Projects per year
Abstract
Costs associated with the encapsulation process of bacterial spores continue to be a limiting factor for the commercialisation of self-healing cementitious materials. The feasibility of using air-entraining admixtures (AEAs) as an economical and straightforward encapsulation method for bacterial spores was evaluated to heal cracks (∼0.50 mm) that were formed at an early (28 days) or later age (9 months). Three AEAs, commonly used in concrete industry, were compared to a successfully proven protection method (i.e., via aerated concrete granules (ACGs)). In this regard, only one of the three AEAs investigated improved the healing performance when compared to an equivalent mix using bacterial spores encapsulated in ACGs. Healing ratios obtained with this successful AEA were 59.6% and 46.2% higher than the results observed for the ACGs-containing mix when the cracking age was 28 days and 9 months, respectively. Moreover, water penetration resistance was increased by 18.1% or presented very similar values (∼84%) after 56 days of healing for early or later-formed cracks, respectively. Moreover, a simple cost analysis was conducted to confirm the significant economic benefits of using AEAs to protect directly added bacterial spores. In this regard, the cost of using AEAs is about 13 times lower than for ACGs. Therefore, this study provides for the first time, evidence of the feasibility of using AEAs to protect bacterial spores, opening the doors to the development of bespoke AEAs to design cost-efficient self-healing cementitious materials.
Original language | English |
---|---|
Article number | 126877 |
Journal | Construction and Building Materials |
Volume | 327 |
Early online date | 24 Feb 2022 |
DOIs | |
Publication status | Published - 11 Apr 2022 |
Bibliographical note
Funding Information:This work was supported by the EPSRC through the Resilient Materials for Life (RM4L) (EP/P02081X/1) and the Engineering Microbial-Induced Carbonate Precipitation via Meso-Scale Simulations (eMICP) (EP/S013997/1) projects. The authors gratefully acknowledge the technical staff in the Department of Architecture and Civil Engineering, the Department of Biology and Biochemistry and the Material and Chemical Characterisation Facility (MC2) at the University of Bath (https://doi.org/10.15125/mx6j-3r54) for their key support. The authors further thank Paul J. Griffin (Cemex Admixtures UK) and Ian Ellis (BASF Construction Chemicals (UK) Ltd.) for providing the AEAs.
Funding Information:
This work was supported by the EPSRC through the Resilient Materials for Life (RM4L) (EP/P02081X/1) and the Engineering Microbial-Induced Carbonate Precipitation via Meso-Scale Simulations (eMICP) (EP/S013997/1) projects. The authors gratefully acknowledge the technical staff in the Department of Architecture and Civil Engineering, the Department of Biology and Biochemistry and the Material and Chemical Characterisation Facility (MC 2 ) at the University of Bath (https://doi.org/10.15125/mx6j-3r54) for their key support. The authors further thank Paul J. Griffin (Cemex Admixtures UK) and Ian Ellis (BASF Construction Chemicals (UK) Ltd.) for providing the AEAs.
Keywords
- Air-entraining admixtures
- Bacteria
- Encapsulation
- Later-formed cracks
- MICP
- Self-healing
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- General Materials Science
Fingerprint
Dive into the research topics of 'Air-entraining admixtures as a protection method for bacterial spores in self-healing cementitious composites: Healing evaluation of early and later-age cracks'. Together they form a unique fingerprint.Projects
- 2 Finished
-
A New Paradigm for Engineering Microbial Induced Carbonate Precipitation via Meso-Scale Simulations
Gebhard, S. (PI) & Paine, K. (CoI)
Engineering and Physical Sciences Research Council
1/09/19 → 31/12/22
Project: Research council
-
RM4L - Resilient Materials for Life
Paine, K. (PI), Ball, R. (CoI), Gebhard, S. (CoI), Heath, A. (CoI), Tan, L. (Researcher) & Tzoura, E. (Researcher)
Engineering and Physical Sciences Research Council
3/04/17 → 2/10/22
Project: Research council
Datasets
-
Dataset for "Air-entraining admixtures as a protection method for bacterial spores in self-healing cementitious composites: Healing evaluation of early and later-age cracks"
Justo Reinoso, I. (Creator), Reeksting, B. (Creator), Hamley-Bennett, C. (Creator), Heath, A. (Creator), Gebhard, S. (Creator) & Paine, K. (Creator), University of Bath, 24 Feb 2022
DOI: 10.15125/BATH-01087
Dataset
Equipment
-
Large chamber variable pressure scanning electron microscope (SEM)
Material and Chemical Characterisation (MC2)Facility/equipment: Equipment
-
Raman confocal microscope RENISHAM INVIA
Material and Chemical Characterisation (MC2)Facility/equipment: Equipment