The Use of Alkaliphilic Bacteria-based Repair Solution for Porous Network Concrete Healing Mechanism

Bacteria induced calcium carbonate precipitation based on metabolic conversion of nutrients has been acknowledged for having potentials in self-healing cement-based materials. Recent studies have shown the development of bacteria-based repair solution (liquid) for concrete surface repair. This article demonstrates the feasible application of...

PHA biosynthesis, recovery, and application: A circular value chain for production of self-healing concrete from waste

Polyhydroxyalkanoates (PHA) are a family of biopolymers produced intracellular<br/>by a range of different bacteria.PHA have attracted widespread attention as<br/>an environmental friendly replacement of fossil-based polymers, because they<br/>have thermoplastic and/or elastomeric properties, and are also biobased and<br/>biodegradable.Moreover,...

From waste to self-healing concrete: A proof-of-concept of a new application for polyhydroxyalkanoate

Polyhydroxyalkanoate (PHA) production is a promising opportunity to recover organic carbon from waste streams. However, widespread application of waste-derived PHA as biodegradable plastic is restricted by expensive purification steps, high quality requirements, and a fierce competition with the conventional plastic market. To overcome these...

Self-healing of cementitious materials using sustainable cenosphere-based manufactured aggregate

Self-healing concrete using encapsulated healing agent has shown great potential in enhancing concrete durability. However, the capsules are expensive to make and can lower the mechanical properties of concrete. In this study, a new type of manufactured aggregate that employs waste-derived fly ash cenosphere as a carrier of healing agent (SH...

Self-healing cementitious composites with a hollow vascular network created using 3D-printed sacrificial templates

Additively manufactured vascular networks have great potential for use in autonomous self-healing of cementitious composites as they potentially allow multiple healing events to take place. However, the existence of a vascular tube wall may impede with the healing efficiency if it does not rupture timely to release the healing agent. The...