CN105842121B - Asphalt based on wetting theory most preferably mixes and stirs temperature determining method - Google Patents
Asphalt based on wetting theory most preferably mixes and stirs temperature determining method Download PDFInfo
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- CN105842121B CN105842121B CN201610157940.0A CN201610157940A CN105842121B CN 105842121 B CN105842121 B CN 105842121B CN 201610157940 A CN201610157940 A CN 201610157940A CN 105842121 B CN105842121 B CN 105842121B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
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Abstract
The present invention relates to the asphalts based on wetting theory most preferably to mix and stir temperature determining method, belongs to construction of the highway method field.The present invention measured respectively according to wetting theory the surface tension of pitch, pitch and mineral aggregate contact angle, and then the curved line relation that the adhesion work of pitch and mineral aggregate varies with temperature at a high temperature of obtaining, fit curve equation acquires maximum adhesion work(, that is best wetting coherent condition of the pitch to mineral aggregate at high temperature, the best of asphalt is may be used to determine with the temperature corresponding to maximum adhesion work((best wetting state) and mixes and stirs temperature, is suitable for basis bitumen and modified bitumen.This is determines that the best mix temperature of asphalt provides new method, for selecting suitable asphalt construction temperature to have certain directive significance.
Description
Technical field
Method that asphalt mixes and stirs temperature being determined based on wetting theory under the high temperature conditions the present invention relates to a kind of,
Pitch and mineral aggregate adhesion work are there are maximum value i.e. in hyperthermia temperature range, i.e., best wetting state, and best wetting state institute is right
Mix temperature of the temperature answered as asphalt is suitable for basis bitumen and modified bitumen.
Background technology
The Moisture Damage problem of bituminous paving causes people more and more to pay close attention in recent years, and Moisture Damage greatly reduces road surface
Performance and service life.And the adhesiveness of pitch and mineral aggregate is to influence the direct factor of asphalt water sensitivity,
The adhesion process of asphalt and aggregate is pitch in mineral aggregate moistened surface, the process sprawled, by asphaltic nature, mineral aggregate property and temperature
The influence of degree.The purpose of rational selection asphalt pavement construction temperature is to realize that the sufficient wetting of pitch is gathered materials, and makes drip
Blueness uniformly wraps in surface of aggregate to improve the cementing power of asphalt and aggregate, enhances the stability of asphalt.In order to
So that pitch is adequately soaked mineral aggregate, selects suitable mix temperature extremely important.Currently, constructing both at home and abroad for asphalt
The selection of temperature is to be made a return journey by pitch viscosity-temperature curve determining, but this for modified pitch and is not suitable for, if with 2000 domestic
It formulates《Highway engineering pitch and Asphalt Mixture Experiment regulation》0.17 ± 0.02P is provided in (JTJ 052-2000)aWhen s
Corresponding temperature is as temperature is mixed and stirred, then the temperature of mixing and stirring of thus obtained modified pitch is up to 200 DEG C, this is much super
Modified pitch construction temperature specified in specification is crossed, it is clear that ageing of asphalt, energy will be brought by being inappropriate, excessively high construction temperature
A series of problems, such as source wastes.Therefore, suitable method is selected to determine that asphalt mixes and stirs temperature be very necessary.
Invention content
The present invention is based on the adhesion works that wetting theory has studied pitch and mineral aggregate under high temperature, are fitted change of the adhesion work with temperature
Change curved line relation, the maximum adhesion work((best wetting state) of pitch and mineral aggregate is obtained, with the corresponding temperature of best wetting state
It is mixed as asphalt.
Asphalt based on wetting theory most preferably mixes and stirs temperature determining method, includes the following steps：
(1) pitch, mineral aggregate are chosen；
(2) it measures within the scope of high-temperature temperature 100-200 degree at interval of the adhesion work of pitch and mineral aggregate under 10-20 degree and drafting
Adhesion work varies with temperature curve；
(3) pitch and mineral aggregate maximum adhesion work(in hyperthermia temperature range are acquired by curvilinear equation, i.e., pitch is to mineral aggregate
Best wetting state and corresponding temperature, this temperature are that the best of asphalt mixes and stirs temperature；
The method of the step (2) includes：
(A) asphalt surface tension detection：Based on hanging drop law theory, the asphalt surface tension under certain temperature is measured；
(B) at the same temperature, pitch and mineral aggregate contact angle are measured using drop method of lying；
(C) it is calculated according to adhesion work calculation formula 1 in wetting theory, bound bitumen surface tension and contact angle test data
Pitch and mineral aggregate adhesion work at this temperature；
Wsl=γl(1+cos θ) (formula 1)
In formula：
γl- surface tension of liquid, mJ/m2；
Wsl- liquid consolidates adhesion work, mJ/m2；
θ-pitch and mineral aggregate contact angle.
Step (B) the pitch titration temperature regulating device and the setting of mineral aggregate thermostatic chamber carry out constant temperature at the same temperature, will be warm
Pitch is dripped under constant temperature in mineral aggregate surface, measures contact angle numerical value when droplets stable 1s.
Mineral aggregate in the step (B) is the thin slice for being cut into 2-3mm thickness.
The pitch is matrix pitch, and ranging from 110 DEG C~190 DEG C of measuring temperature is spaced 20 DEG C of measurements, one adhesion work
Value；The pitch is modified pitch, and ranging from 140 DEG C~190 DEG C of measuring temperature is spaced 10 DEG C and measures an adherency work value.
The step (A) is automatic by computer using DSA4 (Drop Shape Analyzer 4) contact angle measurement
Image variants can immediately arrive at the surface tension of pitch.
The present invention determines Qinhuangdao 30#, 50#, 70# matrix pitch and SBS modified pitch I-D, I-DS10 and Guangxi brightness
The adhesion work of greenstone, cloud sieve limestone under high temperature (110 DEG C~190 DEG C) state is most with the corresponding temperature of maximum adhesion work(
It is good to mix temperature.
The present invention specifically mainly includes the following steps：
1, pitch selects Qinhuangdao 30# matrix pitches, 50# matrix pitches, 70# matrix pitches, I-D modified pitch, I-
DS10 modified pitch, mineral aggregate choose Guangxi diabase, cloud sieve limestone, and performance indicator meets wanting for used entity project
Ask or according to《Standard specification for construction and acceptance of highway asphalt pavement》Requirement in (JTG F40-2004).
2, it measures the adhesion work of pitch and mineral aggregate in hyperthermia temperature range according to step 3 and draws adhesion work and vary with temperature
Curve.
(1) asphalt surface tension detection, this experiment are based on hanging drop law theory using DSA4 contact angle measurements, pass through calculating
Machine auto Image Collection and processing can immediately arrive at the surface tension of pitch.Ranging from 110 DEG C~190 DEG C of measuring temperature.It draws
Asphalt surface tension varies with temperature curve.
(2) pitch and mineral aggregate contact angle determination, this experiment use drop method of lying using DSA4 contact angle measurements at high temperature
The contact angle for testing pitch and mineral aggregate tests green with brightness at 20 DEG C of interval within the scope of 110 DEG C~190 DEG C matrix pitch
The contact angle of rock and limestone mineral aggregate；SBS modified pitch test within the scope of 140 DEG C~190 DEG C be spaced 10 DEG C with diabase and
The contact angle of two kinds of mineral aggregates of limestone.
(3) number is tested according to adhesion work calculation formula 1 in surface free energy theory, bound bitumen surface tension and contact angle
According to pitch and mineral aggregate adhesion work is calculated, draws adhesion work and vary with temperature curve.
Wsl=γl(1+cos θ) (formula 1)
In formula：
γl- surface tension of liquid, mJ/m2；
Wsl- liquid consolidates adhesion work, mJ/m2；
θ-pitch and mineral aggregate contact angle；
Curve matching curvilinear equation is varied with temperature according to adhesion work, is acquired by curvilinear equation and is dripped in hyperthermia temperature range
Green and mineral aggregate maximum adhesion work(, i.e., for pitch to the best wetting state and corresponding temperature of mineral aggregate, this temperature is asphalt
Best mix and stir temperature.
3, pitch viscosity-temperature curve is drawn, the validity of temperature is mixed and stirred in verification by the asphalt that wetting theory obtains.
This experiment determines the viscosity of this 5 kinds of pitch, five temperature spot using Bu Luoke Philid viscometers, and draws viscous
Warm curve.According to viscosity-temperature curve equation acquire respectively 5 kinds of pitches mix and stir temperature (asphalt viscosity be 0.17 ± 0.02PaInstitute when s
Corresponding temperature), it mixes and stirs temperature with the asphalt obtained by step 3 and is compared analysis, verification is obtained by wetting theory
Asphalt mix and stir the feasibility of temperature, validity.
The present invention measured respectively according to wetting theory the surface tension of pitch, pitch and mineral aggregate contact angle, and then obtain
At a high temperature of the curved line relation that varies with temperature of the adhesion work of pitch and mineral aggregate, fit curve equation acquires maximum adhesion work(, i.e.,
Pitch is to the best wetting coherent condition of mineral aggregate at high temperature, and the temperature corresponding to maximum adhesion work((best wetting state) can be with
For determining that the best of asphalt mixes and stirs temperature, it is suitable for basis bitumen and modified bitumen.
Description of the drawings
Fig. 1：Stalagmometry schematic diagram
Fig. 2：Asphalt surface tension varies with temperature relational graph
Fig. 3：Pitch and mineral aggregate Contact-angle measurement schematic diagram
Fig. 4：30# pitches and Guangxi diabase adhesion work curve
Fig. 5：30# pitch viscosity-temperature curves
Specific implementation mode
The present invention is described in further details with reference to embodiment.
Embodiment：Content according to the present invention, specific test method are as follows：
Step 1：Determine raw material
Pitch selects Qinhuangdao 30#, 50#, 70# matrix pitch, I-D modified pitch, I-DS10 modified pitch, I-DHV4 to change
Property pitch, performance indicator such as the following table 1 of pitch；Mineral aggregate chooses Guangxi diabase, cloud sieve limestone, and performance indicator satisfaction is made
The requirement of entity project or according to《Standard specification for construction and acceptance of highway asphalt pavement》Requirement in (JTG F40-2004).
Table 1：Asphalt performance indexes
Step 2：Sample prepares
Drop of lying method requires specimen surface smooth, clean, and for mineral aggregate, this experiment is the mineral aggregate essence more than 36mm by grain size
Close cutting device is cut into the thin slice of 3mm or so thickness, is then successively processed by shot blasting successively with 400#, 600#, 1000# sand paper, throws
After light mineral aggregate surface roughness value Ra be less than 0.1 μm, convenient for pitch mineral aggregate surface sprawl and the measurement of later stage contact angle；Again
Distilled water and alcohol washes surface are used respectively, are then placed in 100 ± 5 DEG C of vacuum drying chambers and are dried 2h, are positioned over after taking-up dry
It is spare for 24 hours in dry device.
Step 3：Pitch is tested with mineral aggregate adhesion work under hot conditions
The adhesion work of pitch and mineral aggregate is calculated according to adhesion work formula 1 in surface free energy theory under hot conditions
It arrives, needs the contact angular data for measuring pitch and mineral aggregate under the surface tension of pitch at high temperature and same temperature.
(1) asphalt surface tension detection under high temperature.This experiment is based on hanging drop using DSA100 contact angle measurements (such as Fig. 1)
Law theory can immediately arrive at the surface tension of pitch by computer auto Image Collection and processing.Sessile drop method measurement surface
The basic thought of power is：When drop is by static be suspended at the nozzle of capillary, the shape of drop depend primarily on gravity and
The balance of surface tension.Therefore, pass through the measurement to droplet formation, you can extrapolate the surface tension of liquid.Pass through below
Sessile drop method tests surface tension of two kinds of pitches under different temperatures (110 DEG C~190 DEG C).Test result is as follows：
Table 2：Asphalt surface tension data
Asphalt surface tension varies with temperature relationship such as Fig. 2 (for 30# pitches).5 kinds of asphalt surface tension are in temperature
It is linear to reduce, fitting a straight line equation slope K and linearly dependent coefficient R2Such as table 4,5 kinds of asphalt surface tension vary with temperature fitting
Equation linearly dependent coefficient is all higher than 0.99.
Table 3：Asphalt surface tension varies with temperature linear equation slope K and linearly dependent coefficient R2
(2) pitch and mineral aggregate contact angle determination
This experiment using the lie test of drop method pitch and mineral aggregate (mineral aggregate test specimen processing such as step 2) contact angle such as Fig. 3, it is right
In matrix pitch, the contact angle being spaced within the scope of 110 DEG C~190 DEG C at 20 DEG C with Guangxi and cloud sieve mineral aggregate is tested；And due to
SBS modified pitch viscosity is larger, is unfavorable for the drop that drips when temperature is low, therefore tests and be spaced 10 DEG C within the scope of 140 DEG C~190 DEG C
With the contact angle of Guangxi diabase and cloud sieve two kinds of mineral aggregates of limestone.The measurement of contact angle be affected by temperature it is larger, certain thick
The relationship not too many with the roughness on mineral aggregate surface in rugosity level.Pitch and mineral aggregate are set in same test temperature by this experiment
It is tested again after the lower constant temperature 30min of degree, by DSA4 contact angle measurement automatic video recordings, computer disposal obtains after pitch drips
Stablize the contact angle of 1s.Pitch and Guangxi diabase and cloud sieve limestone contact angular data such as table 4.
Table 4：Matrix pitch and mineral aggregate contact angular data
Table 4：Modified pitch and mineral aggregate contact angular data
(3) pitch is calculated with mineral aggregate adhesion work
According to adhesion work calculation formula 1, bound bitumen surface tension and contact angle test data calculate pitch and are glued with mineral aggregate
Attached work(result such as table 5：
Table 5：Matrix pitch and mineral aggregate adhesion work data
Table 5：Modified pitch and Guangxi diabase adhesion work data
According to 5 data of table, draw pitch and Guangxi diabase adhesion work vary with temperature curve such as Fig. 4 (with 30# pitches with
For doleritic adhesion work), equally make other pitches and mineral aggregate adhesion work changes over time curve, fitting obtains curvilinear equation
And relative coefficient R2Such as the following table 6：
Table 6：Adhesion work varies with temperature curvilinear equation and relative coefficient R2
Carry out conic fitting according to pitch and mineral aggregate adhesion work curve, find out pitch and mineral aggregate adhesion work maximum value and
Corresponding temperature, data such as the following table 7：
Table 7：Pitch and mineral aggregate maximum adhesion work(and corresponding temperature data
Adhesion work can reflect liquid bitumen to mineral aggregate wetting state, in the corresponding temperature of maximum adhesion work(under the condition of high temperature
The lower pitch of degree is in best wetting state with mineral aggregate, therefore the present invention is to be used as drip with the corresponding temperature of best wetting state
Green mixture mixes and stirs temperature.
Step 4：Pitch viscosity-temperature curve is drawn, verification mixes and stirs the effective of temperature by the asphalt that wetting theory obtains
Property.
The viscosity of this 5 kinds of pitch, five temperature spot, data such as table 8 are determined using Bu Luoke Philid viscometers.With 30#
Pitch viscosity-temperature curve such as Fig. 5 is drawn for pitch.5 kinds of pitches are acquired respectively according to viscosity-temperature curve equation to mix and stir temperature (pitch is viscous
Degree is 0.17 ± 0.02PaCorresponding temperature when s) it is listed in table 9.
Table 8：Asphalt viscosity data under different temperatures
Table 9：The asphalt mixing temperature obtained by viscosity-temperature curve
It determines that the temperature of mixing and stirring of asphalt is suitable for matrix pitch by viscosity-temperature curve, and is not suitable for modified drip
Blueness, and the asphalt that the method for mixing and stirring temperature by determining asphalt proposed by the present invention for matrix pitch obtains is mixed
It is approached with the result obtained by viscosity-temperature curve with temperature；Modified pitch is mixed and stirred by determining asphalt proposed by the present invention
The asphalt that the method for temperature obtains mixes and stirs the practice of construction temperature of temperature and modified pitch more closely, illustrating the present invention
The asphalt based on wetting theory proposed mixes and stirs temperature determining method and is reasonable, is feasible.
(5) brief summary
The present invention measured respectively according to wetting theory the surface tension of pitch, pitch and mineral aggregate contact angle, and then obtain
At a high temperature of the curved line relation that varies with temperature of the adhesion work of pitch and mineral aggregate, fit curve equation acquires maximum adhesion work(, i.e.,
Pitch, can with the temperature corresponding to maximum adhesion work((best wetting state) to the best wetting coherent condition of mineral aggregate at high temperature
For determining that the best of asphalt mixes and stirs temperature, to be suitable for basis bitumen and modified bitumen.This is to determine that pitch mixes
The best mix temperature of material provides new method, for selecting suitable asphalt construction temperature to have certain guidance
Meaning.
Claims (5)
1. the asphalt based on wetting theory most preferably mixes and stirs temperature determining method, include the following steps：
(1) pitch, mineral aggregate are chosen；
(2) it measures within the scope of high-temperature temperature 100-200 degree and at interval of the adhesion work of pitch and mineral aggregate under 10-20 degree and draws adherency
Work(varies with temperature curve；
(3) curve matching curvilinear equation is varied with temperature according to adhesion work, is acquired by curvilinear equation and is dripped in hyperthermia temperature range
Green and mineral aggregate maximum adhesion work(, i.e., for pitch to the best wetting state and corresponding temperature of mineral aggregate, this temperature is asphalt
Best mix and stir temperature；
The method of the step (2) includes：
(A) asphalt surface tension detection：Based on hanging drop law theory, the asphalt surface tension under certain temperature is measured；
(B) at the same temperature, pitch and mineral aggregate contact angle are measured using drop method of lying；
(C) temperature is calculated according to adhesion work calculation formula 1 in wetting theory, bound bitumen surface tension and contact angle test data
The lower pitch of degree and mineral aggregate adhesion work；
Wsl=γl(1+cos θ) (formula 1)
In formula：
γl- surface tension of liquid, mJ/m2；
Wsl- liquid consolidates adhesion work, mJ/m2；
θ-pitch and mineral aggregate contact angle.
2. determining method according to claim 1, step (B) the pitch titration temperature regulating device and the setting of mineral aggregate thermostatic chamber
Constant temperature is carried out at the same temperature, and pitch is dripped under constant temperature in mineral aggregate surface, contact angle numerical value when droplets stable 1s is measured.
3. determining method according to claim 2, the mineral aggregate in the step (B) is the thin slice for being cut into 2-3mm thickness.
4. determining method according to claim 1, when the pitch is matrix pitch, ranging from 110 DEG C of measuring temperature~
It 190 DEG C, is spaced 20 DEG C and measures an adherency work value；When the pitch is modified pitch, measuring temperature ranging from 140 DEG C~190
DEG C, it is spaced 10 DEG C and measures an adherency work value.
5. determining method according to claim 1, the step (A) using DSA4 contact angle measurements by computer from
Motion video acquires and processing, immediately arrives at the surface tension of pitch.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109030293A (en) * | 2018-08-22 | 2018-12-18 | 武汉红金龙印务股份有限公司 | A method of box Heraeus wet concentration processed is selected |
| CN111366498B (en) * | 2020-03-30 | 2022-05-13 | 东南大学 | Method for determining optimal foaming condition of modified asphalt through viscosity |
| CN111855498B (en) * | 2020-06-24 | 2023-04-07 | 同济大学 | Asphalt mixture mixing temperature determination method based on surface energy theory |
| CN112834390B (en) * | 2020-12-31 | 2022-08-09 | 云南建投路面工程有限公司 | Method for rapidly determining mixing amount and cooling amplitude of warm mixing agent for viscosity-reduced road |
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