PSI - Issue 39

Alice Sirico et al. / Procedia Structural Integrity 39 (2022) 494–502 Author name / Structural Integrity Procedia 00 (2019) 000–000

501

8

P_3

5% peak load (a)

100% peak load

75% peak load

50% peak load

25% peak load

10% peak load

V10_3

5% peak load (b)

100% peak load

75% peak load

50% peak load

25% peak load

10% peak load

Fig. 6. Crack development around the notch obtained from DIC, for different post-peak loading stages for specimens (a) P_3 and (b) V10_3

4. Conclusions MSWI bottom ash subjected to a vitrification process can be successfully used as partial cement replacement to develop “green concretes”. This process allows increasing the recycling rate of this by-product and at the same time reducing the environmental impacts of the concrete industry, mainly related to the carbon dioxide emissions during cement production but also to raw materials consumptions. The performed experimental program shows that the vitrified material, ground at micrometers size, can be used in concrete admixture as cement replacement up to 20% by weight of cement, since it does not compromise the final mechanical performances, in particular in terms of flexural and fracture behavior of concrete. The vitrification process is surely a promising technology, since it allows eliminating toxic and dangerous compounds for humans and environmental health, preventing at the same time the durability problems related to the detrimental reactions that the MSWI ash tends to develop with cement. Acknowledgements This work was financially supported by Emilia Romagna Region in the framework of 2014/20 POR-FSE project “CALCINVETRI: Development of eco-sustainable concretes with aggregates from vitrified Municipal Solid Waste Incinerated ash”, grant number 2019-13554/RER. Authors gratefully acknowledge also Cementirossi SpA and Pizzarotti & C. SpA for providing raw materials for specimen preparation.