CN109100393A - The evaluation method of asphalt heat and mass behavioral implications when fire retardant is to fire - Google Patents
The evaluation method of asphalt heat and mass behavioral implications when fire retardant is to fire Download PDFInfo
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- CN109100393A CN109100393A CN201811006918.1A CN201811006918A CN109100393A CN 109100393 A CN109100393 A CN 109100393A CN 201811006918 A CN201811006918 A CN 201811006918A CN 109100393 A CN109100393 A CN 109100393A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N25/22—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 on combustion or catalytic oxidation, e.g. of components of gas mixtures
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Abstract
The present invention be a kind of fire retardant to fire when asphalt heat and mass behavioral implications evaluation method, belong to asphalt pavement technique field, solve the problems, such as can only to test by macroscopic view at present inhibiting effect that characterization fire retardant burn to asphalt, without evaluate fire retardant to heat transfer in asphalt combustion process, mass transfer behavioral implications, fire retardant cannot be disclosed to mixture fire retardant mechanism.The method comprises the steps of firstly, preparing asphalt track plate test specimens, are cut into cone calorimetry test specimen, measure the test parameters for multi- scenarios method numerical simulation；Secondly, establishing tunnel sheet pavement burning numerical model in Auto CAD, COMSOL multi- scenarios method software is imported, controlling equation group is set, each parameter is solved；Finally, fire retardant is to the field distribution of bituminous pavement temperature and heat and mass behavioral implications under sunykatuib analysis difference fire working, and compared with test result, the influence of asphalt heat and mass behavior when evaluating fire retardant to fire is of great significance to research and development efficient flame-retarding agent.
Description
Technical field
The present invention be a kind of fire retardant to fire when asphalt heat and mass behavioral implications evaluation method, belong to drip
Green pavement technique field.
Background technique
It is rapidly developed with highway in China and stereo urban traffic, a large amount of Tunnel Engineering has been built, because bituminous pavement is smooth, nothing
Seam, driving is comfortable, with small vibration, low noise, wear-resisting, the construction time is short, maintenance is easy, reproducible utilization, is suitable for stage construction etc.
Advantage is used widely in tunnel road surface.But bituminous pavement can thermally decompose under high temperature environment, discharge big calorimetric
And poison gas, lead to mass casualties and property loss.Currently used flame resistant method is that one is added in bituminous pavement
Quantitative fire retardant inhibits the burning of fire process bituminous pavement, reduces poison gas and is precipitated.
When fire occurs for tunnel, tunnel fire hazard is a kind of out of control combustion phenomena, is occurred, development and extinguishing are
One complicated physical and chemical process changed over time, including the burning of a variety of combustibles, gas Complex Flows and each
The heat and mass behavior of kind form.There is researcher to think that the burning situation of cone calorimetry test method simulation is similar to really
Burning situation, and can truly reflect the combustibility of asphalt under fire conditions, measure test result and large-scale simulation
Fire test has good correlation, measured test data, such as ignitor firing time, heat release rate, total release heat, mass loss
The parameters such as rate, cigarette generating rate, active combustion heat can be used to evaluate the combustibility of asphalt, research nanometer resistance
Agent is fired to the fire retardant mechanism of asphalt, also data can be used for numerical simulation, is designed for nanocomposite and fiery
Calamity modeling provides more data..
COMSOL software can be used for the various physical processes in model engineering field, have efficient calculated performance and more
Direct coupling analysis ability realizes any multiple physical field exact numerical emulation.It has lot of advantages, can such as solve more
Problem has completely open framework, and the parameter that can be solved according to any independent function control has the calculating of profession
Model library embeds CAD modeling tool abundant and has comprehensive third party CAD import feature, has powerful mesh generation
Ability has large-scale calculations ability, possesses post-processing function abundant.The soluble problem packet of the software thermal conduction module
It includes: conducting, any combination of radiation and convection current.Modeling interface type includes: that surface-to-surface radiates, non-isothermal flows, in active mass
Heat transfer and thin layer and shell in heat transfer etc..Hot transfer module largely extends base in the kernel software packet
The analytic function of this heat transfer.One most important improvement is the Modeling interface of surface-to-surface radiation, this is its significant advantage.This
Outside, for the heat transfer process by conduction, convection current and radiation, the model interface of foundation can more easily define complicated heat
Problem of transmission.Hot transfer module also achieves complete multiple physical field coupling analysis function, this makes heat transmitting and other field
It is coupled together analyze and be possibly realized.
The model library of hot transfer module is divided into three parts, including heat analysis, heat treatment and hot-working in electronics industry, doctor
Treatment technology and biomedicine.The new feature of hot transfer module include surface-to-surface radiation based on radiation principle, for free convection and
The non-isothermal flowing of thermal expansion has the flow boundary condition of any flow velocity to describe the running of fan, with low and high conductance
Thin layer and shell in heat transmitting, heat transfer process post-processing, can handle any heat transfer process high flexibility and
The outer heat transmitting boundary condition of broad applicability, plane, anisotropy pyroconductivity etc..
Foreign scholar establishes various nano-structured patterns using COMSOL, including carbon nanotube, nano wire, nanometer
Porous media etc., with the combination of operating automation nanotechnology and engineering technology, COMSOL is considered as being most suitable for doing
The software of nanostructure research.Method that Computer Numerical Simulation is combined with experimental study is to study tunnel fire hazard to have efficacious prescriptions
The loss of tunnel fire hazard can be preferably minimized by method using these methods.Fire computer simulation method is according to fire physics
The difference of the division of control volume and mathematical model in model survey region can be divided into field simulation, regional simulation, network analog three
Kind.
But current few researchers obtain combustion parameter based on the test of cone calorimetry, with COMSOL software
Numerical simulation is carried out to bituminous pavement combustion process during tunnel fire hazard, studies fire process fire retardant to tunnel sheet pavement
The influence of thermo parameters method, heat and mass rule in porous media.Pitch is mixed when the present invention provides a kind of fire retardant to fire
The evaluation method of material heat and mass behavioral implications is closed, so that the fire retardant mechanism of fire retardant is deeply disclosed, it is high for targetedly research and development
The fire retardant of effect provides scientific basis.
Summary of the invention
(1) technical problem
The evaluation side of asphalt heat and mass behavioral implications when it is an object of the present invention to provide a kind of fire retardants to fire
Method, solve at present can only by macroscopic view test characterization fire retardant burn to asphalt inhibiting effect, be theoretically unsound,
Do not evaluate fire retardant to heat transfer during this multi-hole medium combustion of asphalt, mass transfer behavioral implications, cannot be from essence
The problem of upper announcement fire retardant is to asphalt fire retardant mechanism has to efficient asphalt fire retardant is further researched and developed
Significance.
(2) technical solution
In order to solve that inhibiting effect, the shortage that characterization fire retardant burns to asphalt can only be tested by macroscopic view at present
Theoretical foundation, without evaluation fire retardant to heat transfer during this multi-hole medium combustion of asphalt, mass transfer behavioral implications, no
The problem of fire retardant is to asphalt fire retardant mechanism can inherently be disclosed, the drip when present invention provides a kind of fire retardant to fire
The evaluation method of green mixture heat and mass behavioral implications, specific technical solution are as follows: preparing AC-13 gradation first and do not sum it up and add
The asphalt track plate test specimen of fire retardant is added to be cooled to room temperature rear demoulding, cutting track plate prepares cone calorimetry test specimen,
The upper surface for retaining former track plate is upward, and bituminous pavement is by thermal condition when simulated fire；Then, test specimen is lighted, is measured for more
The test parameters of field Coupled Numerical Simulation；Secondly, establishing tunnel sheet pavement burning numerical model in Auto CAD, import
COMSOL multi- scenarios method is analyzed in software, definition material attribute and boundary condition, and setting heat transfer, heat are transmitted and the control of heat radiation
Property equation group processed carries out grid dividing to model, solves each parameter by solver；Finally, changing different materials attribute, hot spoke
Intensity and boundary condition are penetrated, fire retardant is to asphalt pavement structure distribution law of temperature field under sunykatuib analysis difference tunnel fire hazard operating condition
It with heat and mass behavioral implications, and is compared with cone calorimetry test result, pitch mixes when evaluating fire retardant to fire
Expect the influence of heat and mass behavior.
(3) beneficial effect
Lack reliable data and parameter for tunnel fire hazard process bituminous pavement heat and mass Behavior modeling, lacks to drip
The evaluation method of green mixture heat transfer, mass transfer behavior, it is difficult to inherently disclose fire retardant porous Jie this to asphalt
The influence of the burning behavior of matter.Method provided by the invention is based on porous medium theory, establishes asphalt surface hot under tunnel fire hazard
Decomposition model, using method for numerical simulation to tunnel sheet pavement thermo parameters method in the case of tunnel fire hazard and heat and mass behavior
It is analyzed, influence of the fire retardant to bituminous pavement thermal decomposition process heat and mass behavior is studied, by experimental study and Numerical-Mode
It is quasi- to combine, further illustrate that asphalt fire retardant mechanism drops to more efficiently flame-retardant pitch material is researched and developed in fire retardant
Low fire hazard improves tunnel sheet pavement fire safety and is of great significance.
Specific embodiment
The evaluation method of asphalt heat and mass behavioral implications when the present invention provides a kind of fire retardants to fire, tool
Body implementation steps are as follows:
(1) SBS modified pitch and AC-13 gradation types are used, preparation length is 30cm, width 30cm, with a thickness of 5cm
Asphalt track plate test specimen two, one is not added fire retardant, and the fire retardant of another addition 8% is torn open after being cooled to room temperature
Mould；
(2) cutting track plate preparation length is that 10cm, width 10cm are wrapped up with aluminium-foil paper and being bored with a thickness of the test specimen of 4cm
Shape calorimeter test specimen bottom and side carry out cone calorimetry test, and the upper surface for retaining former track plate is upward, when simulated fire
Bituminous pavement is by thermal condition；
(3) test specimen is lighted, the test parameters for multi- scenarios method numerical simulation, including ignitor firing time, heat release speed are measured
Rate, total release heat, mass loss rate, cigarette generating rate and active combustion heat；
(4) tunnel sheet pavement burning numerical model is established in Auto CAD, and it is soft to import the analysis of COMSOL multi- scenarios method
In part, definition material attribute and boundary condition, setting heat transfer, heat are transmitted and the controlling equation group of heat radiation；
(5) grid dividing is carried out to model, each parameter is solved by solver, post-treated realization calculated result is visual
Change, 2 d plane picture, 3 dimensional drawing, isogram, polar plot, deformation pattern, the streamline of each parameter are calculated needed for intuitively drawing
Figure and flue gas particles track figure；
(6) change different materials attribute, caloradiance and boundary condition, hindered under sunykatuib analysis difference tunnel fire hazard operating condition
Agent is fired to asphalt pavement structure distribution law of temperature field and heat and mass behavioral implications, and is carried out with cone calorimetry test result
Compare, the influence of asphalt heat and mass behavior when evaluating fire retardant to fire.
Claims (1)
1. the present invention be a kind of fire retardant to fire when asphalt heat and mass behavioral implications evaluation method, feature exists
In this method, specific step is as follows:
(1) SBS modified pitch and AC-13 gradation types are used, preparation length is 30cm, width 30cm, with a thickness of 5cm pitch
Mixture track plate test specimen two, one is not added fire retardant, and the fire retardant of another addition 8% is cooled to room temperature rear demoulding；
(2) cutting track plate preparation length is 10cm, width 10cm, with a thickness of the test specimen of 4cm, wraps up taper amount with aluminium-foil paper
Hot instrument test specimen bottom and side carry out cone calorimetry test, and the upper surface for retaining former track plate is upward, pitch when simulated fire
Road surface is by thermal condition；
(3) test specimen is lighted, measures the test parameters for multi- scenarios method numerical simulation, including is ignitor firing time, heat release rate, total
Discharge heat, mass loss rate, cigarette generating rate and active combustion heat；
(4) tunnel sheet pavement burning numerical model is established in Auto CAD, is imported in COMSOL multi- scenarios method analysis software,
Definition material attribute and boundary condition, setting heat transfer, heat are transmitted and the controlling equation group of heat radiation；
(5) grid dividing is carried out to model, each parameter is solved by solver, post-treated realization calculated result visualizes, directly
See 2 d plane picture, 3 dimensional drawing, isogram, polar plot, deformation pattern, motion pattern and the cigarette that each parameter is calculated needed for drawing
Gas particles track figure；
(6) change different materials attribute, caloradiance and boundary condition, fire retardant under sunykatuib analysis difference tunnel fire hazard operating condition
Compared to asphalt pavement structure distribution law of temperature field and heat and mass behavioral implications, and with cone calorimetry test result
Compared with the influence of asphalt heat and mass behavior when evaluating fire retardant to fire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811006918.1A CN109100393A (en) | 2018-08-28 | 2018-08-28 | The evaluation method of asphalt heat and mass behavioral implications when fire retardant is to fire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811006918.1A CN109100393A (en) | 2018-08-28 | 2018-08-28 | The evaluation method of asphalt heat and mass behavioral implications when fire retardant is to fire |
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| CN109100393A true CN109100393A (en) | 2018-12-28 |
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| CN201811006918.1A Pending CN109100393A (en) | 2018-08-28 | 2018-08-28 | The evaluation method of asphalt heat and mass behavioral implications when fire retardant is to fire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110728092A (en) * | 2019-10-22 | 2020-01-24 | 陕西铁路工程职业技术学院 | Method for establishing and using temperature coupling model of mixed asphalt pavement structure |
-
2018
- 2018-08-28 CN CN201811006918.1A patent/CN109100393A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110728092A (en) * | 2019-10-22 | 2020-01-24 | 陕西铁路工程职业技术学院 | Method for establishing and using temperature coupling model of mixed asphalt pavement structure |
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