Testing and modeling of bituminous mortar response

Abstract

A dynamic shear rheometer (DSR) setup, with a modified test geometry specifically developed for the mortar, was used to conduct time and frequency domain tests. The mortar was composed of a pure bitumen, filler and fine fractions of sand. In the test setup two mounting procedures were compared and the one that delivers better test result repeatability was selected. Test results obtained from frequency domain tests were used to construct a master curve using time-temperature superposition principle (TTS). Time domain material functions were obtained from the master curve by using frequency-time domain inter-conversion. In this process a series of Kelvin-Voigt element were used. Using material parameters obtained from frequency domain results, creep-recovery tests in time domain were simulated using a Matlab program. Results show a very good agreement with experimentally obtained creep-recovery data.

Keywords

DSR / mortar response / master curve / Kelvin-Voigt

References

[1] Christensen DW and DA Anderson, 1992. Interpretation of dynamic

[2] Ferry JD. 1980. Viscoelastic Properties of Polymers[M]. 3rd edition, New York

[3] Mechanical Test Data For paving Arade Asphalt Caments[J] J. Assoc. Asphalt Paving. Technol., 1980, 61: 67-116.

[4] Huurman M, Mo LT and Woldekidan MF. 2009. Unravelling Porous Asphalt Concrete, Towards a Mechanistic Material Design Tool Int[J]. Journal Road Materials and Pavement Design, ICAM 2009, Volume 10, Special Issue 2009

[5] Huurman M, Mo L, Woldekidan MF, Khedoe RN. en Moraal, J. Overview of the LOT Meso Mechanical Research into Porous Asphalt Raveling[C]. Proceedings of the 7th Int. RILEM Symposium Advanced Testing and characterization of Bituminous Materials, Rhodes, Greece, 2009

[6] Khedoe R., Moraal J. Sample Preparation and Laboratory Testing for the LOT Research Program[R], 2007 the Netherlands Laboratory of Road and Railway Engineering, Delft University of Technology

[7] Schapery R.A., Park S.W. Methods of Interconversion Between Linear Viscoelastic Material Functions. Part II-Approximate Analytical Method[J]. International Journal of Solids and Structures, 1999, 36: 1677-1699.

[8] Schapery RA. A Simple Collocation Method for Fitting Viscoelastic Models to Experimental Data[J]. Calif. Inst. Tech., 1961, GALCIT SM 61-23A

[9] Tschoegl N.W. The Phenomenological Theory of Linear Viscoelastic Behavior[R], 1989 New York Springer