Road basal pelletized material mixture resilient modulus indoor test method and device

Abstract

The invention discloses a road base gravel mixture rebound modulus indoor test method. The steps include that first, test materials are added in a test tube. The second step is sample static pressure molding. The third step is to arrange a miniature bearing plate on the surface of the sample. The fourth step is loading, unloading and rebound modulus test implementation. The fifth step is to read deformation amount. The sixth step is to take a rebound modulus value. The seventh step is to process test data. And the rebound modulus value is obtained. The invention is characterized in that firstly the test tube value taken formula is that the ratio of the diameter of the test tube to the maximum grain size=D / dmax. And the ratio is larger than five. Secondly, the diameter of the bearing plate is three times of the gravel maximum grain size. Thirdly, the mode of the rebound modulus test is that a jack is arranged on the bearing plate. The rebound modulus test is implemented through loading and unloading with a reaction frame. The loading amount is controlled by a test-force ring. The invention also discloses a rebound modulus indoor test device. The invention has the technical effects of strong adaptability, convenient operation and credible test results, which can be applied to general scientific research colleges and design and construction units.

Description

Technical field [0001] The invention relates to a material parameter testing technology, in particular to an indoor testing method and device for the resilience modulus of a road base granular mixture. Background technique [0002] 1. The versatility of aggregate mixture as a road base [0003] Aggregate mixture refers to a non-viscous mixture composed of particles of different sizes such as sand gravel, sand pebbles, crushed stone, gravel, stone powder, etc. It not only has good temperature stability and humidity stability, but also forms the interlocking effect between the particles. The non-linear structure layer has a large bearing capacity and a strong resistance to fatigue damage. It can also effectively absorb the crack tip stress and prevent the semi-rigid asphalt pavement from early cracking and reflection cracks. Therefore, the use of high-quality graded aggregate mixture as the base layer of asphalt pavement has attracted the attention of the engineering community. [...

AI Technical Summary

Problems solved by technology

These methods are all based on accumulated experience, and the elastic modulus obtained is credible within a certain range, but its applicability is limited under other conditions

[0012] The second is mainly on-site testing, such as on-site bearing plate method, Beckman beam method, etc. This kind of testing method is affected by many factors. Difficult to apply to guide pavement design

This shows that compared with the maximum particle size of the pellets, the size of the test cylinder and the pressure head of the bearing plate used in the indoor test method are obviously smaller, and the test cylinder will have a greater restraint force on the deformation of the mixture. Cause the test result to be high, thus distorting the test result

Images