CN110411838A - A method of passing through stress response assay asphalt temperature sensibility - Google Patents
A method of passing through stress response assay asphalt temperature sensibility Download PDFInfo
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- CN110411838A CN110411838A CN201910803854.6A CN201910803854A CN110411838A CN 110411838 A CN110411838 A CN 110411838A CN 201910803854 A CN201910803854 A CN 201910803854A CN 110411838 A CN110411838 A CN 110411838A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
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- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of methods by stress response assay asphalt temperature sensibility, pass through pitch dynamic stress response curve in measurement wide temperature field, it determines that pitch is glutinous and plays state temperature range, so that it is determined that stress response realizes the evaluation of asphalt temperature sensibility with this in the glutinous rate of change for playing state temperature range.By experiments have shown that, stress response change rate can distinguish the temperature sensitivity of different quality pitches well, provide effective test method for the selection of asphalt material in road construction.
Description
Technical field
The present invention is a kind of asphalt temperature sensitivity evaluation method based on dynamic mechanical analysis, i.e., by measuring wide temperature
Pitch dynamic stress response curve in domain, identified sign response are dripped in the glutinous rate of change for playing state temperature range with this to realize
The evaluation of green temperature sensitivity.
Background technique
Phase transformation is the intrinsic property of amorphous state high molecular material, is that the macroscopic view of Macromolecular motion form transformation embodies,
It directly influences the service performance and processing performance of material, therefore it is all the main interior of Polymer Physics research for a long time
Hold.For amorphous polymers, apply constant power to it, observes the relationship of deformation and temperature that it occurs, commonly referred to as temperature shape
Varied curve or thermomechanical curve.There are four types of mechanical states for amorphous polymers, they are glassy state, elastomeric state, viscoelastic state and viscous state.
When temperature is lower, material is rigid solid shape, similar to glass, and very small deformation only can occur under external force, this
State is glassy state: after temperature continues to rise to a certain range, the deformation of material significantly increases, this state is as high-elastic
State；Relatively stable in subsequent certain temperature section deformation, this state is viscoelastic state；Temperature continues to increase deformation quantity again gradually
Increase, material gradually becomes the fluid of viscosity, and deformation at this time can not restore, this state is viscous state.Dynamic mechanical analysis
Method is to study the important means of viscoelastic material phase conversion, and pitch belongs to typical responsive to temperature type viscous-elastic material, is led to
Cross certain frequency in wide temperature field, the dynamic mechanical of strain scans available pitch stress variation with temperature curve, stress
The variation characteristic of response has reacted the phase transition process of pitch.
Asphalt temperature sensibility is to evaluate the important indicator of its pavement performance, and therefore, the present invention uses dynamic mechanical analysis
Method is proposed with stress response variation with temperature rate the method for evaluating asphalt temperature sensibility.
Summary of the invention
The purpose of the present invention is the test methods with dynamic mechanical to obtain the dynamic stress in pitch certain temperature range
Response curve divides curve according to material viscoelasticity theory to obtain the glutinous bullet state temperature range of pitch, plays state humidity province with glutinous
Between the change rate that responds of internal stress evaluate asphalt temperature sensibility.
Asphalt temperature sensitivity evaluation method based on dynamic mechanical analysis method, includes the following steps:
(1) asphalt sample is chosen；
(2) pitch square sheet test specimen is produced in a manner of pouring；
(3) dynamic test is carried out to asphalt test piece；
(4) Bolzmann models fitting stress-temperature curve is used, determines that pitch is glutinous and plays state temperature range；
(5) it calculates pitch and plays state temperature range dynamic stress response variation with temperature rate glutinous, in this, as evaluating this
Kind asphalt temperature sensibility index, change rate is bigger, then temperature sensitivity is bigger.
The asphalt test piece is having a size of 60 ± 2mm × 14 ± 1mm × 3 ± 0.2mm.
The dynamic test is using dynamic mechanical analyzer Dynamic M σ chanical Analyz σ r to pitch
Temperature scanning is carried out, fixture selects double cantilevers, and stress form is 3 points of curved pull-modes, the load of both ends fixed center, sweep parameter
It is as follows: scanning temperature range: -30~40 DEG C；Heating rate: 2 DEG C/min；Frequency: 1Hz；Strain: 25 μ ε.
Using Bolzmann modelIt is fitted stress-temperature curve, acquires matched curve parameter,
To obtain curve high temperature, low-temperature range stress response asymptote of curve and midpoint tangent line, midpoint tangent line and low-temperature end are gradually
Near line y=A1, temperature end asymptote y=A2The corresponding temperature of intersection point be inflection temperature, use T respectively1、T2It indicates, T1~T2
As pitch is glutinous plays state temperature range, and the corresponding stress of inflection temperature is σ1、σ2。
The stress response variation with temperature rate is σT: σT=(σ1-σ2)/(T2-T1)。
The present invention has researched and proposed the method based on dynamic mechanical analysis evaluation asphalt temperature sensibility, including test step
Suddenly, test parameters, evaluation index, by obtaining pitch stress response and varying with temperature curve with dynamic mechanical analysis method,
The glutinous bullet state temperature range of pitch is obtained using Bolzmann models fitting stress-temperature curve, is answered with glutinous play in state temperature range
Force-responsive variation with temperature rate (σT) as the index for evaluating asphalt temperature sensibility.
By experiments have shown that, stress response change rate can distinguish the temperature sensitivity of different quality pitches well, right
The selection of asphalt material provides effective test method in road construction.
Detailed description of the invention
Fig. 1 mold diagram,
Fig. 2 asphalt test piece thin slice,
Fig. 3 stress response varies with temperature curve (A30),
Fig. 4 stress rate and penetration index PI relation curve.
Specific embodiment
Below with reference to example, the present invention is described in further detail.
Embodiment 1
Content according to the present invention, specific implementation step are as follows:
Step 1: pitch is chosen,
Pitch selects tri- kinds of matrix pitches of A30, A50, A70, performance indicator such as the following table 1；
Table 1: asphalt performance indexes
Step 2: pressing test requirements document, asphalt test piece is produced in a manner of pouring
Then die trial will as shown in Figure 1, first clean up die trial, and interleaving agent is applied to die trial side and bottom surface
It is uniformly slowly injected into mould according to the bitumen samples that method as defined in standard schedule prepares, finally slightly higher than die trial, when pouring not
Bubble must be made to be mixed into；Cooling is no less than 0.5h to test specimen after the completion of pouring at room temperature, is then struck off with hot scraper and is higher by die trial
Pitch, flush bituminous sheaths with die trial face；Then it takes out after sample being put into refrigerator cooling 20min, then tears mold open
It removes, takes out asphalt test piece, be placed on clean sheet glass, it is spare to be placed again into cooling in refrigerator.Bitumen samples having a size of 60 ±
2mm × 14 ± 1mm × 3 ± 0.2mm, as shown in Figure 2.
Step 3: pitch dynamic test
The present invention analyzes pitch using dynamic mechanical analyzer, and test parameters is as shown in table 2
2 dynamic mechanical sweep parameter of table
| Scan temperature range | Heating rate/(DEG C/min) | Frequency/Hz | Strain/× 106 |
| - 30~40 DEG C | 2 | 1 | 25 |
Dynamic test is carried out to pitch according to test parameters in table, the pitch stress response obtained by temperature scanning is bent
Line chart is as shown in Figure 3 (by taking A30 pitch as an example).
Stress response represents the size of material required power when reaching certain deformation, the spy that stress response varies with temperature
Sign reflects the viscous-elastic behaviour of pitch at different temperatures, the pitch stress response scanned by dynamic mechanical with temperature change
It is as shown in Figure 3 to change curve.As seen from Figure 3, stress response is in inverse S-curve variation relation with the raising of temperature.
Step 4: determining the high-elastic service state temperature range of pitch
The stress response curve obtained according to step 3 is fitted using Bolzmann models fitting stress response curve
Equation parameter, to obtain stress curve in high temperature section asymptote: y=A2, low-temperature range asymptote: y=A1, midpoint coordinates
(x0, (A1+A2)/2), tangent slope k=(A2-A1)/4dx, midpoint tangent line and low-temperature end asymptote y=A1, temperature end asymptote
Y=A2The corresponding temperature of intersection point be inflection temperature, respectively by T1、T2It indicates, T1~T2As pitch is glutinous plays state temperature range,
The corresponding stress of inflection temperature is σ1、σ2。
Pitch high/low temperature inflection point is calculated in three kinds of pitch stress response curve Bolzmann fitting parameter data of the invention
Temperature and corresponding stress are as shown in table 3.
3 pitch step transition temperature of table and corresponding stress data
Step 6: calculating pitch glutinous and play state temperature range stress response variation with temperature rate
According to step 4 data, three kinds of pitches are calculated glutinous and play state temperature range (T2-T1) and stress response with temperature
Change rate σT, σT=(σ1-σ2)/(T2-T1), stress rate is bigger, and temperature sensitivity is bigger, in this, as this drip of evaluation
The index of green temperature sensitivity.Meanwhile penetration index PI is calculated according to the penetration values under pitch different temperatures.
Three kinds of pitch stress response variation with temperature rates and penetration index PI data such as 4 institute of table that the present invention chooses
Show, stress rate is made according to table 4 and penetration index PI relation curve is as shown in Figure 4.
4 pitch stress response change rate data of table
| Pitch | Stress rate/mN+℃-1 | Penetration index PI |
| A30 | 7.04 | 0.93 |
| A50 | 9.06 | 0.40 |
| A70 | 11.43 | 0.07 |
By test data and Fig. 4 in table 4 it is found that three kinds of pitch stress rate A70 > A50 > A30, i.e. matrix pitch A70
Temperature sensitivity is maximum, and A30 temperature sensitivity is minimum；Three kinds of asphalt penetration index PI A30 > A50 > A70, are referred to by needle penetration
Asphalt temperature sensibility A70 > A50 > A30 that number evaluation obtains, two kinds consistent with the method for the present invention evaluation result, and the two exists
Linear relationship, relative coefficient are greater than 0.96, show the validity of the method for the present invention evaluation asphalt temperature sensibility.
Claims (5)
1. the asphalt temperature sensitivity evaluation method based on dynamic mechanical analysis method, includes the following steps:
(1) asphalt sample is chosen；
(2) pitch square sheet test specimen is produced in a manner of pouring；
(3) dynamic test is carried out to asphalt test piece；
(4) Bolzmann models fitting stress-temperature curve is used, determines that pitch is glutinous and plays state temperature range；
(5) it calculates pitch and plays state temperature range dynamic stress response variation with temperature rate glutinous, in this, as this drip of evaluation
Green temperature sensitivity index, change rate is bigger, then temperature sensitivity is bigger.
2. evaluation method according to claim 1, the asphalt test piece having a size of 60 ± 2mm × 14 ± 1mm × 3 ±
0.2mm。
3. evaluation method according to claim 2, the dynamic test is using dynamic mechanical analyzer Dynamic
M σ chanical Analyz σ r carries out temperature scanning to pitch, and fixture selects double cantilevers, and stress form is 3 points of curved pull-modes,
The load of both ends fixed center, sweep parameter are as follows: scanning temperature range: -30~40 DEG C；Heating rate: 2 DEG C/min；Frequency:
1Hz；Strain: 25 μ ε.
4. evaluation method according to claim 3, using Bolzmann modelIt is fitted stress-
Temperature curve acquires matched curve parameter, thus obtain curve high temperature, low-temperature range stress response asymptote of curve and in
Point tangent line, midpoint tangent line and low-temperature end asymptote y=A1, temperature end asymptote y=A2The corresponding temperature of intersection point be inflection point temperature
Degree, uses T respectively1、T2It indicates, T1~T2As pitch is glutinous plays state temperature range, and the corresponding stress of inflection temperature is σ1、σ2。
5. evaluation method according to claim 4, the stress response variation with temperature rate is σT: σT=(σ1-σ2)/
(T2-T1)。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235890A (en) * | 2021-12-17 | 2022-03-25 | 哈尔滨工业大学 | Asphalt time-temperature sensitivity testing and evaluating method based on dissipation energy change |
| CN115931562A (en) * | 2022-12-22 | 2023-04-07 | 山东高速集团有限公司创新研究院 | Method for rapidly evaluating workability of asphalt mixture |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114235890A (en) * | 2021-12-17 | 2022-03-25 | 哈尔滨工业大学 | Asphalt time-temperature sensitivity testing and evaluating method based on dissipation energy change |
| CN115931562A (en) * | 2022-12-22 | 2023-04-07 | 山东高速集团有限公司创新研究院 | Method for rapidly evaluating workability of asphalt mixture |
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