Low water content plastic composition comprising hydraulic cement and method for manufacturing same

A method for manufacturing a plastic composition with a low water content comprising hydraulic cement comprising:

• mixing hydraulic cement, water, and polyol and isocyanate compound, as ingredients for forming foamable polyurethane to obtain a flowable homogeneous mixture;
• polymerizing the flowable homogeneous mixture to discharge free water present between cement particles based on foaming force and thereby phase-separate liquid water from a plastic composition containing the foamable polyurethane and hydraulic cement and losing flowability;
• and
• removing the phase-separated water to obtain the plastic composition,
• wherein water and polyol are mixed with the hydraulic cement before the isocyanate compound is mixed with the hydraulic cement.