Performance assessment of repair material for deteriorated concrete slabs using chemically bonded cement

This study provides the physical and durable properties of chemically bonded cements (CBC)-based repair materials containing magnesium potassium phosphate ceramics (MKPC) for concrete slab under laboratory atmospheric conditions, comparing it to the existing calcium sulfoaluminate (CSA) type commercial ultra-rapid hardening cement for concrete repair. Also, this paper presents the field application of MKPC-based repair material. The results obtained from the laboratory tests during the fresh state show similar levels of workability and working time to the commercial repair material. Regarding the physical and durable properties of hardened MKPC-based mortar, it shows more desirable characteristics than the commercial repair material. In the field application, the MKPC-based repair material for cracks demonstrates considerable volume stability for a year, not showing any crack propagation and reoccurrence. Furthermore, for overlay repair, MKPC-based material shows good bonding strength to old substrate concrete slab. Published by Elsevier Ltd.