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A method for obtaining the thickness of asphalt film

A kind of asphalt film thickness and asphalt technology, which is applied in the field of obtaining asphalt film thickness, can solve the problems of small asphalt film thickness, gap, deviation, etc., and achieve the effect of accurate asphalt film thickness, improved accuracy and high precision

Active Publication Date: 2020-06-19
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to continuous changes in processing technology and other aspects, the fineness of mineral powder is increasing, and there is a deviation from the minimum particle size assumption of the standard derivation method, which leads to a large gap between the deduced specific surface area and the actual measured specific surface area of ​​the aggregate.
This also makes the obtained asphalt film thickness inaccurate
Furthermore, the traditional asphalt film calculation only considers the effective asphalt, and does not consider the influence of structural asphalt on the asphalt film thickness, which leads to a smaller asphalt film thickness calculated on this basis, which is different from that obtained by scanning electron microscopy (SEM). There is a gap in the actual observed thickness of the prepared test piece

Method used

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  • A method for obtaining the thickness of asphalt film
  • A method for obtaining the thickness of asphalt film
  • A method for obtaining the thickness of asphalt film

Examples

Experimental program
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preparation example Construction

[0103] After the preparation of the sample layer is completed, the present invention preferably carries out the determination of the K value of the instrument. The present invention has no special requirements for the determination of the K value, and the method for determining the K value well known to those skilled in the art can be used. In an embodiment of the present invention, the mensuration of described K value preferably carries out the mensuration of K value according to the instrument description of Blaine specific surface area tester (Blaine specific surface area tester), specifically: the density of standard powder, the density of standard powder Input the specific surface area and the porosity of the standard powder into the Blaine specific surface area tester, and turn on the instrument to record the K value.

[0104] After the determination of the K value is completed, the present invention preferably measures the falling time of the liquid level in the manomet...

Embodiment 1

[0142] The aggregates are prepared according to the asphalt aggregate gradation shown in Table 5, where GF is the median value of the standard gradation, and GJ is the embedded skeleton gradation.

[0143] Table 5 Asphalt aggregate gradation

[0144]

[0145]

[0146] In strict accordance with the requirements in the "Test Regulations for Highway Engineering Aggregate" (JTGE42-2005) T0302-2005, sampling was carried out to obtain the asphalt mixed aggregate to be tested, and the fine aggregate was selected as JL-1, and the asphalt mixed aggregate to be tested was weighed , to obtain the total mass of the asphalt mixture aggregate, and screen the asphalt mixture aggregate with screens of different apertures. Grade coarse aggregate with particle size not less than 2.36mm, superfine aggregate with particle size less than 0.15mm and medium grade aggregate with particle size greater than 0.15mm and less than 2.36mm are obtained.

[0147] 1. Using X-ray-CT technology as the me...

Embodiment 2

[0203] Measure the thickness of the asphalt film according to the scheme described in Example 1. The difference from Example 1 is that the measured object is the GJ embedded extrusion skeleton gradation prepared according to the asphalt mixture aggregate gradation shown in Table 5. . The measurement results of the specific surface area of ​​the GJ graded coarse aggregate are shown in Table 11, and the measurement results of the specific surface area of ​​the GJ graded ultrafine aggregate and medium-grade aggregate are shown in Table 12. The specific surface area of ​​each grade of aggregate is added to obtain GJ The gradation specific surface area is 11.68m2 / kg. Also using the formula shown in Formula I, the thickness of the asphalt film is 3.12, as shown in Table 13.

[0204] Table 11 Calculation of specific surface area of ​​GJ graded coarse aggregate

[0205]

[0206] Table 12 Calculation of specific surface area of ​​GJ graded fine aggregate

[0207]

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Abstract

The invention provides an asphalt film thickness obtaining method comprising the following steps: firstly measuring the asphalt content and relative density of an asphalt mixed aggregate, screening the asphalt mixed aggregate, and obtaining a plurality of levels of aggregates and the metered residue on sieve proportion of the corresponding level of aggregate according to the particle sizes of the aggregates; multiplying the specific surface area coefficient of each obtained level of aggregate with the metered residue on sieve proportion of the corresponding level of aggregate, and adding obtained products to gain a sum, thus obtaining the asphalt mixed aggregate specific surface area; respectively substituting the asphalt mixed aggregate specific surface area, the asphalt mixed aggregate asphalt content and the asphalt relative density under 25 DEG C into a formula, thus obtaining the asphalt film thickness. The test results show that the error between the optimum asphalt aggregate ratio calculated by using the asphalt film thickness obtained by the asphalt mixed aggregate film thickness determining method and the real optimum asphalt aggregate ratio of the corresponding asphalt mixed aggregate is between 0.0 and 1.0%.

Description

technical field [0001] The invention belongs to the technical field of asphalt application, in particular to a method for obtaining the thickness of asphalt film. Background technique [0002] After the interaction between the asphalt and the aggregate, the asphalt structure produced by the asphalt on the surface of the aggregate is the decisive factor for the formation of the asphalt mixture structure. The asphalt wrapped on the aggregate surface must reach a certain thickness to ensure that the asphalt mixture has sufficient Durability, and the grading of the mix and the optimal amount of bitumen are affected by the thickness of the bitumen film and affect the adhesion of the aggregate of the mix to the bitumen. Therefore, the determination of asphalt film thickness has guiding significance for the improvement of asphalt aggregate performance. [0003] At present, the method of obtaining the thickness of the asphalt film mainly divides the effective asphalt content by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/08G01N33/42
CPCG01B21/08G01N33/42
Inventor 蒋应军赵淑敏杨超群陈瑞亭王敏
Owner CHANGAN UNIV