A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sporosarcina pasteurii-induced hydration and shrinkage properties of Portland cement
Highlights Sporosarcina pasteurii-induced hydration and shrinkage phenomenon were investigated. Incorporated bacteria tended to retard the progress of early hydration of cement. CO3 2− ions released from bacterial activity consumed surrounding Ca2+ and promoted the hydration of belite. Incorporated bacteria delayed the phenomenon of autogenous shrinkage.
Abstract The present study explored the Sporosarcina pasteurii-induced hydration and shrinkage properties of Portland cement. Bacterial culture solutions were incorporated into cement samples at varying dosages. The hydration properties of the fabricated samples were investigated through compressive strength tests, X-ray diffractograms, thermogravimetric analyses, and water absorption tests. In addition, autogenous and drying shrinkage measurements were carried out to monitor the volumetric changes of the samples with different bacteria contents. The test outcomes identified that the incorporation of bacteria retarded the progress of early hydration while promoting the reaction at a later stage by internal carbonation accompanied by the CO3 2− released by the bacteria. The internal carbonation was particularly effective in enhancing the reaction degree of belite, which produced more CSH. The microstructural modification of the samples by CaCO3 precipitation reduced the water absorption level and mitigated the development of drying shrinkage.
Sporosarcina pasteurii-induced hydration and shrinkage properties of Portland cement
Highlights Sporosarcina pasteurii-induced hydration and shrinkage phenomenon were investigated. Incorporated bacteria tended to retard the progress of early hydration of cement. CO3 2− ions released from bacterial activity consumed surrounding Ca2+ and promoted the hydration of belite. Incorporated bacteria delayed the phenomenon of autogenous shrinkage.
Abstract The present study explored the Sporosarcina pasteurii-induced hydration and shrinkage properties of Portland cement. Bacterial culture solutions were incorporated into cement samples at varying dosages. The hydration properties of the fabricated samples were investigated through compressive strength tests, X-ray diffractograms, thermogravimetric analyses, and water absorption tests. In addition, autogenous and drying shrinkage measurements were carried out to monitor the volumetric changes of the samples with different bacteria contents. The test outcomes identified that the incorporation of bacteria retarded the progress of early hydration while promoting the reaction at a later stage by internal carbonation accompanied by the CO3 2− released by the bacteria. The internal carbonation was particularly effective in enhancing the reaction degree of belite, which produced more CSH. The microstructural modification of the samples by CaCO3 precipitation reduced the water absorption level and mitigated the development of drying shrinkage.
Sporosarcina pasteurii-induced hydration and shrinkage properties of Portland cement
Seo, Joonho (author) / Kim, Hayeon (author) / Kim, Seonhyeok (author) / Park, Solmoi (author) / Bae, Jin-Ho (author) / Kim, Naru (author) / Jang, Daeik (author) / Lee, H.K. (author)
2022-09-14
Article (Journal)
Electronic Resource
English
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