Operational characteristics of limestone and methods to increase its strength Elena Korneeva, Muayad Sabri Sabri Mohanad, Anna Babanina, Egor Zaytsev and Sergey Poberezhskii E3S Web Conf., 91 (2019) 02028 Published online: 02 April 2019 DOI: 10.1051/e3sconf/20199102028