Asphalt mixture mixing temperature determination method based on surface energy theory

A technology for asphalt mixture and determination method, which is applied in the direction of physical/chemical changes in thermometers, chemical instruments and methods, mixers, etc., can solve problems that cannot reflect the adhesion of asphalt and aggregates, and achieve scientific results

Active Publication Date: 2020-10-30
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] For this reason, the present invention provides a method for determining the mixing temperature of asphalt mixture based on surface energy theory, so as to solve the problem that the mixing temperature of asphalt mixture obtained based on engineering experience or the viscosity-temperature curve of the matrix asphalt used in the prior art cannot reflect the accuracy of the asphalt mixture. and aggregate adhesion problems

Method used

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  • Asphalt mixture mixing temperature determination method based on surface energy theory
  • Asphalt mixture mixing temperature determination method based on surface energy theory
  • Asphalt mixture mixing temperature determination method based on surface energy theory

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Embodiment 1

[0042] Such as figure 1 As shown, a method for determining the mixing temperature of asphalt mixture based on the surface energy theory in this embodiment includes the following steps: step S100, obtaining the test results of the surface energy parameters of hot-melt asphalt; step S200, according to the adhesion work calculation formula , and combined with the test results of the surface energy parameters of hot-melt asphalt, the adhesion work of the asphalt-aggregate interface at different mixing temperatures is obtained; step S300, determining the temperature range of the peak value of the adhesion work of the asphalt-aggregate interface; step S400, Calculate the median value of the temperature range determined in step S300, and then determine the optimum mixing temperature of the asphalt mixture.

[0043]The technical effect achieved by this embodiment is: through a method for determining the asphalt mixture mixing temperature based on the surface energy theory in this embo...

Embodiment 2

[0063] Such as figure 1 and Figure 5 As shown, a method for determining the mixing temperature of asphalt mixture based on the surface energy theory in this embodiment includes all the technical features in Embodiment 1. In addition, the hot-melt asphalt surface energy parameter test obtained in step S100 The method includes the following steps:

[0064] Step S110, obtaining the contact angle between the hot-melt asphalt to be tested and three known aggregates;

[0065] Step S120, solving the linear equations to obtain the surface energy parameters of the hot-melt asphalt:

[0066]

[0067] Among them, γ s , gamma l Indicates the surface energy of solid and liquid, respectively, in mJ m -2 ; sl Indicates the solid-liquid interface energy, in mJ m -2 ; s represents the known aggregate; a represents the hot-melt asphalt to be tested; θ represents the contact angle between the hot-melt asphalt to be tested and the known aggregate; 1, 2, and 3 represent three known ag...

Embodiment 3

[0071] Such as figure 1 and Figure 5 As shown, a method for determining the mixing temperature of asphalt mixture based on the surface energy theory in this embodiment includes all the technical features in Embodiment 2. In addition, in step S110, the hot-melt asphalt to be tested and the obtained The specific experimental steps for knowing the contact angle between aggregates include:

[0072] Step S111, obtaining small stone flakes with a smooth surface: select coarse aggregates with regular shapes and known surface energy parameters and send them to a stone cutting plant, and use water sawing to cut the stones on both sides to obtain small stones with a smooth surface. Control the thickness value of small stones;

[0073]Step S112, polishing the small stone flakes to obtain a flat and smooth surface: washing the cut small stones with clean water and drying them, and then polishing the small stones with water sandpaper to obtain a flat and smooth surface;

[0074] Step S...

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Abstract

The invention discloses an asphalt mixture mixing temperature determination method based on a surface energy theory. The asphalt mixture mixing temperature determination method comprises the followingsteps of: step S100, acquiring a hot-melt asphalt surface energy parameter test result; step S200, according to an adhesion work calculation formula and the hot-melt asphalt surface energy parametertest result, obtaining adhesion work of an asphalt and aggregate interface at different mixing temperatures; S300, determining the temperature range of the peak value of the adhesion work of the asphalt and aggregate interface; and step S400, calculating the median of the temperature range determined in the step S300, and further determining the optimal mixing temperature of the asphalt mixture. According to the asphalt mixture mixing temperature determination method based on the surface energy theory of the invention, the problem that the mixing temperature of an asphalt mixture obtained according to engineering experience or a viscosity-temperature curve of matrix asphalt used by the mixture cannot reflect the adhesion of asphalt and aggregate is avoided, so that the determination of themixing temperature of the asphalt mixture is more scientific.

Description

technical field [0001] The invention relates to the technical field of parameter determination of asphalt mixture, in particular to a method for determining the mixing temperature of asphalt mixture based on surface energy theory. Background technique [0002] As an important process parameter in the mixing process of Hot Mixture Asphalt (HMA), the mixing temperature will affect the adhesion effect of the asphalt-aggregate interface of the mixing system to a certain extent. The aging of the asphalt binder in the process, if it is too low, will affect the fluidity of the asphalt, which is not conducive to its uniform coating on the aggregate surface and subsequent paving and compaction. At present, the determination of the mixing temperature of ordinary HMA in my country is often based on the workability of the mixture during construction and the aging of the asphalt binder, based on engineering experience or the viscosity-temperature curve of the base asphalt used in the mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G06F30/20
CPCG01N13/00G06F30/20G06F2119/08C08L95/00G01K11/00G01K13/12B01F35/213C08L2555/10C08L2555/22G01N21/84G01N2021/8405
Inventor 刘黎萍卢青兵孙立军李明宸
Owner TONGJI UNIV
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