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Influence of curing temperature and pressure on the mechanical and microstructural development of metakaolin-based geopolymers
https://orcid.org/0000-0003-4054-6414
https://orcid.org/0000-0002-4685-7064
https://orcid.org/0000-0002-0160-7619
Abstract This research investigates the mechanical and microstructural evolution of a metakaolin-based geopolymer (GP) subjected to combined temperature and pressure curing conditions. The study's methodology encompassed measuring compressive strengths through both ultrasonic cement analysis (UCA) and destructive uniaxial testing. To evaluate thermal stability, pore size distribution, and morphology, the study employed thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and environmental scanning electron microscopy (ESEM), respectively. The findings indicate that a curing temperature of 90 °C encourages the development of regular nanoporosity, while higher temperatures contribute to increased porosity. Conversely, curing pressure was found to either promote or inhibit the material's reorganization, with pressures of 20 MPa facilitating and those above 40 MPa preventing this process. An enhancement in the refinement of macropores to micropores was observed across all pressure levels. The optimal curing conditions, in terms of both mechanical and morphological characteristics, were identified as 50 °C and 20 MPa for a minimum duration of one day, which yielded a 177 % improvement in compressive strength compared to curing at 21°C under atmospheric pressure. This study significantly advances the understanding of pressurized thermal curing processes for the rapid setting of geopolymers, presenting new avenues for diverse applications.
Highlights The study evaluates the microstructural development of a MK-based GP under temperature and pressure curing conditions. Curing GP at RT (21°C) results in delayed setting during the initial stages due to issues in achieving gel homogenization. Elevated temperatures, when coupled with pressure, positively affect geopolymerization kinetics. Exceeding 100°C in curing can cause early cracks due to water evaporation.
Influence of curing temperature and pressure on the mechanical and microstructural development of metakaolin-based geopolymers
https://orcid.org/0000-0003-4054-6414
https://orcid.org/0000-0002-4685-7064
https://orcid.org/0000-0002-0160-7619
Abstract This research investigates the mechanical and microstructural evolution of a metakaolin-based geopolymer (GP) subjected to combined temperature and pressure curing conditions. The study's methodology encompassed measuring compressive strengths through both ultrasonic cement analysis (UCA) and destructive uniaxial testing. To evaluate thermal stability, pore size distribution, and morphology, the study employed thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and environmental scanning electron microscopy (ESEM), respectively. The findings indicate that a curing temperature of 90 °C encourages the development of regular nanoporosity, while higher temperatures contribute to increased porosity. Conversely, curing pressure was found to either promote or inhibit the material's reorganization, with pressures of 20 MPa facilitating and those above 40 MPa preventing this process. An enhancement in the refinement of macropores to micropores was observed across all pressure levels. The optimal curing conditions, in terms of both mechanical and morphological characteristics, were identified as 50 °C and 20 MPa for a minimum duration of one day, which yielded a 177 % improvement in compressive strength compared to curing at 21°C under atmospheric pressure. This study significantly advances the understanding of pressurized thermal curing processes for the rapid setting of geopolymers, presenting new avenues for diverse applications.
Highlights The study evaluates the microstructural development of a MK-based GP under temperature and pressure curing conditions. Curing GP at RT (21°C) results in delayed setting during the initial stages due to issues in achieving gel homogenization. Elevated temperatures, when coupled with pressure, positively affect geopolymerization kinetics. Exceeding 100°C in curing can cause early cracks due to water evaporation.
Influence of curing temperature and pressure on the mechanical and microstructural development of metakaolin-based geopolymers
https://orcid.org/0000-0003-4054-6414
https://orcid.org/0000-0002-4685-7064
https://orcid.org/0000-0002-0160-7619
Abstract This research investigates the mechanical and microstructural evolution of a metakaolin-based geopolymer (GP) subjected to combined temperature and pressure curing conditions. The study's methodology encompassed measuring compressive strengths through both ultrasonic cement analysis (UCA) and destructive uniaxial testing. To evaluate thermal stability, pore size distribution, and morphology, the study employed thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), and environmental scanning electron microscopy (ESEM), respectively. The findings indicate that a curing temperature of 90 °C encourages the development of regular nanoporosity, while higher temperatures contribute to increased porosity. Conversely, curing pressure was found to either promote or inhibit the material's reorganization, with pressures of 20 MPa facilitating and those above 40 MPa preventing this process. An enhancement in the refinement of macropores to micropores was observed across all pressure levels. The optimal curing conditions, in terms of both mechanical and morphological characteristics, were identified as 50 °C and 20 MPa for a minimum duration of one day, which yielded a 177 % improvement in compressive strength compared to curing at 21°C under atmospheric pressure. This study significantly advances the understanding of pressurized thermal curing processes for the rapid setting of geopolymers, presenting new avenues for diverse applications.
Highlights The study evaluates the microstructural development of a MK-based GP under temperature and pressure curing conditions. Curing GP at RT (21°C) results in delayed setting during the initial stages due to issues in achieving gel homogenization. Elevated temperatures, when coupled with pressure, positively affect geopolymerization kinetics. Exceeding 100°C in curing can cause early cracks due to water evaporation.
Influence of curing temperature and pressure on the mechanical and microstructural development of metakaolin-based geopolymers
Siciliano, Umberto C.C.S. (author) / Zhao, Jitong (author) / Constâncio Trindade, Ana C. (author) / Liebscher, Marco (author) / Mechtcherine, Viktor (author) / de Andrade Silva, Flávio (author)
2024-03-14
Article (Journal)
Electronic Resource
English
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