Effect of aging on AC-WC hot mix recycling asphalt utilizing bituminous waste material

RISMAWANSYAH, Indra, Dr. Ir. Latif Budi Suparma, M.Sc

2010 | Tesis | S2 Magister Sistem Teknik

Nowadays, the conservations of materials, environmental issues, and costs effective are three major issues in pavement construction, rehabilitation and maintenance. Asphalt pavement recycling is one of the procedures that eminently and realistically meets these issues because of the economical in terms of energy and materials usage. The reuse of existing asphalt cement in Reclaimed Asphalt Pavement (RAP) may reduce the amount of new asphalt cement required for pavement construction. However, the reuse of aged asphalt cement combined with new asphalt cement will also experience aging in its service life. This research is investigating the effects of aging to AC-WC hot mix asphalt recycling using Short Term Oven Aging (STOA) and Long Term Oven Aging (LTOA) method. Finding the choosen composition of RAP and new materials is the first stage in this research. After determining the Optimum Asphalt Content (OAC), then three types of specimen are made : control condition (unaged), STOA and LTOA specimens. All of specimens are tested to determine the Marshall Properties, effect of immersion and Indirect Tensile Stength (ITS) test. The choosen composition of the mixture is 75% RAP : 25% new aggregates with 5.75% asphalt content from total mixture or 1.35% addition of new asphalt cement to the mixture in OAC condition, and the properties of mixture are : density 2.217 gr/cc, VMA 15.48%, VFB 69.47%, VITM 4.73%, stability 1930 kg, flow 3.17 mm, and MQ 617 kg/mm. The result indicated that aging process has changed the characteristics of the mixture. ITS test result shows the decreasing number from 5160 kPa (unaged) to 4723 kPa (STOA) and 4516 kPa (LTOA). Marshall Stability number increasing from 1930 kg (unaged) to 1943 kg (STOA) and 1977 kg (LTOA). Flow number increasing from 3.17 mm (unaged) to 3.50 mm (STOA) and 3.60 mm (LTOA). The Retained Marshall Stability (RMS) for 24 hours immersion decreasing from 98.59% (unaged) to 90.84% (STOA) and 95.28% (LTOA). And the decreasing of Tensile Strength Ratio (TSR) percentage from 79.25% (unaged) to 76.38% (STOA) and 66.04% (LTOA).

Kata Kunci : Asphalt Recycling Pavement, Aging, Marshall Properties, Durability, Indirect Tensile Strength