Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microbial Induced Calcium Carbonate Precipitation (MICP) Treatments for the Reduction of Water Absorption of Recycled Mixed Aggregates
https://orcid.org/http://orcid.org/0000-0001-9805-9585
https://orcid.org/http://orcid.org/0000-0002-8582-3799
A novel treatment method for the improvement of recycled aggregates is MICP (microbial induced calcium carbonate precipitation), which is already used successfully in soil improvement. Recycled mixed aggregates (RMA), in particular, have limited use as they influence the performance of the concrete. The precipitation can be used as a surface treatment for the reduction of the porosity and water absorption of recycled aggregates. This study aims to compare three different MICP treatment methods to investigate their potential for the reduction of water absorption properties of RMA. MICP treatments such as spraying, immersion and an alternative MICP treatment using a Büchner funnel were tested and compared. The results show that all methods used were able to reduce the water absorption of the RMA. It was also found that multiple MICP treatments enhance this effect. In the process, the water absorption of the RMA could be reduced up to 42.8% (from 21% to 12%) after the third MICP treatment when using the immersion method with 24 h intervals. It was found, that due to the MICP treatments, the RMA requires less pre-wetting water for mortar production than untreated RMA. Also, layers of microbial precipitated CaCO3 could be detected on the surface of RMA grains.
Microbial Induced Calcium Carbonate Precipitation (MICP) Treatments for the Reduction of Water Absorption of Recycled Mixed Aggregates
https://orcid.org/http://orcid.org/0000-0001-9805-9585
https://orcid.org/http://orcid.org/0000-0002-8582-3799
A novel treatment method for the improvement of recycled aggregates is MICP (microbial induced calcium carbonate precipitation), which is already used successfully in soil improvement. Recycled mixed aggregates (RMA), in particular, have limited use as they influence the performance of the concrete. The precipitation can be used as a surface treatment for the reduction of the porosity and water absorption of recycled aggregates. This study aims to compare three different MICP treatment methods to investigate their potential for the reduction of water absorption properties of RMA. MICP treatments such as spraying, immersion and an alternative MICP treatment using a Büchner funnel were tested and compared. The results show that all methods used were able to reduce the water absorption of the RMA. It was also found that multiple MICP treatments enhance this effect. In the process, the water absorption of the RMA could be reduced up to 42.8% (from 21% to 12%) after the third MICP treatment when using the immersion method with 24 h intervals. It was found, that due to the MICP treatments, the RMA requires less pre-wetting water for mortar production than untreated RMA. Also, layers of microbial precipitated CaCO3 could be detected on the surface of RMA grains.
Microbial Induced Calcium Carbonate Precipitation (MICP) Treatments for the Reduction of Water Absorption of Recycled Mixed Aggregates
https://orcid.org/http://orcid.org/0000-0001-9805-9585
https://orcid.org/http://orcid.org/0000-0002-8582-3799
A novel treatment method for the improvement of recycled aggregates is MICP (microbial induced calcium carbonate precipitation), which is already used successfully in soil improvement. Recycled mixed aggregates (RMA), in particular, have limited use as they influence the performance of the concrete. The precipitation can be used as a surface treatment for the reduction of the porosity and water absorption of recycled aggregates. This study aims to compare three different MICP treatment methods to investigate their potential for the reduction of water absorption properties of RMA. MICP treatments such as spraying, immersion and an alternative MICP treatment using a Büchner funnel were tested and compared. The results show that all methods used were able to reduce the water absorption of the RMA. It was also found that multiple MICP treatments enhance this effect. In the process, the water absorption of the RMA could be reduced up to 42.8% (from 21% to 12%) after the third MICP treatment when using the immersion method with 24 h intervals. It was found, that due to the MICP treatments, the RMA requires less pre-wetting water for mortar production than untreated RMA. Also, layers of microbial precipitated CaCO3 could be detected on the surface of RMA grains.
Microbial Induced Calcium Carbonate Precipitation (MICP) Treatments for the Reduction of Water Absorption of Recycled Mixed Aggregates
RILEM Bookseries
Jędrzejewska, Agnieszka (Herausgeber:in) / Kanavaris, Fragkoulis (Herausgeber:in) / Azenha, Miguel (Herausgeber:in) / Benboudjema, Farid (Herausgeber:in) / Schlicke, Dirk (Herausgeber:in) / Nagy, Brigitte (Autor:in) / Zentner, Johanna (Autor:in) / Kustermann, Andrea (Autor:in)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
11.06.2023
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Review of ground improvement using microbial induced carbonate precipitation (MICP)
| Online Contents | 2017
Review of ground improvement using microbial induced carbonate precipitation (MICP)
| Taylor & Francis Verlag | 2017
Review of Ground Improvement Using Microbial Induced Carbonate Precipitation (MICP)
| Online Contents | 2017
| Taylor & Francis Verlag | 2023