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Micro-structure of hydrophobic coatings A2 on the micro-structure of mortar: (a) A2.8—a visible thin hydrophobic film which has not completely covered perlite grains (×500), (b) A2.4—polysiloxane gel particles (×5000), (c) A2.4—micro-area well-developed C-S-H phase crystals (×104), (d) results of elemental analysis in EDS micro-area from the surface of hydrophobized samples.
