Precast concrete object
(10) EP4122901A1
(22) 17.03.2021
(43) 25.01.2023
(57) A precast concrete molded body which is a cured product of a concrete composition, comprising: a microcapsule with a core-shell structure having a core made of a water repellent organosilicon material selected from a group consisting of organosilanes, organosilane partial condensation products, and branched siloxane resins, and a shell made of a silicon-based network polymer containing silica units; cement; and at least one type of aggregate; wherein the concrete composition contains 0.01 to less than 0.5 parts by weight of microcapsules per 100 parts by weight of cement. Thereby, a precast concrete molded body can be provided, having high strength, as well as at least one of the following properties: air content stability, substance penetration prevention, and freeze-thaw resistance.
(71) Dow Toray Co., Ltd., JP
