Four-ball friction test evaluation method for adhesion performance of asphalt and coarse aggregate

An evaluation method and friction testing machine technology, applied in the direction of analyzing materials, instruments, measuring devices, etc., can solve the problems of ineffective evaluation of asphalt adhesion, shedding, and large influence, so as to avoid the influence of human subjective factors and make the preparation simple Convenience, the effect of avoiding interference effects

Pending Publication Date: 2020-12-18
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging the adhesion level by boiling method is mainly based on human subjective evaluation, human factors have a greater influence, and the test results have certain limitations
At the same time, with the increasing application of modified asphalt, some modified asphalt cannot fall off from the aggregate surface after being boiled, which makes the water boiling method unable to effectively evaluate the adhesion of asphalt
Moreover, the asphalt has not peeled off, which also makes it impossible to effectively evaluate the adhesion of asphalt by photoelectric colorimetry and agitated water net adsorption method.

Method used

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  • Four-ball friction test evaluation method for adhesion performance of asphalt and coarse aggregate
  • Four-ball friction test evaluation method for adhesion performance of asphalt and coarse aggregate
  • Four-ball friction test evaluation method for adhesion performance of asphalt and coarse aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preprocessing of coarse aggregate

[0041] (1-1) Limestone is used as the aggregate. First, coarse aggregates with large particle sizes greater than 12mm are initially selected to measure the total area of ​​the coarse aggregates;

[0042] (1-2) Process the selected large-size coarse aggregate with a rounder, process 5 balls with a diameter of 12 mm, and ensure that the surface roughness Ra of the coarse aggregate ball is less than 25.0 μm;

[0043] (2) Asphalt coating and cooling treatment

[0044] (2-1) Place the coarse aggregate balls in step (1) in an oven at 105°C and heat for 1 hour;

[0045] (2-2) Put the heated coarse aggregate balls into the pre-heated asphalt with a small colander. The asphalt is SBS modified asphalt, and the temperature of the asphalt heating is controlled at 160°C; The ball is completely covered with asphalt film;

[0046] (2-3) Gently take out the sample, and place it in a closed glass container with a nitrogen content of 90% by volume...

Embodiment 2

[0060] The method of embodiment 2 and embodiment 1 is identical, and difference is that in described step (1-1), coarse aggregate adopts the aggregate of 3 kinds of different lithologies, respectively granite, basalt, quartzite; Step (2-2 ) asphalt adopts SBR modified asphalt. The adhesion of three lithological aggregates to SBR modified asphalt was compared. The results are shown in Table 4.

[0061] Table 4 Example result two

[0062]

[0063] It can be seen from the experimental results that the adhesion grades of the three lithological aggregates obtained by the present invention are granite>basalt>quartzite; and the adhesion of the three lithological aggregates is the same when using the current standard boiling method. Therefore, the present invention can effectively distinguish and judge the order of good and bad adhesion of aggregates.

Embodiment 3

[0065] The method of embodiment 3 and embodiment 1 is identical, aggregate adopts limestone; Difference is that in described step (2-2), asphalt adopts SBS modified asphalt, SBR modified asphalt and rubber modified asphalt, the temperature of asphalt heating The temperature is controlled at 160°C; the adhesion of three kinds of asphalt to limestone aggregates is compared. The results are shown in Table 5.

[0066] Table 5 Example result three

[0067]

[0068]

[0069] As can be seen from the experimental results, adopt the present invention to obtain three kinds of asphalt experimental results and the adhesion rank order is rubber modified asphalt>SBS modified asphalt>SBR modified asphalt; Adhesion is the same as that of permanent asphalt. Therefore, the present invention can effectively distinguish and judge the order of good and bad asphalt adhesion.

[0070] In addition, although there is currently a method for testing the load-carrying capacity of a lubricant wit...

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Abstract

Aiming at the problems existing in the adhesion of asphalt at present, the inventor establishes a four-ball friction test evaluation method for the adhesion performance of asphalt and coarse aggregate, and a four-ball friction testing machine is adopted to carry out a friction test on boiled coarse aggregate balls coated with asphalt; and then the area of the rotating material ball sample before friction and the size of a friction spot after friction are measured through an MATLAB image processing technology, and quantified to obtain the adhesion grade between the asphalt and the coarse aggregate. According to the method, a new evaluation benchmark is established, the embedding extrusion effect between the coarse aggregates is effectively avoided, the adhesion can be directly and quantitatively evaluated, the method has better scientificity and accuracy, a new method and thought are provided for researching and evaluating the adhesion between the asphalt and the coarse aggregate, and the method has the characteristics of simplicity, rapidness and accuracy.

Description

technical field [0001] The invention belongs to the technical field of detecting the adhesion performance of asphalt and coarse aggregate, and in particular relates to a four-ball friction test evaluation method for the adhesion performance of asphalt and coarse aggregate. Background technique [0002] With the development of my country's transportation industry, my country's quality requirements for high-grade highways are also getting higher and higher. Asphalt pavement has the irreplaceable advantage of concrete pavement, occupying more than 90% of high-grade highways. However, during the use of asphalt pavement, overspeeding and overloading of road vehicles frequently occur, and the maintenance of existing roads is insufficient, resulting in a large number of roads of different grades being damaged to varying degrees. According to relevant studies, more than 70% of the early damage of asphalt pavement is directly or indirectly related to the water stability of the pavem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 黎水昌贤有汞周胜波韦万峰黄慧谭继宗
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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