CN107870179A - Method for measuring bituminous concrete thermal contact resistance - Google Patents
Method for measuring bituminous concrete thermal contact resistance Download PDFInfo
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- CN107870179A CN107870179A CN201711346391.2A CN201711346391A CN107870179A CN 107870179 A CN107870179 A CN 107870179A CN 201711346391 A CN201711346391 A CN 201711346391A CN 107870179 A CN107870179 A CN 107870179A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention discloses a kind of method for measuring bituminous concrete thermal contact resistance, the thermal contact resistance tested using thermal-flow sensor test method(s) between bituminous concrete and heat exchange pipeline, the seamless steel pipe arranged by burying temperature sensor, heat flow transducer and winding type in test specimen, temperature sensor is embedded among test specimen, respectively away from surface 20mm, 40mm, 60mm, 80mm；Heat flow transducer is fixed on the outer wall of seamless steel pipe interlude steel pipe, and steel pipe is away from surface of test piece 80mm；After test material preparation, surrounding is wrapped up using heat-insulating heat-preserving material, causes heat as far as possible only along gravity direction transmission, is used as thermal source using infrared lamp during thermal-arrest, be can control the different in flow rate and heat transferring medium of temperature to flow in pipe；After the temperature difference and the hot-fluid that measure contact interface, according to the definition of thermal contact resistance, you can thermal contact resistance is calculated.Computational methods of the present invention according to thermal contact resistance, can obtain the situation of change of thermal contact resistance under different gradation, different thermal conductivity factor test specimens, different temperatures.
Description
Technical field
The invention belongs to technical field of road engineering materials, and in particular to one kind is used to measure bituminous concrete thermal contact resistance
Method.
Background technology
Bituminous paving has stronger solar radiative absorption ability (absorptivity that 0.3~3 μm of wavelength is 0.86~0.90),
Road surface maximum temperature is up to 70 DEG C, and under temperature-load coupling, road surface easily occurs rut, gathers around the forever change such as bag, passage
Shape is damaged, so as to substantially reduce the service life of bituminous paving.In addition, pavement temperature also has tremendous influence, road to atmospheric temperature
The solar energy that table absorbs there are about 95% and be discharged in the form of sensible heat and long-wave radiation into environment, and its radiation processes is slow, be to add
An important factor for acute city " tropical island effect ".Solar energy heating formula bituminous paving (Asphalt pavement solar
Collector, APSC) this portion of energy can be collected, while pavement temperature is reduced, by the embedded heat exchange of inside asphalt pavement
Pipeline, in the high temperature time, the solar energy that bituminous paving absorbs is taken away using heat transferring medium, so as to reduce pavement temperature, inhaled in addition
The energy of receipts, according to different demands, available for domestic water heating, the auxiliary thermal source of cold district earth-source hot-pump system, winter
The deicing or snow melting (being combined with across season energy storage technology) on road surface.
In recent years, solar energy heating formula bituminous paving is by more and more extensive concern, its solar collecting performance, influence factor and
Optimization design is hot issue of concern.In fact, the optimization of APSC solar collecting performances depends on the depth to its heat-transfer character
Enter understanding.Compared with plain asphalt road surface, APSC heat transfer process is increasingly complex, especially between concrete and heat exchange pipeline
Existing thermal contact resistance, it is the key link for influenceing APSC solar collecting performances.
The present invention intends at home and abroad on Research foundation, by studying a kind of side for being used to measure bituminous concrete thermal contact resistance
Method.Result of study can deepen the understanding to solar energy heating formula bituminous paving heat-transfer character, for researching and developing corresponding Drag reduction devices,
It is significant to improve APSC solar collecting performances.
The content of the invention
It is an object of the invention to provide a kind of method for measuring bituminous concrete thermal contact resistance, based on bituminous concrete
Actual contact state between heat exchange pipeline, using the contact heat of independently developed thermal-flow sensor test method(s) accurate measurement between the two
Resistance.
The purpose of the present invention is achieved through the following technical solutions：For measuring the side of bituminous concrete thermal contact resistance
Method, comprise the following steps：
Step 1：Prepare the bitumen mixture specimen of rectangular shape；
Step 2：4 temperature sensors, 1 heat flow transducer and 1 seamless steel pipe, 4 temperature are buried in test specimen
Sensor is embedded among test specimen, respectively away from test specimen upper surface 20mm, 40mm, 60mm, 80mm；Seamless steel pipe is by opening direction phase
2 anti-U-shaped compositions, heat flow transducer are arranged on the intermediate parallel section outer wall of steel pipe of seamless steel pipe, and with away from test specimen upper surface
The temperature sensor set at 80mm is close to seamless steel pipe is arranged on away from the 80mm of test specimen upper surface；
Step 3：The test specimen is heated using radiating light source, after beginning to warm up, at interval of 30 minutes, gather away from
Each measuring point temperature of bituminous concrete that the temperature sensor measurement set at test specimen upper surface 20mm, 40mm, 60mm obtains, and away from
The temperature T for the seamless steel pipe outer wall that the temperature sensor and heat flow transducer measurement set at the 80mm of test specimen upper surface obtainspWith
Hot-fluid qp, respectively surveyed according to the bituminous concrete that the temperature sensor measurement set at test specimen upper surface 20mm, 40mm, 60mm obtains
The data are fitted extrapolation with least square method and obtain the temperature T of bituminous concrete interface at different moments by point temperaturea, according to
According to Fourier law, the temperature-time curve derivation to fitting, the hot-fluid for trying to achieve bituminous concrete interface at different moments is close
Spend qa；
Step 4：By Ta、Tp、qaAnd qpBring formula intoHeated at different moments
When bituminous concrete thermal contact resistance RC；
Step 5：When temperature be heated to maximum i.e. temperature value float it is smaller when, stop radiating light source the test specimen is added
Heat, and heat transferring medium is passed through into seamless steel pipe, start after being passed through heat transferring medium, at interval of 30 minutes, gather away from test specimen upper table
Each measuring point temperature of bituminous concrete that the temperature sensor measurement set at face 20mm, 40mm, 60mm obtains, and away from test specimen upper table
The temperature T for the seamless steel pipe outer wall that the temperature sensor and heat flow transducer measurement set at the 80mm of face obtainsp' and hot-fluid qp',
It can stop gathering after each measuring point temperature stabilization, according to the temperature sensor set at test specimen upper surface 20mm, 40mm, 60mm
Obtained each measuring point temperature of bituminous concrete is measured, extrapolation is fitted to the data with least square method and obtains pitch at different moments
Temperature T at concrete interfacea', according to Fourier law, the temperature-time curve derivation to fitting, try to achieve at different moments
The heat flow density q of bituminous concrete interfacea'；
Step 6：By Ta'、Tp'、qa' and qp' bring formula intoWhen being cooled down at different moments
The thermal contact resistance R of bituminous concreteC'。
Compared with prior art, the present invention has advantage with following：
(1) present invention uses independently developed thermal-flow sensor test method(s), and measurement apparatus mainly includes radiating light source, hot-fluid passes
Sensor, temperature sensor, bituminous concrete rut test piece, test-bed, heat-exchange working medium, water pump and assembling fittings, measurement dress
Easily acquisition on the market is put, it is economical and practical.
(2) computational methods according to thermal contact resistance, can obtain under different gradation, different thermal conductivity factor test specimens, different temperatures
The situation of change of thermal contact resistance.
Brief description of the drawings
Fig. 1 is thermal-flow sensor test method(s) schematic diagram of the present invention.
Fig. 2 is that heat exchange pipeline of the present invention (seamless steel pipe) buries schematic diagram.
Fig. 3 uses AC-5 grading curve figures for the present invention.
Fig. 4 uses AC-10 grading curve figures for the present invention.
Fig. 5 uses AC-20 grading curve figures for the present invention.
Embodiment
Definition and Fourier Heat Conduction law based on thermal contact resistance, by burying heat exchange pipeline, temperature inside rut test piece
Sensor, heat flow transducer are spent, designs thermal-flow sensor test method(s) measurement thermal contact resistance, and verify irradiation intensity, circulating water temperature
The experimental conditions such as degree, test specimen insulation.
The present invention is to ensure that the buried depth of temperature sensor (buried depth 2,4,6cm and 8 ㎝) and heat flow transducer (㎝ of buried depth 8) is accurate
True property, rut test piece is prepared by the way of layered rolling shaping, the wherein wiring of sensor is drawn by drilling；Consolidate when rolling
The position of sensor and heat exchange pipeline is set, is avoided that appearance is sunk and shifting phenomena.
Test material preparation of the present invention is according to following index Design：
(1) raw material
Raw material mainly include coarse aggregate, fine aggregate, miberal powder, SBS modified pitch and heat conduction phase filling graphite and (are used to change
The heat conductivility of kind asphalt).Coarse aggregate and fine aggregate are Zhenjiang Mao Di limestone, and miberal powder is limestone mineral powder, stone
The graphite powder of black chemical reagent Co., Ltd production of being passed the civil service examinations for Tianjin.The performance indications of each raw material are as shown in 1~table of table 5.
Table 1SBS performance of modified bitumen indexs
The coarse aggregate performance test results of table 2
The fine aggregate performance indications of table 3
The limestone mineral powder the performance test results of table 4
The main character of the graphite of table 5
(2) grading used in test material preparation
For influence of the evaluation different gradation asphalt to thermal contact resistance, present invention employs AC-5, AC-10, AC-20
Three kinds of gradings with different nominal maximum aggregate sizes, its result such as difference is as seen in figures 3-5.
Embodiment
1st, preparing complete thick formula rut plate test specimen (300mm × 300mm × 150mm) needs three 5cm ruts board molds and two
Individual 3cm ruts board mold, and the drilling of mould surrounding is so as to sensor passes out of hole (heat flow transducer when preventing that Measuring Device is compacted
It is cut off with temperature sensor).Whole test specimen is made up of the first test specimen, the second test specimen, the 3rd test specimen and the 4th test specimen, and first passes
Sensor, second sensor, 3rd sensor, the burial place of the 4th sensor be respectively whole test specimen away from upper surface 2cm, 4cm,
At 6cm, 8cm.
Prepare the first high test specimens of 8cm first, and lower digging 1cm by seamless steel pipe (external diameter 20mm, internal diameter 16mm) out of hole
Pass, in opening direction it is opposite there is three parallel-segments and 2 U-shaped section of steel tube seamless to be formed by connecting, three parallel-segments
Spacing is 100mm, and layout drawing is as shown in Figure 2.Heat flow transducer and the are buried in the outer wall of steel pipe of seamless steel pipe intermediate parallel section
Four temperature sensors, heat flow transducer and the 4th temperature sensor are respectively positioned on the first test specimen centre position, Measuring Device front compacting 3
Under, (position that need to fix sensor and heat exchange pipeline in real time is hit, avoid displacement from sinking) under reverse side compacting 13, then stood
24h；The second high test specimens of 2cm are prepared according still further to same method after 24h, and bury three-temperature sensor in the second test specimen
In test specimen centre position, under Measuring Device front compacting 3, under reverse side compacting 13；Then the 3rd high test specimens of 3cm are prepared, and by
Two temperature sensors are embedded in test specimen centre position, and Measuring Device front is hit under real 3, and reverse side is hit under real 13；It is high finally to prepare 2cm
4th test specimen, and the first temperature sensor is embedded in the 4th test specimen centre position, Measuring Device front is hit under real 3, and reverse side hits reality
Under 13；So far complete thick formula rut plate test material preparation is completed, and for front view as shown in figure 1, standing 24h, test specimen surrounding uses heat-insulated guarantor
Adiabator wraps up.
2nd, using 2 × 275W infrared lamp as radiation source；Cooling procedure after simulated roadway heating, i.e. heating are treated first
Water flowing cools down after temperature stabilization, is heated to stop heating after maximum i.e. temperature fluctuations are smaller after temperature, and into seamless steel pipe
Water flowing, after repeatedly circulation, the temperature of water can improve recirculated water, therefore, can not stop to be passed through running water without using following
Ring water, and ambient-temp-stable is kept, and maintain water temperature in 0.5 DEG C and fluctuate as far as possible, after water flowing after each measuring point temperature stabilization
Terminate experiment.The temperature and heat flow density of each measuring point are taken every 30min；Secondly simulated roadway heating is carried out simultaneously with water flowing cooling
Process, i.e., radiation and water flowing carry out simultaneously, after temperature stabilization terminate test, take the temperature and heat of each measuring point every 30min
Current density.It is 21 ± 0.5 DEG C that room temperature is controlled during experiment, and the temperature of heat transferring medium (running water) is 19 ± 0.5 DEG C.
3rd, each measuring point temperature of bituminous concrete is obtained by temperature sensor measurement, with least square method to test specimen 9cm,
11cm, 13cm temperature foh are extrapolated and obtain bituminous concrete interface (at test specimen 7cm) temperature Ta, determine according to Fourier
Restrain, the temperature-time curve derivation to fitting, bituminous concrete interface (at test specimen 7cm) heat flow density can be tried to achieve
qa；Heat exchange pipeline outside wall temperature TpWith hot-fluid qpMeasured by heat flow transducer；Bring the data of acquisition into formulaIt can obtain thermal contact resistance RC。
It can be seen from above-mentioned test result analysis：
1. it is using the thermal contact resistance between independently developed thermal-flow sensor test method(s) measurement bituminous concrete and heat exchange pipeline
Feasible.This method can obtain the distribution situation of temperature and heat flow density in concrete, and try out in calculating quasi steady state heat transfer
The calculating of process contact thermal resistance.
2. this method bituminous concrete is tested using tri- kinds of gradings of AC-5, AC-10 and AC-20, AC-5 contact heat
Thermal contact resistance of the resistance less than AC-10 and AC-20, answers the less fine grading making sun of the nominal particle diameters such as prioritizing selection AC-5 gradings
The pipe laying layer of energy heat collecting type bituminous paving.
3. this method using adding graphite to improve the heat conductivility of bituminous concrete, can speed up heat and be passed to test specimen inside
Pass, and reduce the thermal contact resistance between concrete and heat exchange pipeline.Therefore, meet to require in concrete pavement performance and mechanical property
In the case of, the more preferable asphalt of heat conductivility should be used.
4. this method studies the influence of the Temperature on Contact Resistance of Metallic Surfaces Temperature on bituminous concrete surface using different radiation conditions, hair
The variation tendency of existing three kinds of grading thermal contact resistances is similar, and thermal contact resistance increases with the increase of temperature, is tended towards stability in temperature
Afterwards, the thermal contact resistance of AC-5 gradings test specimen is still minimum.
Claims (9)
1. the method for measuring bituminous concrete thermal contact resistance, it is characterised in that comprise the following steps：
Step 1：Prepare the bitumen mixture specimen of rectangular shape；
Step 2：4 temperature sensors, 1 heat flow transducer and 1 seamless steel pipe, 4 TEMPs are buried in test specimen
Device is embedded among test specimen, respectively away from test specimen upper surface 20mm, 40mm, 60mm, 80mm；Seamless steel pipe is by opening direction opposite
2 U-shaped compositions, heat flow transducer are arranged on the intermediate parallel section outer wall of steel pipe of seamless steel pipe, and with away from test specimen upper surface 80mm
The temperature sensor for locating to set is close to seamless steel pipe is arranged on away from the 80mm of test specimen upper surface；
Step 3：The test specimen is heated using radiating light source, after beginning to warm up, at interval of 30 minutes, gathered away from test specimen
Each measuring point temperature of bituminous concrete that the temperature sensor measurement set at upper surface 20mm, 40mm, 60mm obtains, and away from test specimen
The temperature T for the seamless steel pipe outer wall that the temperature sensor and heat flow transducer measurement set at the 80mm of upper surface obtainspAnd hot-fluid
qp, according to the obtained each measuring point temperature of bituminous concrete of temperature sensor measurement set at test specimen upper surface 20mm, 40mm, 60mm
Degree, extrapolation is fitted to the data with least square method and obtains the temperature T of bituminous concrete interface at different momentsa, according to Fu
In leaf law, the temperature-time curve derivation to fitting, try to achieve the heat flow density of bituminous concrete interface at different moments
qa；
Step 4：By Ta、Tp、qaAnd qpBring formula intoIt can obtain pitch when heating at different moments
The thermal contact resistance R of concreteC；
Step 5：Treat that temperature is heated to maximum, stop radiating light source and the test specimen is heated, and be passed through and change into seamless steel pipe
Thermal medium, start after being passed through heat transferring medium, at interval of 30 minutes, gather away from setting at test specimen upper surface 20mm, 40mm, 60mm
Each measuring point temperature of bituminous concrete that temperature sensor measurement obtains, and away from the temperature sensor set at the 80mm of test specimen upper surface
The temperature T of the seamless steel pipe outer wall obtained with heat flow transducer measurementp' and hot-fluid qp', it can stop after each measuring point temperature stabilization
Only gather, respectively surveyed according to the bituminous concrete that the temperature sensor measurement set at test specimen upper surface 20mm, 40mm, 60mm obtains
The data are fitted extrapolation with least square method and obtain the temperature T of bituminous concrete interface at different moments by point temperaturea', according to
According to Fourier law, the temperature-time curve derivation to fitting, the hot-fluid for trying to achieve bituminous concrete interface at different moments is close
Spend qa'；
Step 6：By Ta'、Tp'、qa' and qp' bring formula intoIt can obtain pitch when cooling down at different moments
The thermal contact resistance R of concreteC'。
2. the method as described in claim 1, it is characterised in that described bituminous concrete uses AC-5, AC-10 or AC-20
Grading.
3. the method as described in claim 1, it is characterised in that the specification of rut test piece is 300mm × 300mm × 150mm.
4. the method as described in claim 1, it is characterised in that the spacing between three parallel-segments of seamless steel pipe is 100mm.
5. the method as described in claim 1, it is characterised in that the external diameter 20mm of seamless steel pipe, internal diameter 16mm.
6. the method as described in claim 1, it is characterised in that bituminous concrete composition include coarse aggregate, fine aggregate, miberal powder,
SBS modified pitch and heat conduction phase filling graphite.
7. the method as described in claim 1, it is characterised in that heat transferring medium uses running water.
8. the method as described in claim 1, it is characterised in that radiating light source uses infrared lamp.
9. the method as described in claim 1, it is characterised in that test specimen surrounding is wrapped up using heat-insulating heat-preserving material.
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| CN108627536A (en) * | 2018-04-04 | 2018-10-09 | 长安大学 | A kind of cast-type conductive asphalt concrete conduction thermal effect predictor method |
| CN109001251A (en) * | 2018-05-25 | 2018-12-14 | 扬州大学 | A kind of physical method for reducing asphalt skin temperature |
| CN109187629A (en) * | 2018-09-04 | 2019-01-11 | 成都市科创节能材料有限公司 | A kind of equivalent thermal resistance and thermal coefficient detection method of insulating mold coating for building |
| CN110006944A (en) * | 2019-04-28 | 2019-07-12 | 扬州大学 | Rubber support internal structure heating conduction experiment research and device |
| CN110057866A (en) * | 2019-05-22 | 2019-07-26 | 南京林业大学 | A kind of test device and test method that the soil body-structural interface heating influences soil temperature |
| CN111077181A (en) * | 2019-12-06 | 2020-04-28 | 国网浙江省电力有限公司电力科学研究院 | Device and method for testing thermal contact resistance between outer surface of medium-low voltage cable and soil |
| CN112946015A (en) * | 2021-01-29 | 2021-06-11 | 浙江大学 | Test device and method for measuring soft soil interface thermal contact resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627536A (en) * | 2018-04-04 | 2018-10-09 | 长安大学 | A kind of cast-type conductive asphalt concrete conduction thermal effect predictor method |
| CN108627536B (en) * | 2018-04-04 | 2020-06-16 | 长安大学 | Method for estimating conduction heat effect of cast conductive asphalt concrete |
| CN109001251A (en) * | 2018-05-25 | 2018-12-14 | 扬州大学 | A kind of physical method for reducing asphalt skin temperature |
| CN109187629A (en) * | 2018-09-04 | 2019-01-11 | 成都市科创节能材料有限公司 | A kind of equivalent thermal resistance and thermal coefficient detection method of insulating mold coating for building |
| CN109187629B (en) * | 2018-09-04 | 2021-04-09 | 成都市科创节能材料有限公司 | Equivalent thermal resistance detection method of heat-insulating coating for building |
| CN110006944A (en) * | 2019-04-28 | 2019-07-12 | 扬州大学 | Rubber support internal structure heating conduction experiment research and device |
| CN110006944B (en) * | 2019-04-28 | 2023-12-26 | 扬州大学 | Experimental research method and device for heat conducting performance of internal structure of rubber support |
| CN110057866A (en) * | 2019-05-22 | 2019-07-26 | 南京林业大学 | A kind of test device and test method that the soil body-structural interface heating influences soil temperature |
| CN111077181A (en) * | 2019-12-06 | 2020-04-28 | 国网浙江省电力有限公司电力科学研究院 | Device and method for testing thermal contact resistance between outer surface of medium-low voltage cable and soil |
| CN111077181B (en) * | 2019-12-06 | 2022-03-22 | 国网浙江省电力有限公司电力科学研究院 | Device and method for testing thermal contact resistance between outer surface of medium-low voltage cable and soil |
| CN112946015A (en) * | 2021-01-29 | 2021-06-11 | 浙江大学 | Test device and method for measuring soft soil interface thermal contact resistance |
| CN112946015B (en) * | 2021-01-29 | 2022-09-13 | 浙江大学 | Test device and method for measuring soft soil interface thermal contact resistance |
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