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Asphalt-aggregate interface adhesion property testing method

A measurement method and aggregate technology, which is applied in the field of performance evaluation of road construction materials, can solve the problems such as the failure to propose the adhesion performance of the ratio, the failure to propose the adhesion performance between the asphalt-aggregate interface, and the lack of accuracy.

Inactive Publication Date: 2016-07-27
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the papers published above, only the method for measuring the surface energy was provided, without a detailed description of the measurement steps, and no corresponding index was proposed to evaluate the adhesion performance between the asphalt-aggregate interface
In the papers published above, only relying on the acid-base composition of aggregates to judge its adhesion performance to the asphalt-aggregate interface, did not propose the ratio of the asphalt adhesion work to the peeling work to judge the asphalt-aggregate interface Adhesion between
At the same time, in the papers published above, when calculating the adhesion work, only the surface energy of the asphalt was considered, and the surface energy of the aggregate was not considered, and the asphalt-aggregate adhesion work and peeling work were directly calculated. accuracy

Method used

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Examples

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Embodiment 1

[0056] A method for measuring asphalt-aggregate interfacial adhesion properties, comprising the following steps in sequence:

[0057] Step A: find out the surface free energy of distilled water, glycerol, and formamide;

[0058] Step B: Heat the asphalt to a fluid state, pour it on a glass sheet, and cool it to form a smooth surface. Grinding the aggregate (limestone) into a smooth plane with two parallel sides, washing and drying, so that, on the smooth plane, the three liquids in step A are evenly distributed, which is conducive to obtaining accurate results, while the two sides of the limestone are parallel, It is for the smooth plane that is distributed with three kinds of liquids in step A not to incline, also is to guarantee that described three kinds of liquids are evenly distributed on the smooth plane, further guarantees the accuracy of measurement result;

[0059] Step C. Utilize the contact angle measuring instrument to measure the contact angles of three kinds of ...

Embodiment 2

[0130] An asphalt-aggregate interfacial adhesion performance measurement method, the difference from Example 1 is that in the implementation of step B, in addition to heating the asphalt to a fluid state and pouring it on the glass to form a smooth plane, the warm mix agent (Sasobit) heated to a fluid state and poured on a glass sheet, cooled to form a smooth plane.

[0131] When step C was implemented, the contact angles of the three test liquids on the surface of the Sasobit warming agent were also measured, as shown in Table 7.

[0132] Table 7 Sasobit warm mix agent and test liquid contact angle measurement results

[0133]

[0134] When implementing step D, bring the contact angle measurement results on the surface of the Sasobit warm mix agent in Table 4 into the formula

[0135] (1-10), the calculated surface free energy of Sasobit warm mix agent is shown in Table 8.

[0136] Table 8 Sasobit warm mix agent surface energy calculation results (mJ / m 2 )

[0137] ...

Embodiment 3

[0147] A kind of asphalt-aggregate interfacial adhesion performance determination method, differs from embodiment 2, when implementing step B, warm mix agent is changed from Sasobit to RH, and in step C, measure and obtain three kinds of test liquids in warm mix agent The contact angle of the RH surface and the surface free energy of the RH warm mix agent calculated in step D are shown in Table 9.

[0148] Table 9 Calculation results of surface free energy of RH warm mix agent (mJ / m 2 )

[0149]

[0150] Therefore, W is calculated in step E ase =71.25mJ / m 2 , Wasew=45.76mJ / m 2 . Energy parameter EP in step F 1 =1.56>1, indicating that the SK-90 matrix asphalt-limestone-RH warm mix agent in this example has better adhesion performance.

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Abstract

The invention discloses an asphalt-aggregate interface adhesion property testing method. The method comprises the following steps: A, selecting three testing liquids which are not dissolved in asphalt and have known surface energy; B, heating the asphalt or a warm mixing agent till a flowing state is achieved, respectively casting on a plate, cooling to form a smooth plane, and grinding aggregate into a smooth plane of which two sides are parallel to each other; C, respectively dripping the three liquids on the smooth plane formed by the asphalt, the warm mixing agent or the aggregate in the step B, and respectively measuring contact angles of three testing liquids on the surface of the asphalt, the aggregate or the warm mixing agent; D, calculating the surface energy of the asphalt, the aggregate or the warm mixing agent; E, respectively constructing adhesion models in different systems, and calculating adhesion work of the adhesion models; and F, establishing energy parameters, and evaluating the influence of an additive to the adhesion property of asphalt-aggregate in an implementation sequence of steps A, B, C-F or B, A, C-F. By adopting the asphalt-aggregate interface adhesion property testing method, the influence of the additive to the adhesion property of the system can be evaluated.

Description

technical field [0001] The invention belongs to the technical field of performance evaluation of road construction materials, and relates to a method for measuring the adhesion performance of warm-mixed asphalt-aggregate interface. Background technique [0002] Warm mix asphalt mixture has the characteristics of energy saving and environmental protection, but due to the low drying temperature of the aggregate, the moisture in the aggregate may not be completely removed, and the moisture retained in the aggregate is easy to accumulate at the interface between the aggregate and the asphalt, thus affecting The bonding performance between asphalt and aggregates leads to the occurrence of diseases such as loosening and spalling of asphalt pavement, that is, water damage to asphalt pavement. In order to popularize and apply warm mix asphalt mixture in a large area, many experts and scholars began to study the water damage of asphalt pavement. [0003] The main basis for the mecha...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00Y02A30/30
Inventor 季节索智许鹰翟鹏文博
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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