Crack is the most common damage in concrete structures and it could compromise the serviceability and durability of concrete. The environmental concerns and sustainability issues associated with cement and concrete necessitate alternative better cracks maintenance and repair strategies. Self-healing concrete has the ability to heal itself, but only is able to heal small cracks that below 0.2 mm and the improvement of crack self-healing performance becomes hotpot of research. Enzyme-induced carbonate precipitation (EICP) and microbially induced calcium carbonate precipitation (MICP) have been widely explored and applied in the improvement of construction materials. The paper briefly documents the advantages and disadvantages of bacteria/fungi-based self-healing and EICP as well as their current and potential applications. For EICP and fungi-based calcite precipitation to heal, current observations reveal that these two techniques hold beneficial prospects for crack self-healing on cementitious composites. Meanwhile, bacteria-based calcite precipitation has been most investigated in self-healing concrete, and its laboratory studies have advanced understanding of bacterial self-healing concrete. Moreover, bacterial self-healing concrete was also brought into large-scale application but it remains various challenges.
|Original language||American English|
|Title of host publication||Building Materials for Sustainable and Ecological Environment|
|Editors||Varenyam Achal, Chee Seong Chin|
|State||Published - 29 May 2021|