METHOD OF CONSERVING AND PLACING CONCRETE

摘要

PURPOSE: To obtain the method of conserving and placing concrete proper to long-distance transport and long-term conservation by preventing the deterioration of quality due to the lapse of time of concrete after kneading. ;CONSTITUTION: Fresh concrete C immediately after fresh concrete is kneaded by a batcher plant 4 is charged into form vessels 5, and liquid nitrogen is sprayed against the fresh concrete C through cooling nozzles 8 from liquefied- nitrogen gas bombs 9. Fresh concrete C is quickly frozen at at least -l0°C or lower by the latent heat of vaporization and conserved while fresh concrete C frozen through a thawing equipment 10 is thawed immediately before placing.;COPYRIGHT: (C)1995,JPO