25) clear hole: use air High Pressure Gun, inserts in mud jacking hole, blowout foreign material.
(26) River Bank Stability: cement: water: water reducing agent: early strength admixture: expansion agent=1: 0.45 ~ 0.55: 0.02: 0.03: 0.02.Slurries should possess features: the initial setting time is long, and construction workability is good, and early strength is high, does not shrink, and avoid again causing contraction.
(27) mud jacking: mud jacking adopts stroke type pneumatic mortar machine, and pressure is indicated by pressure meter.Mud jacking pressure should control according to mud jacking machinery, pavement behavior etc., is generally advisable with 2 ~ 4Mpa; According to lifting plate difficulty or ease situation supercharging 1 ~ 2Mpa when lifting plate, make faulting of slab ends≤5mm after work.Mud jacking key wants mud jacking rifle head and the mud jacking hole on plate can connect firmly, not spillage, ensures mud jacking pressure.
(28) sealing of hole health: after mud jacking, should use stopper sealing of hole immediately, after health 3d, and could open to traffic.Should note vehicle pass-through during mud jacking, the general hardened verge that retains is as construction passage.
5, other forms are damaged
Some other unstructuredness destroys, as surface peeling, undisguised, peel off, pitted skin etc., because it has influence on original road surface running vehicle comfortableness, and when reconstructing old road, existing cement-concrete pavement is when doing basic unit, the damage of these forms affects very little, so refuse specially treated on whole road structure bearing capacity and road-ability.
Rubber asphalt stress absorbing layer is constructed
1, the cleaning of basic unit, dust suction and cleaning should be carried out before construction.
First substrate surface is cleaned by artificial bamboo broom comprehensively, longitudinally line up oblique line with 2 ~ 3 forest extinguishing blast fans more floating ash is blown off, if the requirement of " Ex-all " can not be reached, then rinse with water, remove the floating ash of substrate surface and mud, make substrate top surface aggregate particle partly expose as far as possible.
2, the volume of rubber powder is determined
The different rubber powder volume (such as 18%, 20%, 22%) of general selection at least three is tested, and temperature range rubber powder being added pitch, between 177 ~ 204 DEG C, is tested after mixing and stirring 1 hour.
3, the production of rubber asphalt
Rubber asphalt production facility should be operated by skilled person, adopt batch process to produce.Operating personnel accurately control conduction oil temperature, accurately control proportion scale.In time every inspection is carried out to finished product rubber asphalt.
4, before spread rubber asphalt, should note checking
(1) air themperature and surface temperature all must not lower than 15 DEG C.
(2) sub-layer must be dry, and road kerb protection is good.
(3) wind speed does not affect rubber asphalt spread effect.
(4) need equipment enter armed state, comprise rubber asphalt spreading vehicle, road-metal spreading machine, pneumatic-tired rollers.
5, rubber asphalt spread
(1) rubber asphalt spread quantity adopts 1.5 ~ 2.0kg/ ㎡, adopts when wrapping up in attached gathering materials in advance.
(2) starting and final position should spread engineering paper, and accurately to carry out horizontal linking, distribution vehicle is through taking engineering paper in time away later.
(3) be longitudinally connected and should partly overlap about 10cm with spread.
(4) forbid that any vehicle, pedestrian are by rubber asphalt layer before spreading paving rubble.
6, paving rubble is spread
Should spread paving rubble immediately after spraying rubber asphalt, it is 12 ~ 18kg/ ㎡ that rubble spreads paving amount, determines that Yi Manpu, not degree of being lost to spread the place of paving quantity not sufficient, with manually supplying for local rubble according to examination paving situation.
7, roll
The pneumatic-tired rollers of more than 25T are adopted to carry out compacting.Should carry out rolling operation immediately after rubble spreads paving, two pneumatic-tired rollers should roll simultaneously, spread paving car immediately following rubble, and rolling number is 3 times.
8, before the bituminous mixture of making upper strata, reply rubber asphalt stress absorbing layer cleans, and to remove the loose rubble of not bonding, avoids the bonding affecting stress absorbing layer and upper layer.
9, the construction of rubber asphalt stress absorbing layer should be carried out with upper layer bituminous concrete is compact, and centre is open to traffic not, if period must open to traffic, must can open to traffic after stress absorbing layer has been constructed 3 hours, but the speed of a motor vehicle is no more than 25km/h.
The problem that should be noted that in 10 constructions
(1) rubber powder is without caking phenomenon, ensure that rubber powder calcium carbonate content is about 4%.
(2) substrate will be cleaned, and occurs to prevent rubber asphalt layer skin effect phenomenon.
(3) in order to eliminate the impact of dust on SAMI performance, by WATER-WASHING METHOD dedusting, attached method can also be wrapped up in advance by pitch.This engineering adopts 1% ~ 2% pitch to wrap up in attached way in advance, increases the bonding of rubber asphalt and rubble.
(4) will prevent sticky wheel in construction rolling process, in the place that crushed stone spreading is less, rubber asphalt surface completely by gravel mulch, can not cause SAMI material to be taken up, rubber tire adheres to a large amount of asphalt macadam like this.Occur that this phenomenon must remove damaged portion spreading again, to ensure its globality.
(5) prevent SAMI from construction, segregation phenomenon occurring, it is excessive that oil mass is spilt in local, and pitch floats and easily glues wheel.Crushed stone spreading amount is on the low side, and pitch exposes, and thickness is not enough, and affect the whole structure that it prevents reflection crack, two kinds of situations all can road pavement have a negative impact.
The construction of glass fiber grid crack-resistant layer
1, Material selec-tion
The Glass Fibre Earth Grid be laid in asphalt concrete layer must use and be coated with the Glass Fibre Earth Grid that gum has self-adhering property.Glass Fibre Earth Grid floods by glass bundle weave and through asphalt binder and forms, and the tensile strength of fiber is not less than 100kN/m, and elongation per unit length when breaking is not more than 3%, and the fusing point of fiber is not less than 1000 DEG C, the high temperature that ability is more than 180 DEG C.The mesh size of Glass Fibre Earth Grid is preferably 12.5mm × 12.5mm to 25mm × 25mm, is usually not less than the maximum particle diameter of the asphalt pavement material of making on it, and mesh form is square.Hide under the condition that grid should be dustless in cleaning, dry and preserve.The mass area ratio of glass fiber grid should be less than 300g/m, and the thickness of Glass Fibre Earth Grid is blocked up easily causes levels in conjunction with bad and occur peeling.Grid should have good adhesion stress with bituminous mixture, can bear Construction traffic and paver etc. run and indeformable.
2, construction point
(1) sub-layer removing surface
Sub-layer removing surface adopts hand sweeping in conjunction with pressure-air machine purge.
(2) artificial making glass fiber grid layer
Adopt the glass fiber grid of band self-adhesion gum to adopt artificial spreading method, laying should be kept smooth-going, and tension, must not be wrinkling, makes grid possess effective tension force.Glass fiber grid transverse lap length is preferably 50-100mm, and longitudinal lap joint length is preferably 150-200mm, and according to spreading direction, is pressed under front one end rear one end.
(3) glass fiber grid layer is fixed
Adopt steel nail and little steel disc stationary grizzly, follow closely a fixed point every 10-15 rice, fixing steel nail used should not be placed on geo-grid skeleton, otherwise should retighten.
(4) the light machine compacting of road roller
Roll 1-2 time with clean steel roller again after having spread, ensure that grid and sub-layer are fitted closely.
(5) spreading sticking layer oil and aggregate chips
Road oiler is first adopted to spray mulseal sticking layer oil, then spreading screening seal coat.Sticking layer oil consumption is no less than 0.4 ~ 0.6kg/ ㎡, and sealing spread aggregate chips consumption is no less than 1.0 ~ 1.5kg/ ㎡.
(6) surface course bituminous mixture laying
At once the operation of surface course bituminous mixture laying is carried out in or 24 hours after grid layer completes.
3, the problem that should be noted in construction
(1) the strict vehicle controlling to transport compound is come in and gone out, and grid layer is forbidden vehicle is brought to a halt, rotary head, come down in torrents compound, to prevent the damage to glass fiber grid.
(2) glass fiber grid is glass fiber manufacture, easily produces spread effect to human body skin, and constructor must wear protective gloves.
(3) glass fiber grid gum is soluble in water, must not construct when rainwater or wet road surface.
Asphalt concrete pavement construction
Asphalt concrete pavement adopts double-deck setting, and lower floor adopts the thick middle grain formula bituminous concrete (AC-20F) of 6cm, and upper strata adopts 4cm thick particulate formula bituminous concrete (AC-13F).The bituminous concrete that particle diameter is thicker has good skeleton, and can effectively prevent bituminous mixture stream from becoming, the bituminous concrete that particle diameter is thinner can improve comfortableness and the durability of road surface running vehicle.
1, the mixing and stirring and transporting of bituminous mixture
(1) bituminous mixture to mix and stir in process will from mixture gradation, asphalt content, mix and stir temperature and time etc. and carry out omnibearing control, to improve the paving effect of compound.
(2) bituminous mixture is in transportation, it fully must be covered, to prevent pitch reduction by sunlight, oxidation that air causes and bituminous mixture temperature when high temperature.
2, the paving of bituminous mixture
(1) control of planeness
In order to control planeness when paving, the automatic leveling device of paver screed needs a datum accurately.The method that datum (line) conventional in current expressway works controls has: benchmark wire rope method, floating datum beam method etc.
(2) paving material controls
Temperature when paving must not lower than 110 ~ 130 DEG C, also must not higher than 165 DEG C.In practice of construction process, can differentiate by ocular estimate: overheated compound is from emitting blue or green cigarette on the surface, and color and luster is uneven; Cross cold mix surface coarse, and have caking phenomenon, aggregate surface wraps bad.
(3) spreading speed controls
Should remain a constant speed during paver work and slowly advance, must not time slow time fast or stop over; Otherwise screed stress balance system can be destroyed, cause screed to fluctuate up and down, directly affect surface evenness.
3, the rolling of pitch blended stock
(1) compacting equipment must be furnished with steel roller, large-tonnage rubber-tyred roller and small-size vibratory roller or hand steered vibration rammer, can carry out combination compacting by rational compaction process.
(2) compound complete pave and strike off after should road pavement check immediately, should in time with manually adjusting to irregular part, to carry out subsequently fully, uniform compacting.
(3) compacting is divided into first pressing, multiple pressure and final pressure, and road roller should travel with even speed.
(4) first pressing adopts lightweight section cartridge type road roller or closes the vibratory roller vibrated and rolls, and checks planeness and road camber, should give finishing if desired after first pressing.Carry out after multiple compression is connected on first pressing, multiple pressure should adopt heavy rubber-tyred roller, also can adopt vibratory roller.Final pressure is carried out immediately preceding after multiple pressure, and final pressure should adopt twin wheel steel cartridge type road roller or close the vibratory roller vibrated and roll.
(5) result of the test that the work of rolling should be determined by Experiment Road is handled.
(6) rolling period, road roller must not stop over, turns to or brake.When road roller alternately rolls back and forth, front and back stop place for twice and at a distance of more than 10m, and should should roll away from beyond compacting start line 3m.
(7) road roller must not rest on the compound of temperature higher than the compacting of 50 DEG C.Should adopt an effective measure simultaneously, prevent other organic impurities such as oil plant, lubrication oil, gasoline in road roller operation or drop on road surface during parking.
(8) when compacting, mixture temperature as seam crossing (comprising longitudinal joint, transverse joint or other reasons and the constuction joint formed) can not meet compacting temperature requirement, the temperature that heater should be adopted to improve compound meets the requirements of compacting temperature, then till being compacted to seamless mark.Otherwise, must perpendicular cuts compound making again, till jointly rolling seamless mark immediately.
(9) road roller pressing less than place, should adopt heat hand rammer or machine ram abundant for compound compacting.Complete the road surface of rolling, must not epidermis have been repaired.
4, the process of seam
(1) arrangement of making work should make longitudinal and transverse seam all remain on minimum number.The method and apparatus of seam, should obtain supervising engineer's approval.Should be identical with other parts with surface finish in the density of seam crossing.
(2) transverse joint of adjacent two width and levels, all should misplace more than 1m, and transverse joint is forbidden to adopt mitre, should adopt vertical flat seam.
(3) flat seam should accomplish tight bond, and abundant compacting connects smooth-going, joint cutter can be adopted to trim joint, then pave after spilling sticking layer oil.
(4) transverse joint first should be carried out transverse direction with road roller and rolled, and when rolling, road roller should be positioned on the surface layer of compacting, misses new laying 15cm, and then often pressure moves 15 ~ 20cm to new laying one time, until all in new laying, then changes longitudinal rolling into.
(5) when avoiding occurring longitudinal cold joint, should add baffled or add cutting knife and trim, also can dig with a pick before compound cools not yet completely except edge leaves the mode of hair stubble, but rear employing cutting machine joint-cutting should not be cooled make longitudinal cold joint.
(6) longitudinal joint of levels should stagger 150mm (hot seam) or 300 ~ 400mm (cold joint), and the longitudinal joint on top layer should be straight, and cold joint should be stayed on traffic lane line position.
The required main material of construction
Rubber powder
Rubber powder particle size should meet following table requirement.Rubber powder screening should adopt water sieve method to test.Rubber powder density should be 1.15 ± 0.05g/cm 3, should without iron wire or other impurity, proportion of fibers should be no more than 0.5%.
Supplier should provide rubber powder quality certificate, and rubber powder specification, processing mode, the junked tire type of processing, the storing mode etc. of rubber powder are described.
Rubber powder screening specification table 1
Screen size Percent of pass %
2.00mm 100
1.18mm 65~100
600μm 20~100
300μm 0~45
75μm 0~5
Rubber asphalt
Rubber modified asphalt should meet following technical requirements, and its sampling observation project meets the requirement of following table.
Rubber modified asphalt technical requirements table 2
Test item Technical indicator
Rotary viscosity 177 DEG C of Pa.s 1.5~4.0
Softening point, DEG C, minimum 54
Needle penetration (25 DEG C, 100g, 5s) 0.1mm, minimum 25
Elasticity is recovered, 25 DEG C, minimum 60
Gather materials
Stress absorbing layer should adopt the broken ovum rubble that stone matter is hard, clean, do not contain weathering particle, nearly cubic granules, and should select the rubble of impact breaker rolling, specification is 9.5mm ~ 13.2mm.
Rubber asphalt stress absorbing layer aggregate grading scope is as following table.
Stress absorbing layer gathers materials specification table 3
Rectangular mesh size (mm) Grading limit
13.2 100
9.5 0~15
2.36 0~5
0.075 0~0.5
Glass fiber grid
Glass fiber grid adopts autohesion earth grille, and glass fiber grid quality should meet the requirements.
Glass fiber grid technical performance table 4
Quality control
Installation, the debugging of 7.1 modular composite plate low-temperature hot water floor radiation heating systems should strictly observe following related standards: " building water supply and drainage and heating engineering construction quality accident specification " (GB50242-2002), " building floor engineering construction quality standards of acceptance " (GB50209-2010).
The quality index of 7.2 module boards should reach following requirement:
7.2.1 the quality control of rubber asphalt stress absorbing layer
1, the test item of construction stage comprises: rubber asphalt character, rubber asphalt spread quantity, spread quantity of gathering materials, wheels-locked testing, visual inspection etc.
2, the method for inspection and test stone see the following form
The Quality Inspection Criteria table 5 of flexible pavement stress absorbing layer construction stage
3, rubber asphalt spread quantity and rubble spill the control of paving amount
(1) pitch sprinkling amount controls
Will distributing asphalt time, at the built-in asphalt felt of standard size rectangular vessel, claim its weight and 5 ~ 10m before being placed in distribution vehicle, take out immediately after container until distribution vehicle and claim it heavy again, calculate actual spreading amount with this, then bound bitumen distribution vehicle computer adjusting device is until design spread quantity.
(2) crushed stone spreading amount controls
Will spread rubble time, get a standard size rectangular vessel and claim its weight and the tail place, section on distributing asphalt road surface before being placed in truck spreader, taking out immediately after container until distribution vehicle claims it heavy again, calculates actual spread quantity with this, then by adjusting device until be transferred to design spread quantity till.
(3) glass fiber grid quality control on construction
Glass fiber grid paves and constructs will launch with the sprinkling of sticking layer oil simultaneously, faces up, suitably tension (elongation rate 1 ~ 1.5%) by coarse one, and held stationary.Grid transverse lap length >=10cm, longitudinal lap joint length >=15cm, overlaps overlapping direction consistent with the direction that asphalt concrete paver travels.Transverse lap place should adopt fixator (cement nail, swell fixture etc.) to fix.Each section of grid need roll stable by light-duty rubber roll road roller appropriateness, grid and former road surface are bondd firmly after laying.

Claims (4)

1. an old cement concrete road transformation asphalt concrete pavement construction method, it is characterized in that, step is:
Step one, adopt rigid pavement caulking machine to be heated to 300 DEG C to the seam of old cement concrete road to be rebuilt, then by rigid pavement caulking machine adhesive pouring nozzle modified bitumen injected in seam and carry out the cementation of fissures;
Step 2, judge old cement concrete road to be rebuilt damaged degree and carry out Disease Processing according to degree of injury, damaged degree is divided into repairing type to damage and the damage of non-repairing type, wherein repairing type damage comprises general disconnected plate, serious crushing shell and the plate that comes to nothing, at the bottom of plate, pour into cement grout fill to the processing method of the plate that comes to nothing, being that fracture carries out fluting also injecting glue to the processing method of general disconnected plate, is change plate body to the processing method of serious crushing shell;
Step 3, at the hot rubber asphalt of the road surface spraying after Disease Processing, and spreading gathers materials and then rolls on hot rubber asphalt, makes gathering materials of spreading embed asphalt membrane and form the rubber asphalt stress absorbing layer that has stress absorption and antiseepage;
Step 4, on rubber asphalt stress absorbing layer, lay grid sheet and fixing;
Step 5, establish asphalt concrete pavement on grid mesh sheet upper berth, surface layer is laid at twice by aggregate size.
2. construction method according to claim 1, is characterized in that, to the processing method specific practice of the plate that comes to nothing is:
(1) cloth hole: in blossom type, every plate 5 hole;
(2) hole: use 5cm bit bore, the degree of depth is 50 ~ 60cm;
(3) interim sealing of hole: the hole of having bored needs interim sealing of hole, in case foreign material enter;
(4) pre-buried flange nut: in order to madjack pipe rifle head can be fixed on mud jacking aperture, is formed overall, has enough pressure groutings, bury upper flange nut at aperture inwall;
(5) clear hole: use air High Pressure Gun, inserts in mud jacking hole, blowout foreign material;
(6) River Bank Stability: cement: water: water reducing agent: early strength admixture: expansion agent=1: 0.45 ~ 0.55: 0.02: 0.03: 0.02;
(7) mud jacking: mud jacking adopts stroke type pneumatic mortar machine, and pressure is 2 ~ 4Mpa; According to lifting plate difficulty or ease situation supercharging 1 ~ 2Mpa when lifting plate, make faulting of slab ends≤5mm after work;
(8) sealing of hole health: after mud jacking, should use stopper sealing of hole immediately, and health, could open to traffic after 3 days.
3. construction method according to claim 1, is characterized in that, to the processing method specific practice of general disconnected plate is:
(1) first crack groover is cut out the work nest of the dark 1cm of wide 2cm;
(2) foreign material in work nest and dust are cleaned out;
(3) utilize crack filling apparatus, by adhesive pouring nozzle, glue of squeegeeing is injected formation in work nest and cohere crack, anti-sealing infiltrates basic unit.
4. the construction method according to claim 1,2 or 3, is characterized in that, the thickness of described rubber asphalt stress absorbing layer is 0.5 ~ 1.5cm; The bituminous concrete aggregate size that described surface layer first time lays is 20mm, and the thickness that first time lays is 4 ~ 6.5cm, and the bituminous concrete aggregate size that described surface layer second time is laid is 13mm, and the thickness that first time lays is 3 ~ 5cm.
CN201510192605.XA 2015-04-21 2015-04-21 Construction method for reconstruction of old cement pavement into asphalt concrete pavement Pending CN104831598A (en)

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Cited By (12)

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CN106245508A (en) * 2016-08-04 2016-12-21 陈毅忠 A kind of free removal structural destruction bituminous paving restorative procedure
CN107938460A (en) * 2017-11-27 2018-04-20 中汽中心盐城汽车试验场有限公司 A kind of automobile test low attached bituminous paving and its laying method
CN110144787A (en) * 2019-05-15 2019-08-20 江苏阜光工程新技术有限公司 A kind of super construction technology for gluing ultra-thin stress absorbing layer
CN110374017A (en) * 2019-06-11 2019-10-25 广州市市政工程设计研究总院有限公司 A kind of blackened remodeling method of cement bridge floor
CN111663415A (en) * 2020-07-24 2020-09-15 德州市大成工程有限公司 Asphalt pavement paving method
CN112281572A (en) * 2020-09-29 2021-01-29 河北建设集团股份有限公司 Construction method of stress absorbing layer asphalt pavement
CN112883699A (en) * 2019-11-29 2021-06-01 核工业二一六大队 Uranium mine geological drilling and sealing design and sealing registration table digital manufacturing method
CN113235350A (en) * 2021-05-20 2021-08-10 福建新华夏建工集团有限公司 Method for realizing concrete road reconstruction by additionally paving asphalt concrete surface layer
CN113789691A (en) * 2021-08-20 2021-12-14 山东高速基础设施建设有限公司 Stress-compensated high-toughness asphalt pavement and construction method
CN113882284A (en) * 2021-11-05 2022-01-04 西安市灞桥市政设施养护管理有限公司 High-toughness mute thin layer cover maintenance construction method for urban road and bridge
CN115506195A (en) * 2022-09-29 2022-12-23 黑龙江达融建筑工程技术咨询有限公司 Rigid-elastic composite board, preparation method thereof and method for preventing and treating reflection cracks
CN116219849A (en) * 2023-03-06 2023-06-06 厦门中平公路勘察设计院有限公司 Road surface reflection crack repairing technology

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106245508A (en) * 2016-08-04 2016-12-21 陈毅忠 A kind of free removal structural destruction bituminous paving restorative procedure
CN107938460A (en) * 2017-11-27 2018-04-20 中汽中心盐城汽车试验场有限公司 A kind of automobile test low attached bituminous paving and its laying method
CN110144787A (en) * 2019-05-15 2019-08-20 江苏阜光工程新技术有限公司 A kind of super construction technology for gluing ultra-thin stress absorbing layer
CN110374017A (en) * 2019-06-11 2019-10-25 广州市市政工程设计研究总院有限公司 A kind of blackened remodeling method of cement bridge floor
CN112883699A (en) * 2019-11-29 2021-06-01 核工业二一六大队 Uranium mine geological drilling and sealing design and sealing registration table digital manufacturing method
CN111663415A (en) * 2020-07-24 2020-09-15 德州市大成工程有限公司 Asphalt pavement paving method
CN112281572A (en) * 2020-09-29 2021-01-29 河北建设集团股份有限公司 Construction method of stress absorbing layer asphalt pavement
CN113235350A (en) * 2021-05-20 2021-08-10 福建新华夏建工集团有限公司 Method for realizing concrete road reconstruction by additionally paving asphalt concrete surface layer
CN113789691A (en) * 2021-08-20 2021-12-14 山东高速基础设施建设有限公司 Stress-compensated high-toughness asphalt pavement and construction method
CN113789691B (en) * 2021-08-20 2024-04-12 山东高速基础设施建设有限公司 Stress compensation high-toughness asphalt pavement and construction method
CN113882284A (en) * 2021-11-05 2022-01-04 西安市灞桥市政设施养护管理有限公司 High-toughness mute thin layer cover maintenance construction method for urban road and bridge
CN115506195A (en) * 2022-09-29 2022-12-23 黑龙江达融建筑工程技术咨询有限公司 Rigid-elastic composite board, preparation method thereof and method for preventing and treating reflection cracks
CN116219849A (en) * 2023-03-06 2023-06-06 厦门中平公路勘察设计院有限公司 Road surface reflection crack repairing technology

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Application publication date: 20150812