Method for manufacturing rapid-hardening agent and concrete product

(11) EP 2 767 521 A1

(43) 20.08.2014 Bulletin 2014/34

(22) 29.08.2012

(84) AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(71) Denki Kagaku Kogyo Kabushiki Kaisha Tokyo 103-8338 (JP)

(57) To provide a rapid-hardening additive and a method for producing a concrete product, whereby an initial strength is obtainable even when a mixed cement is used. The rapid-hardening additive comprises a heattreated product which is obtained by heat-treating a mixture of a CaO raw material, a CaSO₄ raw material and at least one raw material selected...

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