Comparison of different types of self-healing concrete under extreme conditions

Extreme environments are aggressive for concrete structures, hence a performance-based design is crucial to guarantee the durability during service life. Nonetheless, there knowledge gap regarding influence of cracks on standard and self-healing concrete. This research focuses monitoring cracked with two commercial healing agents: bacteria-based agent (BAS) crystalline admixture (CA). After crack formation process three months in wet/dry conditions (4 days/3 days), several extreme were considered: (1) submerged artificial seawater, (2) solution 33 g/L sodium chloride (3) freeze-thaw (FT) cycling de-icing salts. Microscopic images used quantify efficiency different agents, while ingress scaling measured determine durability. The results microscopic measurements indicated significant both agents after regime reaching 72% CA, 67% BAS. exposure marine environment, this increased 95% 92%, respectively. uncracked BAS samples achieved reduction 93% under FT relative REF samples, was 49% CA samples. In reduced by 50% 24% all tested conditions, partially prevented through crack, showed great reduction. Overall, degradation could decrease ingress.