Investigating linear viscoelastic response of cylindrical and prismoidal bituminous mixtures subjected to torsion using dynamic shear rheometer
Source abstract
Abstract
This study investigates the influence of specimen geometry on the linear viscoelastic (LVE) properties of bituminous mixtures in torsion using a dynamic shear rheometer. Cylindrical and prismoidal specimens with identical material constituents and volumetric properties are prepared using a shear box compactor. Amplitude sweep tests show that LVE limits decrease with increasing temperature, with prismoidal specimens exhibiting higher LVE limits. The frequency-dependent response and relaxation characteristics are analysed through isothermal and master curve analysis. The results show that prismoidal specimens have a higher shear modulus, relaxation modulus, and longer relaxation times than cylindrical samples. The impact of specimen geometry becomes more significant at higher temperatures and lower reduced frequencies. The study demonstrates the inadequacy of correction factors for addressing geometry-based stresses in prismoidal bituminous mixture specimens. The results show the necessity to relook into ASTM D7552 ((2022). Standard test method for determining the complex shear modulus (G*) of bituminous mixtures using dynamic shear rheometer. ASTM International) for computing the linear viscoelastic properties of bituminous mixtures.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Asphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Civil Engineering, IIT Madras
Funding
Department of Science and Technology, Government of India · Prime Minister's Research Fellowship (PMRF), Government of India
References (47)
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