| Title |
Preliminary Study on Mix Design and Compaction Method of SMA Pavements |
| Authors |
백종은(Baek, Jongeun) ; 최준성(Choi, JunSeoung) ; 정예지(Jung, YeJi) ; 김현수(Kim, HyunSoo) |
| DOI |
https://doi.org/10.12652/Ksce.2026.46.2.0165 |
| Keywords |
SMA 포장; 골재 맞물림; 타이어 롤러; 포장 다짐; 배합설계 SMA pavement; Stone-on-stone contact; Tire roller; Compaction; Mix design |
| Abstract |
Stone Mastic Asphalt (SMA) provides superior durability and rutting resistance through its skeletal structure, which is characterized by stone-on-stone contact. This study aims to enhance the construction quality of SMA pavements by evaluating a mix design that prioritizes aggregate interlocking and assessing the field applicability of pneumatic tire rollers for compaction. To quantitatively evaluate interlocking, the Voids in Coarse Aggregate (VCA) criterion was applied. Initial assessments of a standard 13 mm SMA mixture revealed insufficient coarse aggregate content. Increasing the coarse aggregate content by 2 percentage points (from 72.7 % to 74.7 %) satisfied the VCA criteria and optimized the stone-on-stone contact. For field application during highway SMA overlays, tire rollers were employed for secondary compaction. To prevent the “pick-up” phenomenon?where the mixture adheres to the tires?anti-adhesion procedures, such as coating tires with vegetable oil and preheating, were implemented. Performance evaluations of the test sections indicated that using tire rollers increased the compaction degree by 0.4 %p, improved interlayer bond strength by 8.5 %, and reduced surface deflection by 16.7 % compared to conventional methods. These results demonstrate that the application of tire rollers significantly contributes to improved compaction efficiency and enhanced initial pavement performance. |