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Method for determining optimal dosage of emulsified asphalt in emulsified asphalt mixture

A technology of emulsified asphalt and mixture, which is applied in the direction of measuring devices, analysis materials, material inspection products, etc., can solve the problem of not considering the influence of asphalt coating uniformity of mixture, low strength of emulsified asphalt mixture and asphalt coating rate, etc. Unable to ensure the full spread and dispersion of emulsified asphalt, to achieve the effect of eliminating the difference in dryness and wetness, reducing test errors and high repeatability

Active Publication Date: 2019-04-16
TONGJI UNIV
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Problems solved by technology

The geotechnical compaction test recommended by JTG F41-2008 only determines the optimal water content according to the compactness of the mixture, and does not consider the influence of the change of the water content of the mixture on the strength and the uniformity of asphalt coating
The test shows that under the optimum water content determined by the geotechnical compaction test, the strength and asphalt adhesion rate of the emulsified asphalt mixture are low, which cannot ensure the full spread and dispersion of the emulsified asphalt on the aggregate surface
Therefore, there are certain errors in this method of determining the optimum water content.

Method used

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  • Method for determining optimal dosage of emulsified asphalt in emulsified asphalt mixture

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Embodiment 1

[0060] Such as figure 1 As shown, the method for determining the optimal amount of emulsified asphalt in the emulsified asphalt mixture of the present embodiment includes the following steps:

[0061] (1) Proportion design of mineral mixture:

[0062] Sieve limestone aggregates and limestone slag with a particle size of 0-3mm, 3-5mm, 4.75-9.5mm, 9.5-13.2mm, and 15-25mm. F41-2008) recommended medium-grain gradation type for mix ratio design, and the design synthesis gradation results are shown in Table 1.

[0063] Table 1 Synthetic gradation of emulsified asphalt mixture

[0064] Sieve hole(mm)

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Abstract

The invention provides a method for determining optimal dosage of emulsified asphalt in an emulsified asphalt mixture. The method comprises the following steps: performing grading on multiple grades of aggregates and mineral powder; determining the optimal water content OWC of the emulsified asphalt mixture; determining an equivalent lubrication coefficient gamma of the asphalt particles in relative to the water; determining the optimal dosage OEC of the emulsifier asphalt in the emulsified asphalt mixture, wherein the optimal water content OWC is determined according to the condition that thebulk volume relative density, splitting strength at 15 DEG C and asphalt attaching rate of a Marshall test piece are relatively high, the equivalent lubrication coefficient gamma is determined according to a principle that the void content change of the Marshall test piece is small, and the emulsified asphalt optimal dosage OEC is determined by taking small void content of the mixture and large splitting strength at 15 DEG C as the principle. Compared with the existing method, the method disclosed by the invention eliminates the different of the dry-wet degrees in the mixture under differentemulsified asphalt dosage, thereby reducing the test error, and the determination method for the optimal dosage OEC of the current emulsified asphalt is optimized.

Description

technical field [0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a method for determining the optimal amount of emulsified asphalt in emulsified asphalt mixture. Background technique [0002] The asphalt mixture with emulsified asphalt as the binder has the advantages of mixing at room temperature, easy construction, energy saving and emission reduction, and prolonging the construction season, and has significant social, economic and environmental benefits. [0003] At present, the methods for determining the optimal amount of emulsified asphalt in emulsified asphalt mixtures in my country are mainly divided into the total water content method and the total fluid content method. The total water content method means that only the lubricating effect of water in the emulsified asphalt is considered, and the lubricating effect of asphalt particles is not considered. In the process of changing the amount of emulsified...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N19/00G01N15/08
CPCG01N15/088G01N19/00G01N33/42
Inventor 胡明君李立寒王琎晨冯警蓉
Owner TONGJI UNIV
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