Description
Miguel A. Franesqui a, Juan Gallego b, Jorge Yepes a, Cándida García-González a
ABSTRACT. Crumb rubber modified (CRM) binders have shown to improve the performance of some bituminous mixtures. In volcanic regions the aggregates are frequently obtained from rocks with a vesicular or scoriaceous structure with high porosity, but the higher absorption, variability and heterogeneous properties make these aggregates marginal and not recommended for structural materials due to the technical specifications. The use of rubber-modified binders in mixtures with these aggregates can contribute to utilize both wastes. However, the production and compaction temperatures of asphalt-rubber mixtures are higher than when using conventional bitumen as the rubber provides a greater viscosity, reducing workability. Consequently, it produces higher energy consumptions and emissions, which compromises its environmental sustainability.
This study presents the principal engineering properties of low temperature asphalt mixtures with rubber-modified bitumen (asphalt-rubber warm mixes, ARWM) and high porosity vesiculated and scoriaceous basalt. The temperature reduction was carried out using a liquid surfactant chemical additive in reduced proportion (0.5% by bitumen weight). The results show that with this additive it is possible to lower the production temperatures of the mixtures with asphalt-rubber and porous volcanic aggregates while the mechanical performance is within the specifications for pavements. The results obtained may be extrapolated to other volcanic regions both insular and continental areas where this type of aggregate is commonly found.
KEYWORDS: Bituminous mixture, Volcanic aggregate, Vesicular basalt, Asphalt-rubber warm mixture (ARWM), Low-temperature mixture, Crumb rubber modifier (CRM), Reclaimed tyre,
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