A new dynamic apparatus for asphalt mix fatigue and stiffness modulus: development, validation and numerical simulations

Materia

article

Breno Salgado Barra¹  Leto Momm¹  Yader Alfonso Guerrero Pérez¹  Alexandre Mikowski¹  Helena Paula Nierwinski¹  Rodrigo Shigueiro Siroma¹  Mai-Lan Nguyen²  Gary Hughes³  Gustavo Garcia Momm⁴ 

[1] Universidade Federal de Santa Catarina;Université Gustave Eiffel;University of California;Petrobrás

关键词: Rheological-mechanical performance evaluation;    Complex modulus;    Fatigue;    Asphalt mix;    Pavement design;   

DOI  :  10.1590/S1517-707620220001.1330

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The main aim of this paper is to describe the development and validation of a new test apparatus for measuring complex stiffness modulus and fatigue of asphalt mix, so-called FADECOM. Both evaluations are executed with cyclic loading and continuous modes, in order to demonstrate the effectiveness of test results when applied to asphalt pavement design solutions. Results obtained with the new apparatus are compared to existing methods designed on the same mechanical principles, and which are already calibrated and taken as international standardized references. Methods presented in this paper are based on Discrete Fourier Transform (DFT) analysis of data recorded by the test apparatus; a parametric code which executes the analysis was implemented in C++. Interlaboratory comparisons of test results with FADECOM indicate random deviations of approximately 3 microstrains (x 10-6 µdef) for determination of fatigue strain at 106 cycles, and less than 10% relative difference for complex stiffness modulus. Agreement with FADECOM demonstrates direct applicability of the new method for obtaining accurate data for dynamic numerical simulations comprising asphalt pavement design.

【 授权许可】

CC BY