Investigation of leakage and self-healing of direct tension cracks under sustained loading and high-water pressure

A review of the efficiency of self-healing concrete technologies for durable and sustainable concrete under realistic conditions

“…What is of major importance though is the stability of the cracks and the structural integrity, especially in deep water installations. High-performance fibre-reinforced cementitious composites (HPFRCCs) can be the ideal candidates in these scenarios, mainly because of their ability to spread otherwise localized damage into narrow and tightly spaced multiple cracks [155].…”

“…ECC has shown high potential to withstand extreme conditions, mainly because it contains fibres, contributing to the reduction in the crack widths. Hooshmand et al [155] verified the efficiency of ECC, pre-cracked in direct tension up to two different crack levels and healing under 0.048 MPa water pressure, in short-term (up to 30 h – Figure 10(a)) and in long-term (up to 10 days – Figure 10(b)). The authors showed the potential of the investigated high-performance cementitious composites to heal better under water pressure, as compared to conventional concrete, rightly due to the capacity to spread the localized damage into multiple cracks.…”

“…The authors showed the potential of the investigated high-performance cementitious composites to heal better under water pressure, as compared to conventional concrete, rightly due to the capacity to spread the localized damage into multiple cracks. Closure by autogenous self-healing in less than a week was observed for the 50 µm wide cracks (‘South’ in Figure 10(b)), whereas, for the crack with a width of 100 µm (‘North’ in Figure 10(b)), ten days were needed to quash the leakage [155]. SEM-EDX analyses showed that the cracks of ECC were filled with higher quantities of dense self-healing products (CaCO 3 and C-S-H / CH) compared to conventional concrete.

Figure 10. Outcomes of leakage rate versus time in ECC under water pressure: (a) short-term self-healing in hours, (b) long-term self-healing in days.

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“…SEM-EDX analyses showed that the cracks of ECC were filled with higher quantities of dense self-healing products (CaCO 3 and C-S-H / CH) compared to conventional concrete.

Figure 10. Outcomes of leakage rate versus time in ECC under water pressure: (a) short-term self-healing in hours, (b) long-term self-healing in days. North represents cracks with a width of 100 µm, while South represents 50 µm wide cracks [155]. Copyright 2021, Elsevier.

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“…Outcomes of leakage rate versus time in ECC under water pressure: (a) short-term self-healing in hours, (b) long-term self-healing in days. North represents cracks with a width of 100 µm, while South represents 50 µm wide cracks [155]. Copyright 2021, Elsevier.…”