Method for distinguishing gaseous water dispersing mode in bituminous mortar

A diffusion mode, asphalt mortar technology, applied in the field of traffic pavement materials, can solve problems such as inability to distinguish gaseous water diffusion modes

Active Publication Date: 2018-05-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the prior art cannot distinguish the diffusion mode of gaseous water in asphalt mixture, the invention provides a method for dividing the diffusion mode of gaseous water in asphalt mortar

Method used

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  • Method for distinguishing gaseous water dispersing mode in bituminous mortar
  • Method for distinguishing gaseous water dispersing mode in bituminous mortar
  • Method for distinguishing gaseous water dispersing mode in bituminous mortar

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Experimental program
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specific Embodiment approach 1

[0019] Specific implementation mode 1: The method for dividing the diffusion mode of gaseous water in asphalt mortar provided in this implementation mode is specifically carried out according to the following steps:

[0020] Step 1. Based on the one-dimensional diffusion theory, prepare a thin-plate asphalt mortar specimen with an aspect ratio greater than 10:1, such as figure 1 , figure 2 As shown, ensure that the diffusion process occurs along the axial direction of the specimen;

[0021] Step 2: Carry out a gaseous water adsorption test under constant temperature T (using thermodynamic temperature, unit is K) and different relative humidity φ conditions, and measure the dry test piece quality W 0 And the mass W of the test piece when the adsorption equilibrium is reached under each humidity condition (the weight gain of the test piece at intervals of more than 24 hours does not exceed the measurement accuracy of the electronic balance) ∞ , according to Calculate the eq...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 3, a constant temperature and humidity incubator is used to provide constant temperature and humidity conditions, the relative humidity inside the container is maintained by saturated saline solution or distilled water, and the relative humidity outside the container is determined by Maintain a constant temperature and humidity incubator.

[0025] Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0026] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one is that in step four, the specific steps for calculating the proportion of the diffusion flux in different diffusion modes to the total diffusion flux are as follows:

[0027] Step 41, the effective diffusion coefficient D is calculated using the data in the stable stage of the diffusion test in step 3, as shown in formula (1):

[0028]

[0029] Among them, H is the height of the specimen, the unit is m, is the relative humidity outside the container, Indicates the relative humidity inside the container, △t is the time interval between two mass measurements in the step 3 diffusion test, the unit is s, △m is the mass loss of the test piece device within the given time interval △t, the unit is kg, A refers to is the diffusion area of ​​the specimen, that is, the area of ​​the container opening, in m 2 ,p s is the saturated vapor pressure of wate...

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Abstract

The invention provides a method for distinguishing gaseous water dispersing mode in bituminous mortar, and belongs to the field of traffic pavement materials. The method comprises the following steps:manufacturing a thin-sheet type bituminous mortar test part of which the diameter-height ratio is beyond 10: 1; performing gaseous water absorbing test under constant temperature T and different relative humidity phi conditions; calculating equilibrium absorption capacity of the test part in each humidity; then performing gaseous water dispersing test under a constant-temperature and constant-humidity condition, wherein the constant temperature is identified as T; testing the overall mass of the test part device in different time until the stable stage that mass varies at constant speed as time goes one is achieved; then calculating the data obtained from the absorbing test and the dispersing test; and calculating the proportion of the diffusion flux of different dispersing modes in the total diffusion flux. With the adoption of the method, the problem that the gaseous water dispersing mode in the bituminous mortar cannot be distinguished by the prior art can be solved; and the methodis applicable to bituminous mortar damage mechanism study.

Description

technical field [0001] The invention belongs to the field of traffic pavement materials, in particular to a method for dividing the diffusion mode of gaseous water in asphalt mortar. Background technique [0002] Moisture is one of the important factors affecting the durability of asphalt pavement. The transmission of moisture in the asphalt pavement will destroy the adhesion between asphalt and aggregates and the cohesion of the binder itself, resulting in various diseases such as pavement cracking, rutting and shortened fatigue life. Under the effect of freezing and thawing, the volume change caused by the freezing and melting of water is likely to cause frost heaving and muddying of the pavement, which seriously affects the performance of the pavement. [0003] In the complex natural environment where the asphalt pavement is in service, moisture exists in three phases: liquid, solid and gas. Different from the short-term action forms of liquid water and solid water, gase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
CPCG01N5/02
Inventor 徐慧宁周晶董岐峰谭忆秋
Owner HARBIN INST OF TECH
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