... devoted to the vapor permeability of cement stone. Materials and methods Cement samples were tested according to GOST 25898-83. The water vapor permeability was determined, using the dried sample. Results The results of the research confirmed the use of hollow glass microspheres (HGM) and dressed hollow glass microspheres (DHGM) as a part of the lightweight cement slurry, from 2.5 to 7.5%; it reduces the water vapor permeability of the stone, and thus, increases the sealness of the well. Сonclusions ...

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