The role of chemical admixtures in the formation of the structure of cement stone Viktor Sopov, Lidiya Pershina, Larisa Butskaya, Ekaterina Latorets and Olga Makarenko MATEC Web Conf., 116 (2017) 01018 Published online: 10 July 2017 DOI: 10.1051/matecconf/201711601018