CN113526917A - Flexible epoxy mortar for paving steel bridge deck and preparation method thereof - Google Patents
Flexible epoxy mortar for paving steel bridge deck and preparation method thereof Download PDFInfo
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- CN113526917A CN113526917A CN202110854189.0A CN202110854189A CN113526917A CN 113526917 A CN113526917 A CN 113526917A CN 202110854189 A CN202110854189 A CN 202110854189A CN 113526917 A CN113526917 A CN 113526917A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses flexible epoxy mortar for paving a steel bridge deck and a preparation method thereof. The flexible epoxy mortar is composed of sand, cement and flexible epoxy resin, and the mass ratio of the sand to the cement to the flexible epoxy resin is as follows: sand: cement: the flexible epoxy resin is 850-1100: 300-500: 550 to 650. The flexible epoxy mortar provided by the invention has very high compressive strength and flexural strength, has good flexibility, is applied to a steel bridge deck pavement structure, has good steel plate following deformation capability, can adapt to large-deflection deformation of a steel bridge deck, ensures the deformation compatibility of a pavement layer structure and a steel plate, increases the bonding and frictional resistance between interfaces of the pavement layer, effectively resists shearing deformation between layers, can obviously reduce the probability of high-temperature stability diseases such as pushing, crowding, slipping, rutting and the like of a traditional SMA pavement structure system, and prolongs the service life of the steel bridge deck pavement structure.
Description
Technical Field
The invention relates to the field of transportation construction, in particular to flexible epoxy mortar for paving a steel bridge deck and a preparation method thereof.
Background
The steel bridge deck pavement layer has complex and severe use conditions due to the influence of complex and changeable natural environments and heavy traffic load, so far, no mature and generally applicable structural form and design method are formed in all countries in the world, and the steel bridge deck pavement is a worldwide difficult problem which troubles bridge workers. Because the performance of the steel bridge deck and the pavement layer material is greatly different, some special requirements are provided for the pavement layer: the pavement layer has enough shear strength and bonding strength with the steel bridge deck, and has good steel plate deformation following capability, anti-rutting capability, high and low temperature stability and the like. In order to solve the technical problem of paving a large-span steel bridge deck, China invests a large amount of funds, manpower and material resources to research the paving of the steel bridge deck, and tries various paving structure systems, wherein the paving structure systems typically comprise double-layer EA, double-layer SMA, GA + SMA, EA + SMA, UHPC and the like, but from the application condition, the damage condition of the paving layer of the steel bridge deck is still quite serious, the good operation of more than 10 years can be rarely maintained, and great economic loss and adverse social influence are caused.
The double-layer SMA paving system is widely applied to paving of the large-span steel bridge deck in China, but from the aspect of bridge operation, successful cases are few, so that the bridge is usually put into use for about 3-5 years, and serious diseases such as transition, cracking, crowding and even rutting occur on a paving layer, so that a plurality of large-span bridge management and maintenance units prefer to pave by adopting high-cost epoxy asphalt concrete. The traditional view points that the defects of rutting, moving and the like are generated by the double-layer SMA pavement of the steel bridge deck because the mixture generates shear creep at high temperature, namely, the defects are caused by insufficient shearing resistance of the mixture. In fact, when the interfacial binding force between the layers is insufficient, even the SMA has very good shearing resistance, which is not enough to prevent the pavement layer from generating the slippage disease between the interfaces.
Disclosure of Invention
The invention provides flexible epoxy mortar for paving a steel bridge deck, a preparation method and application thereof aiming at the current situation.
The technical scheme adopted by the invention is as follows:
the flexible epoxy mortar is composed of sand, cement and flexible epoxy resin, wherein the mass ratio of the sand to the cement to the flexible epoxy resin is as follows: sand: cement: the flexible epoxy resin is 850-1100: 300-500: 550 to 650.
According to the scheme, the flexible epoxy resin is formed by mixing the component A and the component B, wherein the A, B is prepared from the following components in percentage by mass (2.0-2.4): 1,
wherein the component A is composed of the following raw materials in percentage by mass:
the component B comprises the following raw materials in parts by mass:
88 to 95 percent of curing agent
5 to 12 percent of coupling agent.
According to the scheme, the epoxy resin material in the component A can be selected from at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, glycidyl ether resin and glycidyl amine resin.
According to the scheme, the ester epoxy substance in the component A can be at least one of epoxy butyl oleate, epoxy octyl oleate and epoxy decyl oleate.
According to the scheme, the toughening agent in the component A is a rubber toughening agent, and can be selected from at least one of nitrile rubber, polysulfide rubber and chloroprene rubber.
According to the scheme, the diluent in the component A can be selected from at least one of butanol, dibutyl ester, ethyl acetate, dibutyl phthalate and ethanol.
According to the scheme, the anti-sagging auxiliary agent in the component A can be at least one of fumed silica, filler talcum powder, emulsifying wax and organic bentonite.
According to the scheme, the coupling agent in the component B can be at least one of KH550, KH560, KH580 and KH 900.
According to the scheme, the curing agent is a polyamide curing agent, preferably a polyamide 651 or 650 polyamide curing agent.
According to the scheme, the cement is Portland cement, and the strength grade is not lower than 42.5.
According to the scheme, furthermore, the sand consists of 0.075-2.36 mm-grade fine sand, wherein the proportion of the fine sand is as follows: 0.075-0.15mm sand: 0.15-0.3mm sand: 0.3-0.6mm sand: 0.6-1.18mm sand: 1.18-2.36mm sand (5-11): (3-8): (6-13): (31-37): (42-53).
The preparation method of the flexible epoxy mortar is provided, and comprises the following preparation steps: putting 550-650 parts by mass of premixed flexible epoxy resin into a stirrer, stirring at a low speed for 1-2 min to obtain an epoxy resin material, then weighing 850-1100 parts by mass of sand, continuously pouring the sand into the epoxy resin stirrer, stirring for 2-5 min, finally weighing 300-500 parts by mass of cement, adding the cement into the stirrer, stirring for 2-3 min, and then stirring completely and uniformly to obtain the flexible epoxy mortar material.
The utility model provides a steel bridge face structure of mating formation based on pliability epoxy mortar, it is stratiform composite construction, and the structure from the bottom up on the steel bridge face does in proper order: steel sheet anticorrosive coating, first epoxy tie coat, pliability epoxy mortar transition cling compound layer, second epoxy tie coat and surface course, wherein: the flexible epoxy mortar transition anti-skid layer comprises a flexible epoxy mortar transition layer obtained from the flexible epoxy mortar and a rubble layer laid in the flexible epoxy mortar transition layer.
Furthermore, the steel plate anticorrosive layer is epoxy zinc-rich paint, and the thickness of the epoxy zinc-rich paint sprayed or brushed is 60-100 mu m, so that the steel plate anticorrosive layer is formed and has the functions of corrosion resistance and rust resistance;
further, the coating amount of the epoxy adhesive of the first epoxy adhesive layer is 0.4-0.6 kg/m2The thickness is controlled to be 0.5 to 1.0mmThe adhesive has triple functions of adhesion, water resistance and rust resistance;
further, the epoxy adhesive of the first epoxy adhesive layer is preferably a rubber toughening modified epoxy adhesive. Preferably, an epoxy binder having a similar composition to the flexible epoxy mortar forms an epoxy bond line, further contributing to a strong bond between the two. Further, the thickness of the flexible epoxy mortar transition layer is 4-6 mm;
further, when the construction temperature is higher than 25 ℃, the adopted flexible epoxy mortar has the following mixture ratio: sand: cement: the flexible epoxy resin is 850-1100: 300-500: 550-600 parts; when the construction temperature is lower than 15 ℃, the adopted flexible epoxy mortar has the following mixture ratio: sand: cement: the epoxy resin is 850-1100: 300-500: 600 to 650;
the construction temperature is higher and is higher than 25 ℃, the ratio of the flexibility-adjustable epoxy mortar is as follows: sand: cement: the flexible epoxy resin is 850-1100: 300-500: 550-600. At a higher temperature, the flexibility epoxy resin has lower viscosity and quicker strength formation, and the ratio of the flexibility epoxy mortar is regulated and controlled as follows: sand: cement: epoxy resin is 850-1100: 300-500: 550-600, can make epoxy mortar stir evenly, flow smoothly and self-compaction and form intensity fast in the construction allowance time, can avoid mortar material to sink and separate that mortar material mobility is too strong on the one hand, influence epoxy mortar's homogeneity and wholeness can be reduced on the other hand pliability epoxy resin quantity, practice thrift engineering cost.
The construction temperature is lower than 15 ℃, and the ratio of the flexible epoxy mortar is regulated and controlled as follows: sand: cement: the flexible epoxy resin is 850-1100: 300-500: 600 to 650. At a lower temperature, the flexibility epoxy resin has higher viscosity and slower strength formation, and the ratio of the flexibility epoxy mortar is regulated and controlled as follows: sand: cement: the epoxy resin is 850-1100: 300-500: 600-650, the mixing uniformity of the epoxy mortar can be enhanced, and the overall performance of the flexible epoxy mortar is improved.
Furthermore, the particle size of the broken stone in the flexible epoxy mortar transition anti-skid layer is 9.5-13.2 mm. The broken stones with proper particle size are beneficial to forming a stressed whole with the paved lower layer, and can be uniformly distributed and firmly embedded in the flexible epoxy mortar layer, so that the cohesive force and the shearing resistance of the mortar layer are ensured, and the functions of the mortar layer are fully exerted;
preferably, the crushed stone spread on the flexible epoxy mortar transition antiskid layer is dry and clean basalt crushed stone;
furthermore, the spreading rate of the broken stones is 70-80%, and the broken stones are spread in the initial setting process of the flexible epoxy mortar;
furthermore, the gravel particles on the surface of the flexible epoxy mortar are partially embedded into the mortar and partially embedded into the surface layer, preferably, the gravel with the depth of 1/3-1/2 is embedded into the flexible epoxy mortar, and the other part of the gravel is embedded into the surface layer;
further, the amount of the second epoxy adhesive layer is 0.4 to 0.6kg/m2. The epoxy adhesive used for the second epoxy adhesive layer is an epoxy adhesive which has both thermoplasticity and thermosetting property, and when the surface layer is paved, the adhesive is subjected to secondary curing reaction under a proper temperature condition, so that the surface layer and the flexible epoxy mortar transition layer are effectively bonded. The use of the second epoxy bonding layer can enhance the bonding effect of the flexible epoxy mortar transition layer and the surface layer;
further, the surface layer is recommended to be but not limited to a modified asphalt SMA surface layer, and preferably a high-viscosity modified asphalt SMA surface layer;
furthermore, the surface layer can be a single-layer paving structure or a multi-layer composite paving structure;
furthermore, the total thickness of the pavement structure is between 60 and 80 mm.
The construction method of the paving steel bridge deck structure based on the flexible epoxy mortar comprises the following specific construction steps:
(1) firstly, carrying out sand blasting and rust removal on the surface of a steel bridge deck steel plate;
(2) after the steel plate is subjected to sand blasting and rust removal, a steel plate anticorrosive coating is formed on the steel plate;
(3) uniformly spraying the flexible epoxy adhesive on the steel plate anticorrosive coating;
(4) after the epoxy adhesive on the steel plate is coated and dried, a first epoxy adhesive layer is obtained, flexible epoxy mortar is directly spread on the first epoxy adhesive layer, and the flexible epoxy mortar is self-compacted and molded;
(5) spreading broken stones in the initial setting process of the flexible epoxy mortar, and ensuring that the broken stones are partially embedded into the flexible epoxy mortar;
(6) uniformly coating an epoxy adhesive on the substrate;
(7) and finally, the paved surface layer is subjected to a curing reaction on the second epoxy bonding layer under a high-temperature condition, so that the surface layer and the flexible epoxy mortar are effectively bonded.
The epoxy resin of the invention has a large amount of epoxy groups, and a crosslinked cured product formed by the curing reaction of the epoxy resin and the curing agent polyamide has high crosslinking density, brittleness and poor impact resistance. The rubber toughening agent contains active groups, is subjected to block reaction with ring-opened epoxy resin, is compatible before curing, is subjected to phase splitting after curing to form a sea-island structure, has firm bonding of two-phase interfaces, does not influence the thermal deformation temperature of a material system while improving the toughness, and can obviously improve the cracking resistance, the fatigue resistance and the impact resistance of the mortar; the ester epoxy substance is safe, environment-friendly and nontoxic, contains a large amount of epoxy groups and flexible long chain structures, solves the problems of large brittleness and low elastic modulus of an epoxy resin curing system by introducing a flexible long chain segment into a cross-linking network after the epoxy resin is completely cured, can improve the elastic modulus and the bending strength, can keep proper viscosity by matching with a diluent and an anti-sagging auxiliary agent, is uniformly mixed with mortar, and has good adhesion strength, and the flexible epoxy mortar prepared by the synergistic effect has good flexibility.
The further flexibility epoxy mortar-based paving steel bridge deck structure can deform in cooperation with the steel plate, has good following deformation capacity, can well adapt to large-deflection deformation of the steel bridge deck plate, and guarantees deformation coordination of the paving layer structure and the steel plate.
The invention has the beneficial effects that:
(1) the flexible epoxy mortar provided by the invention has very high compressive strength and flexural strength, has good flexibility, has good steel plate following deformation capability when being used for paving a steel bridge deck, can well adapt to large-deflection deformation of a steel bridge deck, and ensures the deformation compatibility of a pavement layer structure and the steel plates.
(2) The flexible epoxy mortar has controllable forming speed of mortar strength by adjusting the component proportion, and can be used for winter and summer construction at different construction temperatures.
(3) The epoxy mortar provided by the invention has fine gradation, can be formed in a self-compacting way, has good water-sealing effect, can act together with the first epoxy bonding layer at the lower layer, plays a better waterproof role, effectively reduces the possibility that the steel plate of the bridge deck is corroded by moisture or chemical substances, can prolong the service life of the steel bridge deck, and effectively solves the problems of pushing, cracking and the like of the pavement layer of the steel bridge deck.
(4) The paved steel bridge deck provided by the invention is a layered composite structure, the steel plate anticorrosive layer, the first epoxy adhesive layer, the flexible epoxy mortar transition anti-slip layer, the second epoxy adhesive layer and the surface layer are sequentially arranged on the steel bridge deck from bottom to top, the broken stone particles on the surface of the flexible epoxy mortar are partially embedded into the mortar and partially embedded into the surface layer, so that a rivet effect is generated between the broken stone particles and the surface layer, uniformly distributed shear keys are formed, a good shear-resistant interface is formed, the bonding and the friction resistance between the interfaces are increased, the shearing deformation between the layers is effectively resisted, the probability of high-temperature stability diseases such as transition, humping, slippage, vehicle and the like of a traditional SMA paving structure system can be remarkably reduced, and the service life of the steel bridge deck paving structure can be prolonged.
Drawings
Fig. 1 is a schematic view of a steel bridge deck pavement structure applied by the invention.
FIG. 2 is a schematic representation of a flexible epoxy mortar transition skid resistant layer of the present invention.
FIG. 3 is a flow chart of the construction process of paving the steel bridge deck applied by the invention.
Fig. 4 is a structural view of the steel deck pavement in embodiment 3 of the present invention.
In the figure: 10 steel bridge deck slab;
20 epoxy zinc rich paint layer;
30 a first epoxy tie layer;
40 flexible epoxy mortar transition anti-skid layer;
41 a flexible epoxy mortar transition layer;
42 a crushed stone layer;
50 a second epoxy tie layer;
60 surface layers;
Detailed Description
In order that the objects of the invention will be more apparent, the invention is described in further detail below with reference to specific examples.
Example 1:
this example provides a flexible epoxy mortar prepared by the following steps:
step 1, firstly, preparing a flexible epoxy resin material according to the following steps.
a. Putting 45 parts by mass of bisphenol A type epoxy resin, 38 parts by mass of epoxy butyl oleate, 9 parts by mass of nitrile rubber, 6 parts by mass of butanol diluent and 2 parts by mass of fumed silica into a stirrer, and uniformly stirring to prepare the epoxy resin A component.
b. 89 parts by mass of polyamide 651 and 11 parts by mass of coupling agent KH560 are put into a stirrer and uniformly mixed to prepare the component B of the epoxy resin.
c. Adding the prepared epoxy A, B component into a stirrer according to the mass ratio of 2:1, and slowly stirring for 2min to obtain the epoxy material.
And 2, preparing the flexible epoxy resin, and then preparing the flexible epoxy mortar according to the following steps.
d. Weighing 1000 parts by mass of sand, continuously pouring the sand into the epoxy resin material obtained in the step 1, and stirring for 3min, wherein the proportion of the fine sand is as follows: 0.075-0.15mm sand: 0.15-0.3mm sand: 0.3-0.6mm sand: 0.6-1.18mm sand: 1.18-2.36mm ═ 8: 4: 8: 36: 44.
e. and weighing 400 parts by mass of C42.5 portland cement, adding into a stirrer, and stirring for 2min until the mixture is completely and uniformly stirred to obtain the flexible epoxy mortar material.
In the embodiment, the construction temperature is higher than 25 ℃, in order to ensure the performance of the flexible epoxy mortar, the mass part of the epoxy resin material in the flexible epoxy mortar is lower, and the mass part of the epoxy resin material in the embodiment is 550, so that the phenomenon that the uniformity and the overall performance of the epoxy mortar are influenced due to the fact that sand sinks and separates because the fluidity of the mortar is too strong is avoided.
Example 2:
this example provides a flexible epoxy mortar, which is prepared by a method different from that of example 1: because the construction temperature is lower than 15 ℃, in order to reduce the influence of overlarge viscosity of the flexible epoxy resin on the mixing uniformity, the mass parts of the epoxy resin material in the flexible epoxy mortar are selected to be higher, and the mass parts of the epoxy resin material in the embodiment are selected to be 650, so that the mixing uniformity of the epoxy mortar is enhanced, and the overall performance of the flexible epoxy mortar is improved.
Example 3: this example provides a flexible epoxy mortar, which is prepared by a method different from that of example 1: the flexible epoxy resin materials in the epoxy mortar are in different proportions.
The flexible epoxy resin material is prepared by the following steps:
a. 50 parts by mass of bisphenol A epoxy resin, 33 parts by mass of octyl epoxy oleate, 9 parts by mass of nitrile rubber, 6 parts by mass of butanol diluent and 2 parts by mass of fumed silica are put into a stirrer to be uniformly stirred, and the epoxy resin A component is prepared.
b. And (3) putting 93 parts by mass of polyamide 651 and 7 parts by mass of coupling agent KH560 into a stirrer, and uniformly mixing to prepare the epoxy resin component B.
c. Adding the prepared epoxy A, B component into a stirrer according to the mass ratio of 2:1, and slowly stirring for 2min to obtain the epoxy material.
Example 4: this example provides a flexible epoxy mortar, which is prepared by a method different from that of example 3: the flexible epoxy resin materials in the epoxy mortar are in different proportions.
The flexible epoxy resin material is prepared by the following steps:
a. 50 parts by mass of bisphenol A epoxy resin, 33 parts by mass of decyl epoxy oleate, 9 parts by mass of polysulfide rubber, 6 parts by mass of butanol diluent and 2 parts by mass of fumed silica are put into a stirrer to be uniformly stirred, and the epoxy resin A component is prepared.
b. And (3) putting 60 parts by mass of polyamide 651, 33 parts by mass of polyamide 650 and 7 parts by mass of coupling agent KH560 into a stirrer, and uniformly mixing to prepare the component B of the epoxy resin.
c. Adding the prepared epoxy A, B component into a stirrer according to the mass ratio of 2.2:1, and slowly stirring for 2min to obtain the epoxy material.
The epoxy mortars prepared in examples 1 to 4 were subjected to the related performance test, and the test results are shown in table 1 below.
Table 1 examples of the results of the Performance test of Flexible epoxy mortar
As can be seen from the test data: compared with the common epoxy mortar, the compressive strength and the flexural strength of the flexible epoxy mortar are obviously improved under different construction temperature conditions, and the bending strain under different temperature conditions is improved by more than 2 times, which shows that the flexible epoxy mortar has good flexibility and stronger deformation coordination capability with steel plates. Meanwhile, the flexible epoxy mortar has small porosity, is almost compact and has excellent waterproof performance.
Example 5
A steel bridge deck pavement structure based on flexible epoxy mortar is shown in figure 1, and the pavement structure is a layered composite structure and comprises an epoxy zinc-rich paint layer (steel plate anticorrosive layer) 20 laid on a steel bridge deck 10 subjected to sand blasting and rust removal, a first epoxy bonding layer 30, a flexible epoxy mortar transition anti-slip layer 40, a second epoxy bonding layer 50 and a surface layer 60. Wherein the flexible epoxy mortar transition skid resistant layer 40 comprises a flexible epoxy mortar transition layer 41 and a gravel layer 42, as shown in fig. 2.
The specific construction operation steps are shown in the following examples.
In this embodiment, the total thickness of the steel deck pavement structure is 75mm, the steel deck pavement construction flow chart is shown in fig. 3, the pavement structure chart is shown in fig. 4, and the concrete construction operation steps are as follows:
(1) firstly, carrying out sand blasting and rust removal on the surface of a steel plate, wherein the cleanliness of a steel bridge deck plate reaches Sa 3.0 level, and the roughness is 40-80 mu m.
(2) After the steel plate is subjected to sand blasting and rust removal, epoxy zinc-rich paint with the thickness of 60-100 mu m is uniformly sprayed or coated on the steel plate by a small-sized sprayer to form a steel plate anticorrosive layer, so that the steel plate anticorrosive layer has the functions of corrosion resistance and rust resistance.
(3) After the epoxy zinc-rich paint is dried completely, 0.5Kg/m of epoxy zinc-rich paint is sprayed by a small-sized sprayer2The coating amount of the epoxy resin is that the flexible epoxy adhesive is uniformly sprayed on the epoxy zinc-rich paint, and the flexible epoxy adhesive can be one of KR-692 rubber modified epoxy resin materials produced by Kyoho chemical engineering (Kunshan) limited and EPP-175 rubber modified epoxy resin materials produced by complexing high-tech materials limited.
(4) And (3) after the epoxy adhesive on the steel plate is coated and dried, obtaining a first epoxy adhesive layer, directly spreading the flexible epoxy mortar transition layer in the embodiment 1 on the first epoxy adhesive layer, and controlling the thickness of the flexible epoxy mortar transition layer to be 5mm, wherein the flexible epoxy mortar transition layer is formed in a self-compacting manner.
(5) In the initial setting process of the flexible epoxy mortar, broken stones with the diameter range of 9.5-13.2mm are spread, the spreading rate is 70-80%, and the broken stones are ensured to be embedded into the flexible epoxy mortar in the depth of about 1/3-1/2.
(6) The epoxy adhesive is evenly coated on the surface of the substrate, and the coating amount is 0.50Kg/m2This is the second epoxy adhesive layer.
(7) And finally paving a surface layer SMA with the thickness of 7cm, and carrying out curing reaction on the second epoxy bonding layer under the high-temperature condition of the surface layer SMA to realize effective bonding between the surface layer SMA and the flexible epoxy mortar transition layer.
The paving structure adopting the flexible epoxy mortar transition anti-skid layer in the embodiment and the paving structure not adopting the transition anti-skid layer are compared and tested, and the drawing bonding strength and the direct shearing strength between the asphalt mixture and the steel plate are tested according to an appendix B bonding strength test method and an appendix C shearing strength test method in Highway steel bridge deck pavement design and construction technical Specification JTG/T3364-02-2019 respectively, and the results are shown in the following table 2:
table 2 comparison of the performance test of the pavement structure in this embodiment with that of the conventional pavement structure
From the above test results it can be seen that: after the flexible epoxy mortar transition anti-skid layer pavement structure is adopted, the bonding strength between the flexible epoxy mortar transition anti-skid layer pavement structure and a pavement surface layer is improved by 1.1 times, the shearing strength between the pavement layers and the rutting resistance of the composite structure are obviously improved, wherein the shearing strength between the flexible epoxy mortar transition anti-skid layer pavement structure and the rutting resistance between the pavement layers is improved by more than 2.18 times, and the rutting resistance (rutting dynamic stability) of the composite structure is improved by more than 1.5 times.
For a double-layer SMA steel bridge deck pavement structure, the internal temperature of a pavement layer can reach more than 70 ℃ in summer, and the diseases such as rutting, pushing, crowding and the like caused by insufficient high-temperature stability are one of the most common diseases.
According to the invention, the self-made flexible epoxy mortar is adopted, is compounded as the transition layer and the thin rubble layer according to the designed pavement structure and is used as the waterproof bonding transition anti-slip layer, and is matched with other layers to obtain the steel bridge deck pavement, on one hand, the first epoxy bonding layer and the epoxy resin material adopted in the flexible epoxy mortar and the high-viscosity modified asphalt SMA with good comprehensive performance are jointly combined into a flexible pavement structure system, and the flexible pavement structure system can well adapt to the large-deflection deformation and does not crack of the steel bridge deck; on the other hand, the compact epoxy mortar has better waterproof effect, effectively reduces the possibility that the bridge deck steel plate is corroded by moisture or chemical substances, and can prolong the service life of the steel bridge deck; on the other hand, the macadam on the surface of the epoxy mortar is preferably embedded into the epoxy mortar in a depth of about 1/3-1/2, the other part of the macadam is embedded into the high-viscosity modified SMA mixture, a good interlayer anti-sliding and anti-shearing interface is formed by the rivet effect, multiple functions of water resistance, adhesion, shearing resistance and the like are achieved, effective adhesion between the SMA pavement layer and a steel plate is achieved, the interlayer shearing strength can reach 3.5MPa, the probability of high-temperature stability diseases such as pushing, encapsidation, slippage, rutting and the like of a traditional SMA pavement structure system is obviously reduced, the service life of the steel bridge pavement structure can be prolonged, the driving comfort is improved, and the high-viscosity modified SMA composite material can be widely applied to steel bridge pavement engineering.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any modifications, equivalents, improvements and the like made by those skilled in the art without departing from the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. A flexible epoxy mortar is characterized in that: the mortar consists of sand, cement and flexible epoxy resin, wherein the mass ratio of the sand to the cement to the flexible epoxy resin is as follows: sand: cement: the flexible epoxy resin is 850-1100: 300-500: 550-650; the flexible epoxy resin is formed by mixing a component A and a component B, wherein the A, B component has a mass ratio of (2.0-2.4): 1,
wherein the component A is composed of the following raw materials in percentage by mass:
the component B comprises the following raw materials in parts by mass:
88 to 95 percent of curing agent
5 to 12 percent of coupling agent.
2. A flexible epoxy mortar according to claim 1, characterized in that: the epoxy resin material in the component A is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, glycidyl ether resin and glycidyl amine resin;
the diluent in the component A is selected from at least one of butanol, dibutyl ester, ethyl acetate, dibutyl phthalate and ethanol;
the anti-sagging auxiliary agent in the component A is at least one selected from fumed silica, filler talcum powder, emulsifying wax and organic bentonite;
the coupling agent in the component B is at least one of KH550, KH560, KH580 and KH 900;
the curing agent is a polyamide curing agent.
3. A flexible epoxy mortar according to claim 1, characterized in that:
the ester epoxy substance in the component A is selected from at least one of epoxy butyl oleate, epoxy octyl oleate and epoxy decyl oleate;
the toughening agent in the component A is a rubber toughening agent and is selected from at least one of nitrile rubber, polysulfide rubber and chloroprene rubber.
4. A flexible epoxy mortar according to claim 1, characterized in that: the cement is Portland cement, and the strength grade is not lower than 42.5;
the sand consists of 0.075-2.36 mm-grade fine sand, wherein the fine sand comprises the following components in percentage by weight: 0.075-0.15mm sand: 0.15-0.3mm sand: 0.3-0.6mm sand: 0.6-1.18mm sand: 1.18-2.36mm sand (5-11): (3-8): (6-13): (31-37): (42-53).
5. The utility model provides a steel bridge deck structure of mating formation based on pliability epoxy mortar which characterized in that: it is multilayer composite construction, and the structure from the bottom up on the steel bridge floor does in proper order: steel sheet anticorrosive coating, first epoxy tie coat, pliability epoxy mortar transition cling compound layer, second epoxy tie coat and surface course, wherein: the flexible epoxy mortar transition skid resistant layer comprises a flexible epoxy mortar transition layer obtained from the flexible epoxy mortar of claim 1 and a gravel layer laid in the flexible epoxy mortar transition layer.
6. A paved steel bridge deck structure according to claim 5, wherein: the steel plate anticorrosive layer is made of epoxy zinc-rich paint, and the thickness of the epoxy zinc-rich paint sprayed or brushed is 60-100 mu m to form the steel plate anticorrosive layer;
the coating amount of the epoxy adhesive of the first epoxy bonding layer is 0.4-0.6 kg/m2The thickness is controlled to be 0.5-1.0 mm;
the surface layer is recommended to be but not limited to a high-viscosity modified asphalt SMA surface layer;
the surface layer is of a single-layer paving structure or a multi-layer composite paving structure;
the thickness of the flexible epoxy mortar transition layer is 4-6 mm;
the total thickness of the pavement steel bridge deck structure is 60-80 mm.
7. A paved steel bridge deck structure according to claim 5, wherein: when the construction temperature is higher than 25 ℃, the adopted flexible epoxy mortar has the following mixture ratio: sand: cement: the epoxy resin is 850-1100: 300-500: 550-600 parts;
when the construction temperature is lower than 15 ℃, the ratio of the flexible epoxy mortar is regulated and controlled as follows: sand: cement: the epoxy resin is 850-1100: 300-500: 600 to 650.
8. A paved steel bridge deck structure according to claim 5, wherein: the particle size of the broken stone in the flexible epoxy mortar transition anti-skid layer is 9.5-13.2 mm; the crushed stone spread on the flexible epoxy mortar transition antiskid layer is basalt crushed stone; the spreading rate of the broken stones is 70-80%, and the broken stones are spread in the initial setting process of the flexible epoxy mortar.
9. A paved steel bridge deck structure according to claim 5, wherein: the gravel particles on the surface of the flexible epoxy mortar are partially embedded into the mortar and partially embedded into the surface layer, preferably, the gravel with the depth of 1/3-1/2 is embedded into the flexible epoxy mortar, and the other part of the gravel is embedded into the surface layer.
10. A method of constructing a flexible epoxy mortar paving steel deck structure as claimed in claim 5, wherein: the construction steps are as follows:
(1) firstly, carrying out sand blasting and rust removal on the surface of a steel bridge deck steel plate;
(2) after the steel plate is subjected to sand blasting and rust removal, a steel plate anticorrosive coating is formed on the steel plate;
(3) uniformly spraying the flexible epoxy adhesive on the steel plate anticorrosive coating;
(4) after the epoxy adhesive on the steel plate is coated and dried, a first epoxy adhesive layer is obtained, flexible epoxy mortar is directly spread on the first epoxy adhesive layer, and the flexible epoxy mortar is self-compacted and molded;
(5) spreading broken stones in the initial setting process of the flexible epoxy mortar, and ensuring that the broken stones are partially embedded into the flexible epoxy mortar;
(6) uniformly coating an epoxy adhesive on the substrate;
(7) and finally, the paved surface layer is subjected to a curing reaction on the second epoxy bonding layer under a high-temperature condition, so that the surface layer and the flexible epoxy mortar are effectively bonded.
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