Current Status of Degraded Road Bridge Slab Located in Mountainous Area Yuji Maki, Tuan Minh Ha, Saiji Fukada, Kazuyuki Torii and Ryohei Ono MATEC Web Conf., 206 (2018) 01019 Published online: 19 September 2018 DOI: 10.1051/matecconf/201820601019