FREEZE-THAW RESISTANCE PRECAST CONCRETE PRODUCTION METHOD, AND PRECAST CONCRETE PRODUCED BY FREEZE-THAW RESISTANCE PRECAST CONCRETE PRODUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a production method of freeze-thaw resistance precast concrete excellent in freeze-thaw resistance, and precast concrete produced by the freeze-thaw resistance precast concrete production method.;SOLUTION: In precast concrete, freeze-thaw resistance can be heightened remarkably by devising a kneading method. In production of precast concrete, shape holding of fine bubbles in concrete becomes possible by using a double mixing method for producing concrete by adding aggregate after kneading only a cement paste at a prescribed water specific by entraining air by an AE agent, to thereby improve freeze-thaw resistance in comparison with a conventional production method.;COPYRIGHT: (C)2014,JPO&INPIT