CN103774553A - Steel bridge deck paving structure and construction method thereof - Google Patents
Steel bridge deck paving structure and construction method thereof Download PDFInfo
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Abstract
The invention discloses a steel bridge deck paving structure and a construction method thereof. A combined type connecting layer and an ultrahigh-viscosity modified asphalt mastic rubble layer are laid on a bridge deck steel plate of a steel bridge deck in sequence, wherein the combined type connecting layer comprises a first modified epoxy resin and rubble layer and a second modified epoxy resin and rubble layer, a bonding material layer is further arranged between the combined type connecting layer and the ultrahigh-viscosity modified asphalt mastic rubble layer, and the bonding material layer is made of active epoxy resin materials. Compared with a traditional epoxy resin asphalt concrete bridge deck paving layer, the steel bridge deck paving structure and the construction method are low in construction cost, needless for dedicated equipment, beneficial to construction organization and high in construction speed, and have clear advantages on road sections with high traffic pressure.
Description
Technical field
The invention belongs to Steel Bridge Deck design, construction and maintenance repairing technique field, particularly relate to a kind of paving structure and construction method thereof of Steel Bridge Deck.
Background technology
Paving steel bridge deck is the important component part of bridge driving system, and its quality directly has influence on safety, comfortableness, bridge durability and returns of investment and the social benefit of driving.The appearance of orthotropic deck system, reduce significantly the weight of bridge, make the longer across footpath of bridge, promoted the construction of large span bridge, steel deck paving packing technique is to be accompanied by the construction of large span bridge and the special pavement technique of a high-tech difficulty growing up.Because the stiffness of orthotropic steel bridge deck system is little, distortion is large, very harsh to the requirement of paving steel bridge deck, thereby becomes a global difficult problem.Paving steel bridge deck is laid immediately on orthotropic plate, carry at traffic load, wind, under the factor impact such as variations in temperature and Steel Bridge Deck local distortion, its force and deformation is far beyond highway pavement or airfield runway complexity, thereby its high-temperature stability, antifatigue cracking behavior, retinue's property to steel plate deformed, deformation characteristic, layers cementing and perfect anti-drainage system etc. are all had to high requirement.Meanwhile, due to the residing specific position of mating formation, in functional performance, have again lightweight, caking property is high, the specific (special) requirements such as waterproof.
China's paving steel bridge deck successively used asphalt concrete, modified asphalt concrete, SMA, epoxy asphalt concrete, cast asphalt concrete, retinasphal combined system (ERS) etc., and the forms such as individual layer, bilayer, multilayer appearred in the structure of paving steel bridge deck.Due to the feature of this body structure of Steel Bridge Deck, Steel Bridge Deck Pavement force and deformation situation is more than highway pavement complexity, the rigidity of Steel Bridge Deck is less, be out of shape larger, in the utilization of Practical Project, compared with prevailing roadway deck, Steel Bridge Deck Pavement is more prone to the multiple diseases such as rut, cracking, delamination.
Germany is the country that the earliest Steel Deck Pavement System is launched research, subsequently the country such as the U.S., Britain, Denmark, Japan, Holland also priority carried out correlative study, the object of its theory analysis and numerical computations is to provide design parameters for paving steel bridge deck.The structure types that countries in the world are selected aspect paving steel bridge deck is all not quite similar with paving shape material and thickness, generally comprises two basic aspects of waterproofing course and asphalt concrete pavement.Paving steel bridge deck bituminous mixture mainly contains three kinds of systems: cast asphalt concrete (Mastic Asphalt), asphalt-mastic-broken stone (Stone Mastic Asphalt is called for short SMA) and epoxy asphalt concrete (Epoxy Asphalt).These three kinds of materials are respectively used to different mating formation in layer position according to the difference of its performance, but because paving steel bridge deck has thinner thickness and stressing conditions complexity, Steel Bridge Deck Pavement is very easily destroyed.Comparatively speaking epoxy asphalt concrete intensity is higher, durability, but the preparing process more complicated of epoxy asphalt mixture, and very strict to the requirement of time and temperature in construction, difficulty of construction is large, and material and construction cost are higher.
In recent ten years, in many Large Span Bridges of China's construction, Orthotropic Steel Bridge Deck system is owing to more and more being applied from heavy and light and good economy performance.But the problem of mating formation of orthotropic steel bridge deck, is not yet well solved at home, mostly there is the disease such as bottom (being bridge deck) delamination and slippage of rut, cracking, asphalt concrete pavement and Steel Bridge Deck in various degree.The built Large Span Bridges using of current China, because the technical scheme adopting is unreliable, the diseases such as most existence rut, cracking, asphalt concrete pavement and bridge deck delamination and slippage in various degree.
Analyzing domestic and international steel bridge asphalt pavement behavior in service finds, poor high temperature stability and fatigue cracking be orthotropic steel bridge deck mat formation produce destroy principal mode, the basic reason of studying carefully its destruction is that bridge deck are inadequate to retinue's property of asphalt concrete pavement distortion, layers cementing poor durability, and then cause bridge deck and asphalt concrete pavement delamination and slippage and destroy.Thereby active demand is a kind of can meet the special climatic environment requirement of China, can meet again a large amount of heavy duties of China and Overload Traffic condition, simultaneously to construction technology and the looser Steel Bridge Deck protective device of construction environment.
Summary of the invention
Based on this, the object of this invention is to provide a kind of paving structure of Steel Bridge Deck, between this paving structure and Steel Bridge Deck, can form enough adhesion stresss, avoiding mating formation comes off between layer soffit and bridge surface armor plate, bridge surface armor plate is played to the effect of protection.
Concrete technical scheme is as follows:
A kind of paving structure of Steel Bridge Deck, on the bridge surface armor plate of Steel Bridge Deck, lay successively combined type binder couse, superelevation adhered modification asphalt-mastic-broken stone layer, described combined type binder couse comprises the first modified epoxy-macadam, the second modified epoxy-macadam from bottom to top successively; Between described combined type binder couse and superelevation adhered modification asphalt-mastic-broken stone layer, be also provided with bonding material layer; Described bonding material layer is active epoxy resin material.
Therein in an embodiment, the adhesion stress >5MPa of the modified epoxy that described the first modified epoxy-macadam and the second modified epoxy-macadam use, elongation per unit length >65% at 23 ℃, in the first modified epoxy-macadam, the consumption of modified epoxy is 1.0-1.5kg/m
2, in the second modified epoxy-macadam, the consumption of modified epoxy is 4.0-5.0kg/m
2.
In an embodiment, the superelevation adhered modification pitch using in described superelevation adhered modification asphalt-mastic-broken stone layer is the special modified pitch that at 60 ℃, viscosity is greater than 200000Pa.S therein.
In an embodiment, the consumption of the active epoxy resin material that described bonding material layer uses is 2.0-3.0kg/m therein
2.
In an embodiment, the average diameter of the rubble that described the first modified epoxy-macadam and the second modified epoxy-macadam use is 3-6mm therein.
In an embodiment, the thickness of described combined type binder couse is 6-12mm therein.
Another object of the present invention is to provide a kind of construction method of bridge deck pavement structure.
Concrete technical scheme is as follows:
The construction method of above-mentioned bridge deck pavement structure, comprises the steps:
(1) adopt surface sand-blasting treatment technology to process the bridge surface armor plate of Steel Bridge Deck, make bridge surface armor plate rough surface, clean, dry, pollution-free;
(2) at the uniform brushing modified epoxy of steel bridge surface of steel plate, then excessive spreading 3-6mm rubble on modified epoxy immediately, cover all liquid resins until resin liquid is can't see on surface, after resin solidification 2-3h, remove the not firm rubble of bonding, form the first modified epoxy-macadam;
(3) at the first modified epoxy-macadam surface spread modified epoxy, then excessive spreading 3-6mm rubble on modified epoxy layer immediately, cover all liquid resins until resin liquid is can't see on surface, after resin solidification 2-3h, remove the not firm rubble of bonding, form the second modified epoxy-macadam;
(4) spread binding material on the binder couse forming in step (2)-(3), forms bonding material layer;
(5) pave on bonding material layer superelevation adhered modification asphalt-mastic-broken stone layer roller-compaction, obtains the paving structure of described Steel Bridge Deck.
In an embodiment, the engineering time of described step (2)-(6) is 8-10h therein.
Steel Bridge Deck system is from heavy and light, distortion is large, destroy how inadequate to retinue's property of bridge deck distortion from asphalt concrete pavement, layers cementing poor durability, and then cause delamination and slippage between bridge deck pavement and bridge surface armor plate and destroy, can corrosion steel plate in the situation that water exists, totally unfavorable to bridge security, so is connected with protection question and plays vital effect for the success or not of whole paving steel bridge deck between bridge deck pavement and bridge surface armor plate.Therefore the structural material, contacting with bridge surface armor plate should be considered following key property: impermeability, heat-resistant stable, low temperature resistant toughness, durability, shear strength, adhesion strength, construction operability etc.The modified epoxy material that binder couse of the present invention adopts is the polymer system that a kind of special three-phase mixes, this polymer is particularly outstanding to the adhesion stress of steel work, also can keep at low temperatures good pliability simultaneously, the combined type modified epoxy rubble binder couse that modified epoxy and 3-6mm rubble form, can waterproof, antirust, this thin layer has the adhesion stress of steel work strong, deformation space is large, intensity is high, the good characteristics that shear resistance is strong, effectively absorb the relative displacement of mating formation between layer and bridge deck, play the effect of stress absorbing layer, thereby realize retinue's property good between Steel Bridge Deck Pavement and bridge surface armor plate, greatly degree has solved the problem of Longspan Bridge large deformation.
Due to the design feature of Steel Bridge Deck, Steel Bridge Deck Pavement internal temperature under summer hot environment is higher, generally can reach 60 ℃-70 ℃, this high-temperature stability to Steel Bridge Deck Pavement is very disadvantageous, therefore, the present invention adopts the part of superelevation adhered modification asphalt-mastic-broken stone (SMA) layer as whole firm bridge deck pavement, superelevation adhered modification asphalt-mastic-broken stone (SMA) compound has good high-temperature behavior, cryogenic property, anti-water damage and anti-fatigue performance, and rough surface, cling property are good.In the present invention, use superelevation adhered modification pitch to have the advantages that viscosity is large, 60 ℃ of dynamic viscosities are greater than 200000Pa.s, and pitch functional performance classification simultaneously reaches PG82-22 grade, can give full play to the good pavement performance of stone mastic asphalt.
In addition the present invention has also laid bonding material layer between combined type binder couse and superelevation adhered modification asphalt-mastic-broken stone (SMA) layer, this binding material is active epoxy resin, make the adhesion stress between combined type binder couse and superelevation adhered modification asphalt-mastic-broken stone (SMA) layer reach 1.5-2.0MPa, this material can dissolve under bituminous mixture high temperature action, make the levels can be well-bonded, can regelate after bituminous mixture temperature declines.
Compared with prior art, the present invention has following distinguishing feature:
(1) modified epoxy and this bi-material of superelevation adhered modification pitch have been used, the adhesion stress of modified epoxy and steel bridge is strong, non-deformability is strong, shear resistance is strong, can effectively protect Steel Bridge Deck as waterproof binder couse, simultaneously by modified epoxy, 3-6mm rubble and bridge surface armor plate tight bond; Superelevation adhered modification pitch can guarantee that the good high-temperature behavior of stone mastic asphalt, pavement performance are not fully exerted.
(2) combined type modified epoxy rubble binder couse and the bonding material layer design of the bonding material layer of 2 layers of modified epoxy layer, 2 layers of macadam and one deck energy secure bond levels structure have been used, form the thick combined type binder couse of 6-12mm, overcome existing individual layer crushed stone medium stone surface and fail all to be covered and the steadiness producing and the hypodynamic shortcoming that bonds by resin.Rubble surface 100% in body series in the first macadam epoxy resin that is modified wraps, and rubble is evenly distributed, inlays firmly in resin, and closely links with steel plate.The adhesion stress of this structure and Steel Bridge Deck steel plate is strong, deformation space is large, intensity is high, shear resistance is strong, in the time that bridge surface armor plate deforms under variations in temperature or Driving Loading, binder couse can absorb the relative displacement of mating formation between layer and bridge surface armor plate, play the effect of stress absorbing layer, thereby realize the good retinue's property between layer and bridge surface armor plate of mating formation, therefore reduce and postpone the generation of the disease such as crack, bulge, realize the water-tight corrosion-proof function to Steel Bridge Deck.
(3) used the textural association of combined type modified epoxy rubble binder couse and superelevation adhered modification asphalt-mastic-broken stone (SMA) layer, the horizontal shearing stress that the coarse upper surface of combined type binder couse (construction depth reach 3.0mm more than) produces can effectively resist vehicle operating with the combination of superelevation adhered modification asphalt-mastic-broken stone (SMA) layer time, prevent the slippage between deck, guaranteed the stability of structure.And, use one 3-6mm rubble and superelevation adhered modification asphalt-mastic-broken stone (SMA) compound to be had to the binding material of good adhesion function, make the upper and lower layer of structural system form entirety.
(4) this new departure cost compared with traditional epoxy asphalt concrete bridge deck pavement is lower, does not need special equipment, be conducive to construction organization, and speed of application is very fast, and the section large for traffic pressure has a clear superiority in.
Accompanying drawing explanation
Fig. 1 is the generalized section of bridge deck pavement structure of the present invention.
Description of reference numerals:
101, bridge surface armor plate; 102, the first modified epoxy-macadam; 103, the second modified epoxy-macadam; 104, combined type binder couse; 105, bonding material layer; 106, superelevation adhered modification asphalt-mastic-broken stone (SMA) layer.
The specific embodiment
Below in conjunction with drawings and Examples, the application is further elaborated.
As shown in Figure 1, bridge deck pavement structure of the present invention, in accordance with the order from top to bottom, comprise superelevation adhered modification asphalt-mastic-broken stone layer 106, binding material 105, combined type binder couse 104, between superelevation adhered modification asphalt-mastic-broken stone layer and combined type binder couse, bond with binding material; Combined type binder couse is made up of the first modified epoxy-macadam 102, the second modified epoxy-macadam 103, is set directly on bridge surface armor plate 101.
1, material requirements
(1) modified epoxy: the macromolecule resin material that preferably adopts Dow Chemical company (DOW) to produce, its main component is binary hybrid macromolecule resin, in formula, not containing any filler and volatile solvent, this hydridization polymer system can provide superior low temperature flexibility and fabulous weatherability.When using, modified epoxy gets according to a certain percentage corresponding resin Composition (PartA) and curing agent component (PartB) stirs, according to volume ratio A component: abundant stirring 5min after B component=1:1 mixes.Its main performance and index are as table 1-2.
Table 1 modified epoxy main performance index
Table 2 modified epoxy and steel plate pull-out test result
(2) superelevation adhered modification pitch: the high adhered modification pitch that preferably adopts shell (Foshan) Xin Yue pitch Co., Ltd to produce.Its leading indicator is as table 3.
Table 3 high adhered modification pitch main performance index
(3) rubble material: comprise gathering materials of using in the 3-6mm rubble that uses in binder couse and high adhered modification asphalt-mastic-broken stone (SMA) layer.Selected coarse aggregate should be typical high grade highway pavement use and gathers materials, and meets (JTGF40-2004) quality requirement standard of China's " standard specification for construction and acceptance of highway asphalt pavement ", is preferably basalt, diabase.Fine aggregate must adopt Machine-made Sand (100% fragmentation processes), should be clean, dry, without weathering, free from admixture, there is good adhesiveness with pitch, and should adopt limestone to process.
(4) binding material: the active epoxy resin that preferably adopts Dow Chemical company (DOW) to produce, this material can dissolve under bituminous mixture high temperature action, makes the levels can be well-bonded, can regelate after bituminous mixture temperature declines.Compare as table 4 with the adhesive property of similar binding material.
The pull-out test result of the different binding materials of table 4
2, construction technology
The construction method of this paving steel bridge deck is as follows, comprises the following steps:
(1) Steel Bridge Deck steel plate processing
Adopt surface sand-blasting (ball blast) treatment technology to process Steel Bridge Deck surface steel sheet, to obtain the bridge deck surface of even roughness, make to form between modified epoxy waterproof binder couse and steel bridge deck enough adhesion stresss, brake with opposing heavy-duty vehicle the interlayer shear stress causing, avoid causing mating formation coming off between layer soffit and bridge deck.So, before surface sand-blasting (ball blast) construction, require the residues such as dust out, aggregate chips, sand grains, guarantee bridge deck surface cleaning, dry, pollution-free.In sandblast (ball blast) processing procedure, require equipment continuously, at the uniform velocity carry out.The position, corner that cannot process sand-blasting machine supplements processing with portable sander or motor wire brush.Surface of steel plate after treatment can not touch water, sweat, oil or other pollutants again, otherwise need again process.Process at steel plate the combined type binder couse of constructing in latter 0.5 hour.
(2) combined type binder couse construction
Combined type binder couse is made up of modified epoxy and 3-6mm rubble, is the fabricated structure of 2 layers of rubble of 2 layers of resin by sequence of construction.3-6mm rubble need to be washed and dry, and all rubbles should be stored in a dry dustless environment, are not subject to the pollution of job site, are not also subject to the impact of sleet moisture.This laminate structure forms the water-tight corrosion-proof binder couse interface of rubble, modified epoxy and the mutual secure bond of steel plate and coarse antiskid interface, thereby make Steel Bridge Deck and the layer of mating formation have good adhesive property, prevent from oozing contact bridge panel under moisture, corrode steel.Meanwhile, combined type binder couse upper surface is coarse, can effectively prevent the shearing slip of mating formation between layer and combined type binder couse.When the construction of the first modified epoxy-macadam, the modified epoxy mixing is in proportion pressed and set consumption (1.0-1.5kg/m
2) spread upon uniformly surface of steel plate, if construction area is large, use the machinery of regulation measure, stir and splash, engineering truck should be equipped with the displacement pump with volume-displacement of hydraulic control, and immediately at resin layer surface spreading 3-6mm rubble, rubble is answered excessive spreading, cover all liquid resins until resin liquid is can't see on surface, spread in the binder couse system solidification process of gather materials (3-6mm rubble), should be noted that anti-sealing or other pollutants touch binder couse, about 2 hours of hardening time, form the first modified epoxy-macadam.After cured the removal of gathering materials of excessive spreading on the first modified epoxy-macadam (can first be swept out gathering materials of surface, then absorb by vacuum or pressure-air by the not firm removal of gathering materials of bonding), then repeat the operation of first floor, now the content of epoxy resin of the second modified epoxy-macadam is than the large (4.0-5.0kg/m of first floor
2), and then excessive spreading 3-6mm rubble at once, remove unnecessary gathering materials by same method, form the second modified epoxy-macadam.On the second modified epoxy-macadam, smear the binding material as bonding levels structure, the consumption of the active epoxy resin material that bonding material layer uses is 2.0-3.0kg/m
2, pave in 2-3h after having constructed superelevation adhered modification asphalt-mastic-broken stone (SMA) layer of binding material.
The engineering time of combined type binder couse and bonding material layer is 8-10h.
(3) superelevation adhered modification asphalt-mastic-broken stone (SMA) mixture laying
The construction technology of superelevation adhered modification asphalt-mastic-broken stone (SMA) compound is identical with plain asphalt mastic-broken stone (SMA) compound, but with regard to control with raw material aspect, must guarantee that the classification of superelevation adhered modification pitch functional performance reaches PG82-22,60 of superelevation adhered modification pitch ℃ of dynamic viscosities also need to reach the requirement of 200000PaS in addition.Because the viscosity of superelevation adhered modification pitch is larger, therefore in the time mixing and stirring and pave, can suitably improve construction temperature, guarantee the production of compound and roll and can carry out smoothly.Use superelevation adhered modification pitch can make SMA compound there is higher high-temperature stability, be conducive to high temperature area paving steel bridge deck.
Bridge deck pavement structure of the present invention, in the time of following situation, can not carry out the construction of combined type modified epoxy rubble binder couse: environment temperature is lower than 10 degrees Celsius; On steel bridge deck, have in after construction 8 hours of visible water or steam, forecast and will rain.As long as differ more than 3 degrees Celsius between bridge deck temperature and dew point, mist and high humility can not affect the final performance of construction and combined type modified epoxy rubble binder couse.
Carry out comprehensive examination and evaluation from construction and two aspects of reparation, Steel Bridge Deck Pavement construction method of the present invention is simple, and bridge deck pavement structure layer of the present invention all has high assurance to high-temperature stability, antifatigue cracking behavior, following to steel plate deformed, deformation characteristic, layers cementing and perfect anti-drainage system etc.Maintenance easily, has the advantages such as wear-resisting, antiskid, waterproof, ageing resistace is good, retinue's distortion is large, it is little to conduct oneself with dignity, long service life, convenience easy to maintenance.
Table 5 uses the comparison of the present embodiment bridge deck pavement structure and prior art Steel Bridge Deck structure
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. the paving structure of a Steel Bridge Deck, it is characterized in that, on the bridge surface armor plate of Steel Bridge Deck, lay successively combined type binder couse, superelevation adhered modification asphalt-mastic-broken stone layer, described combined type binder couse comprises the first modified epoxy-macadam, the second modified epoxy-macadam from bottom to top successively; Between described combined type binder couse and superelevation adhered modification asphalt-mastic-broken stone layer, be also provided with bonding material layer; Described bonding material layer is active epoxy resin material.
2. the paving structure of Steel Bridge Deck according to claim 1, it is characterized in that, the adhesion stress >5MPa of the modified epoxy that described the first modified epoxy-macadam and the second modified epoxy-macadam use, elongation per unit length >65% at 23 ℃, in the first modified epoxy-macadam, the consumption of modified epoxy is 1.0-1.5kg/m
2, in the second modified epoxy-macadam, the consumption of modified epoxy is 4.0-5.0kg/m
2.
3. the paving structure of Steel Bridge Deck according to claim 1, is characterized in that, the superelevation adhered modification pitch using in described superelevation adhered modification asphalt-mastic-broken stone layer is the special modified pitch that 60 ℃ of viscosity are greater than 200000Pa.S.
4. the paving structure of Steel Bridge Deck according to claim 1, is characterized in that, in described bonding material layer, the consumption of active epoxy resin material is 2.0-3.0kg/m
2.
5. according to the paving structure of the Steel Bridge Deck described in claim 1-4 any one, it is characterized in that, the average diameter of the rubble that described the first modified epoxy-macadam and the second modified epoxy-macadam use is 3-6mm.
6. according to the paving structure of the Steel Bridge Deck described in claim 1-4 any one, it is characterized in that, the thickness of described combined type binder couse is 6-12mm.
7. the construction method of the bridge deck pavement structure described in claim 1-6 any one, is characterized in that, comprises the steps:
(1) adopt surface sand-blasting treatment technology to process the bridge surface armor plate of Steel Bridge Deck, make bridge surface armor plate rough surface, clean, dry, pollution-free;
(2) at the uniform brushing modified epoxy of steel bridge surface of steel plate, then excessive spreading 3-6mm rubble on modified epoxy immediately, cover all liquid resins until resin liquid is can't see on surface, after resin solidification 2-3h, remove the not firm rubble of bonding, form the first modified epoxy-macadam;
(3) at the first modified epoxy-macadam surface spread modified epoxy, then excessive spreading 3-6mm rubble on modified epoxy layer immediately, cover all liquid resins until resin liquid is can't see on surface, after resin solidification 2-3h, remove the not firm rubble of bonding, form the second modified epoxy-macadam;
(4) spread binding material on the binder couse forming in step (2)-(3), forms bonding material layer;
(5) pave on bonding material layer superelevation adhered modification asphalt-mastic-broken stone layer roller-compaction, obtains the paving structure of described Steel Bridge Deck.
8. construction method according to claim 7, is characterized in that, the engineering time of described step (2)-(6) is 8-10h.
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| CN108797333A (en) * | 2018-06-14 | 2018-11-13 | 广州珠江黄埔大桥建设有限公司 | Combined steel bridge floor paving structure |
| CN108797333B (en) * | 2018-06-14 | 2020-10-09 | 广州珠江黄埔大桥建设有限公司 | Combined steel bridge deck pavement structure |
| CN108797397A (en) * | 2018-09-11 | 2018-11-13 | 安徽建筑大学 | A kind of reparation construction method suitable for large longitudinal slope bridge floor |
| CN112411372A (en) * | 2020-11-25 | 2021-02-26 | 上海浦兴路桥建设工程有限公司 | Thin-layer epoxy polymer concrete suitable for steel box girder bridge floor and preparation method thereof |
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