Journal ArticleDOI
Quantification of crack-healing in novel bacteria-based self-healing concrete
Virginie Wiktor,Henk M. Jonkers +1 more
TLDR
In this article, a two-component bio-chemical self-healing agent consisting of bacterial spores and calcium lactate is released from the particle by crack ingress water, which results in physical closure of micro cracks.Abstract:
Crack formation is a commonly observed phenomenon in concrete structures. Although micro crack formation hardly affects structural properties of constructions, increased permeability due to micro crack networking may substantially reduce the durability of concrete structures due to risk of ingress of aggressive substances particularly in moist environments. In order to increase the often observed autogenous crack-healing potential of concrete, specific healing agents can be incorporated in the concrete matrix. The aim of this study was to quantify the crack-healing potential of a specific and novel two-component bio-chemical self-healing agent embedded in porous expanded clay particles, which act as reservoir particles and replace part of regular concrete aggregates. Upon crack formation the two-component bio-chemical agent consisting of bacterial spores and calcium lactate are released from the particle by crack ingress water. Subsequent bacterially mediated calcium carbonate formation results in physical closure of micro cracks. Experimental results showed crack-healing of up to 0.46 mm-wide cracks in bacterial concrete but only up to 0.18 mm-wide cracks in control specimens after 100 days submersion in water. That the observed doubling of crack-healing potential was indeed due to metabolic activity of bacteria was supported by oxygen profile measurements which revealed O2 consumption by bacteria-based but not by control specimens. We therefore conclude that this novel bio-chemical self-healing agent shows potential for particularly increasing durability aspects of concrete constructions in wet environments.read more
Citations
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Journal ArticleDOI
Self-healing concrete by use of microencapsulated bacterial spores
TL;DR: In this paper, micro-capsules were applied to encapsulate bacterial spores for self-healing concrete and the results indicated that the healing ratio in the specimens with bio-microcapsules was higher (48%−80%) than in those without bacteria (18%−50%).
Journal ArticleDOI
Self-Healing in Cementitious Materials—A Review
Kim Van Tittelboom,Nele De Belie +1 more
TL;DR: A review of self-healing in concrete can be found in this article, where the types of healing agents and capsules used are evaluated based on the trigger mechanism used and attention has been paid to the properties regained due to selfhealing.
Journal ArticleDOI
Crack healing in concrete using various bio influenced self-healing techniques
TL;DR: In this article, the authors present the process of crack healing phenomenon in concrete by microbial activity of bacteria, Bacillus subtilis, which is introduced in concrete via direct incorporation, and thorough various carrier compounds namely light weight aggregate and graphite nano platelets.
Journal ArticleDOI
A review of self-healing concrete for damage management of structures
Nele De Belie,Elke Gruyaert,Abir Al-Tabbaa,Paola Antonaci,Cornelia Baera,Diana Bajare,Aveline Darquennes,Robert Davies,Liberato Ferrara,Tony Jefferson,Chrysoula Litina,Bojan Miljević,Anna Otlewska,Jonjaua Ranogajec,Marta Roig-Flores,Kevin Paine,Pawel Lukowski,Pedro Serna,Jean Marc Christian Tulliani,Snezana Vucetic,Jianyun Wang,Henk M. Jonkers +21 more
TL;DR: In this paper, the state-of-the-art of self-healing concrete is provided, covering autogenous or intrinsic healing of traditional concrete followed by stimulated autogenous healing via use of mineral additives, crystalline admixtures or (superabsorbent) polymers.
Journal ArticleDOI
Engineered applications of ureolytic biomineralization: a review.
Adrienne J. Phillips,Robin Gerlach,Ellen G. Lauchnor,Andrew C. Mitchell,Alfred B. Cunningham,Lee H. Spangler +5 more
TL;DR: This review discusses how optimization of MICP is attempted for different engineering applications in an effort to highlight the key research and development questions necessary to move MICP technologies toward commercial scale applications.
References
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Book
Properties of concrete
TL;DR: In this article, the authors present the following properties of concrete: Elasticity, Shrinkage and Creep, Durabilty of Concrete, Freezing and Thawing, and Chlorides.
Journal ArticleDOI
Microbial carbonate precipitation in construction materials: A review
TL;DR: In this paper, the use of microbially induced carbonates as a binder material, i.e., biocementation, is discussed, for the improvement of compressive strength and the remediation of cracks.
Journal ArticleDOI
Application of bacteria as self-healing agent for the development of sustainable concrete
TL;DR: In this article, a specific group of alkali-resistant spore-forming bacteria related to the genus Bacillus was selected for this purpose, and the bacterial spores directly added to the cement mixture remained viable for a period up to 4 months.
Journal ArticleDOI
Water Permeability and Autogenous Healing of Cracks in Concrete
TL;DR: In this paper, the authors investigated the effect of self-healing in cracks on the functional reliability of structures subjected to water-pressure loads and showed that the formation of calcite in the crack is almost the sole cause for the autogenous healing.