CN102330401B - Joint-expansion-free refilling process for cement concrete road slab joint - Google Patents
Joint-expansion-free refilling process for cement concrete road slab joint Download PDFInfo
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- CN102330401B CN102330401B CN 201010229589 CN201010229589A CN102330401B CN 102330401 B CN102330401 B CN 102330401B CN 201010229589 CN201010229589 CN 201010229589 CN 201010229589 A CN201010229589 A CN 201010229589A CN 102330401 B CN102330401 B CN 102330401B
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Abstract
The invention relates to a cement concrete road slab joint joint-expansion-free refilling process, which concretely consists of five steps of joint cleaning, polishing, flushing, blowing off and material filling. When the joint-expansion-free refilling process disclosed by the invention is used, joints can not be broadened, and in addition, only one half (8 to 12mm) of the total thickness from the surface to the lower part of old filling materials needs to be removed. The joint-expansion-free refilling process has the maximum advantages that during the refilling in each time, the joints can not be artificially broadened, and simultaneously, one half of the old filling materials in the joints can also be cyclically used. Therefore, the service lives of road slabs can be effectively prolonged, the management and maintenance cost of roads can also be reduced, the resources are saved, and the environment pollution is reduced.
Description
Technical field
The present invention relates to a kind of cement concrete road slab joint does not expand seam and fills with again technique.
Background technology
Present situation from present China, the panel of every newly-built cement concrete road or other large-scale cement concrete plate, damage for preventing that panel (or plate) from expanding with heat and contract with cold, after cement sheeting builds up, all will be in setting time, according to the structure of plate and the requirement of application function, various seams (it is wide to go out certain seam with the saw kerf machine saw) are set.The cement concrete road slab joint should comprise: transverse joint (also claiming the contracting seam), longitudinal joint, constuction joint (transverse joint that arranges when being interrupted for construction is set up in expansion joint (E.J.) or contracting seam place), four kinds of expansion joint (E.J.)s (seeing Fig. 1).Thereby the cement concrete plate that will become whole shape is divided into regular fritter, leaves certain gap between the fritter.The clearance gap of general transverse joint, longitudinal joint and constuction joint is wide to be 4～5mm, and expansion joint (E.J.) is 20～25mm (seeing Fig. 2), so that plate has enough latitudes under temperature Change, and unlikely being extruded (or stretch) causes the plate face to squeeze broken, arch bar (plate face be extruded and arch upward) or cracking (plate owing to push make stress raisers cause random crack).
After setting of joint is good, from seam, infiltrate roadbed for preventing rainwater, roadbed is damaged; For preventing that the hard things such as sandstone from embedding in the seam, causes the inefficacy of seam Telescopic.According to the relevant Maintenance specification of country, should in the gap of seam, insert corresponding filler.Requirement to the packing technique performance is: 1. require filler to bond firmly with the seam wall, in use do not ftracture, do not come off, can prevent effectively that the moisture such as rain, snow from infiltrating roadbed by seam; 2. require filler that preferably elasticity is arranged, embed to prevent sandstone, make seam regulate flexible disabler; 3. require filler that preferably ductility (deformability) is arranged, can adapt to joint gap when temperature Change the variation of corresponding generation, and do not broken or thrown off with slotted wall; 4. require filler that preferably durability is arranged, can keep long application life.Filler commonly used has ecosystem pitch class, modified bitumen class, polyurethanes, modified polyurethane, silicone based, polysulfide rubber class on the market now.In fact, no matter be low-grade ecosystem pitch class material or high-grade high molecular polymer class material, the process regular hour all can because disabler needs to change, that is to say and want butt joint regularly to carry out maintenance.According to the regulation of national relevant specification, joint filler generally is should change once in 2～3 years.
According to the existing maintenance pattern of highway administration departments at different levels,, the seam of newly-built cement concrete road panel, after for the first time joint filling, when changing filler later at every turn, all to carry out following two necessary steps: 1. the former old filler that is filled in the seam must be removed all, neatly, in order to fill new filler; 2. the old filler on seam two walls must be removed totally, so that new filler can be firm with the slotted wall bonding.In order to achieve the above object, general way is with raked joint machinery, and slotted wall is cut and polishes, and so, will make seam widen 2～3mm.But in the operating process of reality, because the extensive property of mechanical execution, not only the seam degree of widening can the 2～3mm of surpassing far away, and the shape of the seam width that also can become differs.The inventor once observed many cement concrete roads, and behind the process cementation of fissures second time, the width of seam is general just have been reached more than the 10mm.Certainly, theoretically, cement concrete pavement belongs to typical rigid pavement.And As time goes on the effect of creeping of rigid pavement, also can make seam broaden gradually, but the inventor thinks: artificial expansion seam should be the main cause that current cement concrete road slab joint at different levels broadens.
After seam is widened, can bring many-sided problem, it shows following three aspects highlightedly:
(1) after seam broadened, the high-incidence season of slab disease can occur in advance with respect to designing requirement, and highway is normal effectively can be shortened dramatically application life;
(2) after seam broadened, it was serious to jump the car sense during driving, and the comfortableness of driving can variation;
(3) after seam broadens, exist serious traffic safety potential problem (especially on speedway and airfield runway).
At first come call for Votes (1): after seam broadened, rainwater significantly increased from the chance that seam crossing infiltrates.Water is the formidable enemy of cement concrete road, infiltrates roadbed from seam crossing, and roadbed is immersed in water, and soil group moisture content is strengthened, depression of bearing force, and subgrade strength will significantly reduce.Gently then cause road surface grout, purt mud, heavy then cause the road surface plate crack, faulting of slab ends, depression to occur or plate fracture isostructuralism is damaged.
After seam broadened, the seam edge was difficult to withstand the destruction of the prolonged and repeated impact of wheel, caused easily diseases such as gnawing limit and corner fracture.
After seam broadens, if maintenance is untimely, in time do not change after filler loses efficacy, seam is easier of the hard thing plug embedding such as silt particle or rubble.When the plate temperature rise, can cause stress raisers, cause plate to arch upward or squeeze broken.
The data of investigating for many years according to the inventor show that the cement concrete road disease high-incidence season has increased difficulty and workload not only for the management and maintain work of road in advance, and cement concrete road is normally effectively shortened more than 10 years application life.The not long cement concrete road of many local building times is arranged, and when disease seriously can not normally be used, just adding black top in the above became bituminous highway, though a kind of good method of disposal of can yet be regarded as also belongs to the act of having no way out.
It is reported, build the expense at least several hundred million of the cement concrete road of a upper grade, at most tens, projected life all can be more than 30 years.If because the pipe work of supporting is limited to the force of habit, be subjected to the constraint of maintenance idea and understanding mistaken ideas, make the normal Acceptable life of highway shorten 1/3rd, not only can cause economically greatly waste, also can cause socially greatly negative effect.
Call for Votes (2) again: technical level and the appointed condition of building cement concrete road from China, owing to be subjected to the restriction of economic condition, can have the import such as the paver specialty road building equipment except building high-grade highway, comprise the build of the ordinary road of national highway, provincial highway, it is simple and mechanical mostly can only to use three axle machines etc., many local or Manuals are main.
Because the restriction of technical level and appointed condition, in general, the planeness of newly-built cement concrete road panel is difficult to up to standard, and obvious jumping car sensation is arranged during driving, and the comfortableness of driving is poor.If by old management and maintain pattern, after seam is filled with once or twice again, on average stitch wide meeting and reached more than the 10mm by 4 original～5mm again.After seam broadened, it was more serious to jump the car sense during driving, and it is poorer that the comfortableness of driving can become.
Call for Votes (3) again: along with old seam is filled with back and forth carrying out of pattern again, road face seam can be more and more wider.It is also more and more serious to gnaw the diseases such as limit, corner are damaged, faulting of slab ends, crack.If maintenance is untimely or not up to standard, the traffic of road face just not only has the problem of road-ability, also exists the security hidden trouble of driving.On speedway and airfield runway, after speed per hour surpassed certain limit, safety had just become a very serious problem especially.
Is in sum, the harm that existing seam maintenance method causes to the cement concrete road obvious to all, but why existing seam maintenance method still will follow in highway administration at different levels department? the inventor analyzes the reason that two aspects are arranged:
Reason one: butt joint is filled out and is filled with engineering and exist mistaken ideas on the understanding.
Fill out when filling with again to the first time after filling with in seam, some phenomenon in following three kinds of situations may appear in the filler in the seam: 1. filler and slotted wall unsticking, water shutoff disabler; 2. filler is taken away by wheel, the filler disappearance occurs, and the disappearance part is made seam regulate flexible miopragia by sandstone, earth pointing; 3. the filler top layer occur darkening, the aging phenomena such as elasticity weakens, strength decreased.
In this case, people generally believe all aged deteriorations of filler in the seam, must all clear out old material when filling with again, all fill out the filling virgin material again, the multiple filling quality of guarantee seam.The inventor thinks that this is the use function of butt joint, and the physics of filler, chemical change process in the butt joint, butt joint are filled out on the understanding such as activities of filling and existed mistaken ideas.
Because exist difference on the understanding, administrative departments at different levels still are limited to the custom thinking so far, adhere to carrying out maintenance by the existing pattern butt joint of filling with again, along with multiple filling process back and forth, year after year, it is more and more wider that seam just becomes.
Reason two: butt joint is filled out the filling engineering, sticks to the established practice, and lacks creativity consciousness.
For a long time, the administrative department of highways at different levels, butt joint is filled out and is filled with engineering and stick to the established practice, adhere to only go up, only book, by the principle of standard by the system working.Butt joint is filled out theory, material, the technique of filling with engineering and is lacked creativity consciousness, makes the level of understanding and the practical level of China's cement concrete road maintenance work, and stagnation, shortage innovation can not be accomplished to grow with each passing hour.
For first reason: after the inventor thought that filler pours into seam, it was many-sided causing its aging factor: rainwater (wetting), temperature (heat), sunlight (ultraviolet), mechanical wear (sandstone embedding).Under the repeated action of above-mentioned factor, the filler of pointing in seam can wear out gradually, but ager process the fastest still be exposed to seam table material layer under sunlight and the mechanical wear effect.
The information analysis of collecting on the spot for many years from the inventor, through the time in 2～3 years, the top layer of only having 1/2nd places, filler upper strata, be that 8～12mm thick packing layer aging phenomenon in filler top is obvious, and the material aging degree below 8～12mm and not serious, can both keep preferably color and luster, elasticity and intensity, can keep certain bonding with slotted wall yet, this does not just provide the foundation for the inventor does not expand multiple filling of seam.
The inventor need only dispose the aging filler on the filler top 1/2nd in the seam, and needn't all remove old filler when multiple filling raked joint.Then new filler is poured in the seam, make new, old material become as a whole.So not only can saving of work and time, can also economize on resources.But the key of problem is that this material of newly inserting must possess the technical performance of following three keys: 1. it should have fabulous compatibility and ply adhesion (between new, the old material) with various old pointings; 2. it must have fabulous flowability, the material that new filling is filled out can automatically infiltrate old material the slit and damaged in, and contain whole old material, make new and old material form an integral body; 3. the performance such as it and concrete adhesion strength, elongation per unit length (deformability), useful life longevity all must meet the index of the provisions of the relevant regulations issued by the State.
For second reason: fill with again the requirement of not expanding joint stabilizing process by seam, old filler top 8～12mm in the former seam need only be disposed, so just make raked joint technique become simply too much, on the market commercially available general device for cleaning gap or self-control plant equipment can both be under the prerequisite of seam not being widened (8～12mm) dispose the top of old filler in seam.
Conclusion:
In sum, change the existing maintenance pattern of cement concrete road slab joint, must accomplish following 2 points, just can make the cement concrete road slab joint not expand seam and fill with again technique and have exploitativeness.
1. must design a kind of novel seam raked joint activities, 1/2nd of filler top in the seam can be removed, slotted wall not widened or injury again.
2. must design a kind of novel pointing that can be compatible with existing various types of filler on the market, can remain 1/2nd old filler realization infiltration, bonding, containing in the butt joint, make new and old material form an integral body, can satisfy again the technical requirements of joint filler, to guarantee the normal function of seam.
Summary of the invention
Seam is not expanded in a kind of cement concrete road slab joint that the present invention proposes, and to fill with again technique be a kind of brand-new theory in the maintenance work.
Therefore, the purpose of this invention is to provide a kind of cement concrete road slab joint does not expand seam and fills with again technique.Cement concrete road slab joint provided by the invention is not expanded seam and is filled with again technique, may further comprise the steps: (seeing Fig. 3)
(1) raked joint: with the old filler in the seam, down dispose 1/2nd of gross thickness from old filling surface with the raked joint plant equipment.Joint filler is filled with the thickness of filling out and is generally 15～20mm, therefore, generally down disposes about 8～12mm from old filling surface and gets final product.But in the process of removing old filler, seam two walls can not be widened or injury.Described raked joint plant equipment has no particular limits, and just can use as long as can reach the purpose of raked joint, and it can commercially obtain or self-control.
(2) polishing: polish with grinding machine equipment interconnection seam, slotted wall two wall tops and seam are clean along upper silt particle and dirt removal, make it expose the concrete true qualities.Described sander has no particular limits, and just can use as long as can reach the purpose of polishing.
(3) flushing: old filler residue, silt particle and dirt in water will stitch are rinsed well.For in order to be effective, can preferably use giant.
(4) blow off: the ponding in will stitching dries up, and guarantees that seam is totally dry.For in order to be effective, can preferably use the high pressure air pressure gun.
(5) material filling: will not expand the multiple new filler filling of filling with of seam for the road slab joint and fill out through in the seam of above step process.
Not expanding seam in cement concrete road slab joint of the present invention fills with in the technique again:
In step (1), remove in the process of former filler, two walls of seam can not be widened or injury.Namely don't work what job practices and construction equipment when filling with the old filler of filling out in removing former seam, all can not be widened former seam or injury.
In step (5), described new filler and old filler are fully compatible and bonding is firm.Described new filler has can have fabulous compatibility and interlaminar bonding power with common all kinds of joint fillers on the outer market of Present Domestic (as: fillers such as modified bitumen class, polyurethanes, modified polyurethane, silicone based, polysulfide rubber class).That is, no matter filling with what fill out in the former seam is above-mentioned that a kind of filler, after new filler pours into, and must be fully compatible with the filler that former filling is filled out and bonding is firm.
In step (5), described new filler denseness is little, and good fluidity can penetrate in the damaged and slit of old filler, thereby new, old filler contains mutually, bonds, and forms an integral body.
In step (5), described new filler is " the HZ/ZD-4 type contracting seam repair materials " of the independent research of Hunan space China traffic engineering Materials Co., Ltd, production.
Beneficial effect
A kind of cement concrete road slab joint provided by the invention is not expanded seam and is filled with again technique and fill with again technique with existing seam and compare, and following difference is arranged:
1, when the cement concrete road slab joint is filled with again (seam is called multiple filling when filling with filler for the second time), seam two walls can not be widened or injury;
When 2, filling with again, only use the seam Central Plains filler of haveing been friends in the past, down dispose 1/2nd thickness from the surface, namely remove the old packing layer (thickness of general filler is between 15～20mm in the seam) of 8～12mm;
When 3, filling with again, the filler that newly pours into can penetrate in the damaged and slit of remaining old filler in the seam, can mutually contain, be bonded to as a whole with old filler, and form on seam top one firm, smooth smooth along bonding with slotted wall, seam, thickness is the new filler covering layer of 8～12mm.(seeing Fig. 4).
Description of drawings
Fig. 1 is seam kind schematic diagram.
Fig. 2 is contracting seam and expansion joint (E.J.) schematic diagram, and wherein the A among Fig. 2 A is the concrete panel, and (dark: 50～60mm), C is the wide 4～5mm of seam to B for the contracting seam; A among Fig. 2 B is the concrete panel, and B is expansion joint (E.J.) (connecting the concrete body), and C is the wide 20～25mm of seam.
Fig. 3 is that seam of the present invention does not expand seam and fills with again process flow diagram.
Fig. 4 is that seam of the present invention does not expand seam and fills with again process flow diagram
The specific embodiment
With reference to the accompanying drawings 3 and 4, the present invention is illustrated in further detail.Should be understood that: this embodiment only is used for explanation the present invention, rather than limitation of the present invention.
Generally speaking, so long as all kinds of panels of laying with cement concrete, for preventing being damaged because the rule of expanding with heat and contract with cold makes concrete plate, all must various seams be set according to the structure of plate and the requirement of application function, thereby all belong to applied technical field of the present invention.Specifically can be divided into again following large aspect:
1, the cement concrete road of various grades:
1. advanced road: contain speedway, accommodation road, service center etc.;
2. ordinary road: contain state, province, city, county's Class IV highway network and bridge tunnel;
3. urban road: contain avenue network, bridge tunnel and elevated road;
4. country road: contain county, villages (towns), village (village), group (team) Class IV highway network and bridge tunnel.
2, the runway on the military, civilian airport of various grades, taxiway, connecting taxiway, apron and site inside accesses road;
3, cement concrete bridge, tunnel, the culvert of various standard highways;
4, the Ba Qu of various grade water conservancies, power construction, power station, reservoir, flood control dam etc.;
5, the cement concrete road surface of subway, high speed railway construction, the level ground etc. of standing.
Cement concrete road slab joint of the present invention is not expanded seam and is filled with again technique and fill with again technique with existing seam and compare, and has following four large advantages:
First advantage: the seam of cement concrete road panel can not widened.The benefit of its maximum is exactly to reduce to greatest extent the generation of cement concrete road disease; Can effectively postpone the process of disease high-incidence season.Thereby can prolong cement concrete road effective application life more than 10 years.From the present situation of current China cement concrete road, about 4,000,000 kilometers of the total kilometrage of cement concrete road.The cement road of its better-than-average level just reaches 1,500,000 kilometers, and it comprises about 600,000 kilometers of urban road network, about 400,000 kilometers of country road network, about 500,000 kilometers of the above state of speedway and secondary, province arterial highway; About more than 1000 on large and small military-civil airport (containing runway, taxiway, connecting taxiway, apron, stand level ground and road in airport etc.) in addition.If the road face of bridge, tunnel, culvert, Ba Qu, power station, reservoir, flood control dam and subway, high-speed railway, the level ground of standing are counted, the quantity of its cement concrete road (face) is huge especially again.They fill with this new principle and technique again if can both carry out not expanding seam in the maintenance of seam, will produce huge economic benefit and social benefit to national economy.
Second largest advantage: be highway administration department at different levels innovation on a kind of concept in the foster work of pipe.It not only can be simplified the highway pipe and support program, reduces the consumption of manpower, financial resources, and all right Resource Recycling Utilization (old filler) is accomplished to get twice the result with half the effort, make the best use of everything.
The third-largest advantage: can to the panel injury of cement concrete road, just can not keep long-term effectively visual appearance, the comfortable and traffic safety of driving of cement roads at different levels.
The fourth-largest advantage: the discarded object (old filler) in the time of effectively reducing seam and fill with again also is that seam does not expand the advantage that seam is filled with the technique maximum again to the pollution of environment.Estimate roughly that by the road fabric width seam of every kilometer cement concrete road has two, three kms at least, has more than the myriametre at most.If the highway that the whole nation is millions of kilometers is all still by old multiple filling activities, when filling with again at every turn, all old filler is all cleared out, not only waste a large amount of resources, and the chemical substance that can not degrade in the nature next part, also can cause serious pollution to human environment, its severity of consequence can't be estimated.In fact, if the seam that do not expand of advocating by the present invention is filled with technological process again, the fill resources that will have more than 1/2nd can recycle.Not only can economize on resources, reduce cost, also will in environmental protection cause, bring into play huge effect.
Embodiment
In one: 2009 year September of example, the inventor utilizes cement concrete road slab joint of the present invention not expand seam and fills with again technique and the cement concrete seam of the Peach Garden, Hunan Province airfield runway and apron has been carried out multiple filling, about 100,000 linear meter(lin.m.)s of engineering quantity.
With the old filler modified polyurethane in the seam, downwards dispose about 1/2nd (12mms) of gross thickness from old filling surface with the raked joint plant equipment, it is 25mm that former joint filler is filled with the thickness of filling out.
Polish with the electric grinding machine butt joint, slotted wall top and seam is clean along upper silt particle and dirt removal, make it expose the concrete true qualities.In this process, two walls of seam can not be widened and damaged.
Use the giant pump, old filler residue, silt particle and dirt in water will stitch are rinsed well.
Use the high pressure air pressure gun will stitch interior ponding and dry up, guarantee that seam is totally dry.
To fill with and fill out through in the seam of above step process for " HZ/ZD-4 type contracting seam repair materials " that the multiple new filler of filling with of seam-Hunan space China traffic engineering Materials Co., Ltd independent research, production are not expanded in the road slab joint, new filler is penetrated in the damaged and slit of old filler, make new, old filler containing, bonding form an integral body, and with through concrete two walls after the polishing cleaning and seam along bonding firmly, forms a thickness and is the new packing layer of 10mm, smooth smooth, the whole seam of covering.
With the cement concrete road after above-mentioned multiple the filling, after maintenance 2-3 hour, open to traffic immediately.
In two: 2009 years November of example, the inventor does not expand seam with cement concrete road slab joint of the present invention and fills with again technique to willow freeway management place, Guangxi District osmanthus linchpin Liuzhou to Guilin section D
2The tag splice seam has carried out multiple filling, about 120,000 linear meter(lin.m.)s of engineering quantity.Its processing step is identical with example one.
Claims (6)
1. a cement concrete road slab joint is not expanded seam and is filled with again technique, it is characterized in that: may further comprise the steps:
(1) raked joint: with the old filler in the seam, down dispose 1/2nd of gross thickness from filling surface with the raked joint plant equipment;
(2) polishing: polish with grinding machine equipment interconnection seam, slotted wall top and seam is clean along upper silt particle and dirt removal, make it expose the concrete true qualities;
(3) flushing: old filler residue, silt particle and dirt in water will stitch are rinsed well;
(4) blow off: the ponding in will stitching dries up, and guarantees that seam is totally dry;
(5) material filling: will not expand the multiple new filler filling of filling with of seam for the road slab joint and fill out through in the seam of above step process.
2. cement concrete road slab joint according to claim 1 is not expanded seam and is filled with again technique, it is characterized in that: in step (1), from old filling surface dispose downwards gross thickness 1/2nd for to dispose 8～12mm downwards from old filling surface.
3. cement concrete road slab joint according to claim 1 is not expanded seam and is filled with again technique, it is characterized in that: in step (1), remove in the process of old filler, two walls of seam can not be widened or injury.
4. cement concrete road slab joint according to claim 1 is not expanded seam and is filled with again technique, it is characterized in that: in step (5), described new filler and old filler must be fully compatible and bonding firmly.
5. cement concrete road slab joint according to claim 1 is not expanded seam and is filled with again technique, it is characterized in that: in step (5), the necessary denseness of described new filler is little, good fluidity, can automatically penetrate in the damaged and slit of old filler, make new, old filler contain mutually, bond, form an integral body.
6. cement concrete road slab joint according to claim 1 is not expanded seam and is filled with again technique, and it is characterized in that: described old filler is modified bitumen class, polyurethanes, modified polyurethane, silicone based or polysulfide rubber class filler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010229589 CN102330401B (en) | 2010-07-13 | 2010-07-13 | Joint-expansion-free refilling process for cement concrete road slab joint |
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| CN 201010229589 CN102330401B (en) | 2010-07-13 | 2010-07-13 | Joint-expansion-free refilling process for cement concrete road slab joint |
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| CN102330401B true CN102330401B (en) | 2013-05-29 |
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| CN105064153B (en) * | 2015-07-21 | 2016-08-03 | 中南大学 | A kind of method processing CRTS II plate-type fragment-free track slab seam crossing crack |
| CN106567306A (en) * | 2016-11-05 | 2017-04-19 | 中交航局第四工程有限公司 | Airport cement concrete pavement joint chamfering construction method |
| CN111218876B (en) * | 2018-11-27 | 2021-07-16 | 长春市市政工程设计研究院 | Cement concrete pavement wet assembling process with three-dimensional embedding and extruding joint |
| CN114990957A (en) * | 2022-04-28 | 2022-09-02 | 罗正宇 | Cement concrete pavement joint maintenance five-three-two technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7021858B2 (en) * | 2004-02-12 | 2006-04-04 | Temenuzhka Bencheva Beloreshka | Double joints pavement system |
| CN101348613A (en) * | 2007-07-18 | 2009-01-21 | 中国石油天然气股份有限公司 | Non-aqueous road modified asphalt cold-grouting joint material and preparation method thereof |
| CN101591883A (en) * | 2009-06-09 | 2009-12-02 | 赵海刚 | Concrete road crack treating method |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7021858B2 (en) * | 2004-02-12 | 2006-04-04 | Temenuzhka Bencheva Beloreshka | Double joints pavement system |
| CN101348613A (en) * | 2007-07-18 | 2009-01-21 | 中国石油天然气股份有限公司 | Non-aqueous road modified asphalt cold-grouting joint material and preparation method thereof |
| CN101591883A (en) * | 2009-06-09 | 2009-12-02 | 赵海刚 | Concrete road crack treating method |
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