Damage Accumulation in Asphalt Concrete Under Compression

Published on Dec 10, 2018
· DOI :10.1007/978-3-030-19756-8_87
Natalya Aleksandrova2
Estimated H-index: 2
(Siberian State Automobile and Highway Academy),
Vasiliy Chusov2
Estimated H-index: 2
(Siberian State Automobile and Highway Academy),
Yuriy Stolbov1
Estimated H-index: 1
(Siberian State Automobile and Highway Academy)
Source
Abstract
The analysis of methods for determining the damage of solids from external loads is performed, and the possibility of their application to asphalt concrete is estimated. As a result, it was found that the principles of deformation and energy equivalence are the most acceptable methods for determining damage. The strength criteria and conditions for plasticity of asphalt concrete are given, obtained by the authors by entering damage into the equations of the limiting state of solids. The method of testing asphalt concrete by compression is described, and the rules for processing the results in determining damage are given. As a measure of the stress state, a new relative characteristic has been introduced kσ, determined by the ratio of the stress difference and the limit of proportionality to the difference of strength and proportionality limits. It is proved that if this characteristic is equal to one, the damage reaches the highest effective value, which is less than one. A further increase in damage occurs when the load on the sample decreases. Thus, an effective range of damage variation has been established, within which accumulated damage does not lead to the exhaustion of the strength resource of the asphalt concrete sample. Mathematical models describing the relationship of damage with a new measure of the stress state kσ are obtained.
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