One-year properties of concrete with partial substitution of natural aggregate by cupola foundry slag

Cupola foundry slag has almost no utilisation. There has been no long term experience with the application of foundry slag in concrete production. This paper analyses the potential utilisation of cupola foundry slag. It also presents a proposal for processing and utilising granulated cupola slag from cast iron production in concrete products and the long term (one-year period) verification of its properties as a base for industrial scale application. The wt. 25.5% substitution of 0/4 mm fine natural aggregate by 0/4 mm cupola foundry slag in concrete (CFSC) declares the same or very similar main civil engineering properties when compared to control concrete (CC). The CC and CFSC concrete are not frost resistant according to STN EN 206/NA: 2015 requirement. This lack could be removed by increasing the entrapped air levels from the current 2.0-2.4 volume percent to around 5-6 volume percent in fresh concrete mixture.