12th International Society for Asphalt Pavements Conference (ISAP 2014), North Carolina, United States Of America, 1 - 05 June 2014
The purpose of the study was to collect data on mix design, quality control procedures (scope Marshall test, core sampling) and evaluation performance (including rutting, indirect tensile strength) of three Stone Mastic Asphalt (SMA) pavements that had been constructed in Istanbul. In addition, the current situation of these sections has been observed and is presented in this study. The paper compares the performance of the SMA mixes with a focus on aggregates. Three types of aggregates, namely Cebeci dolomite limestone, Gölcük sandstone and Karatepe basalt, were considered. Basalt stone is difficult and high cost to quarrying and its reserves are limited around Istanbul. Usability of alternative types of aggregates in SMA mixes is considerable subject to be investigated. In this study, primarily some important material properties of coarse aggregate, such as sieve analysis, Los Angeles abrasion loss, soundness of aggregate by Na2SO4, flatness index, stripping strength, specific gravity, water absorption and SMA mixes, was designed according to Turkish Highway Technical Specifications, were determined. The results showed that basalt stone except for the flatness index and stripping strength provides higher values than Cebeci dolomite limestone and Gölcük sandstone. However, in terms of resistance to permanent deformation, Marshall test results of designed and manufactured SMA features indicate that, Dolomite limestone SMA mix and Sandstone SMA mix an alternative mixes are an alternative to Basalt SMA mix.
Keywords: Stone Matrix Asphalt, SMA, Turkey, pavement performance, aggregate.