Steel Waste Valorisation - Steel Slag Waste Effect on Concrete Shrinkage Maria Eugenia Parron 1(&) , Maria Dolores Rubio Cintas 1 , Miguel José Oliveira 2 , Elisa M. J. Silva 2 , Francisca Pérez García 3 , and Jose Manuel Garcia-Manrique 3 1 University of Cadiz, Cádiz, Spain mariaeugenia.parron@uca.es 2 University of Algarve, Faro, Portugal 3 University of Malaga, Málaga, Spain Abstract. Concrete is one of the most widely used construction materials in the world. The production of Portland cement, an essential constituent of concrete, leads to the release of significant amounts of CO 2 . The global production of concrete represents more than 5% of the anthropogenic emissions of carbon dioxide every year, mainly from the production of cement. The replacement of cement by fly ash and other industrial waste, such as steel slag, is a good example of how resource conservation can be improved and contamination can be reduced. Future trends predicts an increment of the demand for steel, worldwide. The steelmaking process produces slags, ranging from 10 to 15% per ton of steel, however its reutilization is still reduced, being deposited in landfills. The technical feasibility of replacing a large part of the cement with blast furnace slag gave good results, nevertheless, it is crucial to study the short and long term shrinkage evaluation. Shrinkage crack reduction is an important factor on the durability point of view, as well as on its strength. This study, conducted by the TEP-951 Cadiz research group, presents labo- ratory test results on the total and autogenous shrinkage of medium strength concrete, with partial replacement of cement by slags. Different slags were tested, namely ladle furnaces slags (LFS) and ground granulated blast furnace slags (GGBFS). The results hereby presented do not reveal significant diver- gences on the concrete shrinkage, for both slags. The percentage of slags used on both mixtures is the same and correspond to 25%. Keywords: Concrete  Shrinkage  Cement replacement  Slags  Circular economy 1 Introduction The increase of waste, generated from industrial activity, is unavoidable. Dealing with this complex problem has become a dif ficult issue, and worldwide, construction is a high consuming sector. Construction activity is responsible for the depletion of more than 40% of the energy and more than 50% of natural resources. Also, the construction sector is responsible for the production of 50% of the global waste [1]. © Springer Nature Switzerland AG 2020 J. Monteiro et al. (Eds.): INCREaSE 2019, pp. 826–835, 2020. https://doi.org/10.1007/978-3-030-30938-1_64