CN112411372A - Thin-layer epoxy polymer concrete suitable for steel box girder bridge floor and preparation method thereof - Google Patents
Thin-layer epoxy polymer concrete suitable for steel box girder bridge floor and preparation method thereof Download PDFInfo
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- CN112411372A CN112411372A CN202011335411.8A CN202011335411A CN112411372A CN 112411372 A CN112411372 A CN 112411372A CN 202011335411 A CN202011335411 A CN 202011335411A CN 112411372 A CN112411372 A CN 112411372A
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- polymer concrete
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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
- E01D19/125—Grating or flooring for bridges
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
-
- 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
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
- E01C19/4826—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing the materials being aggregate mixed with binders
-
- 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
Abstract
The invention discloses a thin-layer epoxy polymer concrete suitable for a steel box girder bridge floor, which consists of an epoxy component, a fiber material and a graded mineral aggregate. Also discloses a preparation method of the thin-layer epoxy polymer concrete suitable for the steel box girder bridge floor, which comprises the following steps: s01, adding the dry-graded mineral aggregate, adding the fiber material and mixing for 15-60S; s02, adding epoxy components, and stirring for 30-60S to pave; and S03, rolling by using a double-steel-wheel road roller after paving. The invention is suitable for thin epoxy polymer concrete of steel box girder bridge floor, adopts latent epoxy component, and promotes the thin epoxy polymer concrete to finish final curing through the temperature of the upper layer paved by anti-sliding and abrasion. Through the secondary curing mode, not only is the construction difficulty of the epoxy polymer concrete reduced, but also the bonding property of the epoxy polymer concrete and the paved upper layer is enhanced.
Description
Technical Field
The invention belongs to the technical field of materials used in bridge decks, and particularly relates to thin-layer epoxy polymer concrete suitable for steel box girder bridge decks and a preparation method thereof.
Background
The steel box girder bridge deck is welded and fixed on the orthotropic structural girder and the longitudinal ribs, and the steel bridge deck system has large flexibility and is easy to flex, the deformation and stress characteristics under the action of vehicle load and temperature load are very obviously different from those of a common cement concrete bridge, and the deformation and stress are also very obviously different at different parts of the same bridge, so that the pavement layer is required to have good road performance, high and low temperature stability, water stability and the like; in addition, the steel plate has good heat transfer performance, and is easy to deform and generate shearing force during construction at high temperature, so that the pavement layer is required to have good flexibility and deformation following capability; meanwhile, due to repeated deformation of the steel plate, the requirements on the adhesive force between the pavement layer and the steel plate and the anti-delamination are higher.
A great deal of research has been carried out on the pavement of steel bridge decks at home and abroad, and the pavement schemes of the steel bridge decks are various, so that the asphalt pavement used for the steel bridge decks mainly comprises cast asphalt concrete, epoxy modified asphalt concrete and asphalt mastic macadam (SMA). The three paving materials have great difference in material composition, performance and construction process. However, the thickness of the pavement layer of the three existing pavement materials is determined to be generally 60-80 mm by the performance characteristics, and for the bridge surface of the steel box girder, the constant load of the pavement layer greatly influences the bearing requirement of the steel box girder, so that if the thickness of the pavement layer can be reduced and the constant load can be reduced, the bearing requirement of the steel box girder can be reduced, and the steel box girder has excellent economic value.
Disclosure of Invention
The invention provides a polymer concrete with excellent road performance, good flexibility and deformation following ability and excellent bonding effect with a steel plate, and the thickness of the polymer concrete is only 15-25 mm. The overall thickness of the composite steel box girder is about 25-65 mm by matching with an anticorrosive layer, a bonding layer and a surface anti-skid wearing layer, so that the thickness of the overall paving layer can be reduced, the bearing requirement of the steel box girder is effectively reduced, and the composite steel box girder has excellent economic value.
The invention provides a thin-layer epoxy polymer concrete suitable for steel box girder bridge floors, which consists of an epoxy component, a fiber material and a graded mineral aggregate.
Preferably, the epoxy component is epoxy resin, and the proportion range of the epoxy component in the total mass of the thin epoxy polymer concrete is as follows: 6.5% -8.5%;
the epoxy resin is composed of a modified bisphenol A epoxy resin main agent added with a toughening agent, a curing agent and a diluent.
Preferably, the modified bisphenol A epoxy resin main agent added with the toughening agent is one or two of hydroxyl-terminated nitrile rubber and vinyl bis stearamide;
the mass ratio range of the toughening agent to the liquid bisphenol A type epoxy resin is as follows: 0:100 to 40: 60;
the toughening agent and the bisphenol A epoxy resin are premixed at the temperature of 100-120 ℃.
Preferably, the curing agent is a latent anhydride curing agent which mainly comprises an anhydride curing agent, super-coordination silicate or a curing agent and an accelerator;
the mass ratio range of the curing agent in the epoxy component is as follows: 10 to 50 percent.
Preferably, the thickness of the thin layer of epoxy polymer concrete is 15 mm-25 mm.
Preferably, the grading mineral aggregate ranges from 90% to 100% by mass through a 4.75mm mesh, from 35% to 65% by mass through a 2.36mm mesh and from 10% to 16% by mass through a 0.075mm mesh.
Preferably, the fiber material is one or more of polyester fiber, polyacrylonitrile fiber and basalt fiber.
Preferably, the fiber material accounts for 0.2-0.4% of the thin layer of epoxy polymer concrete by mass.
The invention also provides a production method of the thin-layer epoxy polymer concrete suitable for the steel box girder bridge floor, which comprises the following steps:
s01, adding the dry-graded mineral aggregate, adding the fiber material and mixing for 15-60S;
s02, adding epoxy components, and stirring for 30-60S to pave;
and S03, rolling by using a double-steel-wheel road roller after paving.
Preferably, the thin epoxy polymer concrete is used as a paving lower layer, after the thin epoxy polymer concrete is paved, a hot-mix asphalt concrete anti-skid wearing layer is paved within 7 days, the paving temperature is higher than 155 ℃, and the epoxy component is solidified when the thin epoxy polymer concrete is paved.
The invention has the following beneficial effects:
the thin epoxy polymer concrete suitable for the steel box girder bridge deck adopts the latent epoxy component, and the thin epoxy polymer concrete is promoted to finish final curing through the temperature of the upper layer paved by the anti-sliding wear. Through the secondary curing mode, not only is the construction difficulty of the epoxy polymer concrete reduced, but also the bonding property of the epoxy polymer concrete and the paved upper layer is enhanced.
The invention is suitable for thin-layer epoxy polymer concrete of a steel box girder bridge floor, adopts an epoxy component with better toughness, and enables the epoxy polymer concrete to have good flexibility and deformation adaptability through the application of the toughening agent. The epoxy polymer concrete has excellent bonding performance with materials such as epoxy paint or epoxy resin bonding layers sprayed on the steel box girder bridge surface, so that the pavement layer can be stably connected with the steel box girder bridge surface without generating diseases such as slippage, delamination and the like.
The thin epoxy polymer concrete is suitable for the thin epoxy polymer concrete of the steel box girder bridge deck, has material performance superior to that of common SMA asphalt concrete, pouring asphalt concrete and epoxy asphalt concrete for paving the steel box girder bridge deck, and has excellent physical and mechanical properties. And as the lower layer of the pavement, the epoxy component is slowly aged and can be used as the durable pavement for long-term service.
The thickness of the invention as a paving lower layer is only 15 mm-25 mm. The overall thickness of the pavement layer can be about 25-65 mm by matching with the anti-corrosion layer, the bonding layer and the surface anti-skid wearing layer, and compared with the pavement thickness of 60-80 mm of the conventional steel box girder bridge deck, the pavement layer is reduced by about half, so that the cost of the pavement layer is reduced, the constant load requirement of the bridge bearing is reduced, and the overall bridge structure cost can be reduced to a certain extent.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
The invention relates to a thin-layer epoxy polymer concrete suitable for a steel box girder bridge floor, which consists of an epoxy component, a fiber material and a graded mineral aggregate. Wherein the epoxy component is epoxy resin, and the proportion range of the epoxy component in the total mass of the thin-layer epoxy polymer concrete is as follows: 6.5% -8.5%; the epoxy resin is composed of a modified bisphenol A epoxy resin main agent added with a toughening agent, a curing agent and a diluent. The toughening agent is one or two of hydroxyl-terminated nitrile rubber and vinyl bis stearamide; the curing agent is latent anhydride curing agent, which mainly comprises anhydride curing agent, super-coordination silicate, or curing agent and accelerant; the fiber material is one or more of polyester fiber, polyacrylonitrile fiber and basalt fiber.
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to the following examples.
Example 1: the main application is laboratory or small field processing.
E-44 type bisphenol A epoxy resin and a hydroxyl-terminated butadiene-acrylonitrile rubber toughening agent are selected, and are uniformly premixed after being heated to 100 ℃ according to a ratio of 25:75 (the toughening agent: the epoxy resin).
Adding a mixed curing agent of methyl hexahydrophthalic anhydride and trimellitic anhydride into benzyl dimethylamine phenyl silicate, wherein the ratio of the curing agent to the silicate is 99.5:0.5, and adding a diluent accounting for 5% of the total mass of the curing agent and the silicate at normal temperature to uniformly mix for later use.
Basalt coarse aggregates (2.36 mm-4.75 mm), limestone fine aggregates (0-2.36 mm), ground limestone filler and cement are selected to form the aggregate part according to the requirements of graded mineral aggregate (the mass percentage of the aggregate part passing through a 4.75mm sieve pore is 91 percent, the mass percentage of the aggregate part passing through a 2.36mm sieve pore is 38 percent, and the mass percentage of the aggregate part passing through a 0.075mm sieve pore is 12 percent).
(total mass 1000 parts) adding 919.5 parts of the dried graded mineral aggregate into 2.5 parts of polyester fiber (accounting for 0.25% of the mass of the mixture), and dry-stirring in a stirrer for 1 min; adding 62.4 parts of diluted epoxy resin main agent (containing toughening agent), and stirring in a stirrer for 1 min; adding 15.6 parts of diluted curing agent, stirring for 40s to prepare a sample, molding, and heating for curing.
Example 2: the method is mainly applied to large-scale mixing plant production and large-scale application.
E-51 type bisphenol A epoxy resin is selected, 20% of diluent is added, hydroxyl-terminated nitrile butadiene rubber toughening agent is mixed according to the proportion of 30:70 (toughening agent: epoxy resin), after the mixture is heated to 120 ℃, the mixture is premixed uniformly and cooled to normal temperature.
Adding methyl hexahydrophthalic anhydride curing agent into benzyl dimethylamine phenyl silicate, wherein the ratio of the curing agent to the silicate is 99.9:0.1, adding diluent accounting for 5 percent of the total mass of the curing agent and the silicate at normal temperature, and uniformly mixing for later use.
Basalt coarse aggregates (2.36 mm-4.75 mm), limestone fine aggregates (0-2.36 mm) and ground limestone filler are selected to form an aggregate part according to the requirements of graded mineral aggregates (the mass percentage of the aggregate part passing through a 4.75mm sieve pore is 93 percent, the mass percentage of the aggregate part passing through a 2.36mm sieve pore is 42 percent, and the mass percentage of the aggregate part passing through a 0.075mm sieve pore is 15 percent).
(total mass 1000 parts) heating 910 parts of the graded mineral aggregate to 105 ℃ and drying, adding polyester fiber (namely 3 parts) accounting for 0.3% of the mass of the mixture, and dry-mixing for 15s in a large mixing plant; adding 60.9 parts of diluted epoxy resin main agent (containing toughening agent) and mixing for 35 seconds in a large mixing plant; and adding 26.1 parts of diluted curing agent, and stirring for 30 seconds to pave.
Example 3: the actual construction of example 2 is exemplified.
And (3) carrying out sand blasting and rust removal on the bridge surface of the steel box girder, spraying an epoxy zinc-rich paint anticorrosive layer, then brushing a modified epoxy resin bonding layer, and then paving the thin epoxy polymer concrete shown in the embodiment 2 by using a paver. And after paving, rolling by using a double-steel-wheel road roller.
And after the thin epoxy polymer concrete is paved, paving the hot-mix asphalt concrete anti-skid wearing layer within 7d, wherein the paving temperature is more than 155 ℃, and accelerating the solidification of the epoxy component for paving the thin epoxy polymer concrete.
Comparative example 1
Corresponding to the thin layer epoxy polymer concrete lower surface layer of this patent, the technical scheme that commonly uses has epoxy asphalt concrete, cast asphalt concrete, pitch mastic rubble (SMA), and the comparative example 1 selects epoxy asphalt concrete. The difference between epoxy asphalt concrete and the patent lies in: the epoxy asphalt concrete cementing material is mainly asphalt added with epoxy resin, while the epoxy asphalt concrete cementing material is polymer concrete, and the cementing material is mainly epoxy resin material and does not contain asphalt components.
The curing period of the epoxy asphalt concrete is generally 20-30 d, and the strength of the mixture is insufficient during the curing period, so that the traffic can not be opened or the next procedure can not be carried out.
Comparative example 2
And selecting pouring type asphalt concrete. The pouring type asphalt concrete adopts polymer modified asphalt or petroleum asphalt components added with lake asphalt. The method is carried out at a high temperature of more than 200 ℃, and the asphalt concrete flows automatically at the temperature without rolling.
The pouring type asphalt concrete is different from the patent in that: the pouring asphalt concrete adopts polymer modified asphalt which belongs to thermoplastic materials and can be softened at higher temperature.
The pouring type asphalt concrete adopts high-temperature construction, and the pouring type asphalt concrete is implemented at normal temperature or a temperature slightly higher than the normal temperature (below 100 ℃). The deformation influence of high temperature conditions on the steel box girder structure cannot be ignored. Meanwhile, the construction process of self-flowing cannot be implemented for certain bridge floors with large gradients.
Sampling the concrete in the examples 1, 2, 1 and 2, sampling and molding the concrete in the examples 1 and 2, and curing at 170 ℃ for 100 min; comparative example 1 samples were molded and then cured at 70 ℃ for 7 days. Indoor void ratio detection, rutting dynamic stability and low-temperature bending tests are carried out, and the test results are shown in table 1; the adhesion property to the steel sheet in example 2, comparative example 1, comparative example 2 was subjected to a drawing test and the like, and the test results are shown in table 2.
TABLE 1 dynamic stability and fly-away test results of the mixtures
As shown in table 1, examples 1 and 2 exhibited high and low temperature performance superior to those of comparative examples 1 and 2. Although the porosity of the example 1 and the example 2 is larger than that of the comparative example 2, the requirement of water impermeability is met.
TABLE 2 results of the drawing test
| Adhesive Strength (MPa) | |
| Example 1 | 2.3 |
| Example 3 | 2.9 |
| Comparative example 1 | 1.8 |
| Comparative example 2 | 0.9 |
As shown in table 2, the adhesive strength between example 1 and the steel sheet was higher than that between comparative examples 1 and 2. Of course, in actual use, the adhesive strength between the lower surface layer and the steel plate is mainly provided by the adhesive layer, so that the adhesive strength of example 3 is higher than that of example 1.
The test steel box girder bridge deck of the embodiment 3 is paved and then the vehicle is started, and the road surface detection is carried out after the vehicle is started for 6 months, so that the result shows that the pavement layer is complete in structure, and the pavement layer has no transition, no cracking and no rutting.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.
Claims (10)
1. A thin layer epoxy polymer concrete suitable for steel box girder bridge floor which characterized in that:
the thin-layer epoxy polymer concrete is composed of an epoxy component, a fiber material and a graded mineral aggregate.
2. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 1, wherein:
the epoxy component is epoxy resin, and the proportion range of the epoxy component in the total mass of the thin-layer epoxy polymer concrete is as follows: 6.5% -8.5%;
the epoxy resin is composed of a modified bisphenol A epoxy resin main agent added with a toughening agent, a curing agent and a diluent.
3. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 2, wherein:
the toughening agent is one or two of hydroxyl-terminated nitrile rubber and vinyl bis stearamide;
the mass ratio range of the toughening agent to the liquid bisphenol A type epoxy resin is as follows: 0:100 to 40: 60;
the toughening agent and the bisphenol A epoxy resin are premixed at the temperature of 100-120 ℃.
4. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 2, wherein:
the curing agent is a latent anhydride curing agent and mainly comprises an anhydride curing agent, super-coordination silicate or a curing agent and an accelerator;
the mass ratio range of the curing agent in the epoxy component is as follows: 10 to 50 percent.
5. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 1, wherein:
the thickness of the thin layer epoxy polymer concrete is 15 mm-25 mm.
6. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 1, wherein:
the mass percentage of the graded mineral aggregate passing through a 4.75mm sieve pore is 90-100%; the mass percentage of the filter screen passing through a 2.36mm sieve pore is 35-65%; the mass percentage of the filter screen which passes through the 0.075mm sieve hole is 10-16%.
7. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 1, wherein:
the fiber material is one or more of polyester fiber, polyacrylonitrile fiber and basalt fiber.
8. A thin layer of epoxy polymer concrete suitable for use in steel box beam bridge deck according to claim 1, wherein:
the fiber material accounts for 0.2-0.4% of the thin epoxy polymer concrete by mass.
9. A production method of thin-layer epoxy polymer concrete suitable for steel box girder bridge floors comprises the following steps:
s01, adding the dry-graded mineral aggregate, adding the fiber material and mixing for 15-60S;
s02, adding epoxy components, and stirring for 30-60S to pave;
and S03, rolling by using a double-steel-wheel road roller after paving.
10. A method for producing a thin layer epoxy polymer concrete suitable for steel box beam bridge deck according to claim 9 wherein:
the thin epoxy polymer concrete serves as a paving lower layer, after the thin epoxy polymer concrete is paved, a hot-mix asphalt concrete anti-skid wearing layer is paved within 7 days, the paving temperature is higher than 155 ℃, and the epoxy component is solidified when the thin epoxy polymer concrete is paved.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113980643A (en) * | 2021-12-17 | 2022-01-28 | 上海浦东路桥(集团)有限公司 | Asphalt waterproof bonding material and preparation method and construction process thereof |
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