CN104777288B - Method for measuring SBS content in SBS modified asphalts by virtue of DSR - Google Patents
Method for measuring SBS content in SBS modified asphalts by virtue of DSR Download PDFInfo
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- CN104777288B CN104777288B CN201510169262.5A CN201510169262A CN104777288B CN 104777288 B CN104777288 B CN 104777288B CN 201510169262 A CN201510169262 A CN 201510169262A CN 104777288 B CN104777288 B CN 104777288B
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Abstract
The invention discloses a method for measuring an SBS content in SBS modified asphalts by virtue of a dynamic shear rheometer (DSR). The method is carried out according to the following steps: configuring a series of modified asphalts with different SBS admixture amounts and a standard SBS content, and carrying out an RTFOT ageing experiment; then carrying out a repeated creep recovery experiment by virtue of the DSR to form a creep recovery graph; calculating the average value Jnr@sigma of a plurality of circulating unrecoverable creep compliances of the modified asphalt RTFOT ageing samples with the various SBS admixture amounts, and the average value Rec@sigma of elastic recovery rates; drawing a Jnr@sigma content curve and a Rec@sigma-SBS content curve; carrying out the RTFOT ageing experiment and the repeated creep recovery experiment on the SBS content to be measured to obtain the unrecoverable creep compliances Jnr@sigma and the elastic recovery rates Rec@sigma of the test samples; and reading the SBS contents CJ and CR on the content curves, wherein the SBS content of the test samples is (CJ+CR)/2. The method is simple to operate, high in applicability, and accurate and reliable in test result.
Description
Technical field
The present invention relates to field of bitumen technology is and in particular to a kind of utilization dsr measures sbs content in sbs modified pitch
Method.
Background technology
In recent years, in highway in China asphalt pavement construction, Modified Bitumen Pavement proportion continues to increase.Sbs is with respect to it
His modifying agent (as pe, eva, sbr etc.), the aspects such as high and low temperature performance, elastic recovery capability, response to temperature improvement result all
There is obvious advantage, therefore China's road modified asphalt is based on sbs modified pitch.With the depth to modified pitch both at home and abroad
Enter research, the mechanism of modification of sbs modified pitch, modified technique, Effect of Materials factor, pavement performance impact etc. are achieved with grinding in a large number
Study carefully achievement, result shows that sbs modifier content is closely related with the pavement performance of sbs Modified Bitumen Pavement and service life, but
The conventional index (needle penetration, softening point, ductility etc.) of sbs modified pitch but cannot characterize or reflect modifying agent sbs content.
The detection technique means of the sbs modifier content developed have infrared spectroscopy, gpc method, current potential to drip
Determine method etc..The testing agency of general transportation industry there is no that infrared spectrum, gpc measure adopted instrument and equipment, relatively
Difficulty possesses coherent detection condition；And although potentiometric titration instrument is simple, the method is affected by human factors larger, adds drip
Blue or green solution is often black, and volumetric soiutions and iodine are in that Immiscible Polymer Blends make drop reaction slow and terminal colour change is not clear
Aobvious, have impact on the accuracy of test result.It is therefore desirable to developing a kind of utilizing in highway asphalt detection and research industry now
There are instrument and method simple to operate, to automatically control ability and the high detection sbs modifier content of the suitability, to improve modified drip
The appraisement system of blue or green quality, strengthens the quality control of modified pitch.
Dynamic shear rheometer (abbreviation dsr), is the underlying instrument of research viscoelastic material, Colophonium can be evaluated using dsr
The high-temperature behavior of binder, middle low temperature fatigue property, and this instrument is used widely in Colophonium and asphalt.When
When power (or shear stress) is loaded on Colophonium by rotary shaft, dsr will measure the power that Colophonium applies to this reaction (or cut should
Become).At a temperature of traffic is born on most of road surfaces, not only as elastic solid (Hookean body) but also as viscous liquid, dsr test can quantify should for Colophonium
Relation between power and strain, characterizes the resistance capacity to deformation of modified pitch using rheol index g*/sin δ；And repeat compacted
Become recover experiment can preferably development of deformation process under Driving Loading for the simulated roadway, consider modified pitch simultaneously
Delayed elasticity, embody the non-deformability under modified pitch high temperature again.
Content of the invention
The present invention provides a kind of method that utilization dsr measures sbs content in sbs modified pitch, and the method is simple to operate, certainly
Dynamic control ability is strong, and the suitability is high, and test result is accurately and reliably.
For achieving the above object, the present invention employs the following technical solutions:
A kind of method that utilization dsr measures sbs content in sbs modified pitch, sequentially includes the following steps:
(1) configure a series of different standard sbs content modified pitch of sbs volumes；
(2) rtfot senile experiment: Colophonium is simulated to this series standard concentration sbs modified pitch and mixes and stirs aging rotation
Turn thin film oven experiment；
(3) repeated creep recover experiment: take the aging sample of above rtfot be respectively adopted dynamic shear rheometer enter trip temperature t,
Repeated creep under stress σ recovers experiment, σ stress loading time a carry out creep, unload into zero stress time b carry out deforming extensive
Retrial is tested, and repeats n circulation, collects data, forms creep and recovers figure；
(4) calculate the irrecoverable compacted of each circulation of the aging sample of various sbs modified pitch rtfot according to test result analysis
Become compliance jnr and elastic restoration ratio rec；
(5) meansigma methodss taking the non-recoverable creep compliance of n circulation again are designated as jnr@σ, the meansigma methodss of elastic restoration ratio
It is designated as rec@σ；
(6) with sbs content as abscissa, jnr@σ is vertical coordinate, draws and obtains jnr@σ sbs content curve；Contained with sbs
Measure as abscissa, rec@σ is vertical coordinate, draws and obtains rec@σ sbs content curve；
(7) determine the sbs content of sbs modified pitch sample
1. sbs modified pitch sample is carried out above-mentioned rtfot senile experiment and repeated creep recovers experiment, obtain sample
Non-recoverable creep compliance jnr@σ, elastic restoration ratio rec@σ；
2. the jnr@σ value according to sample reads sbs content c on jnr@σ sbs content curvej；Rec@according to sample
M value reads sbs content c on rec@m sbs content curver；
3. sbs content c of sample is (cj+cr)/2.
Preferably, in step (3), temperature t is 70 DEG C, and stress σ is 3.2kpa.
Preferably, the different standard sbs content modified pitch of serial sbs volume is: sbs volume be 0%, 1.0%,
2.0%th, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0% standard sbs content modified pitch.
Preferably, in step (3), time a is 1s, and time b is 9s.
Preferably, period n of described repetition is 10.
After technique scheme, the present invention, compared with existing background technology, has the advantage that
Dynamic shear rheometer is one of testing equipment in highway asphalt detection and research industry, and instrument automatically controls energy
Power is strong and simple to operate；After Specification Curve of Increasing, can quickly measure sbs content, the wide (0- of applicable sbs content detection scope
6%), and test result accurately and reliably, the method can be used for improving the appraisement system of sbs modified pitch quality, strengthens sbs modified
The quality control of Colophonium.
Brief description
Fig. 1 is that the creep of the sbs modified pitch of a certain sbs content under 3.2kpa stress recovers figure；
Fig. 2 is jnr@3.2kpa sbs content curve chart；
Fig. 3 is rec@3.2kpa sbs content curve chart.
Specific embodiment
Some embodiments of the present invention presented below, to help further understanding the present invention, but protection scope of the present invention
It is not limited in these embodiments.
The invention discloses a kind of method that utilization dsr measures sbs content in sbs modified pitch, sequentially include the following steps:
(1) take No. 70 Colophoniumes of esso (Esso) configuration sbs volumes to be 0%, 1.0%, 2.0%, 2.5%, 3.0%,
3.5%th, 4.0%, 4.5%, 5.0%, 5.5%, 6.0% normal concentration sbs modified pitch；
(2) rtfot senile experiment: Colophonium is simulated to this series standard concentration sbs modified pitch and mixes and stirs aging rotation
Turn thin film oven experiment (rtfot)；
(3) repeated creep recover experiment: take the aging sample of above rtfot be respectively adopted dynamic shear rheometer carry out 70 DEG C,
Repeated creep under 3.2kpa stress recovers experiment, and 3.2kpa stress loading 1s carries out creep, unloads into zero stress 9s and become
Shape recovers test, and repeats 10 circulations, collects data, forms creep and recovers figure, with reference to Fig. 1.Fig. 1 shows a certain
The creep of sbs content modified pitch recovers figure, wherein, εr1 is circulation 1 recoverable shear strain, εnr1 is that circulation 1 is irrecoverable
Shear strain；εr7 is circulation 7 recoverable shear strains, εnr7 is circulation 7 non-recoverable shear strain；
(4) calculate the irrecoverable compacted of each circulation of the aging sample of various sbs modified pitch rtfot according to test result analysis
Become compliance jnr and elastic restoration ratio rec, computing formula is as follows；
Wherein: loading stress is 3.2kpa, the non-recoverable shear strain of each circulation, the strain of instantaneous maximum shear are passed through
The digital independent function of the test software of dynamic shear rheometer, can get data.
(5) meansigma methodss taking the non-recoverable creep compliances of 10 circulations again are designated as jnr@3.2kpa, elastic restoration ratio
Meansigma methodss are designated as rec@3.2kpa；Obtain the data of table one.
The jnr@3.2kpa and rec@3.2kpa value of table series of standards concentration sbs modified pitch
| Sbs content | jnr@3.2kpa | rec@3.2kpa |
| 0 | 7.55 | 0.07 |
| 1.0% | 5.67 | 1.32 |
| 2.0% | 3.68 | 11.65 |
| 2.5% | 2.65 | 20.87 |
| 3.0% | 1.65 | 42.01 |
| 3.5% | 0.81 | 68.52 |
| 4.0% | 0.32 | 80.91 |
| 4.5% | 0.13 | 87.29 |
| 5.0% | 0.065 | 90.93 |
| 5.5% | 0.041 | 92.42 |
| 6.0% | 0.027 | 93.11 |
(6) with sbs content as abscissa, jnr@3.2kpa is vertical coordinate, draws and obtains jnr@3.2kpa sbs content song
Line, as shown in Figure 2；With sbs content as abscissa, rec@3.2kpa is vertical coordinate, draws and obtains rec@3.2kpa sbs content
Curve, as shown in Figure 3；
(7) determine the sbs content of sbs modified pitch sample
1. sbs modified pitch sample is carried out above-mentioned rtfot senile experiment and repeated creep recovers experiment, obtain sample
Non-recoverable creep compliance jnr@3.2kpa, elastic restoration ratio rec@3.2kpa；
2. the jnr@3.2kpa value according to sample reads sbs content c on jnr@3.2kpa sbs content curvej；According to
The rec@3.2kpa value of sample reads sbs content c on rec@3.2kpa sbs content curver；
3. sbs content c of sample is (cj+cr)/2.
The present embodiment modified drip of sbs that sbs (trade mark 791h) content is 2.7% and 5.2% that takes esso 70# Colophonium to prepare
Green grass or young crops, is analyzed by above step, obtains table two:
Table two sample testing data result
By table two it can also be seen that, after Specification Curve of Increasing, can quickly measure sbs content, applicable sbs content detection model
Enclose wide (0-6%), and test result is accurately and reliably.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to above-described embodiment
Limit, other any spirit without departing from the present invention and the change made under principle, modification, replacement, combine, simplify,
All should be equivalent substitute mode, be included within protection scope of the present invention.
Claims (5)
1. a kind of method that utilization dsr measures sbs content in sbs modified pitch, is characterized in that: sequentially include the following steps:
(1) configure a series of different standard sbs content modified pitch of sbs volumes；
(2) rtfot senile experiment: Colophonium is simulated to this series standard sbs content modified pitch and mixes and stirs aging Rotational Thin
Film baking oven is tested；
(3) repeated creep recovers experiment: takes the aging sample of above rtfot to be respectively adopted dynamic shear rheometer and enters trip temperature t, stress
Repeated creep under σ recovers experiment, and σ stress loading time a carries out creep, unloads into zero stress time b and carry out recoverable force examination
Test, and repeat n circulation, collect data, form creep and recover figure；
(4) soft according to the non-recoverable creep of test result analysis calculating each circulation of the aging sample of various sbs modified pitch rtfot
Amount jnr and elastic restoration ratio rec；
(5) take again n circulation non-recoverable creep compliance meansigma methodss be designated as jnr@σ, the meansigma methodss of elastic restoration ratio are designated as
rec@σ；
(6) with sbs content as abscissa, jnr@σ is vertical coordinate, draws and obtains jnr@σ sbs content curve；With sbs content it is
Abscissa, rec@σ is vertical coordinate, draws and obtains rec@σ sbs content curve；
(7) determine the sbs content of sbs modified pitch sample
1. sbs modified pitch sample is carried out above-mentioned rtfot senile experiment and repeated creep and recover experiment, obtain sample can not
Recover creep compliance jnr@σ, elastic restoration ratio rec@σ；
2. the jnr@σ value according to sample reads sbs content c on jnr@σ sbs content curvej；Existed according to the rec@σ value of sample
Sbs content c is read on rec@σ sbs content curver；
3. sbs content c of sample is (cj+cr)/2.
2. the method that a kind of utilization dsr according to claim 1 measures sbs content in sbs modified pitch, is characterized in that:
In step (3), temperature t is 70 DEG C, and stress σ is 3.2kpa.
3. the method that a kind of utilization dsr according to claim 2 measures sbs content in sbs modified pitch, is characterized in that:
The different standard sbs content modified pitch of serial sbs volume is: sbs volume be 0%, 1.0%, 2.0%, 2.5%, 3.0%,
3.5%th, 4.0%, 4.5%, 5.0%, 5.5%, 6.0% normal concentration sbs modified pitch.
4. the method that a kind of utilization dsr according to claim 3 measures sbs content in sbs modified pitch, is characterized in that:
In step (3), time a is 1s, and time b is 9s.
5. the method that a kind of utilization dsr according to claim 4 measures sbs content in sbs modified pitch, is characterized in that:
Period n of described repetition is 10.
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| CN108426992A (en) * | 2018-04-23 | 2018-08-21 | 中石化石油工程技术服务有限公司 | A kind of method of insoluble high molecular polymerization species solid content in measurement modified pitch |
| CN109709262A (en) * | 2019-02-12 | 2019-05-03 | 长沙理工大学 | Polymer modified asphalt aging evaluation method based on constant-current titration |
| CN111982654B (en) * | 2020-08-20 | 2021-06-29 | 中国核工业中原建设有限公司 | Asphalt mortar multiple stress creep curve analysis method based on road intersection driving behavior combination |
| CN114264526A (en) * | 2021-12-22 | 2022-04-01 | 厦门华特公路沥青技术有限公司 | Method for measuring shear deformation resistance of sand type mixture |
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| CN101949858B (en) * | 2010-09-07 | 2012-02-01 | 长安大学 | Test method of doping quantity of modifier in SBS modified asphalt |
| CN102507386A (en) * | 2011-11-10 | 2012-06-20 | 长安大学 | Method for measuring modifier content in SBS modified asphalt through adopting Brookfield rotary viscometric method |
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