A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Synergistic effects of microencapsulated bacterial spores and superabsorbent polymer on self-healing performance in mortar
https://orcid.org/0000-0002-5407-5433
https://orcid.org/0000-0002-1680-4578
https://orcid.org/0000-0002-5661-1885
https://orcid.org/0000-0003-4457-6784
https://orcid.org/0000-0001-8289-3647
Abstract This study explores the feasibility of utilizing a superabsorbent polymer (SAP) to improve the self-healing performance of microbial-induced calcium carbonate precipitation (MICP) in cement-based materials. The amount of microencapsulated bacterial spores was varied from 0.25–1 % by cement weight. The SAP content was set to either 0 or 4 % by cement weight. As additives, the impact of SAP and MICP bacteria on mortar properties, including flowability and compressive strength, was assessed. The self-healing performance was evaluated based on crack-healing percentage and water permeability recovery. Microstructural analyses, including thermogravimetry/differential thermal analysis (TG/DTA), X-ray diffraction (XRD), and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), were performed to investigate the microstructural and chemical changes during the healing process. The findings revealed that specimens exclusively mixed with 4 % SAP exhibited a slightly lower crack-closure efficiency compared to those mixed exclusively with 1 % MICP bacteria. However, the SAP-containing specimens exhibited a higher degree of permeability recovery. Meanwhile, in the binary additive system with 0.5 % MICP bacteria and 4 % SAP, the specimens exhibited the highest crack-closure percentage of 91 % and a final water discharge rate of 15 mL/min after 45 days of healing. In contrast, specimens mixed exclusively with 1 % MICP bacteria showed a crack-closure percentage of 76 % and a final water discharge rate of 59 mL/min. These results suggest that incorporating SAP into the MICP system enables a reduction in MICP bacterial content without compromising self-healing performance.
Highlights Effect of SAP and MICP bacteria on self-healing performance and properties of mortar is studied. The 1 % MICP bacteria mortar showed a higher crack-closure ratio than 4 % SAP mortar. Mortar with 0.5 % MICP bacteria and 4 % SAP achieved the highest crack-closure. Incorporating SAP in MICP reduces bacterial content without compromising self-healing.
Synergistic effects of microencapsulated bacterial spores and superabsorbent polymer on self-healing performance in mortar
https://orcid.org/0000-0002-5407-5433
https://orcid.org/0000-0002-1680-4578
https://orcid.org/0000-0002-5661-1885
https://orcid.org/0000-0003-4457-6784
https://orcid.org/0000-0001-8289-3647
Abstract This study explores the feasibility of utilizing a superabsorbent polymer (SAP) to improve the self-healing performance of microbial-induced calcium carbonate precipitation (MICP) in cement-based materials. The amount of microencapsulated bacterial spores was varied from 0.25–1 % by cement weight. The SAP content was set to either 0 or 4 % by cement weight. As additives, the impact of SAP and MICP bacteria on mortar properties, including flowability and compressive strength, was assessed. The self-healing performance was evaluated based on crack-healing percentage and water permeability recovery. Microstructural analyses, including thermogravimetry/differential thermal analysis (TG/DTA), X-ray diffraction (XRD), and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), were performed to investigate the microstructural and chemical changes during the healing process. The findings revealed that specimens exclusively mixed with 4 % SAP exhibited a slightly lower crack-closure efficiency compared to those mixed exclusively with 1 % MICP bacteria. However, the SAP-containing specimens exhibited a higher degree of permeability recovery. Meanwhile, in the binary additive system with 0.5 % MICP bacteria and 4 % SAP, the specimens exhibited the highest crack-closure percentage of 91 % and a final water discharge rate of 15 mL/min after 45 days of healing. In contrast, specimens mixed exclusively with 1 % MICP bacteria showed a crack-closure percentage of 76 % and a final water discharge rate of 59 mL/min. These results suggest that incorporating SAP into the MICP system enables a reduction in MICP bacterial content without compromising self-healing performance.
Highlights Effect of SAP and MICP bacteria on self-healing performance and properties of mortar is studied. The 1 % MICP bacteria mortar showed a higher crack-closure ratio than 4 % SAP mortar. Mortar with 0.5 % MICP bacteria and 4 % SAP achieved the highest crack-closure. Incorporating SAP in MICP reduces bacterial content without compromising self-healing.
Synergistic effects of microencapsulated bacterial spores and superabsorbent polymer on self-healing performance in mortar
https://orcid.org/0000-0002-5407-5433
https://orcid.org/0000-0002-1680-4578
https://orcid.org/0000-0002-5661-1885
https://orcid.org/0000-0003-4457-6784
https://orcid.org/0000-0001-8289-3647
Abstract This study explores the feasibility of utilizing a superabsorbent polymer (SAP) to improve the self-healing performance of microbial-induced calcium carbonate precipitation (MICP) in cement-based materials. The amount of microencapsulated bacterial spores was varied from 0.25–1 % by cement weight. The SAP content was set to either 0 or 4 % by cement weight. As additives, the impact of SAP and MICP bacteria on mortar properties, including flowability and compressive strength, was assessed. The self-healing performance was evaluated based on crack-healing percentage and water permeability recovery. Microstructural analyses, including thermogravimetry/differential thermal analysis (TG/DTA), X-ray diffraction (XRD), and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), were performed to investigate the microstructural and chemical changes during the healing process. The findings revealed that specimens exclusively mixed with 4 % SAP exhibited a slightly lower crack-closure efficiency compared to those mixed exclusively with 1 % MICP bacteria. However, the SAP-containing specimens exhibited a higher degree of permeability recovery. Meanwhile, in the binary additive system with 0.5 % MICP bacteria and 4 % SAP, the specimens exhibited the highest crack-closure percentage of 91 % and a final water discharge rate of 15 mL/min after 45 days of healing. In contrast, specimens mixed exclusively with 1 % MICP bacteria showed a crack-closure percentage of 76 % and a final water discharge rate of 59 mL/min. These results suggest that incorporating SAP into the MICP system enables a reduction in MICP bacterial content without compromising self-healing performance.
Highlights Effect of SAP and MICP bacteria on self-healing performance and properties of mortar is studied. The 1 % MICP bacteria mortar showed a higher crack-closure ratio than 4 % SAP mortar. Mortar with 0.5 % MICP bacteria and 4 % SAP achieved the highest crack-closure. Incorporating SAP in MICP reduces bacterial content without compromising self-healing.
Synergistic effects of microencapsulated bacterial spores and superabsorbent polymer on self-healing performance in mortar
Chindasiriphan, Pattharaphon (author) / Subwilai, Nattachai (author) / Intarasoontron, Jirapa (author) / Nuaklong, Peem (author) / Jongvivatsakul, Pitcha (author) / Chompoorat, Thanakorn (author) / Pungrasmi, Wiboonluk (author) / Likitlersuang, Suched (author)
2024-01-10
Article (Journal)
Electronic Resource
English
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