Pengaruh Variasi Panjang Serat Terhadap Flowability dan Extrudability Mortar Komposit Serat Rumput Payung (Cyperus Alternifolius) Untuk Aplikasi Beton Cetak 3 Dimensi

The optimization of road alignment has become increasingly important due to the continuous growth in traffic volume and the rising demand for efficient travel time. Road optimization considers several key factors, including traffic volume, population growth, and regional development, to ensure that transportation infrastructure remains functional and capable of meeting future mobility demands. The Malang–Batu corridor is characterized by mountainous terrain and hilly topography, requiring an appropriate geometric road design to determine the shortest feasible route while maintaining compliance with the Indonesian Bina Marga geometric design standards. This study developed a geometric road alignment model by applying Bina Marga specifications, in which the first horizontal curve was designed using the Spiral–Circle–Spiral (SCS) configuration, the second curve employed the Spiral–Spiral (SS) configuration, and the third curve utilized the Spiral–Circle–Spiral (SCS) configuration. The primary objective of this study was to determine the minimum achievable route length through variations in horizontal alignment parameters. The modeling results indicate that the shortest route length obtained was 1,101.17 m. The optimal horizontal alignment consisted of an SCS curve at Point A, an SS curve at Point B, and an SCS curve at Point C, whereas the vertical alignment followed the existing terrain conditions, incorporating both crest and sag vertical curves. These findings demonstrate that optimizing horizontal alignment parameters can effectively minimize route length while satisfying the geometric design requirements established by the Bina Marga standards.