Patent CA-2050928-A1 (CA)
Title: Method for producing and curing hydraulic material and curing chamber and paint
Inventor: MITSUO KOJI
IPC: C04B41/50
Filed: 1990-03-16
Abstract: Abstract Either of the hydraulic material; method of producing and curing hydraulic material; and coating of this inven-tion is to prevent cracking, makes hydraulic material of higher-strength and of  difficultly-water-absorbent and efflorescence-controlled by controlling water and efflo-rescence ingredient in hydraulic material.    Method of producing hydraulic material in Claim 1  is to produce hydraulic material using aqueous solution of lime instead of water.  Since water evaporates slowly, cement gel produces during the course of evaporation. Therefore, it makes hydraulic material of higher-strength compared with the case where water is used, especially in case of air-curing.  It is suitable for field works. Finer calcium carbonate produces at inner wall of voids created by evaporation of water, thus, the material is of less-water absorbent.  Alkalis in the hydraulic material is preserved, thus the material is durable.  In curing method of Claim 2, one or more than two of selected from reaction agent, reaction liquid and emul-sion of synthetic resin type added by reaction agent is impregnated in the manner that the liquid does not col-lect  at  the surface of the hydraulic  material  thereby inner efflorescence and/or impregnated aqueous solution of lime reacts with reaction agent or carbon dioxide. Thus, in case reaction agent is impregnated, efflores-cence ingredient is consumed thereby efflorescence is controlled.   In  case emulsion of synthetic  resin  type added with reaction agent is impregnated, synthetic resin forms film thereby makes hydraulic material of difficult-ly-water-permeable.  In case aqueous solution of lime is impregnated, water evaporates slower, thus, layer of calcium carbonate is formed at inner wall of voids creat-ed by evaporation of water, and low-water-absorbent hydraulic material is obtained.  In all of these, the material get higher-strength by replenishing deficient water.     In curing method of Claim 3, hydraulic material is subject to high-pressure-curing, or curing at alterna-tively at 100% humidity and below, or high temperature curing  using  hydration heat in a  sealed  chamber  and release the chamber after temperature of hydraulic mate-rial descends to substantially normal temperature, there-by control movement of efflorescence ingredient to the surface of the hydraulic material and promote hydration. In  this  method, first and second efflorescence  can  be controlled, and higher-strength is achieved.    In the curing method of Claim 4, curing is made by replenishing efficient water immediately after pre-hardened hydraulic material does not break loose notwith-standing  water or hot water added thereto, curing  while suppressing evaporation of water from the hydraulic material.  Much cement gel is produced, which extends into voids created by evaporation of water, thus, diame-ter of the voids becomes smaller.  The material is of higher-strength and low-water-absorbent.    In curing method of Claim 5, water or hot water is replenished as deficient water or solvent of efflores-cence ingredient prior to or during curing at the curing while suppressing evaporation of water.  Much cement gel produces, thus, resultant material is of higher-strength, diameter of voids created by evaporation of water is less, layer of finer calcium carbonate is formed at inner wall of the voids. Material is of low-water-absorbent or difficultly-water-absorbent.    In curing of Claim 6, pre-hardened hydraulic material is subject to curing conducted while suppressing evapora-tion of water and/or curing approximately lower than 50°C, and steam-curing after demolding.   Steam-curing after demolding improves strength.    In curing method of Claim 7, hydraulic material of in difficultly-water-absorbent and/or wherein water-repel-lent film is formed at the outer surface thereof is obtained.  The material can be coated by paint.  Thus, it can be protected double and of durable nature.     In curing chamber of Claim 8, heat generator is located at the ceiling thereof, by which, high-tempera-ture zone may be formed at the portion under the ceiling. Even in case of steam-curing when humidity is 100% in the chamber, no dewing occurs at the ceiling, evaporation of water due to decrease of humidity due to dewing being prevented, thus improved curing is achieved.    In curing chamber of Claim 9, one or more than two of selected from humidifier, sprinkler, evaporator, dehumid-ifier, heater at ceiling and heater at wall is provided in addition to steam generator and temperature control-ler.  By controlling temperature within the chamber, curing of 100% humidity can be conducted at desired temperature.   Moreover, deficient water can  be  replen-ished by evaporator or liquidation by dehumidifier. Further, by this chamber, curing at alternatively 100% humidity and lower can be achieved by means of dehumidi-fier.  By heat generator at ceiling or wall prevent dewing, and indirectly serves for suppressing evaporation of water from the hydraulic material.    In curing chamber of Claim 10, water vessel is con-nected with  other water vessel or vessel for supply water by means of pipe equipped with pump.  Water or reaction  liquid is replenished without transferring  the hydraulic material.  Moreover, curing alternatively at 100% humidity and lower can be easily conducted.  This chamber is useful for making hydraulic material of diffi-cultly-water-absorbent or higher-strength.    Painting  of Claim 11 is prepared by adding  reaction agent and coloring agent to slurry of cement or emulsion of synthetic resin type.  In the paint prepared by adding reaction agent to slurry of cement, efflorescence is con-trolled.  In the paint prepared by adding reaction agent to the emulsion, reaction agent impregnates into  hydrau-lic material, reacts with efflorescence ingredient. Thus, efflorescence is controlled.    Painting of Claim 12 is prepared by excluding efflo-rescence ingredient from cement or reacting cement with acid.  Efflorescence is controlled.