Method for measuring void ratio of macadam mixture

A technology of mixture and porosity, which is used in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc. The effect of short time, less error in measurement, and fewer test steps

Inactive Publication Date: 2015-05-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] The present invention is to solve the problem that the traditional void ratio measurement method needs to measure the mass of aggregates and calculate the density in different states for many times; there are many test steps, the operation is complicated, and errors are prone to occur; the test calculation involves the temperature of the water density at the test temperature correction, its correction coefficient α T not easy to obtain, but provides a method of measuring the porosity of crushed stone mixture

Method used

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  • Method for measuring void ratio of macadam mixture
  • Method for measuring void ratio of macadam mixture
  • Method for measuring void ratio of macadam mixture

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0056] Specific implementation mode one: combine figure 1 and figure 2 Describe this implementation mode, this implementation mode is realized through the following steps:

[0057] Step 1: Put the crushed stone mixture 10 in a metal hanging basket, put the metal hanging basket into a container and soak in water for 24 hours, so that the open spaces of the crushed stone mixture are saturated with water;

[0058]Step 2: After checking that the measuring barrel 3 in the measuring device is leak-free, seal the water outlet 3-1 with the sealing valve 5, and remove the four foot screws 9;

[0059] Step 3, dry the water on the surface of the gravel mixture 10 with a wet towel, then put the saturated gravel mixture 10 into the measuring bucket 3, add 5ml to 10ml of water into the testing bucket 3, and the water The volume of V is denoted as V f1 , using a compaction instrument to vibrate the crushed stone mixture 10, and the compaction instrument is a prior art;

[0060] Step 4. ...

specific Embodiment approach 2

[0080] Specific implementation mode two: combination figure 1 To illustrate this embodiment, add 6ml of water into the test bucket 3 in step 3 of this embodiment. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0081] Specific implementation mode three: combination figure 1 To illustrate this embodiment, add 7ml of water into the test bucket 3 in step 3 of this embodiment. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses a device and a method for measuring the void ratio of a macadam mixture and relates to a method for measuring the void ratio of a mixture. According to the method, the problem that a temperature correction factor alphaT of water density is difficult to be obtained because the measurement of aggregate quality and the calculation of density need to be carried out for several times at different states in a traditional void ratio measurement method is solved. The method comprises the following steps: (1) soaking the macadam mixture in water for 24 hours; (2) detaching four foot screws; (3) carrying out vibration compaction on the macadam mixture by virtue of a compaction instrument; (4) measuring the height from the upper surface of the macadam mixture to the top surface of a measurement bucket for several times, and recording an average height value as h1; (5) detaching a seal valve, mounting a water guide pipe, and regulating the foot screws to keep a base plate horizontal; (6) injecting water into the measurement bucket until water flows out of a water outlet, and recording volume Vf2 of added water and volume Vf0 of water flowing out of the water outlet in the water injection process; and (7) calculating the void ratio KV of the macadam mixture by virtue of measurement results of the steps, wherein KV is equal to formula (shown in the specification). The method is used for calculating the void ratio of the macadam mixture.

Description

technical field [0001] The invention relates to a method for measuring the void ratio of a mixture, in particular to a method for measuring the void ratio of a gravel mixture. Background technique [0002] The void ratio of coarse aggregate in the compacted state is an important parameter in the mix design of asphalt mixture and inorganic binder. It reflects the skeleton structure characteristics of the mixture and can be used to estimate the amount of matrix material. The skeletal gap ratio in the compacted state of the material is calculated according to the formula (4): [0003] VCA DRC = ( 1 - ρ 1 ρ 2 ) × 100 % - - - ( 4 ) [0004] In the form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 马松林单丽岩廖秋杰李酉勇
Owner HARBIN INST OF TECH
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