Fracture parameters of concrete after exposure to high temperatures: pilot tests Hana Šimonová, Petr Halfar, Iva Rozsypalová, Petr Daněk and Zbyněk Keršner MATEC Web Conf., 107 (2017) 00039 Published online: 24 May 2017 DOI: 10.1051/matecconf/201710700039