Evaluación del comportamiento físico-mecánico de un asfalto modificado con ceniza de cascarilla de arroz

Abstract

The rate of vehicular growth and biodiversity of climates present in Ecuador influence the wear of flexible pavement, prompting to explore new mechanisms of action to improve them. For this reason, this research focuses on the use of rice husk ash (RHA) in AC20 asphalt cement, with the objective of evaluating its physical-mechanical properties, through laboratory tests. Based on the supply of rice husk (waste), from national rice production, quantified at 20%, which can be used. The analysis of the suitability of the use of RHA was carried out in three stages: obtaining and verification of the stone materials, AC20 tests without and with the addition of 6.00%, 6.50%, 7.00% of RHA and the Marshall method for the preparation of hot asphalt mixtures. The results indicate that the addition of 6.50% RHA conferred better performance to the binder, generating increases in penetration, viscosity, flash point and softening point in percentages of 4%, 20%, 9% and 10% respectively, compared to the same properties of AC20 without the addition. However, a decrease in ductility was evidenced, with a decrease of 70%. On the other hand, the stability, flow and density of the pavement in percentages of 12%, 13% and 0.51% respectively, therefore, it is affirmed that the addition of 6.50% RHA is beneficial for the pavement.