Finite Element Modelling of Thermal Stress Restrained Specimen Test

2012-06-13
Quadır, Adnan
Güler, Murat
Low temperature cracks are developed when the temperature of pavement falls below zero degrees Celsius or when the variation in daily air temperatures becomes significant in the field. Various experimental techniques have been suggested to simulate low temperature cracking of asphalt concrete in the laboratory, out of which the thermal stress restrained specimen test (TSRST) is one of the well-known test methods. A research was carried out to model the TSRST using the finite element approach and to calculate the maximum stresses and corresponding strains near failure during testing. Test specimens were prepared with two different aggregate sources and gradations. Dynamic complex modulus tests were conducted to determine the relevant material properties necessary for the finite element analysis. A finite element model was then developed in Abaqus® for the specimens tested in TSRST setup to calculate the thermal stresses and strains near failure. The results of analysis showed that the test specimen can be successfully modelled using the finite element method to calculate maximum stress and corresponding strain in TSRST testing. The strains developed become smaller for limestone aggregate mixtures with higher fracture strength values. In terms of the effect of gradation, fine graded mixtures display smaller strains near failure. It is believed that smaller strains calculated indicate brittle behaviour of mixtures under thermal loading.
Citation Formats
A. Quadır and M. Güler, “Finite Element Modelling of Thermal Stress Restrained Specimen Test,” presented at the 5th Eurasphalt & Eurobitume Congress, (13 - 15 Haziran 2012), 2012, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/83674.