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Asphalt mixture freeze thawing splitting experiment vacuum full water and soaking method

A technology of freeze-thaw splitting test and asphalt mixture, which is applied in the direction of material inspection products, etc., and can solve problems such as insufficient immersion, bubble adhesion, and affecting the results of freeze-thaw splitting tests

Inactive Publication Date: 2008-10-01
NANTONG ZHONGRUN CONCRETE +1
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Problems solved by technology

[0008] Technical problem: The purpose of this invention is to provide a new method of vacuum saturation and immersion in the freeze-thaw splitting test of asphalt mixture. , not easy to remove, affecting the results of the freeze-thaw splitting test, and the problem of insufficient soaking after being saturated with water

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  • Asphalt mixture freeze thawing splitting experiment vacuum full water and soaking method

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Embodiment Construction

[0026] Form Marshall specimens according to the relevant test methods of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJ052-2000), compact each side 50 times, the number of specimens is not less than 8, measure the void ratio of the specimens, and take the average The principle of equal porosity is divided into 2 groups. Place the first group of specimens on the platform and store them at room temperature for later use. Carry out the second group of test pieces according to the vacuum saturation and water immersion method of this patent, and the specific steps are as follows:

[0027] (1) Divide the vacuum desiccator into two parts with a partition, and seal them well. Place the dry specimen on one side, fill the other side with water, and connect the middle top with a water pipe, as shown in the figure.

[0028] (2) After putting the test piece in, start the vacuum pump and vacuumize the test piece in the air environment to 730mmHg-740mmHg, an...

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Abstract

A vacuum saturation an immersion method of an asphalt mixture freeze thawing cleavage test is a method which is used for effectively evaluating the water stability of the asphalt mixture, and especially to a method which is easier to settle the problem of insufficient vacuum saturation and immersion caused by that considerable air bubbles adhere on the surface of the test piece and can not be removed easily in vacuum saturation of the mixture freeze thawing cleavage test. The method comprises the following procedures: a procedure 1, dividing a vacuum drier into two independent parts which are connected through a running water pipe at the center with a spacing plate; a procedure 2, executing vacuum pumping to the test piece in the air environment and sustaining for 15 minutes; a procedure 3, overflowing water above the test piece under vacuum environment, returning to the atmospheric state and stewing for 15 minutes, a procedure 4, discharging the water in the vacuum drier, pumping into vacuum, sustaining for 5 minutes, overflowing the water above the test piece, returning to the atmospheric state and then stewing the test piece in the water for 5 minutes, circulating procedure 4 for 15 times; and a procedure 5, executing a freeze-thaw cycle.

Description

technical field [0001] The invention is a method for effectively evaluating the water stability of asphalt mixture, especially a method for solving the problem of vacuum saturation and insufficient immersion in the freeze-thaw splitting test of the mixture, which belongs to the technical field of highway asphalt pavement. Background technique [0002] In expressway construction, asphalt pavement is a seamless continuous pavement, with its flat and wear-resistant surface, stable and comfortable driving performance, good mechanical strength, no dust, small vibration, low noise and short construction period Features such as easy maintenance and easy maintenance occupy a large share in the construction of modern expressways and are very popular. Most of the current highways in the world use asphalt pavement, such as the asphalt pavement in the United States accounts for 93% of the national highway pavement; 94% of the highways in Japan are asphalt pavement. More than 90% of the...

Claims

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Application Information

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IPC IPC(8): G01N33/42
Inventor 黄晓明许涛
Owner NANTONG ZHONGRUN CONCRETE
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