CN104777288A - 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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- CN104777288A CN104777288A CN201510169262.5A CN201510169262A CN104777288A CN 104777288 A CN104777288 A CN 104777288A CN 201510169262 A CN201510169262 A CN 201510169262A CN 104777288 A CN104777288 A CN 104777288A
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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, be specifically related to a kind of method utilizing DSR to measure SBS content in SBS modified bitumen.
Background technology
In recent years, in highway in China asphalt pavement construction, Modified Bitumen Pavement proportion continues to increase.SBS is relative to other modifier (as PE, EVA, SBR etc.), and the improvement result in high and low temperature performance, elastic recovery capability, response to temperature etc. has obvious advantage, and therefore China's road modified asphalt is based on SBS modified bitumen.Along with domestic and international to the further investigation of modified bitumen, the mechanism of modification, modified technique, Effect of Materials factor, pavement performance impact etc. of SBS modified bitumen have obtained lot of research, result show the pavement performance of SBS modifier content and SBS Modified Bitumen Pavement and serviceable life closely related, but the conventional index of SBS modified bitumen (pen., softening point, ductility etc.) cannot characterize or reflect modifier SBS content.
The detection technique means of the SBS modifier content now developed have infrared spectroscopy, GPC method, potentiometric titration etc.The testing agency of general transportation industry there is no that infrared spectrum, GPC measure the instrument and equipment adopted, and more difficult possess coherent detection condition; And although potentiometric titration instrument is simple, but the method is affected by human factors larger, add cold primer-oil black often, and volumetric soiutions and iodine are in Immiscible Polymer Blends makes drop reaction slow and terminal colour changes not obvious, have impact on the accuracy of test result.Therefore be necessary to develop and a kind ofly utilize highway asphalt to detect and the method for existing instrument and simple to operate, automatic control ability and the high detection SBS modifier content of applicability in research industry, to improve the appraisement system of modified bitumen quality, strengthen the quality control of modified bitumen.
Dynamic shear rheometer (being called for short DSR) is the underlying instrument of research viscoelastic material, adopt DSR can evaluate the high-temperature behavior of asphaltic binder, middle low temperature fatigue property, and this instrument is used widely in pitch and asphalt.When power (or shear stress) is loaded on pitch by turning axle, DSR will measure the reaction (or shearing strain) of pitch to the power that this applies.Under traffic temperature is born on most of road surface, pitch is not only as elastic solid (Hookean body) but also as viscous liquid, and DSR tests the relation that can quantize between stress and strain, utilizes rheol index G*/sin δ to characterize the resistance capacity to deformation of modified bitumen; And repeated creep recover experiment can the development of deformation process of simulate road surface under Driving Loading, consider the delayed elasticity of modified bitumen simultaneously, embody again the non-deformability under modified bitumen high temperature.
Summary of the invention
The invention provides a kind of method utilizing DSR to measure SBS content in SBS modified bitumen, the method control ability simple to operate, automatic is strong, and applicability is high, and test result accurately and reliably.
For achieving the above object, the present invention is by the following technical solutions:
Utilize DSR to measure a method for SBS content in SBS modified bitumen, carry out according to the following steps:
(1) the standard SBS content modified bitumen that a series of SBS volume is different is configured;
(2) RTFOT senile experiment: this series standard concentration SBS modified bitumen is carried out simulating pitch and mixes and stirs aging rotary thin film in drying oven experiment;
(3) repeated creep recovers experiment: get the repeated creep that the aging sample of above RTFOT adopts dynamic shear rheometer to carry out under temperature T, stress σ respectively and recover experiment, σ stress loading time a carries out creep, unload into zero stress time b carries out recoverable force test, and repeat n circulation, collect data, form creep and recover figure;
(4) non-recoverable creep compliance Jnr and the elastic restoration ratio Rec of each circulation of the aging sample of various SBS modified bitumen RTFOT is calculated according to test result analysis;
(5) mean value getting the non-recoverable creep compliance of n circulation is again designated as Jnr@σ, the mean value of elastic restoration ratio is designated as Rec@σ;
(6) with SBS content for horizontal ordinate, Jnr σ is ordinate, draws and obtains Jnr σ-SBS containing discharge curve; With SBS content for horizontal ordinate, Rec σ is ordinate, draws and obtains Rec σ-SBS containing discharge curve;
(7) the SBS content of SBS modified bitumen sample is determined
1. SBS modified bitumen sample is carried out above-mentioned RTFOT senile experiment and repeated creep recovery experiment, obtain the non-recoverable creep compliance Jnr@σ of sample, elastic restoration ratio Rec@σ;
2. SBS content C is read at Jnr σ-SBS containing on discharge curve according to the Jnr σ value of sample
j; Rec M value according to sample reads SBS content C at Rec M-SBS containing on discharge curve
r;
3. the SBS content C of sample is (C
j+ C
r)/2.
Preferably, in step (3), temperature T is 70 DEG C, and stress σ is 3.2KPa.
Preferably, the standard SBS content modified bitumen that serial SBS volume is different is: SBS volume is the standard SBS content modified bitumen of 0%, 1.0%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0%.
Preferably, in step (3), time a is 1s, and time b is 9s.
Preferably, the period n of described repetition is 10.
After adopting technique scheme, the present invention is compared with existing background technology, and tool has the following advantages:
Dynamic shear rheometer is that highway asphalt detects and one of checkout equipment in research industry, and the automatic control ability of instrument is strong and simple to operate; When after Specification Curve of Increasing, can Fast Measurement SBS content, be suitable for SBS content detection scope wide (0-6%), and test result is accurately and reliably, the method can be used for the appraisement system improving SBS modified bitumen quality, strengthens the quality control of SBS modified bitumen.
Accompanying drawing explanation
Fig. 1 is the creep recovery figure of the SBS modified bitumen of a certain SBS content under 3.2KPa stress;
Fig. 2 is Jnr@3.2KPa-SBS content curve map;
Fig. 3 is Rec@3.2KPa-SBS content curve map.
Embodiment
Below provide some embodiments of the present invention, to help understanding the present invention further, but protection scope of the present invention is not limited in these embodiments.
The invention discloses a kind of method utilizing DSR to measure SBS content in SBS modified bitumen, carry out according to the following steps:
(1) the normal concentration SBS modified bitumen that ESSO (Esso) No. 70 pitch configuration SBS volumes are 0%, 1.0%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0% is got;
(2) RTFOT senile experiment: this series standard concentration SBS modified bitumen is carried out simulating pitch and mixes and stirs aging rotary thin film in drying oven experiment (RTFOT);
(3) repeated creep recovers experiment: get the aging sample of above RTFOT and adopt that dynamic shear rheometer carries out 70 DEG C, repeated creep under 3.2KPa stress recovers experiment respectively, 3.2KPa stress loading 1s carries out creep, unload into zero stress 9s carries out recoverable force test, and repeat 10 circulations, collect data, form creep and recover figure, with reference to figure 1.Fig. 1 shows the creep recovery figure of a certain SBS content modified bitumen, wherein, and ε
r1 is circulation 1 recoverable shear strain, ε
nr1 is the strain of circulation 1 non-recoverable shear; ε
r7 is circulation 7 recoverable shear strain, ε
nr7 is the strain of circulation 7 non-recoverable shear;
(4) calculate non-recoverable creep compliance Jnr and the elastic restoration ratio Rec of each circulation of the aging sample of various SBS modified bitumen RTFOT according to test result analysis, 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, by the digital independent function of the testing software of dynamic shear rheometer, can obtain data.
(5) mean value getting the non-recoverable creep compliance of 10 circulations is again designated as Jnr@3.2KPa, the mean value of elastic restoration ratio is designated as Rec@3.2KPa; Obtain the data of table one.
The Jnr@3.2KPa of table series of standards concentration SBS modified bitumen and Rec@3.2KPa value
| 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 for horizontal ordinate, Jnr 3.2KPa is ordinate, draws and obtains Jnr 3.2KPa-SBS containing discharge curve, as shown in Figure 2; With SBS content for horizontal ordinate, Rec 3.2KPa is ordinate, draws and obtains Rec 3.2KPa-SBS containing discharge curve, as shown in Figure 3;
(7) the SBS content of SBS modified bitumen sample is determined
1. SBS modified bitumen sample is carried out above-mentioned RTFOT senile experiment and repeated creep recovery experiment, obtain the non-recoverable creep compliance Jnr@3.2KPa of sample, elastic restoration ratio Rec@3.2KPa;
2. SBS content C is read at Jnr 3.2KPa-SBS containing on discharge curve according to the Jnr 3.2KPa value of sample
j; Rec 3.2KPa value according to sample reads SBS content C at Rec 3.2KPa-SBS containing on discharge curve
r;
3. the SBS content C of sample is (C
j+ C
r)/2.
The present embodiment is got ESSO 70# pitch and is prepared the SBS modified bitumen that SBS (trade mark 791H) content is 2.7% and 5.2%, analyzes, obtain table two by above step:
Table two sample testing data result
Also can be found out by table two, when after Specification Curve of Increasing, can Fast Measurement SBS content, be suitable for SBS content detection scope wide (0-6%), and test result is accurately and reliably.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. utilize DSR to measure a method for SBS content in SBS modified bitumen, it is characterized in that: carry out according to the following steps:
(1) the standard SBS content modified bitumen that a series of SBS volume is different is configured;
(2) RTFOT senile experiment: this series standard SBS content modified bitumen is carried out simulating pitch and mixes and stirs aging rotary thin film in drying oven experiment;
(3) repeated creep recovers experiment: get the repeated creep that the aging sample of above RTFOT adopts dynamic shear rheometer to carry out under temperature T, stress σ respectively and recover experiment, σ stress loading time a carries out creep, unload into zero stress time b carries out recoverable force test, and repeat n circulation, collect data, form creep and recover figure;
(4) non-recoverable creep compliance Jnr and the elastic restoration ratio Rec of each circulation of the aging sample of various SBS modified bitumen RTFOT is calculated according to test result analysis;
(5) mean value getting the non-recoverable creep compliance of n circulation is again designated as Jnr@σ, the mean value of elastic restoration ratio is designated as Rec@σ;
(6) with SBS content for horizontal ordinate, Jnr σ is ordinate, draws and obtains Jnr σ-SBS containing discharge curve; With SBS content for horizontal ordinate, Rec σ is ordinate, draws and obtains Rec σ-SBS containing discharge curve;
(7) the SBS content of SBS modified bitumen sample is determined
1. SBS modified bitumen sample is carried out above-mentioned RTFOT senile experiment and repeated creep recovery experiment, obtain the non-recoverable creep compliance Jnr@σ of sample, elastic restoration ratio Rec@σ;
2. SBS content C is read at Jnr σ-SBS containing on discharge curve according to the Jnr σ value of sample
j; Rec σ value according to sample reads SBS content C at Rec σ-SBS containing on discharge curve
r;
3. the SBS content C of sample is (C
j+ C
r)/2.
2. a kind of method utilizing DSR to measure SBS content in SBS modified bitumen according to claim 1, it is characterized in that: in step (3), temperature T is 70 DEG C, and stress σ is 3.2KPa.
3. a kind of method utilizing DSR to measure SBS content in SBS modified bitumen according to claim 2, is characterized in that: the different standard SBS content modified bitumen of serial SBS volume is: SBS volume is the normal concentration SBS modified bitumen of 0%, 1.0%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0%.
4. a kind of method utilizing DSR to measure SBS content in SBS modified bitumen according to claim 3, it is characterized in that: in step (3), time a is 1s, and time b is 9s.
5. a kind of method utilizing DSR to measure SBS content in SBS modified bitumen according to claim 4, is characterized in that: the period n of described repetition is 10.
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Cited By (5)
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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 |
| CN111982654A (en) * | 2020-08-20 | 2020-11-24 | 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525607A (en) * | 2016-10-26 | 2017-03-22 | 湖南中大建设工程检测技术有限公司 | Method for determining maximum ratio of filler/asphalt of asphalt mortar |
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| 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 |
| CN111982654A (en) * | 2020-08-20 | 2020-11-24 | 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 |
| 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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