QUICK-SETTING AGENT

PROBLEM TO BE SOLVED: To provide a quick-setting agent improved in quick setting property while making a sprayed concrete densified and keeping long time strength development (material age: 28 days) by adding a quick-setting agent to base concrete mixture for keeping plasticity and preventing genera...

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Main Authors NISHI KAZUNORI, NAKAJIMA YUTAKA, YUKI WATARU, SUGIYAMA AKINORI, MOHOGUCHI TAKESHI, OGAWA YOJI, YAMAMOTO MORIO
Format Patent
LanguageEnglish
Published 25.09.2003
Edition7
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
LIME, MAGNESIA
METALLURGY
MINING
REFRACTORIES
SHAFTS
SLAG
TREATMENT OF NATURAL STONE
TUNNELS
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Summary:PROBLEM TO BE SOLVED: To provide a quick-setting agent improved in quick setting property while making a sprayed concrete densified and keeping long time strength development (material age: 28 days) by adding a quick-setting agent to base concrete mixture for keeping plasticity and preventing generation of stiffening. SOLUTION: The quick-setting agent comprises calcium aluminate (preferably amorphous), a sulfate ()e.g. gypsum), and sodium aluminate (Na2O/Al2O3: <1.0 in mol an ratio), and usually comprises high-early-strength Portland cement, etc., wherein (1) the amount of Na2O in the agent is 1.5-10.0 mass%, and (2) to the total amount of calcium aluminate, the sulfate and sodium aluminate of 100 pts.mass, the amount of the Portland cement is ≥1.0 pts.mass. COPYRIGHT: (C)2003,JPO
Bibliography:Application Number: JP20020072336