CN102279254B - Research method for formulation of disease-free epoxy asphalt mixture for large-span steel bridge deck - Google Patents
Research method for formulation of disease-free epoxy asphalt mixture for large-span steel bridge deck Download PDFInfo
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Abstract
The invention relates to a research method for a formulation of a disease-free epoxy asphalt mixture for large-span steel bridge deck. The method comprises the following steps: pre-heating aggregate while respectively heating a component A and a component B of the American epoxy asphalt, and holding a certain temperature; then mixing the heated component A and the heated component B according to a certain ratio; adding the aggregate to the resulting mixture comprising the heated component A and the heated component B, carrying out stirring to obtain a mixed material; adding the stirred mixed material into a tray; placing the tray into a oven to carry out culturing for a certain time; adopting the cultured mixed material to prepare a Marshall specimen; culturing the Marshall specimen in the oven for a certain time; then determining the use amount of the asphalt and the asphalt aggregate ratio. According to the present invention, the researched epoxy asphalt mixture has less disease; the disadvantages of the traditional epoxy asphalt mixture are overcome; a certain foundation is established for the future research and development of the epoxy asphalt.
Description
Technical field
The present invention relates to a kind of research method of epoxy asphalt mixture, be specifically related to the research method of the disease-free epoxy asphalt mixture prescription of a kind of large-stride steel bridge deck, belong to the bituminous epoxy studying technological domain.
Background technology
Because having, orthotropic steel bridge deck saves steel, the easy prefabricated and advantage of installing, therefore aspect Large Span Bridges, use comparatively extensive, but its bridge floor flexibility is large, carry at traffic load, temperature variation, wind, under the natural cause joint effect such as earthquake, particularly be subject to the impact of bridge self structure distortion, its force and deformation situation is very complicated, if under the load action of heavy vehicle, its complicated stressing conditions is just more outstanding and unfavorable.Simultaneously, the summer temp of Steel Bridge Deck is high, and waterproof is antirust all to have determined that in conjunction with problem paving steel bridge deck has unique characteristics with interlayer.
Deck paving is technological difficulties during big-span steel bridge is built, its service condition and request for utilization are all far above pavement of road, development along with bridge technology, the Large scale construction of China's Large Span Bridges, the footpath of striding of Large Span Bridges is constantly being refreshed, the weight of main span steel case beam also has the trend of lightness, and this just need to have good steel deck paving package material to match with it.
At present, domestic paving steel bridge deck type citation form has: modified asphalt SMA, cast asphalt concrete, epoxy asphalt concrete, wherein modified asphalt SMA is used more at home, cast asphalt concrete is take the cast asphalt concrete of the pitch of Britain and Japan as representative, and epoxy asphalt concrete is most widely used in the U.S..
Along with building up successively of domestic each big-span steel bridge come into operation, the pavement performance of different pavement materials and structure and so on shows larger difference, the excellent performance that epoxy asphalt concrete is mated formation is paid much attention to gradually at home, its overall behaviour in service is better than cast asphalt and modified asphalt SMA etc. mats formation, and has become the pavement material of China's big-span steel bridge first-selection.Epoxy asphalt concrete is as a kind of high performance steel deck paving package material, the needs that adapted to preferably the bridge technology development, because bituminous epoxy is expensive, this technology is generally promoted at home and also has been subject to certain restriction, also has many tera incognitas to need us to continue to explore.Overall state is better than other material although epoxy asphalt concrete is mated formation, and still occurs at home many problems in the steel bridge, and these all receive domestic researcher's concern.
Summary of the invention
The purpose of this invention is to provide the research method that the disease-free epoxy asphalt mixture of a kind of large-stride steel bridge deck is filled a prescription, overcome the defective of traditional epoxy asphalt mixture, in order to address the above problem, the technical solution used in the present invention is:
1, disease-free (bubbling) epoxy asphalt mixture Formula Development
Determine best bitumen aggregate ratio by Marshall Test, and independently developed testing equipment, in controlled range, add macroporosity by adjusting with oil mass, advance the different porosities compound in testing laboratory of project management department and carry out " Mi Shui ventilation " property test, can reach the mixture gap rate of " Mi Shui ventilation " effect to find out.
2, mix-design
(1) material property
A. pitch
Component A be by bisphenol-A and chloropropylene oxide through the liquid bifunctional epoxy resin that reaction obtains, do not contain thinning agent, softening agent or plastifier.Do not contain inorganic filler, pigment or other pollutants or insoluble matter yet.Its technical indicator is shown in table 1-1.
B component is a kind of homogeneous complex that is comprised of petroleum bitumen and hardening agent.It does not contain insoluble material (such as inorganic filler or pigment etc.) and pollutant.Its technical indicator and requirement are shown in table 1-2.
B, gather materials
The special-purpose basaltic broken stone of the deck paving that adopts Zhenjiang, Jiangsu Jurong Mao Di Industrial Co., Ltd. to produce.Epoxy asphalt concrete satisfies the requirement of table 1-3,1-4 with aggregate quality.
Breeze adopts packed ls breeze, and its technical indicator satisfies the requirement of table 1-5.
(2), match ratio
A, each grade material preparation
Each feed bin screening result sees the following form:
Each feed bin density of material sees the following form
According to the material screening result of each grade material, in conjunction with requirement mineral aggregate formate gradation composition scope, as material 1#:2#:3#:4#:5#:6#: during breeze=2.5:22.5:20:22.5:24.5:4:4, formate gradation composition sees the following form.
B, test specimen are made
Epoxy asphalt mixture adopts common Marshall method for designing at mixing proportion design method, it is high a lot of that the more common Marshall technical indicator of its key technical indexes is wanted, although but key is to be to adopt same method for designing, its program of making test specimen is different.Domestic epoxy asphalt mixture production process is as follows:
(1) will gather materials and be placed in the baking oven more than 130-150 ℃ oven dry 6-10 hour;
(2) heat in advance U.S. bituminous epoxy A and B component, wherein component A is the liquid bifunctional epoxy resin that is obtained through reaction by bisphenol-A and chloropropylene oxide, B component is a kind of homogeneous complex that is comprised of petroleum bitumen and hardening agent: A is heated to 80-95 ℃, B is heated to 120-140 ℃, and remains this temperature;
(3) mould of marshal piece is put into 120 ℃ of baking oven heating 30-50 minute;
(4) A of heating and B component are poured into after mixing in proportion mixed and stirred in the used test glass of bituminous epoxy, and stirred 3-6 minute with glass bar, obtain the bituminous epoxy binder;
(5) gathering materials of will heating and be incubated drops in the agitated kettle, simultaneously the bituminous epoxy binder after stirring taken by weighing needed amount and puts in the agitated kettle, mixes and stirs 1-3 minute, obtains mixture;
(6) take by weighing the breeze that heated and put into mixture the inside after mixing and stirring, continue to stir 1-3 minute again, make epoxy asphalt mixture, the target temperature of compound is 120 ℃;
(7) epoxy asphalt mixture that mixes and stirs is contained in the pot in the pallet of testing usefulness from mixing and stirring, measured the asphalt that mixes and stirs, make its temperature reach 120 ℃;
(8) epoxy asphalt mixture in the pallet was put in 120 ℃ the baking oven health 30～40 minutes, conditioned time is from mixing and stirring the Time Calculation of mixing and stirring beginning in the pot;
(9) after the health, take out two-sided the hitting real each 50 times of asphalt in the pallet, make as early as possible marshal piece;
(10) marshal piece that makes was put in 120 ℃ of baking ovens health 6 hours;
(11) test specimen after the health cools off rear bulk density at normal temperatures, carries out stability test, determines asphalt content and bitumen aggregate ratio by the relation of density, voidage, degree of stability and flow valuve and pitch saturation degree;
The process of the test of wherein measuring voidage is as follows:
Pallet is used in the A test, and specification is 300mm * 300mm * 55mm, even trowelling sticking layer oil after the processing of rust removing, and 150mm * 150mm trowelling vegetable oil is reserved so that boring and coring in the position in the dish;
Drip rear Accelerated Life compound in the middle of the B pallet;
C measures the effect that different voidage compounds roll rear test specimen;
D solidifies rear 60 ℃ of constant temperature ovens, " bubbling " effect behind the mensuration 24h;
E measures the rear effect of " bubbling " venting;
F gets without " bubbling " test specimen and does water penetration test;
G gets core and surveys effective porosity.
[0013]The invention has the beneficial effects as follows: the best bitumen aggregate ratio of determining epoxy asphalt mixture by Marshall Test, under this ratio, in controlled range, add macroporosity by adjusting with oil mass, the prescription of mixed materials of determining by the method can reach " Mi Shui ventilation " effect, overcome the unreasonable and defective of the multiple bad engineering problem that produces of ratio in the present work progress, and can reach the purpose of labor and material saving, save construction cost.
Embodiment
The present invention the present invention is described in further detail below by embodiment in order to illustrate better, these implement only to be used for illustrating the present invention, do not limit the scope of the invention.
Embodiment 1
1, disease-free (bubbling) epoxy asphalt mixture Formula Development
Determine best bitumen aggregate ratio by Marshall Test, and independently developed testing equipment, in controlled range, add macroporosity by adjusting with oil mass, advance the different porosities compound in testing laboratory of project management department and carry out " Mi Shui ventilation " property test, can reach the mixture gap rate of " Mi Shui ventilation " effect to find out.
2, mix-design
(1) material property
A. pitch
Component A be by bisphenol-A and chloropropylene oxide through the liquid bifunctional epoxy resin that reaction obtains, do not contain thinning agent, softening agent or plastifier.Do not contain inorganic filler, pigment or other pollutants or insoluble matter yet.Its technical indicator is shown in table 1-1.
B component is a kind of homogeneous complex that is comprised of petroleum bitumen and hardening agent.It does not contain insoluble material (such as inorganic filler or pigment etc.) and pollutant.Its technical indicator and requirement are shown in table 1-2.
B, gather materials
The special-purpose basaltic broken stone of the deck paving that adopts Zhenjiang, Jiangsu Jurong Mao Di Industrial Co., Ltd. to produce.Epoxy asphalt concrete satisfies the requirement of table 1-3,1-4 with aggregate quality.
Breeze adopts packed ls breeze, and its technical indicator satisfies the requirement of table 1-5.
(2), match ratio
A, each grade material preparation
Each feed bin screening result sees the following form:
Each feed bin density of material sees the following form
According to the material screening result of each grade material, in conjunction with requirement mineral aggregate formate gradation composition scope, as material 1#:2#:3#:4#:5#:6#: during breeze=2.5:22.5:20:22.5:24.5:4:4, formate gradation composition sees the following form.
B, test specimen are made
Epoxy asphalt mixture adopts common Marshall method for designing at mixing proportion design method, it is high a lot of that the more common Marshall technical indicator of its key technical indexes is wanted, although but key is to be to adopt same method for designing, its program of making test specimen is different.Domestic epoxy asphalt mixture production process is as follows:
(1) will gather materials and be placed in the baking oven more than 130-150 ℃ oven dry 6-10 hour;
(2) heat in advance U.S. bituminous epoxy A and B component: A is heated to 80-95 ℃, and B is heated to 120-140 ℃, and remains this temperature;
(3) mould of marshal piece is put into 120 ℃ of baking oven heating 30-50 minute;
(4) A of heating and B component are poured into after mixing in proportion mixed and stirred in the used test glass of bituminous epoxy, and stirred 3-6 minute with glass bar, obtain the bituminous epoxy binder;
(5) gathering materials of will heating and be incubated drops in the agitated kettle, simultaneously the bituminous epoxy binder after stirring taken by weighing needed amount and puts in the agitated kettle, mixes and stirs 1-3 minute, obtains mixture;
(6) take by weighing the breeze that heated and put into mixture the inside after mixing and stirring, continue to stir 1-3 minute again, make epoxy asphalt mixture, the target temperature of compound is 120 ℃;
(7) epoxy asphalt mixture that mixes and stirs is contained in the pot in the pallet of testing usefulness from mixing and stirring, measured the asphalt that mixes and stirs, make its temperature reach 120 ℃;
(8) epoxy asphalt mixture in the pallet was put in 120 ℃ the baking oven health 30～40 minutes, conditioned time is from mixing and stirring the Time Calculation of mixing and stirring beginning in the pot;
(9) after the health, take out two-sided the hitting real each 50 times of asphalt in the pallet, make as early as possible marshal piece;
(10) marshal piece that makes was put in 120 ℃ of baking ovens health 6 hours;
(11) test specimen after the health cools off rear bulk density at normal temperatures, carries out stability test, namely determines asphalt content by the relation of density, voidage, degree of stability and flow valuve and pitch saturation degree according to China's specification recommends method.
C, experimental result
The result is as follows through Marshall Test:
| Bitumen aggregate ratio | Maximum theory density | Bulk density | Voidage | Degree of stability | Flow valuve | VMA | VFA |
| (%) | (g/cm 3) | (g/cm 3) | (%) | (KN) | (mm -1) | (%) | (%) |
| 5.0 | 2.694 | 2.518 | 6.5 | 36.29 | 25.1 | 17.1 | 61.8 |
| 5.5 | 2.673 | 2.537 | 5.1 | 45.38 | 25.9 | 16.8 | 69.8 |
| 5.6 | 2.69 | 2.54 | 4.8 | 46.78 | 26.2 | 16.8 | 71.3 |
| 5.7 | 2.665 | 2.54 | 4.5 | 48.03 | 26.5 | 16.8 | 73.0 |
| 5.8 | 2.661 | 2.546 | 4.3 | 49.52 | 26.8 | 16.8 | 74.3 |
| 5.9 | 2.657 | 2.551 | 4.0 | 50.45 | 27.3 | 16.7 | 76.2 |
| 6.0 | 2.653 | 2.554 | 3.7 | 51.67 | 27.8 | 16.7 | 77.7 |
| 6.1 | 2.649 | 2.557 | 3.5 | 52.57 | 28.6 | 16.7 | 79.3 |
| 6.2 | 2.645 | 2.559 | 3.2 | 43.41 | 29.4 | 16.7 | 80.6 |
| 6.3 | 2.641 | 2.562 | 3.0 | 54.12 | 30.2 | 16.7 | 82.1 |
| 6.4 | 2.637 | 2.564 | 2.8 | 54.89 | 31.2 | 16.7 | 83.5 |
| 6.5 | 2.633 | 2.565 | 2.6 | 55.36 | 32.2 | 16.7 | 84.6 |
| 6.6 | 2.629 | 2.565 | 2.4 | 55.63 | 33.3 | 16.8 | 85.5 |
| 6.7 | 2.625 | 2.565 | 2.3 | 55.64 | 34.5 | 16.9 | 86.5 |
| 6.8 | 2.621 | 2.565 | 2.1 | 55.50 | 35.7 | 17.0 | 87.4 |
| 6.9 | 2.617 | 2.564 | 2.0 | 55.34 | 36.0 | 17.1 | 88.1 |
| 7.0 | 2.613 | 2.564 | 1.9 | 55.31 | 38.3 | 17.1 | 89.0 |
3, seek the process of the test of optimal porosity
(1) pallet is used in test, and specification is 300mm * 300mm * 55mm, even trowelling sticking layer oil after the processing of rust removing, and 150mm * 150mm trowelling vegetable oil is reserved so that boring and coring in the position in the dish;
(2) drip rear Accelerated Life compound in the middle of the pallet;
(3) the different porosities compound rolls the effect of rear test specimen;
(4) solidify rear 60 ℃ of constant temperature ovens, " bubbling " effect behind the 24h;
(6) effect after " bubbling " venting;
(7) get nothing " bubbling " test specimen and do water penetration test;
(8) get core and survey effective porosity.
4, best voidage Asphalt Mixture research
By study the technical feature of epoxy compound by diametral compression test, girder bending test, wheel tracking test, low temperature bend test, immersion Marshall Test, torture test etc.Voidage be three groups of test specimens of 3.0%, 4.0%, 5.0% (respectively called after A, B, C assembly side) mixture performance 70 ℃ (bridge floor ultimate temperature) relatively.
(1), compound strength character research
A, Marshall stability
The Marshall stability test method is to estimate a most important test method of asphalt intensity index.It also is the important means of determining optimum asphalt content.
The evaluation criterion of Marshall stability is greater than 40KN, from test situation, three kinds of prescriptions degree of stability all meet designing requirement.
B, compressive strength
Test is carried out according to " highway engineering pitch and Asphalt Mixture Experiment rules " (JTJ052-2000) Asphalt Mixture uniaxial compression tests (right cylinder method), and test specimen is the U.S.'s epoxy asphalt mixture test specimen through 60 ℃ of hot settings.Test findings sees the following form.
Compressive strength in epoxy construction not as detecting index, three groups of test findings only property for referencial use relatively, U.S. ChemCo is about 18MPa with experiment value under the condition.
(2), the temperature stabilization Journal of Sex Research of epoxy asphalt mixture
A, epoxy asphalt mixture high-temperature stable Journal of Sex Research
During test test specimen according to " highway engineering pitch and Asphalt Mixture Experiment rules " (JTJ052-2000) in the rut forming method, by experimental study, U.S.'s epoxy asphalt mixture wheel tracking test all is almost not distortion under 60 ℃.Be the dynamic stability of rut plate under 60 ℃ after solidifying shown in the following table.
(JTJ052-2000) stipulate that dynamic stability is (inferior/as mm) to require greater than 3000 times/mm according to " highway engineering pitch and Asphalt Mixture Experiment rules ".
B, the research of epoxy asphalt mixture crack resistance at low-temperature
Test adopts 3 Loading Method to load, and loading speed is 50mm/min.Test findings is as shown in the table.
From test findings, indices is more approaching between prescription A, the B.Show good cryogenic property and ageing resistance.
(3). the research of epoxy asphalt mixture water stability
A, immersion Marshall performance study
Test findings such as following table
Can be as drawing a conclusion according to test findings in the upper table:
U.S.'s epoxy asphalt mixture, immersion Marshall Test as a result performance order from high to low are prescription C＞prescription B＞prescription A; By " standard specification for construction and acceptance of highway asphalt pavement " (JTJF40-2004) three kinds of all satisfied requirements that are higher than MS0＞80% of results, and functional.
B, freeze thawing circulation cleavage strength are relatively
Analyze according to upper table obtained experimental result, can obtain as drawing a conclusion: A is best for the water stability prescription, and three test findings are functional.
Claims (1)
1. the research method of the disease-free epoxy asphalt mixture prescription of large-stride steel bridge deck comprises the steps:
(1) will gather materials and be placed in the baking oven more than 130-150 ℃ oven dry 6-10 hour;
(2) heat in advance U.S. bituminous epoxy A and B component, wherein component A is the liquid bifunctional epoxy resin that is obtained through reaction by bisphenol-A and chloropropylene oxide, B component is a kind of homogeneous complex that is comprised of petroleum bitumen and hardening agent: A is heated to 80-95 ℃, B is heated to 120-140 ℃, and remains this temperature;
(3) mould of marshal piece is put into 120 ℃ of baking oven heating 30-50 minute;
(4) A of heating and B component are poured into after mixing in proportion mixed and stirred in the used test glass of bituminous epoxy, and stirred 3-6 minute with glass bar, obtain the bituminous epoxy binder;
(5) gathering materials of will heating and be incubated drops in the agitated kettle, simultaneously the bituminous epoxy binder after stirring taken by weighing needed amount and puts in the agitated kettle, mixes and stirs 1-3 minute, obtains mixture;
(6) take by weighing the breeze that heated and put into mixture the inside after mixing and stirring, continue to stir 1-3 minute again, make epoxy asphalt mixture, the target temperature of compound is 120 ℃;
(7) epoxy asphalt mixture that mixes and stirs is contained in the pot in the pallet of testing usefulness from mixing and stirring, measured the asphalt that mixes and stirs, make its temperature reach 120 ℃;
(8) epoxy asphalt mixture in the pallet was put in 120 ℃ the baking oven health 30～40 minutes, conditioned time is from mixing and stirring the Time Calculation of mixing and stirring beginning in the pot;
(9) after the health, take out two-sided the hitting real each 50 times of asphalt in the pallet, make as early as possible marshal piece;
(10) marshal piece that makes was put in 120 ℃ of baking ovens health 6 hours;
(11) test specimen after the health cools off rear bulk density at normal temperatures, carries out stability test, determines asphalt content and bitumen aggregate ratio by the relation of density, voidage, degree of stability and flow valuve and pitch saturation degree;
The process of the test of wherein measuring voidage is as follows:
Pallet is used in the A test, and specification is 300mm * 300mm * 55mm, even trowelling sticking layer oil after the processing of rust removing, and 150mm * 150mm trowelling vegetable oil is reserved so that boring and coring in the position in the dish;
Drip rear Accelerated Life compound in the middle of the B pallet;
C measures the effect that different voidage compounds roll rear test specimen;
D solidifies rear 60 ℃ of constant temperature ovens, " bubbling " effect behind the mensuration 24h;
E measures the rear effect of " bubbling " venting;
F gets without " bubbling " test specimen and does water penetration test;
G gets core and surveys effective porosity.
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| CN106872304B (en) * | 2017-01-20 | 2019-10-25 | 武汉理工大学 | Fine aggregate bitumen mixture specimen humidity health-preserving method |
| CN107098621A (en) * | 2017-03-31 | 2017-08-29 | 广东省长大公路工程有限公司 | The design method of steel box girder bridge plane system life-cycle high-temp epoxy asphalt |
| CN109507401A (en) * | 2018-11-08 | 2019-03-22 | 桂林理工大学 | A kind of novel emulsion asphalt Marshall method |
| CN113009119A (en) * | 2021-02-01 | 2021-06-22 | 南京建优科技有限公司 | Asphalt wax content test method |
| CN114093439B (en) * | 2021-11-03 | 2022-11-22 | 上海群康沥青科技股份有限公司 | Design method of plant-mixed hot recycled asphalt mixture with high proportion RAP |
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