The Effects of Calcite-Producing Bacteria on the Engineering Properties of Alkali-Activated Composite Mortars
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Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer Science and Business Media Deutschland GmbH
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study aims to explore the impact of calcium carbonate-producing bacteria on the engineering properties of alkali-activated composite mortars (AACMs). This study conducted an investigation on the mechanical properties, water absorption, rapid chloride ion permeability, ultrasonic pulse velocity, and mercury porosimetry of AACMs with varying cell concentrations of microbial Bacillus subtilis (BS) per milliliter (103, 105, and 107 cells/ml). Regarding the beneficial effects of improvement agents on concrete behavior, the effect of microbial-induced carbonate precipitation (MICP) in AACMs, which is an environmentally friendly solution for engineering properties, was investigated. AACMs with three different cell concentrations of Bacillus subtilis (103, 105, and 107 cells/ml) were investigated. Among these, the sample featuring 105 cells/ml exhibited the most favorable flexural and compressive strength. 7 and 28 days flexural strengths of 105 cells/ml added AACMs samples were 8.16 and 23.80%, while their compressive strengths were 17.70 and 22.65%, respectively. A decrease of approximately 12.27% was observed in water absorption in 28-day AACMs samples, and a decrease of 24.70% was observed in rapid chloride ion permeability. It was seen in the study that BS bacteria species caused a noticeable improvement in the performance of AACMs. © The Author(s), under exclusive licence to Shiraz University 2024.
Açıklama
Anahtar Kelimeler
Alkali-activated materials; Calcite producing bacteria (Bacillus subtilis); Calcium carbonate; Mechanical properties
Kaynak
Iranian Journal of Science and Technology - Transactions of Civil Engineering
WoS Q Değeri
Scopus Q Değeri
Q2
