摘要:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a concrete product capable of increasing absorption of carbon dioxide gas.SOLUTION: Porous concrete 3 is charged in a form 1, and carbon dioxide gas is absorbed into the porous concrete 3, thereby increasing carbon dioxide gas absorption of a wave block 12 as a whole. Carbonation is carried out by feeding a gas containing carbon dioxide into the form 1 through a supply tube 6 inserted from an aperture 1a of the form 1, thereby enabling the form 1 itself to serve as a shield and eliminating the need of establishing a curing tank as in conventional carbonation curing. Furthermore, a cement milk 11 is filled and solidified, thereby attaining quality equivalent to that of a normal dense concrete product.
摘要:
PROBLEM TO BE SOLVED: To provide a cement admixture, a cement composition, and a cement mortar using them, in which viscosity is low, there is not aggregate separation, workability is favorable, curing is performed in a short time, and a longer age strength is achieved.SOLUTION: A cement admixture includes: a quick hardening material including calcium aluminate glass or calcium aluminosilicate glass, and gypsum; a setting retarder; spherical silica; colloidal silica; and calcium hydroxide. A cement composition includes: cement; the cement admixture including the quick hardening, the setting retarder, spherical silica, colloidal silica, and calcium hydroxide; and an aggregate. A production method of cement mortar comprises blending: a binding material including the cement and the quick hardening material; the setting retarder; the spherical silica; the colloidal silica; calcium hydroxide; the aggregate; and water.
摘要:
PROBLEM TO BE SOLVED: To supply COinclusion gas of an optimal temperature and humidity to carbonation cure without a lot of power consumption and COdischarge in the carbonation cure using exhaust gas from an outside.SOLUTION: Carbonation cure equipment 1 includes: a cooling part 22 in which COinclusion gas passing a COinclusion gas passage 21 is cooled; and a heat part 24 in which the COinclusion gas passing the COinclusion gas passage 21 is heated after cooling at the cooling part 22, wherein in the cooling part 22, heat exchange of a cooling medium and the COinclusion gas is performed, a temperature of the COinclusion gas is made to a second target temperature set based on a first target temperature and a first target humidity, and humidity is made to 100%, in the heat part 24, heat exchange of a heat medium and the COinclusion gas is performed, thereby a temperature of the COinclusion gas is made to a first target temperature, humidity is made to a first target humidity. The COinclusion gas of an optimal temperature and humidity is supplied to the carbonation cure without a lot of power consumption and COdischarge by the carbonation cure equipment 1.
摘要:
PROBLEM TO BE SOLVED: To provide a concrete composition that can reduce the contraction of concrete, that is also small in slump loss, and that can impart a high crack resistance and to provide a method for producing the same.SOLUTION: Methods for producing: (1) a concrete composition that contains an aggregate formed by subjecting portland cement clinker to carbonation treatment, and a shrinkage-reducing agent, (2) a concrete composition of (1) in which COcontent in the aggregate is 2% or more, (3) a concrete composition of (1) or (2) in which the aggregate is coarse aggregate of 5 to 40 mm and/or fine aggregate of below 5 mm, and (4) a concrete composition that is formed by blending a shrinkage reducing agent into an aggregate formed by comminuting portland cement clinker and subjecting the same to carbonation while immersing in water.
摘要:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a concrete product capable of increasing absorption of carbon dioxide gas.SOLUTION: Porous concrete 3 is placed inside a concrete layer 2, thereby enabling carbon dioxide gas to be absorbed into a carbonated part 13 and increasing carbon dioxide gas absorption of a concrete block 12 as a whole. An outer periphery of the carbonated part 13 is covered with the concrete layer 2 so as not to expose the porous concrete 3 and to maintain a fine appearance as a concrete product. A cement milk 11 is filled and solidified in a gap inside the carbonated part 13, thereby attaining quality equivalent to that of a normal dense concrete block.
摘要:
PROBLEM TO BE SOLVED: To provide a cement admixture and a cement composition that give a good expansion strain without pop-out even when addition of a shrinkage reducing agent is suppressed.SOLUTION: There are provided a cement admixture (1) that includes free lime, a hydraulic compound, anhydrous gypsum, and an expanding agent having 40 mass% or more of a residue on 45 μm sieve and 30 mass% or less of a residue on 90 μm sieve; a cement admixture (2) that is the cement admixture (1) further including the shrinkage reducing agent; a cement admixture (3) that is the cement admixture (2) including 80-95 pts.mass of the expanding agent and 5-20 pts.mass of the shrinkage reducing agent; a cement admixture (4) that is the cement admixture (2) or (3) of which the shrinkage reducing agent contains an alkylene oxide/propylene oxide copolymer and a polyoxypropylene monoalkyl ether; and a cement composition (5) including cement and cement admixtures (1) to (4).