Abstract
ABSTRACT In this paper, the results of a research project examining the effect of glass aggregate and hydrated lime content on linear viscoelastic (LVE) properties are presented. Three glass aggregate contents (0%, 20% and 60%) and two hydrated lime contents (0%, 2%) were studied for a total of six different asphalt mixtures. All mixtures were fabricated in the laboratory using a PG70-28 polymer-modified binder. LVE properties were measured with the complex modulus (E*) test (tension compression on cylindrical specimens) at different temperatures (−35°C to +35°C) and frequencies (0.01 Hz to 10 Hz). Experimental E* test results were modelled with the 2S2P1D model. The Partial Time-Temperature Superposition Principle (PTTSP) was applied with good precision. Differences in terms of LVE properties were found for mixtures with glass aggregate compared with conventional mixtures. The glassy modulus, as well as the complex modulus norm, was decreased due to the glass aggregates. Moreover, the normalisation of the E* results showed that adding 60% glass changes the LVE properties. No notable effect related to the hydrated lime content was observed.
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