fresh concrete, dry mix, concrete building element or prefabricated element, and method for preparing 1 m3 of fresh concrete

摘要

the invention relates to fresh concrete containing in 1 m3 135 to 250 kg of water, 135 to 400 kg of cement or 135 to 455 kg of a mixture of cement and cement substitutes in a ratio of cement to cement substitutes of 30 : 70 to 70:30, 28 to 52 kg of microsilica and 1,000 to 2,000 kg of aggregate with a fraction up to 16 mm, or up to 8 mm, so that 70 to 100% of this aggregate is formed by brick or ceramic or recycled mixed produced from inert construction and demolition waste with a fraction of 0 to 16 mm, or 0 to 8 mm and / or recycled concrete with a fraction of 0 to 16 mm or 1 to 16 mm or 0 to 8 mm or 1 to 8 mm. a possible remaining part of the aggregate, up to a maximum of 30% by weight, is formed by natural aggregate with an upper fraction of up to 16 mm or up to 8 mm. another from 0 to 30% by weight of the aggregate can be produced from at least one known improved component that improves thermal and / or acoustic properties and / or fire resistance of concrete and which is commonly used in standard concretes. the invention also relates to a dry mixture for the preparation of that concrete, as well as a concrete product or a prefabricated element produced from that concrete. moreover, the invention relates to a method for preparing that fresh concrete.