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A kind of asphalt cohesion determination method

A measurement method and technology of cohesion, which is applied in the field of asphalt performance testing in highway engineering, can solve the problems of difficult and inaccurate determination of cohesion, achieve convenient evaluation, reduce measurement cost, and improve accuracy Effects of Sex and Accuracy

Active Publication Date: 2021-08-17
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most of the strength envelopes are not linear, and the determination of the cohesive force by finding the intercept of the extended straight line is not accurate, in many cases, under very low confining pressure or even no confining pressure (no normal stress) shear tests are also difficult to accurately determine cohesion

Method used

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  • A kind of asphalt cohesion determination method
  • A kind of asphalt cohesion determination method
  • A kind of asphalt cohesion determination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The method of the present embodiment comprises the following steps:

[0036] Step 1. Align the upper box 4 and the lower box 2 in the improved strain-controlled direct shear instrument and insert the fixed pin into the corresponding pin hole 7 to assemble the shear box, and then install the shear box on the inner wall and The bottom surface is coated with an asphalt release agent; the upper box 4 is provided with a round hole formed by a large-diameter round hole and a small-diameter round hole through which the longitudinal section is an inverted convex shape; the lower box 2 is provided with a round hole with a large diameter Holes and small-diameter round holes and blind holes with a convex longitudinal section; the inner diameters of the large round holes in the upper box 4 and the lower box 2 are both 40mm, and the height of the large round holes in the upper box 4 is 15mm. The height of the middle scale line is 10mm, the height of the large round hole in the lower...

Embodiment 2

[0042] The method of the present embodiment comprises the following steps:

[0043] Step 1. Align the upper box 4 and the lower box 2 in the improved strain-controlled direct shear instrument and insert the fixed pin into the corresponding pin hole 7 to assemble the shear box, and then install the shear box on the inner wall and The bottom surface is coated with an asphalt release agent; the upper box 4 is provided with a round hole formed by a large-diameter round hole and a small-diameter round hole through which the longitudinal section is an inverted convex shape; the lower box 2 is provided with a round hole with a large diameter Holes and small-diameter round holes and blind holes with a convex longitudinal section; the inner diameters of the large round holes in the upper box 4 and the lower box 2 are both 40mm, and the height of the large round holes in the upper box 4 is 15mm. The height from the middle bottom surface to the scale mark is 10mm, the height of the large...

Embodiment 3

[0049] The method of the present embodiment comprises the following steps:

[0050] Step 1. Align the upper box 4 and the lower box 2 in the improved strain-controlled direct shear instrument and insert the fixed pin into the corresponding pin hole 7 to assemble the shear box, and then install the shear box on the inner wall and The bottom surface is coated with an asphalt release agent; the upper box 4 is provided with a round hole formed by a large-diameter round hole and a small-diameter round hole through which the longitudinal section is an inverted convex shape; the lower box 2 is provided with a round hole with a large diameter Holes and small-diameter round holes and blind holes with a convex longitudinal section; the inner diameters of the large round holes in the upper box 4 and the lower box 2 are both 40mm, and the height of the large round holes in the upper box 4 is 15mm. The height from the middle bottom surface to the scale mark is 10mm, the height of the large...

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Abstract

The invention discloses a method for measuring cohesion of asphalt. The method comprises: 1. Fixing and assembling the upper box and the lower box in the improved strain control type direct shear instrument to form a shear box, and coating an asphalt release agent; 2. 1. Heat the asphalt and pour it into a shear box coated with asphalt release agent to cool it down and keep it warm; 3. Roll the shear box filled with asphalt after heat preservation horizontally and adjust the force indicator to zero; 4. Pull out Remove the fixed pin of the shear box, start the stopwatch and turn the handwheel at a constant speed and observe and record the maximum shear deformation reading of the asphalt; 5. Calculate the shear stress value when the asphalt is sheared, that is, the cohesion of the asphalt. The invention improves the shear cell of the strain control type direct shear instrument, obtains an asphalt sample with an I-shaped longitudinal section, reduces the internal stress and stress area of ​​the asphalt sample, and avoids the vertical normal stress on the asphalt failure surface Destruction reduces the horizontal force in the cohesion measurement process, reduces the measurement difficulty, and improves the accuracy and accuracy of the measurement results.

Description

technical field [0001] The invention belongs to the technical field of performance testing of asphalt in highway engineering, and in particular relates to a method for measuring cohesion of asphalt. Background technique [0002] Cohesion, also known as cohesion, refers to the mutual attraction between adjacent parts of the same substance. This mutual attraction is a manifestation of the molecular force between molecules of the same substance. Therefore, cohesion can also be considered The force is the shear strength of the material without any normal stress on the failure surface. Cohesion can make substances gather into liquid or solid, especially in the liquid adhesion layer in contact with solid, due to the difference in the relative size of cohesion and adhesion, the liquid can infiltrate the solid or not infiltrate the solid. In asphalt mixture, the bonding effect between asphalt and aggregate is the principle. Therefore, the strength of asphalt mixture is not only rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/04
Inventor 王春张喜艳
Owner CHANGAN UNIV
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