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SBS modified asphalt construction temperature determination method

A technology for temperature measurement and modification of asphalt, applied in thermometers, thermometers based on physical/chemical changes, flow characteristics, etc. The effect of reducing the construction temperature of the asphalt, the simple and reliable operation method, and the effect of good engineering practice

Inactive Publication Date: 2017-04-05
SHANDONG TRANSPORTATION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This equal-viscosity standard is very low. Using this standard method, the construction temperature of SBS asphalt is too high, which is higher than the empirical temperature value in actual engineering applications; it is also higher than the thermal degradation temperature of SBS modifier. Under this construction temperature, SBS asphalt is easy to degrade, resulting in a decrease in viscosity, which is not conducive to the improvement of performance
At the same time, within the limited speed range of the rotational viscometer, relying solely on frequency changes and continuing to use the isoviscosity rules of 0.17Pa·s and 0.28Pa·s has great misunderstanding and inapplicability

Method used

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  • SBS modified asphalt construction temperature determination method
  • SBS modified asphalt construction temperature determination method
  • SBS modified asphalt construction temperature determination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 (1-D grade SBS135 modified asphalt is selected as the asphalt binder)

[0027] Determination steps:

[0028] A. According to the T0601 and T0602 standard methods in JTG E20-2011 "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering", the 1-D grade SBS modified asphalt was sampled and the asphalt sample was prepared.

[0029] B. According to T0625 "asphalt rotational viscosity test" in JTG E20-2011 "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering", the sample is prepared in the viscosity sample bottle. Then, using a rotational viscometer, using a No. 27 rotor, at a speed of 100 RPM, the viscosity values ​​of the modified asphalt at 135°C and 174°C were collected. The obtained viscosity values ​​are shown in Table 1.

[0030] Table 1 Temperature and corresponding viscosity values ​​of asphalt samples

[0031]

[0032] C. Take the temperature as the abscissa, and the logarithm of the viscosity as the ordinate, dr...

Embodiment 2

[0035] Embodiment 2 (the SBS104 modified asphalt viscosity that asphalt binder selects is slightly lower)

[0036] Measuring procedure is identical with embodiment one, utilizes the viscosity data that rotational viscometer detects to obtain as shown in table 2, and viscosity-temperature curve and construction temperature are determined as follows figure 2 shown.

[0037] Table 2 Temperature and corresponding viscosity value of asphalt samples

[0038]

[0039] From figure 2 It can be seen from the figure that the construction temperature of sample 2 modified asphalt is: the mixing temperature is 174°C, and the compaction temperature is 158°C.

Embodiment 3

[0040] Embodiment 3 (asphalt binder selects 1-D grade SBS115 modified asphalt)

[0041] The measurement procedure is the same as that of Example 1, and the viscosity data obtained by utilizing the rotational viscometer to detect is as shown in Table 3, and the viscosity-temperature curve and construction temperature are determined as follows: image 3 shown.

[0042] Table 3 Temperature and corresponding viscosity values ​​of asphalt samples

[0043]

[0044] From image 3 It can be seen from the figure that the construction temperature of sample 3 modified asphalt is: the mixing temperature is 176°C, and the compaction temperature is 160°C.

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Abstract

The invention discloses a SBS modified asphalt construction temperature determination method and belongs to the field of road engineering. The method comprises the following steps: A, by the utilization of a rotational viscometer, by the adoption of a No. 27 rotor and at the revolving speed of 100 RPM, viscosity number of a SBS modified asphalt sample used in engineering practice is acquired at 135 DEG C and at 174DEG C; B, a relation curve of logarithmic viscosity and temperature is drawn; and C, with the temperature corresponding to 0.275 Pa.s as a mixing temperature and with the temperature corresponding to 0.55 Pa.s as a compaction temperature, corresponding mixing temperature and compaction temperature are calculated by interpolation algorithm. In comparison with existing design methods, the determination method has characteristics of clear physical significance, accurate experimental results and the like, and also has good engineering practice effects.

Description

technical field [0001] The invention relates to the field of road engineering, and specifically provides a method for measuring the construction temperature of SBS modified asphalt. Background technique [0002] Asphalt is a temperature-sensitive material, and temperature is the first factor that determines the performance and process characteristics of asphalt and asphalt mixture. Therefore, when studying the performance of asphalt and asphalt mixture, we must clarify its temperature conditions; similarly, in During design and engineering construction, temperature must be required. Long-term practical experience has formed a special, comprehensive and strict temperature management system for asphalt pavement engineering. For example, in the test procedures for asphalt and asphalt mixture, all indicators have clear temperature requirements; In the pavement construction specification, there are also clear temperature requirements for various processes including mixing, trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/14G01K11/00
CPCG01K11/00G01N11/14
Inventor 樊亮李永振申全军王光勇林江涛魏慧王子立梁皓姜峰
Owner SHANDONG TRANSPORTATION INST
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