Int. J. Materials and Product Technology, Vol. 56, Nos. 1/2, 2018 169 Copyright © 2018 Inderscience Enterprises Ltd. Self-healing of self-compacting concretes made with blast furnace slag cements activated by crystalline admixture Emilio M. Takagi MC Bauchemie, Aeronautics Institute of Technology (ITA), Marechal Eduardo Gomes, 50, Sao Jose dos Campos, Brazil Email: Emilio.Takagi@mc-bauchemie.com.br Maryangela G. Lima Aeronautics Institute of Technology (ITA), Marechal Eduardo Gomes, 50, Sao Jose dos Campos, Brazil Email: magdlima@gmail.com Paulo Helene University of Sao Paulo (USP), Luciano Gualberto Street, 380, Sao Paulo, Brazil Email: paulo.helene@concretophd.com.br Ronaldo A. Medeiros-Junior* Federal University of Parana (UFPR), Centro Politecnico, Curitiba, Brazil Email: ronaldodemedeirosjr@yahoo.com.br *Corresponding author Abstract: Test samples were examined using a specific crystalline admixture, AR glass fibre and three types of cements with percentages of blast furnace slag (BFS) of 55%, 35% and 0%. Test specimens were loaded under compression until 90% of their failure load, in order to generate a network of micro-cracks. These samples were subsequently immersed in lime water to trigger the self-healing mechanism, followed by various tests at 28, 56 and 84 days. As BFS content ratio was increased to 55%, there was a noticeable increase in mechanical recovery and permeation reduction properties, indicating good self-healing. Keywords: concrete structures; self-healing; materials technology; blast furnace slag; BFS; mechanical properties; permeation properties; cement; crystalline admixture; Cat-X; construction material; cracks.