CEMENT-BASED COMPOSITE OBJECT COMPRISING RECYCLED MATERIAL AND METHOD OF MANUFACTURING SUCH AN OBJECT

The invention relates to a method of manufacturing a cement-based composite object (10). The feedstock is mixed to obtain a mouldable concrete which is poured into a mould (9) or onto a moulding surface and allowed to cure. The feedstock components comprise aggregate (1) with a size of at least 4 mm in an amount of 5 to 70 weight % of the total weight of the feedstock, aggregate (2) with a size of 0 to 4 mm in an amount of 5 to 70 weight % of the total weight of the feedstock, cement (3) in an amount of 3 to 20 weight % of the total weight of the feedstock, additives (4) in an amount of 2 to 15 weight % of the weight of the cement, and a balance of water (5). At least 70 weight %, possibly at least 95 weight %, of the total weight of the aggregate is made from recycled material that has been prepared by breakdown, such as crushing, of scrapped products (7,8).