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Humidity preservation method of fine aggregate asphalt mixture specimen

A technology of asphalt mixture and fine aggregate, which is applied to the analysis of materials, material weighing, instruments, etc. It can solve the problems of lack of methods for asphalt mixture humidity preservation, etc., and achieve small space occupation, easy access to instruments, and accurate humidity values Effect

Active Publication Date: 2019-10-25
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that there is a lack of a method for asphalt mixture humidity preservation to meet the requirements of the test conditions.

Method used

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  • Humidity preservation method of fine aggregate asphalt mixture specimen
  • Humidity preservation method of fine aggregate asphalt mixture specimen

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Embodiment Construction

[0021] The following examples further illustrate the technical solutions of the present invention, but are not intended to limit the protection scope of the present invention.

[0022] The method for humidity preservation of fine aggregate asphalt mixture test piece of the present invention, process is as follows:

[0023] 1) Preparation of fine aggregate asphalt mixture specimens

[0024] Use a gyratory compactor to form a fine aggregate asphalt mixture (FAM for short) specimen, control the void ratio, and then perform core drilling and cutting to obtain a standard specimen with a diameter of 150mm and a height of 70mm, with a void ratio of 4.3%± 0.3% of the standard test piece is cut, and the upper and lower ends of the formed test piece are cut off by 15mm with a fully automatic cutting saw to obtain a test piece with a middle height of 40mm and a diameter of 150mm, and a core drill (12mm drill bit) is used to cut along the The outer ring, the middle ring and the inner rin...

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Abstract

The invention discloses a fine aggregate asphalt mixture sample humidity curing method. The method comprises the following steps: forming and preparing a standard fine aggregate asphalt mixture sample according to designed grading and asphalt dosage; placing the sample in a vacuum dryer, regulating vapor pressure in the vacuum dryer by use of a saturated saline solution, so as to achieve 0-100% middle relative humidity; installing a temperature-humidity recorder in the vacuum dryer to record temperature-humidity change in the vacuum dryer in real time; placing the vacuum dryer in a biochemical incubator at 20 DEG to perform the humidity curing, wherein the sample curing humidity requirement is achieved when the sample quality maintains stable, and relative humidity is relative humidity in the vacuum dryer. The invention provides the method of performing the fine aggregate mixture sample curing under a vacuum state by using a chemical reagent as a humidity curing agent; the method has obvious innovation in the reasonability of the curing and the convenience in operation, and the curing effect is excellent.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for maintaining the humidity of fine aggregate asphalt mixture specimens. Background technique [0002] With the rapid development of expressway construction in our country, the problem of pavement disease is also particularly prominent. Water damage to asphalt pavement has become one of the most common early diseases of asphalt pavement in all countries in the world. At present, domestic and foreign scholars' researches on water damage mainly focus on the damage caused by water entering the interior of asphalt mixture in liquid form. For example, the immersion Marshall test and freeze-thaw splitting test in the Marshall asphalt mixture design method adopted in China are to subject the specimen to liquid water treatment such as static water immersion and freeze-thaw cycle. The freeze-thaw splitting tensile strength ratio before and after was used to evaluate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00C04B26/26
CPCC04B26/26G01N5/00C04B14/02
Inventor 罗蓉吕慧杰刘涵奇冯光乐
Owner WUHAN UNIV OF TECH
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