(11) EP 2 767 521 A1
(43) 20.08.2014 Bulletin 2014/34
(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...