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An exploratory study on crack healing in cementitious matrices induced by Pythium aphanidermatum
Nahúm G Cayo Chileno1, Daniela Sales Alviano2, Celuta Sales Alviano2
1Federal University of Rio de Janeiro, Núcleo de Ensino e Pesquisa em Materiais e Tecnologias de Baixo Impacto Ambiental na Construção Sustentável, Cidade Universitária, 21941-972, Rio de Janeiro, RJ, Brazil.
Fungal Biology
|October 13, 2025
Summary
This study explores Pythium aphanidermatum for crack-healing in cement mortars, demonstrating its calcium carbonate (CaCO3) biomineralization potential. The oomycete effectively repairs cracks, even in alkaline conditions, without needing urea.
Area of Science:
- Biomineralization and Geomicrobiology
- Materials Science and Engineering
- Construction Technology
Background:
- Microbial-induced calcium carbonate precipitation (MICP) is crucial for construction applications.
- Existing microbial agents (bacteria, algae, fungi) have limitations.
- Oomycetes represent an unexplored kingdom for biomineralization.
Purpose of the Study:
- Evaluate Pythium aphanidermatum for self-healing cementitious materials.
- Assess CaCO3 biomineralization capacity and crack-healing potential.
- Investigate P. aphanidermatum's performance in alkaline environments.
Main Methods:
- Cultured P. aphanidermatum in controlled liquid media with calcium acetate.
- Assessed ureolytic activity and CaCO3 formation.
- Evaluated microbial growth in alkaline conditions (pH 11).
- Adapted surface application for crack repair in cement mortars.
Main Results:
- P. aphanidermatum can precipitate CaCO3 without urea.
- Optimal conditions: 10^5 cells/mL and 100 mM calcium acetate.
- The oomycete tolerates high pH (11).
- Filamentous growth facilitated partial crack filling in mortars.
Conclusions:
- P. aphanidermatum shows significant potential for crack-healing in concrete.
- This study introduces a novel kingdom (Chromista) for biomineralization research.
- Paves the way for sustainable construction materials and innovative applications.
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