Peculiarities of Structure and Composition of Boundary Layers of Concrete and Fiber with Modified Surface UDC 691.328; 669.697 https://doi.org/10.24411/2079-7958-2018-13508… https://vestnik.vstu.by/eng/issues/issue_35/chemical_engineering_and_ecology/peculiarities-of-structure-and-composition-of-boundary-layers-of-concrete-and-fiber-with-modified-surface/