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SEM examinations of P cement surface. P cement surface resulted very porous and characterized by a stringy appearance, with interconnected volumes and with the presence of many microreliefs (red circles), cavities (violet circles) and pores (green circles). Typical spherical particles, characterized by a diameter of about 50 μm, were evident inside the cement agglomeration. In P cement, the surface is characterized by micropores and macropores. Scale bars: A), 100 µm; B), 20 µm.
