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Simple device for radially testing low-temperature performance of asphalt mixture

A technology of asphalt mixture and low-temperature performance, which is applied in the direction of measuring devices, applying stable tension/pressure to test material strength, and analyzing materials, which can solve the problems of low test efficiency, cumbersome preparation of test pieces, and low accuracy of test results. Achieve the effects of simplifying the testing process, improving measurement accuracy, and eliminating the process of sticking parts

Active Publication Date: 2019-03-01
HARBIN INST OF TECH
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Problems solved by technology

[0011] The invention provides a simple device for radially testing the low-temperature performance of asphalt mixture, in order to solve the problems of cumbersome preparation of test pieces, low test efficiency and low accuracy of test results in the traditional low-temperature performance test method of asphalt mixture

Method used

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  • Simple device for radially testing low-temperature performance of asphalt mixture
  • Simple device for radially testing low-temperature performance of asphalt mixture
  • Simple device for radially testing low-temperature performance of asphalt mixture

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Embodiment

[0031] (1) Low temperature shrinkage test

[0032] The test equipment needs to prepare a circular cylinder specimen, and convert the radial deformation of the specimen into axial deformation through a simple device. The test equipment adopts a rebound type LVDT. The average shrinkage strain and average shrinkage coefficient in the cooling interval are calculated according to formula (1-1) and formula (1-2).

[0033] Δr=Δh·tanθ (1-1)

[0034]

[0035] In the above formula: α——average shrinkage shrinkage coefficient (°C -1 );

[0036] Δr——Annular radius deformation (mm);

[0037] θ——the angle between the conical surface of the conical block and the normal;

[0038] ——The outer diameter of the test piece (mm);

[0039] ——Inner diameter of test piece (mm);

[0040] C——average linear shrinkage coefficient of asphalt mixture;

[0041] see image 3 Explanation, example: Prepare standard Marshall specimen 6, obtain a circular cylinder specimen through coring, and carry ...

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Abstract

The invention provides a simple device for radially testing low-temperature performance of an asphalt mixture and relates to an asphalt performance testing device in order to solve the problems of tedious preparation test pieces, low test efficiency and low test result accuracy in a traditional method for testing the low-temperature performance of the asphalt mixture. The simple device comprises aconical block and a sleeve, wherein the sleeve is formed by N symmetric arc-shaped plates through butt joint, an inner hole of the sleeve is a regular N-polygon pyramid frustum hole which is tangentto the conical block, a chute is formed in the mid-line of the side surface of the regular N-polygon pyramid frustum hole, a steel ball contacted with the conic surface of the conical block is arranged in the chute, and a piece supporting tray is fixedly connected with the end surface where the small hole end of the regular N-polygon pyramid frustum hole is located. The simple device is used for testing the low-temperature performance of the asphalt mixture.

Description

technical field [0001] The invention relates to an asphalt performance testing device, in particular to a simple device for radially testing the low-temperature performance of asphalt mixture. Background technique [0002] The problem of low temperature shrinkage cracking of asphalt pavement is a problem that plagues experts at home and abroad. More than half of our country's asphalt pavement will be harmed by temperature cracks. The low-temperature performance of asphalt mixture directly reflects its ability to resist temperature shrinkage and cracking, so it is particularly important to obtain the test method for the low-temperature performance of asphalt mixture; and the accuracy of temperature stress checking when designing asphalt pavement depends largely on material parameters Accuracy of the test on fetch. The current testing method has the following problems: [0003] (1) The testing process is cumbersome and the testing accuracy is low; [0004] In the low-tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18G01N3/02
CPCG01N3/02G01N3/18G01N2203/0019G01N2203/0067G01N2203/0228G01N2203/0262
Inventor 谭忆秋孙志棋郑斌王大为孟安鑫王筵铸李广
Owner HARBIN INST OF TECH
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