Abstract
Bacteria-based self-healing concrete has the ability to heal cracks due to the bacterial conversion of incorporated organic compounds into calcium carbonate. Precipitates seal the cracks, theoretically increasing the service life of constructions. The aim of this paper is to propose a precursor for bacteria-based self-healing concrete derived from organic waste streams, produced is in line with the circular economy principle and ideally more affordable than other substrates. To verify the applicability of the proposed healing agent, some fundamental requirements of the proposed system are studied, such as its influence on functional properties, crack sealing capacity and evidence of bacterial activity in concrete.
Highlights
To improve the durability of construction materials, self-healing concrete gathered high attention from both industry and scientific community during the last decades
For PLA, the progress of heat flow is influenced by the inclusion of the healing agent since the curve shows three defined peaks, which cannot be observed in other samples
These results suggest that specimens cracked at an age of 6 months have more limited amount of un-hydrated cement particles that can stimulate self-healing of concrete, which is in line with previous researches (Luo et al, 2015)
Summary
To improve the durability of construction materials, self-healing concrete gathered high attention from both industry and scientific community during the last decades. Due to the relatively low tensile strength of concrete, cracks are an unavoidable phenomena affecting concrete structures during their service life. Concrete has an intrinsic autogenous ability to heal cracks (de Rooij et al, 2013). Autogenous healing has a healing capacity limited to cracks 0.1–0.2 mm wide (Edvardsen 1999; Li and Yang, 2007; De Belie et al, 2018). Self-healing capacity of concrete can be improved thanks to several methods (De Belie et al, 2018): among others, biogenic concrete has proved to be a promising solution to improve water tightness and potentially the service-life of constructions (Jonkers et al, 2010)
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