The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica
This study aimed to investigate the effects of a partial replacement (25 wt%) of Portland cement with sugarcane bagasse ash (SCBA) on the microstructure of cement pastes. The effects were compared with those of pastes containing amorphous (silica fume) or crystalline (crushed quartz) silica. Two cur...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424021574 |
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| author | Ander de Jesus Torres Mateus Bravo de Aguiar White José dos Santos Kejin Wang Dayana Cristina Silva Garcia |
| author_facet | Ander de Jesus Torres Mateus Bravo de Aguiar White José dos Santos Kejin Wang Dayana Cristina Silva Garcia |
| author_sort | Ander de Jesus Torres |
| collection | DOAJ |
| description | This study aimed to investigate the effects of a partial replacement (25 wt%) of Portland cement with sugarcane bagasse ash (SCBA) on the microstructure of cement pastes. The effects were compared with those of pastes containing amorphous (silica fume) or crystalline (crushed quartz) silica. Two curing methods were used for the pastes: conventional curing (25 °C and RH > 95%) and autoclave curing (220 °C under 2.1 MPa for 8 h). The microstructure of the pastes was characterized by XRD, SEM, FTIR, and the hardness and elastic modulus of their C–S–H regions. The results showed that the pastes cured at room temperature exhibited similar microstructure development, showing little or no reaction, even though silica fume is a highly reactive pozzolanic material. Differently, the hardness of the pastes containing silica fume, SBCA and crushed quartz replacement for cement increased approximately threefold after autoclave curing, while, in contrast, the reference sample, no cement replacement, showed no improvement. This is attributed to the formation of tobermorite and xonotlite. The presence of Al in the SCBA allowed the formation of tobermorite under the autoclave curing conditions (220 °C, 2.1 MPa for 8 h), and in this case, the SCBA exhibited behavior between silica fume and fine quartz. |
| format | Article |
| id | doaj-art-866c7b2d607c454abf4ae2f4b2d667e0 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-866c7b2d607c454abf4ae2f4b2d667e02025-08-20T01:57:20ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01331309132110.1016/j.jmrt.2024.09.152The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silicaAnder de Jesus Torres0Mateus Bravo de Aguiar1White José dos Santos2Kejin Wang3Dayana Cristina Silva Garcia4Department of Materials Engineering and Construction, Universidade Federal de Minas Gerais, Av. Antonio Carlos 6627, Belo Horizonte, 31270-901, BrazilDepartment of Materials Engineering and Construction, Universidade Federal de Minas Gerais, Av. Antonio Carlos 6627, Belo Horizonte, 31270-901, BrazilDepartment of Materials Engineering and Construction, Universidade Federal de Minas Gerais, Av. Antonio Carlos 6627, Belo Horizonte, 31270-901, BrazilDepartment of Civil, Construction and Environmental Engineering, Iowa State University, IA, 50014, USADepartment of Materials Engineering and Construction, Universidade Federal de Minas Gerais, Av. Antonio Carlos 6627, Belo Horizonte, 31270-901, Brazil; Corresponding author.This study aimed to investigate the effects of a partial replacement (25 wt%) of Portland cement with sugarcane bagasse ash (SCBA) on the microstructure of cement pastes. The effects were compared with those of pastes containing amorphous (silica fume) or crystalline (crushed quartz) silica. Two curing methods were used for the pastes: conventional curing (25 °C and RH > 95%) and autoclave curing (220 °C under 2.1 MPa for 8 h). The microstructure of the pastes was characterized by XRD, SEM, FTIR, and the hardness and elastic modulus of their C–S–H regions. The results showed that the pastes cured at room temperature exhibited similar microstructure development, showing little or no reaction, even though silica fume is a highly reactive pozzolanic material. Differently, the hardness of the pastes containing silica fume, SBCA and crushed quartz replacement for cement increased approximately threefold after autoclave curing, while, in contrast, the reference sample, no cement replacement, showed no improvement. This is attributed to the formation of tobermorite and xonotlite. The presence of Al in the SCBA allowed the formation of tobermorite under the autoclave curing conditions (220 °C, 2.1 MPa for 8 h), and in this case, the SCBA exhibited behavior between silica fume and fine quartz.http://www.sciencedirect.com/science/article/pii/S2238785424021574Agro-industrial wasteSupplementary cementitious materialsMicrostructureHydrothermal curingSustainable cements |
| spellingShingle | Ander de Jesus Torres Mateus Bravo de Aguiar White José dos Santos Kejin Wang Dayana Cristina Silva Garcia The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica Journal of Materials Research and Technology Agro-industrial waste Supplementary cementitious materials Microstructure Hydrothermal curing Sustainable cements |
| title | The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica |
| title_full | The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica |
| title_fullStr | The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica |
| title_full_unstemmed | The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica |
| title_short | The influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material: Comparative study with amorphous and crystalline silica |
| title_sort | influence of sugarcane bagasse ash on the microstructure of autoclaved cementitious material comparative study with amorphous and crystalline silica |
| topic | Agro-industrial waste Supplementary cementitious materials Microstructure Hydrothermal curing Sustainable cements |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021574 |
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