CEMENT COMPOSITION WITH LOW HEAT OF HYDRATION

CEMENT COMPOSITION WITH LOW HEAT OF HYDRATION

PROBLEM TO BE SOLVED: To provide a cement composition which improves mid-term and long-term strength development of concrete of age of 7 days and/or 28 days without increasing heat of hydration, in "general-purpose cement" such as ordinary portland cement. SOLUTION: The cement composition...

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Hauptverfasser: YUGE SACHIO, ITO TAKAYASU, CHIKAMA NOBUOKI
Format: Patent
Sprache:eng
Schlagworte:
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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creator YUGE SACHIO
ITO TAKAYASU
CHIKAMA NOBUOKI
description PROBLEM TO BE SOLVED: To provide a cement composition which improves mid-term and long-term strength development of concrete of age of 7 days and/or 28 days without increasing heat of hydration, in "general-purpose cement" such as ordinary portland cement. SOLUTION: The cement composition includes a C3S content of 45 to 65 mass% and a C3A content of 8 to 12 mass%, and in which a free lime ratio expressed by formula (1) is ≤1.0% and a water-soluble Cr(VI) generation ratio expressed by formula (2) is ≤10%; the free lime ratio(%)=a free lime content÷(a CaO content in the cement-0.7×an SO3content in the cement-56×a C content in the cement÷12)×100% ... (1), and the generation ratio (%) of the water-soluble Cr(VI)=the water-soluble Cr(VI)÷the total Cr×100% ... (2). COPYRIGHT: (C)2009,JPO&INPIT
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SOLUTION: The cement composition includes a C3S content of 45 to 65 mass% and a C3A content of 8 to 12 mass%, and in which a free lime ratio expressed by formula (1) is ≤1.0% and a water-soluble Cr(VI) generation ratio expressed by formula (2) is ≤10%; the free lime ratio(%)=a free lime content÷(a CaO content in the cement-0.7×an SO3content in the cement-56×a C content in the cement÷12)×100% ... (1), and the generation ratio (%) of the water-soluble Cr(VI)=the water-soluble Cr(VI)÷the total Cr×100% ... (2). 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subjects ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
title CEMENT COMPOSITION WITH LOW HEAT OF HYDRATION
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