Modification of concrete mix during pressing

According to A.V. Satalkina [1], the Americans pointed out need remove excess water after concrete mixture was placed in a mold at beginning of century. I.N. Akhverdov [2] indicates that process cement paste compression with (W / C) =- 1.65 [W C] particles, displacing water, approach, and relatively low-pressure P = Po 0.065 MPa, solvation shells can touch * (The shell is flattened places mutual contacts between particles *). At large values (P> MPa), mainly diffuse layer squeezed out, its displacement continue until only adsorption remains cement-water system (in this case, will consist connected grains zero). The potential energy expended compressing layers be estimated from general law conservation energy. In compaction, interaction surface solid phase overcome. convergence occur significant expenditure energy, which necessary overcome disjoining pressure. When approach each other, it expend spent on reducing thickness (work desorption), leads appearance repulsive forces particles.