CONCRETE PLACING METHOD

PROBLEM TO BE SOLVED: To provide a concrete placing method which can prevent generation of cold joint between a primary concrete layer and a secondary concrete layer, specifically when a long interruption of concrete placement is unavoidable in such an extent that hardening of the primary concrete l...

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Bibliographische Detailangaben
Hauptverfasser:	YAMATO HIDEOMI, TAMADA YUJI, YOKOO HAJIME, UEHARA NOBUO
Format:	Patent
Sprache:	eng
Schlagworte:	BUILDING BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE FIXED CONSTRUCTIONS FORMS HANDLING BUILDING MATERIALS ON THE SITE REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS SCAFFOLDING SHUTTERING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a concrete placing method which can prevent generation of cold joint between a primary concrete layer and a secondary concrete layer, specifically when a long interruption of concrete placement is unavoidable in such an extent that hardening of the primary concrete layer starts after the placement of the same. SOLUTION: After placement of a primary concrete layer, a setting retarder is added to the surface of the primary concrete layer, before hardening of a surface of the primary concrete layer, by spraying the retarder by means of a spray or applying the same by means of a brush or the like. When a secondary concrete layer is placed, an accelerator is added to the surface of the primary concrete layer before hardening of the same, and then the secondary concrete layer is placed.