Print Email Facebook Twitter Development of autonomous-healing mortar using Geobacillus stearothermophilus Title Development of autonomous-healing mortar using Geobacillus stearothermophilus Author Aimi, M. A.Raden Maizatul (Civil and Structural Engineering Branch of the Public Works Department (JKR)) Hamidah, M. S. (Universiti Teknologi MARA) Kartini, K. (Universiti Teknologi MARA) Hana, H. Noor (Universiti Teknologi MARA) Khalilah, A. K. (Universiti Teknologi MARA) Schlangen, E. (TU Delft Materials and Environment) Date 2021 Abstract Autonomous healing by the microbially induced calcite precipitation (MICP) mechanism has garnered significant interest in the sustainable approach to concrete repair and maintenance. Previous research works have reported that Bacillus pasteurii and Bacillus sphaericus are the most commonly used in concrete associated with bacteria. However, there is limited information on other types of bacteria species. In this study, the vegetative cells of Geobacillus stearothermophilus were introduced and encapsulated into alginate-hydrogel before incorporation into the mortar. The urease activity, viability, swelling, and water retention properties of the bacterial Geobacillus stearothermophilus cell encapsulated in alginate-hydrogel were measured. The performance of alginate-encapsulated Geobacillus stearothermophilus (AE-GS) in the mortar mixture as a self-healing agent was measured by compressive strength, water absorption, and crack-healing efficiency. The precipitation of calcium carbonate of the AE-GS mortar was measured using thermogravimetric analysis (TGA). The highest level of crack healing was 63% (by the initial crack width) which was achieved by incorporating 15% AE-GS (replacement by total weight of the mortar). However, the lower result of compressive strength and the highest absorption rate were portrayed by the mortar specimens that contained 15% of AE-GS replacement compared with the control mortar (AE-R) and with those of AE-GS replacement level at 3 and 9%. Subject Alginate-hydrogel beadsAutonomous healingBacteriaCrack remediationMicrobial CaCO To reference this document use: http://resolver.tudelft.nl/uuid:7a65b4f0-d804-43fd-99e9-592746a9c78a DOI https://doi.org/10.14359/51700895 Embargo date 2021-07-01 ISSN 0889-325X Source ACI Materials Journal, 118 (1), 3-11 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2021 M. A.Raden Maizatul Aimi, M. S. Hamidah, K. Kartini, H. Noor Hana, A. K. Khalilah, E. Schlangen Files PDF MJ_Jan._2021_V._118_No._1 ... langen.pdf 1.16 MB Close viewer /islandora/object/uuid:7a65b4f0-d804-43fd-99e9-592746a9c78a/datastream/OBJ/view