Warm Mix Asphalt (WMA) evaluated using different stiffness modulus measuring methods
DOI:
https://doi.org/10.24425/ace.2025.156160Abstract
This study evaluates and compares the results of two distinct stiffness measurement methods – Direct Cyclic Compression test (DCC) and Indirect Tensile test (IT-CY) – applied to warm mix asphalts (WMA) reinforced with basalt fibres intended for the construction of durable and high performance pavements, specifically surface and road base layers. The asphalt mixtures analyzed comprised surface course asphalt concrete and high modulus asphalt concrete. The production process employed reduced temperatures during both manufacturing and paving, facilitated by the use of a bio-derived fluxing additive and the foaming of the bituminous binder. These mixtures incorporated polymer modified bituminous binders and dispersed fibre reinforcement. Their performance was compared against that of traditional hot mix asphalt (HMA) mixtures. The findings revealed that the direct compression modulus provided a more effective differentiation of mixtures based on the impact of fibre reinforcement. Conversely, the indirect tensile stiffness test highlighted greater variability due to differences in production techniques (HMA vs. WMA) and compaction temperatures. These differences were attributed to variations in the volumetric properties of the samples, influenced by the compaction process. Regarding performance, fibre reinforcement enhanced the complex stiffness modulus across all mixtures. However, the adoption of the WMA technique significantly reduced this parameter. Laboratory test results were further compared with data obtained from samples collected from an experimental road section.References
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