CN1776097A - Composite material dowel steel for cement concrete road and its preparing method - Google Patents
Composite material dowel steel for cement concrete road and its preparing method Download PDFInfo
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- CN1776097A CN1776097A CN 200510101954 CN200510101954A CN1776097A CN 1776097 A CN1776097 A CN 1776097A CN 200510101954 CN200510101954 CN 200510101954 CN 200510101954 A CN200510101954 A CN 200510101954A CN 1776097 A CN1776097 A CN 1776097A
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Abstract
This invention discloses a compound material dowel bar for concrete road paving, which contains bar core and glass fiber reinforced plastics pipe made of wound fiber and resin and covered on bar core, the fiber content is 60-75 % and the resin content is 25-40 %. The section of dowel bar is round or ellipse. Said compound material dowel bar has fine erosion resistance, durability and associativity with concrete, capable of saving 30 % of cost than that of steel dowel bar.
Description
Technical field
The invention belongs to the highway construction field, relate in particular to a kind of composite material dowel bar that is used for cement concrete pavement and preparation method thereof.
Background technology
A large amount of cement pavement highway condition investigations finds that the destruction of existing cement pavement is main mode of failure with disconnected plate and faulting of slab ends.These pavement destructions in the vehicle ride quality, have shortened the application life on road surface greatly on having a strong impact on the road surface, make building with maintenance costs of road increase substantially.Given this, " the highway cement concrete pavement design specifications " of country promulgation version in 2003 is further emphasized the importance of load transfer device between the Cement Concrete Pavement Slab seam, spell out for all transverse joints of high-grade highway and all will install dowel bar additional, strengthened the dimensional requirement of dowel bar diameter simultaneously.New criteria makes the rolled steel dosage of cement concrete pavement sharply increase for improving these new requirements that quality increased of cement concrete pavement.In recent years, price of steel product is in rising trend always both at home and abroad, and particularly from the beginning of this year, international iron ore price more goes up and reaches more than 70%, and the further rise of price of steel product has become undisputable fact.The field of civil engineering that is closely related with steel all will be faced with the situation that significantly raises the cost.Therefore, composite product substitutes steel and is used for civil engineering and has huge commercial promise and economic benefit.
The almost global pavement design standard all design service life of regulation cement concrete pavement is not less than 30 years.Therefore, require the road surface dowel bar that extraordinary durability will be arranged.For a long time, because pavement joint leaks, make the serious corrosion of steel dowel bar; Another problem is, steel dowel bar case hardness is excessive, and under the wheel load effect, dowel bar and pavement concrete contact interface very easily damage, and causes dowel bar loosening, and finally causes dowel bar to lose efficacy, and the damage on road surface.The dowel bar made from composite material can effectively overcome this two problems.
Summary of the invention
The object of the present invention is to provide a kind of composite material dowel bar that is used for cement concrete pavement and preparation method thereof, substitute the conventional steel dowel bar, can save the highway construction cost, improve the pavement performance of dowel bar with composite material dowel bar of the present invention.
For rigidity and the intensity that increases the composite material dowel bar, reduce cost, composite material dowel bar of the present invention is designed to be made of two parts: excellent core and glass reinforced plastic pipe, glass reinforced plastic pipe is enclosed within on the excellent core, glass reinforced plastic pipe is formed by fiber and Resin Wound, fiber volume fraction is 60～75%, and the resin volume content is 25～40%.
According to the needs that use, the section of composite material dowel bar of the present invention can be done circular or oval.
The preparation method of composite material dowel bar of the present invention has two kinds.
First kind of preparation method (winding method) is as follows:
(1) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.3～0.45, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 42～52%; The flyash consumption is 10～25% of an initial calculation cement consumption, water reducing agent is 0.5～3% of an initial calculation cement consumption, defoamer is 0.1 of initial calculation cement consumption～5 ‰, final cement consumption deducts the cement consumption that flyash replaces for the initial calculation cement consumption, and Water Usage Per Unit Volume is 180～210Kg/m
3, coarse aggregate content is 850～950Kg/m
3Moisture is become two parts, and a copy of it is 80～90%, mixes water reducing agent; Portion is 10～20% in addition, mixes defoamer, fully uniform mixing;
(2) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (1) is added slowly, all reinforced time is 100～140 seconds;
(3) after whole the adding, continued to mix and stir 50～70 seconds, the water that mixes defoamer in the step (1) was added in 10 seconds, mixed and stirred again 30～40 seconds;
(4) cement concrete is packed in the mould, the mould that cement concrete is housed is placed on shakes 50～80 seconds on the bumper;
(5) sealed maintenance is 3～10 days, the demoulding, utilize fiber and resin the coagulating cement core to be twined by system lining machine, curing station, winding machine and finisher, fiber volume fraction is 60～75%, the resin volume content is 25～40%, winding angle is 45 °～65 °, and winding thickness is 3～10mm;
(6) twine the back sealed maintenance got final product in 28 days.
Mould is circular or oval in the described step (4), and internal diameter is 5 ± 2cm when circular, and major axis is 5 ± 1cm when oval, and minor axis is 3.5 ± 0.5cm.
Second kind of preparation method (casting method) is as follows:
(1) utilize system lining machine, curing station, winding machine, finisher fiber to be become glass reinforced plastic pipe with resins with ingot stripper, wherein fiber volume fraction is 60～75%, the resin volume content is 25～40%, and winding angle is 45 °～65 °, and winding thickness is 3～10mm;
(2) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.3～0.45, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 42～52%; Flyash is 10～25% of initial calculation cement consumption, expansion agent is 8～12% of an initial calculation cement consumption, water reducing agent is 0.5～3% of an initial calculation cement consumption, defoamer is 0.1 of initial calculation cement consumption～5 ‰, final cement consumption deducts the cement consumption that flyash, expansion agent replace for the initial calculation cement consumption, and Water Usage Per Unit Volume is 180～210Kg/m
3, coarse aggregate content is 850～950Kg/m
3Moisture is become two parts, and a copy of it is 80～90%, mixes water reducing agent; Portion is 10～20% in addition, mixes defoamer, fully uniform mixing;
(3) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash and expansion agent, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (2) is added slowly, all reinforced time is 100～140 seconds;
(4) after whole the adding, continued to mix and stir 50～70 seconds, the water that mixes defoamer in the step (2) was added in 10 seconds, mixed and stirred again 30～40 seconds;
(5) cement concrete is packed in the glass reinforced plastic pipe, the glass reinforced plastic pipe that cement concrete is housed is placed on shakes 50～80 seconds on the bumper;
(6) sealed maintenance is 28 days.
Glass reinforced plastic pipe is circular or oval in the described step (5), and internal diameter is 5 ± 2cm when circular, and major axis is 5 ± 1cm when oval, and minor axis is 3.5 ± 0.5cm.
The present invention has following advantage and beneficial effect:
(1) compare the steel dowel bar, the resistant tarnishing of composite material dowel bar of the present invention after rainwater is invaded road structure is better, has better durability;
(2) because steel dowel bar surface rigidity is excessive, the damage that the driving effect causes dowel bar and pavement concrete to contact on the surface easily, and then cause dowel bar to lose efficacy, and composite material dowel bar of the present invention can effectively overcome this problem, and better with concrete associativity;
(3) use composite material dowel bar of the present invention to have higher economical efficiency, can save about 30% cost, have huge commercial promise and economic benefit compared with the steel dowel bar;
(4) preparation method of the present invention is simple, and is less demanding to preparation equipment, is fit to suitability for industrialized production.
Description of drawings
Fig. 1 is the schematic diagram that composite material dowel bar of the present invention is used for load transfer system between Cement Concrete Pavement Slab;
Fig. 2 is the circular cross section schematic diagram of composite material dowel bar of the present invention;
Fig. 3 is the elliptical section schematic diagram of composite material dowel bar of the present invention.
Among the figure: transverse joint 3-1 is that glass reinforced plastic pipe 3-2 is excellent core between 1-wheel load 2-Cement Concrete Pavement Slab 3-composite material dowel bar 4-plate
The specific embodiment
In order to understand the present invention better, the present invention is done to describe further below in conjunction with accompanying drawing.
Shown in Fig. 2 and 3, composite material dowel bar of the present invention is made of two parts: excellent core 3-2 and glass reinforced plastic pipe 3-1, glass reinforced plastic pipe 3-1 are enclosed within on the excellent core 3-2, and glass reinforced plastic pipe is formed by fiber and Resin Wound, fiber volume fraction is 60～75%, and the resin volume content is 25～40%.According to the needs that use, the section of composite material dowel bar can be done circular or oval.
As shown in Figure 1; when wheel load 1 acts on wherein a Cement Concrete Pavement Slab 2 near transverse joint 4 places between plate; composite material dowel bar 3 is delivered to a part of wheel load 1 on the adjacent Cement Concrete Pavement Slab 2; reduce the distortion of the Cement Concrete Pavement Slab 2 of directly bearing wheel load 1 and the tensile stress of plate bottom; make adjacent two boards compatibility of deformation, help the protection of Cement Concrete Pavement Slab 2.
The example that is equipped with the composite material dowel bar with the winding legal system is as follows:
Embodiment 1
(1) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.45, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 52%; The flyash consumption is 25% of an initial calculation cement consumption, water reducing agent is 0.5% of an initial calculation cement consumption, defoamer is 0.1 ‰ of an initial calculation cement consumption, and final cement consumption deducts the cement consumption that flyash replaces for the initial calculation cement consumption, and Water Usage Per Unit Volume is 210Kg/m
3, coarse aggregate content is 850Kg/m
3Moisture is become two parts, and a copy of it is 80%, mixes water reducing agent; Portion is 20% in addition, mixes defoamer, fully uniform mixing;
(2) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (1) is added slowly, all reinforced time is 100 seconds;
(3) after whole the adding, continued to mix and stir 50 seconds, the water that mixes defoamer in the step (1) was added in 10 seconds, mixed and stirred again 30 seconds;
(4) cement concrete is packed into major axis is that 5cm, minor axis are in the oval mould of 3.5cm, and the circular die that cement concrete is housed was placed on the bumper vibrations 50 seconds;
(5) sealed maintenance is 3 days, and the demoulding utilizes fiber and resin by system lining machine, curing station, winding machine and finisher the coagulating cement core to be twined, and fiber volume fraction is 75%, and the resin volume content is 25%, and winding angle is 65 °, and winding thickness is 3mm;
(6) twine the back sealed maintenance got final product in 28 days.
Embodiment 2
(1) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.37, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 46%; The flyash consumption is 15% of an initial calculation cement consumption, water reducing agent is 2% of an initial calculation cement consumption, defoamer is 3 ‰ of an initial calculation cement consumption, and final cement consumption deducts the cement consumption that flyash replaces for the initial calculation cement consumption, and Water Usage Per Unit Volume is 190Kg/m
3, coarse aggregate content is 880Kg/m
3Moisture is become two parts, and a copy of it is 85%, mixes water reducing agent; Portion is 15% in addition, mixes defoamer, fully uniform mixing;
(2) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (1) is added slowly, all reinforced time is 120 seconds;
(3) after whole the adding, continued to mix and stir 60 seconds, the water that mixes defoamer in the step (1) was added in 10 seconds, mixed and stirred again 35 seconds;
(4) cement concrete is packed into internal diameter is in the circular die of 5cm, and the oval mould that cement concrete is housed was placed on the bumper vibrations 70 seconds;
(5) sealed maintenance is 7 days, and the demoulding utilizes fiber and resin by system lining machine, curing station, winding machine and finisher the coagulating cement core to be twined, and fiber volume fraction is 68%, and the resin volume content is 32%, and winding angle is 52 °, and winding thickness is 6mm;
(6) twine the back sealed maintenance got final product in 28 days.
Embodiment 3
(1) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.3, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 42%; The flyash consumption is 10% of an initial calculation cement consumption, water reducing agent is 3% of an initial calculation cement consumption, defoamer is 5 ‰ of an initial calculation cement consumption, and final cement consumption deducts the cement consumption that flyash replaces for the initial calculation cement consumption, and Water Usage Per Unit Volume is 180Kg/m
3, coarse aggregate content is 950Kg/m
3Moisture is become two parts, and a copy of it is 90%, mixes water reducing agent; Portion is 10% in addition, mixes defoamer, fully uniform mixing;
(2) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (1) is added slowly, all reinforced time is 140 seconds;
(3) after whole the adding, continued to mix and stir 70 seconds, the water that mixes defoamer in the step (1) was added in 10 seconds, mixed and stirred again 40 seconds;
(4) cement concrete is packed into internal diameter is in the circular die of 7cm, and the mould that cement concrete is housed was placed on the bumper vibrations 80 seconds;
(5) sealed maintenance is 10 days, and the demoulding utilizes fiber and resin by system lining machine, curing station, winding machine and finisher the coagulating cement core to be twined, fiber volume fraction is 60%, the resin volume content is 40%, and winding angle is 45 °, and winding thickness is 10mm;
(6) twine the back sealed maintenance got final product in 28 days.
The example for preparing the composite material dowel bar with casting method is as follows:
Embodiment 4
(1) utilize system lining machine, curing station, winding machine, finisher to become major axis to be 5cm with resins fiber with ingot stripper, minor axis is the oval glass reinforced plastic pipe of 3.5cm, and wherein fiber volume fraction is 75%, and the resin volume content is 25%, winding angle is 65 °, and winding thickness is 3mm;
(2) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.45, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 52%; Flyash is 25% of initial calculation cement consumption, expansion agent is 12% of an initial calculation cement consumption, water reducing agent is 0.5% of an initial calculation cement consumption, defoamer is 0.1 ‰ of an initial calculation cement consumption, final cement consumption deducts the cement consumption that flyash, expansion agent replace for the initial calculation cement consumption, and Water Usage Per Unit Volume is 210Kg/m
3, coarse aggregate content is 850Kg/m
3Moisture is become two parts, and a copy of it is 80%, mixes water reducing agent; Portion is 20% in addition, mixes defoamer, fully uniform mixing;
(3) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash and expansion agent, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (2) is added slowly, all reinforced time is 100 seconds;
(4) after whole the adding, continued to mix and stir 50 seconds, the water that mixes defoamer in the step (2) was added in 10 seconds, mixed and stirred again 30 seconds;
(5) cement concrete is packed into major axis is that 4cm, minor axis are in the oval glass reinforced plastic pipe of 3cm, and the oval glass reinforced plastic pipe that cement concrete is housed was placed on the bumper vibrations 50 seconds;
(6) sealed maintenance is 28 days.
Embodiment 5
(1) utilize system lining machine, curing station, winding machine, finisher with ingot stripper fiber to be become the circular glass steel pipe of internal diameter for 5cm with resins, wherein fiber volume fraction is 68%, and the resin volume content is 32%, and winding angle is 52 °, and winding thickness is 6mm;
(2) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.37, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 46%; Flyash is 15% of initial calculation cement consumption, expansion agent is 9% of an initial calculation cement consumption, water reducing agent is 2% of an initial calculation cement consumption, defoamer is 3 ‰ of an initial calculation cement consumption, final cement consumption deducts the cement consumption that flyash, expansion agent replace for the initial calculation cement consumption, and Water Usage Per Unit Volume is 190Kg/m
3, coarse aggregate content is 880Kg/m
3Moisture is become two parts, and a copy of it is 85%, mixes water reducing agent; Portion is 15% in addition, mixes defoamer, fully uniform mixing;
(3) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash and expansion agent, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (2) is added slowly, all reinforced time is 120 seconds;
(4) after whole the adding, continued to mix and stir 60 seconds, the water that mixes defoamer in the step (2) was added in 10 seconds, mixed and stirred again 35 seconds;
(5) cement concrete is packed in the circular glass steel pipe, the circular glass steel pipe that cement concrete is housed was placed on the bumper vibrations 70 seconds;
(6) sealed maintenance is 28 days.
Embodiment 6
(1) utilize system lining machine, curing station, winding machine, finisher fiber to be become the circular glass steel pipe of internal diameter for 3cm with resins with ingot stripper, wherein fiber volume fraction is 60%, the resin volume content is 40%, and winding angle is 45 °, and winding thickness is 10mm;
(2) weigh up various raw material by design mixture proportion, water/binder ratio (water consumption/initial calculation cement consumption) is 0.3, and sand coarse aggregate ratio (fine aggregate/(fine aggregate+coarse aggregate)) is 42%; Flyash is 10% of initial calculation cement consumption, expansion agent is 8% of an initial calculation cement consumption, water reducing agent is 3% of an initial calculation cement consumption, defoamer is 5 ‰ of an initial calculation cement consumption, final cement consumption deducts the cement consumption that flyash, expansion agent replace for the initial calculation cement consumption, and Water Usage Per Unit Volume is 180Kg/m
3, coarse aggregate content is 950Kg/m
3Moisture is become two parts, and a copy of it is 90%, mixes water reducing agent; Portion is 10% in addition, mixes defoamer, fully uniform mixing;
(3) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash and expansion agent, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (2) is added slowly, all reinforced time is 140 seconds;
(4) after whole the adding, continued to mix and stir 70 seconds, the water that mixes defoamer in the step (2) was added in 10 seconds, mixed and stirred again 40 seconds;
(5) cement concrete is packed in the glass reinforced plastic pipe, the glass reinforced plastic pipe that cement concrete is housed was placed on the bumper vibrations 80 seconds;
(6) sealed maintenance is 28 days.
Claims (9)
1. composite material dowel bar that is used for cement concrete pavement, be made of excellent core and glass reinforced plastic pipe two parts, glass reinforced plastic pipe is enclosed within on the excellent core, it is characterized in that glass reinforced plastic pipe is formed by fiber and Resin Wound, fiber volume fraction is 60～75%, and the resin volume content is 25～40%.
2. the composite material dowel bar that is used for cement concrete pavement according to claim 1, the section that it is characterized in that the composite material dowel bar is for circular.
3. the composite material dowel bar that is used for cement concrete pavement according to claim 1, the section that it is characterized in that the composite material dowel bar is for oval.
4. the composite material dowel bar that is used for cement concrete pavement according to claim 1 is characterized in that the preparation method is as follows:
(1) weigh up various raw material by design mixture proportion, water/binder ratio is 0.3～0.45, and sand coarse aggregate ratio is 42～52%; The flyash consumption is 10～25% of an initial calculation cement consumption, water reducing agent is 0.5～3% of an initial calculation cement consumption, defoamer is 0.1 of initial calculation cement consumption～5 ‰, final cement consumption deducts the cement consumption that flyash replaces for the initial calculation cement consumption, and Water Usage Per Unit Volume is 180～210Kg/m
3, coarse aggregate content is 850～950Kg/m
3Moisture is become two parts, and a copy of it is 80～90%, mixes water reducing agent; Portion is 10～20% in addition, mixes defoamer, fully uniform mixing;
Described water/binder ratio is a water consumption and the ratio of initial calculation cement consumption;
Described sand coarse aggregate ratio is a fine aggregate and the ratio of fine aggregate and coarse aggregate sum;
(2) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (1) is added slowly, all reinforced time is 100～140 seconds;
(3) after whole the adding, continued to mix and stir 50～70 seconds, the water that mixes defoamer in the step (1) was added in 10 seconds, mixed and stirred again 30～40 seconds;
(4) cement concrete is packed in the mould, the mould that cement concrete is housed is placed on shakes 50～80 seconds on the bumper;
(5) sealed maintenance is 3～10 days, the demoulding, utilize fiber and resin the coagulating cement core to be twined by system lining machine, curing station, winding machine and finisher, fiber volume fraction is 60～75%, the resin volume content is 25～40%, winding angle is 45 °～65 °, and winding thickness is 3～10mm;
(6) twine the back sealed maintenance got final product in 28 days.
5. the composite material dowel bar that is used for cement concrete pavement according to claim 4 is characterized in that mould is for circular in the described step (4), and internal diameter is 5 ± 2cm.
6. the composite material dowel bar that is used for cement concrete pavement according to claim 4 is characterized in that mould is for oval in the described step (4), and major axis is 5 ± 1cm, and minor axis is 3.5 ± 0.5cm.
7. the composite material dowel bar that is used for cement concrete pavement according to claim 1 is characterized in that the preparation method is as follows:
(1) utilize system lining machine, curing station, winding machine, finisher fiber to be become glass reinforced plastic pipe with resins with ingot stripper, wherein fiber volume fraction is 60～75%, the resin volume content is 25～40%, and winding angle is 45 °～65 °, and winding thickness is 3～10mm;
(2) weigh up various raw material by design mixture proportion, water/binder ratio is 0.3～0.45, and sand coarse aggregate ratio is 42～52%; Flyash is 10～25% of initial calculation cement consumption, expansion agent is 8～12% of an initial calculation cement consumption, water reducing agent is 0.5～3% of an initial calculation cement consumption, defoamer is 0.1 of initial calculation cement consumption～5 ‰, final cement consumption deducts the cement consumption that flyash, expansion agent replace for the initial calculation cement consumption, and Water Usage Per Unit Volume is 180～210Kg/m
3, coarse aggregate content is 850～950Kg/m
3Moisture is become two parts, and a copy of it is 80～90%, mixes water reducing agent; Portion is 10～20% in addition, mixes defoamer, fully uniform mixing;
Described water/binder ratio is a water consumption and the ratio of initial calculation cement consumption;
Described sand coarse aggregate ratio is a fine aggregate and the ratio of fine aggregate and coarse aggregate sum;
(3) in the coagulating cement soil mixing plant, be sequentially added into coarse aggregate, fine aggregate, cement, flyash and expansion agent, start the lorry mounted mixer motor, with the material uniform mixing, in whipping process, the water that mixes water reducing agent in the step (2) is added slowly, all reinforced time is 100～140 seconds;
(4) after whole the adding, continued to mix and stir 50～70 seconds, the water that mixes defoamer in the step (2) was added in 10 seconds, mixed and stirred again 30～40 seconds;
(5) cement concrete is packed in the glass reinforced plastic pipe, the glass reinforced plastic pipe that cement concrete is housed is placed on shakes 50～80 seconds on the bumper;
(6) sealed maintenance is 28 days.
8. the composite material dowel bar that is used for cement concrete pavement according to claim 7 is characterized in that glass reinforced plastic pipe is for circular in the described step (5), and internal diameter is 5 ± 2cm.
9. the composite material dowel bar that is used for cement concrete pavement according to claim 7 is characterized in that glass reinforced plastic pipe is for oval in the described step (5), and major axis is 5 ± 1cm, and minor axis is 3.5 ± 0.5cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101019542A CN100451238C (en) | 2005-12-09 | 2005-12-09 | Composite material dowel steel for cement concrete road and its preparing method |
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| CNB2005101019542A CN100451238C (en) | 2005-12-09 | 2005-12-09 | Composite material dowel steel for cement concrete road and its preparing method |
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| CN103628383A (en) * | 2013-09-17 | 2014-03-12 | 华南理工大学 | Solid-core composite material dowel bar for cement concrete pavements |
| CN103628382A (en) * | 2013-09-17 | 2014-03-12 | 华南理工大学 | Composite material pull rod used for cement concrete pavement |
| CN104452519A (en) * | 2014-12-02 | 2015-03-25 | 黑龙江省交通科学研究所 | Method for preventing structural damage of cold-region highway concrete pavement |
| CN104612018A (en) * | 2014-12-25 | 2015-05-13 | 东南大学 | Dowel bar with combined structure for cement concrete pavements and durable stitch contracting structure |
| CN105229233A (en) * | 2012-02-04 | 2016-01-06 | 复合钢筋技术公司 | Multipart, composite highway dowel bar structure and manufacture method |
| CN113622244A (en) * | 2021-07-06 | 2021-11-09 | 中铁第四勘察设计院集团有限公司 | Precast concrete panel, connection structure of precast concrete panels, and installation method of precast concrete panels |
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| CN105229233A (en) * | 2012-02-04 | 2016-01-06 | 复合钢筋技术公司 | Multipart, composite highway dowel bar structure and manufacture method |
| US10508390B2 (en) | 2012-02-04 | 2019-12-17 | Composite Rebar Technologies, Inc. | Plural-component, composite-material highway dowel bar fabrication methodology |
| CN103628383A (en) * | 2013-09-17 | 2014-03-12 | 华南理工大学 | Solid-core composite material dowel bar for cement concrete pavements |
| CN103628382A (en) * | 2013-09-17 | 2014-03-12 | 华南理工大学 | Composite material pull rod used for cement concrete pavement |
| CN104452519A (en) * | 2014-12-02 | 2015-03-25 | 黑龙江省交通科学研究所 | Method for preventing structural damage of cold-region highway concrete pavement |
| CN104612018A (en) * | 2014-12-25 | 2015-05-13 | 东南大学 | Dowel bar with combined structure for cement concrete pavements and durable stitch contracting structure |
| CN104612018B (en) * | 2014-12-25 | 2016-06-08 | 东南大学 | A kind of cement concrete pavement combinative structure dowel steel and permanent seal cooling contracting crack structure |
| CN113622244A (en) * | 2021-07-06 | 2021-11-09 | 中铁第四勘察设计院集团有限公司 | Precast concrete panel, connection structure of precast concrete panels, and installation method of precast concrete panels |
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| CN100451238C (en) | 2009-01-14 |
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