DefinePK

Abstract

Most studies regarding hot mix asphalts (HMA) are carried out with the purpose of evaluating their short-term mechanical resistance (in their initial state, just manufactured in the laboratory). However, the mechanical parameters of said mixes change when they age. This study carried out an experimental phase aimed at evaluating the effects of aging in mechanical resistance (under monotonic and cyclic load), moisture damage resistance and abrasion resistance of an HMA. For this purpose, Marshall, Indirect Tensile Strength, resilient modulus, permanent deformation, fatigue and Cantabro tests were performed. In order to simulate mix aging, STOA (Short Term Oven Aging) and LTOA (Long Term Oven Aging) processes were carried out as described according to the AASHTO R30 specification. A general conclusion drawn through the study is that when the HMA mix ages, it increases its resistance under monotonic and cyclic load, where it can be considered to have a good performance under certain conditions (e.g., high temperature climates and in pavements with thick asphalt layers). However, in regards to aspects associated to durability, the HMA can display undesirable behaviors (reduction of moisture damage resistance and abrasion resistance).