Managing risks of precast concrete supply chain: a case study Jati Utomo Dwi Hatmoko, Mochamad Agung Wibowo, Marita Dewi Astuty, Desy Ratna Arthaningtyas and Moh Nur Sholeh MATEC Web Conf., 270 (2019) 05004 Published online: 22 February 2019 DOI: 10.1051/matecconf/201927005004