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Method for detecting dynamic modulus of each layer of asphalt pavement and adhesion device

A technology for asphalt pavement and dynamic detection, which is applied in the direction of measuring devices, application of repeated force/pulsation force to test material strength, instruments, etc., can solve the problem that asphalt pavement cannot be stratified in the south, and achieve the effect of low equipment transformation cost

Pending Publication Date: 2017-03-08
JSTI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, due to the limitation of the simple performance tester (SPT) product, only the asphalt pavement with a thickness of more than 15cm can be tested. Lunan cannot be layered, and each layer is accurately detected

Method used

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  • Method for detecting dynamic modulus of each layer of asphalt pavement and adhesion device
  • Method for detecting dynamic modulus of each layer of asphalt pavement and adhesion device
  • Method for detecting dynamic modulus of each layer of asphalt pavement and adhesion device

Examples

Experimental program
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Embodiment 1

[0047] The dynamic detection method for each layer of asphalt pavement in this embodiment comprises the following steps:

[0048] (1) Specimen preparation: Drill the core on the road to take a 150mm diameter specimen, drill a core sample with a diameter of 100mm in the room, and then use a double-sided saw to cut off each layer of mixture and store it in an environment of 5-27°C , the time should not exceed two weeks;

[0049] (2) Paste the Velcro: First, manually attach 6 L-shaped custom-made Velcro (see attached image 3 ) around the core sample, and arrange 3 rows of 6 at equal intervals along the circumference (that is, every 2 rows are 120° apart). Fix the second sticky fasteners on the 6 first sticky buttons with special equipment for sticking sticky buckles, and then place the displacement sensor between each row of sticky buckles so that it is perpendicular to the end face of the test piece, and adjust the displacement sensor so that the measuring range Can measure t...

Embodiment 2

[0070] The fastening device of this embodiment is the fastening device used in the dynamic detection method for each layer of asphalt pavement asphalt pavement described in the above-mentioned embodiment 1, and the fastening device is composed of a first fastening fastening and a second fastening fastening, The first Velcro is composed of a horizontal block and a vertical block connected to each other, one end of the horizontal block is connected to the core sample, and the other end is connected to the vertical block, and the second Velcro is a Cubic block structure, the second sticky fastener is connected to the vertical block. The fastening device of this embodiment is an L-shaped structure, see Figures 3 to 5 shown.

[0071] In this embodiment, the cube fastener is pasted on the vertical block by glue. The horizontal block and the vertical block are integrally structured.

[0072] When in use, stick 6 first sticky buttons around the core sample by hand, place 3 rows of...

Embodiment 3

[0074] The fastening device of this embodiment differs from the above-mentioned embodiment 2 only in that the fastening device has a T-shaped structure, see Image 6 .

[0075] In each of the above embodiments, the fastening device is arranged on the cylindrical surface of the core sample, at a position between the distance to the upper surface of 1 / 6 of the height of the core sample and the distance to the lower surface of 1 / 6 of the height of the core sample.

[0076] In each of the above-mentioned embodiments, in order to better realize the connection between the horizontal block and the core sample, the end surface pasted between the horizontal block and the core sample has an arc surface structure, and the structure of the arc surface is consistent with the circle of the core sample. Compatible with curved surfaces.

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Abstract

The invention relates to a method for detecting dynamic modulus of each layer of an asphalt pavement and an adhesion device. The method comprises the following step of detecting the dynamic moduli of an upper surface layer, a middle surface layer and a lower surface layer of an original pavement. According to the method disclosed by the invention, an SPT (Simple Performance Tester) or a loading device which is capable of applying offset sine wave type or haversine wave form load, is in a frequency range of 0.1 to 25 Hz, can achieve 2800KPa of maximum stress application level and is capable of achieving 5N of loading resolution ratio is adopted. Offset sine wave or haversine wave type axial pressure stress is applied to each core sample layer, restorable axial strain of a testing piece can be measured, and uniaxial compression dynamic modulus within an online viscoelasticity range of each layer of the asphalt pavement in service can be calculated. Harsh requirements of an existing dynamic modulus detecting device on sizes of core samples are met; according to the method, the measurable thickness range of the core samples is 3 cm to 15 cm, and the method can be used for calculating material parameters of each layer of an existing asphalt pavement, evaluating the current situation of each layer of the asphalt pavement in service and forecasting the residual life of an old pavement.

Description

technical field [0001] The invention relates to the technical field of testing for evaluating asphalt pavement of old roads, in particular to a dynamic detection method for each layer of asphalt pavement and a gluing device. Background technique [0002] As of the end of 2015, my country's high-grade highway construction mileage has surpassed that of the United States, ranking first in the world. With the improvement of my country's road network, the accompanying problems are becoming more and more prominent. The number of years of expressway traffic continues to increase, the traffic volume continues to increase, repeated loads in successive years and changes in climate, environment and other factors make the actual work of asphalt pavement difficult. There are large differences in the stress state and material properties, which cannot be analyzed and evaluated with the current static mechanics system. Through the investigation of the existing dynamic performance testing me...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/32
CPCG01N3/02G01N3/32G01N2203/0007
Inventor 朱浩然蔡海泉温肖博李豪丁武洋潘彬于明明吴昊张鹏王树杰蒋龙松
Owner JSTI GRP CO LTD
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