Adhesion of structural steel to concrete with recycled crushed sanitary ceramics aggregate

Today, the use of recyclable materials has been the focus of researchers around the world. The use of re-cycled concrete aggregates, although beneficial for environmental reasons, brings many problems. One of the basic factors is the presence of old mortar and impurities in these aggregates. Therefore, it is necessary to conduct comprehensive studies in this field. Hence, the paper presents the results of testing the adhesion of B500SP structural steel to concrete subjected to thermal loads in the range of 300–700°C. The concretes were designed exclusively based on waste aggregate made of precious waste ceramics and two types of cement: CEM I 42.5 R portland cement and Górkal 70 alumina cement. The method of direct pulling of a steel rod from the concrete cover (pull-out test) was used in the tests. The test results confirmed that the adhesion of the selected steel grade to concrete based on recycled aggregate does not differ from the results obtained for concrete with natural aggregate.