Review
Construction & Building Technology
Zineb Moujoud, Said Sair, Hanane Ait Ousaleh, Ikrame Ayouch, Abdeslam El Bouari, Omar Tanane
Summary: The construction sector plays a significant role in global environmental issues, making sustainable development in this industry crucial. Geopolymer materials have gained attention as they offer similar technical properties to Portland cementitious materials but with lower CO2 emissions and environmental impact. The use of natural fibers as reinforcement in geopolymer matrix can bring additional benefits. This paper aims to explore the raw materials, manufacturing conditions, and factors affecting the properties of geopolymer materials, as well as the impact of natural fiber-reinforced geopolymer composites.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Weijin Wang, Zhaowen Zhong, Xin Kang, Xiongying Ma
Summary: Graphene oxide (GO) improves the compressive strength, freeze-thaw resistance, and thermal conductivity of geopolymer foam concrete (GFC). The mechanisms of GO reinforcement include providing nucleation sites, forming strong network connections, and filling pore structures. The improved GFC with GO has promising applications.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Ceramics
Shu Yan, Xue Feng, Yaxin Yang, Pengfei Xing
Summary: The study found that metakaolin-based geopolymer foams incorporating diatomite powders exhibit excellent stability and mechanical properties under high-temperature conditions, making them suitable for membrane materials and industrial applications.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Shu Yan, Fanyong Zhang, Xue Feng, Jian Kong, Bo Wang, Jinlong Yang
Summary: A hierarchical porous cenosphere/geopolymer composite foam was fabricated by incorporating hydrogen peroxide and cenosphere filler, resulting in desirable porosity and strength. The composite foams could crystallize in situ to form FHCs/leucite foams at temperatures above 1000 degrees Celsius, showing improved mechanical properties attributed to crack deflection and good bond between FHCs and matrix. This study opens up opportunities for using cellular foams in structure and filtration applications.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Zheming Yang, Faping Li, Weitao Li, Defeng Chen, Shan Li
Summary: This study investigated the mechanical behavior and porosity of slag-based geopolymer composites containing multiwalled carbon nanotubes (MWCNTs). The optimal CNT-dispersant ratio was found to be 2.5:1, and samples with this ratio showed an increase in compressive and flexural strengths by 48% and 55%, respectively, compared to the reference sample. The mechanical properties of the composites reached their maximum values when the water-binder ratio was 0.4.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Marcin Gorski, Pawel Czulkin, Natalia Wielgus, Slawomir Boncel, Anna W. Kuziel, Anna Kolanowska, Rafal G. Jedrysiak
Summary: Geopolymers, an ecological alternative to cement concrete, have gained interest as a potential functional material due to their registrable electrical conductivity. This article discusses the use of a geopolymer material made from metakaolin and waste Cathode Ray Tubes (CRT) glass, reinforced with ultra-long in-house carbon nanotubes (CNT), for Structural Health Monitoring. The addition of carbon nanotubes enhances the electrical conductivity of the geopolymer. The study utilized impedance spectroscopy to investigate the conductive properties of the material and presents promising results.
Article
Nanoscience & Nanotechnology
Liwen Zhang, Xiaolong Ma, Yongyi Zhang, Philip D. Bradford, Yuntian T. Zhu
Summary: Short carbon nanotubes (CNTs) in the film structure tend to tightly bundle together, providing high CNT alignment and enhanced mechanical properties; while long CNTs are prone to bending and tangling, leading to reduced packing density and decreased mechanical performance of the film.
Article
Materials Science, Multidisciplinary
Tomas Kovarik, Jiri Hajek, Michal Pola, David Rieger, Milos Svoboda, Jan Benes, Pavol Sutta, Kalim Deshmukh, Vera Jandova
Summary: This study investigates the fabrication of highly porous ceramic foams using a geopolymer mixture and replica technique, and evaluates the influence of mixture viscosity on foam structure and properties. The optimal viscosity for the geopolymer mixture ranges between 9 and 15 Pa.s, producing ceramic foams with improved performance.
MATERIALS & DESIGN
(2021)
Article
Green & Sustainable Science & Technology
Kirubajiny Pasupathy, Sayanthan Ramakrishnan, Jay Sanjayan
Summary: Increasing the alkali content in the mix enhances the reaction kinetics of brick powder, leading to rapid formation of geopolymer gel and subsequently improving the mechanical properties and setting time of BGFCs. The developed BGFCs show a significant reduction in carbon emissions compared to Ordinary Portland cement foamed concrete.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
Wei Tan, Joe C. Stallard, Changshin Jo, Michael F. L. De Volder, Norman A. Fleck
Summary: The study found that carbon nanotube-polyaniline composite electrodes exhibit excellent capacitance, modulus, and strength, showing potential as ideal candidates for structural energy storage devices. The modulus and strength of the electrode increase with the volume fraction of CNT, while the capacitance increases with the mass of PANI. However, charging or cycling can lead to a decrease in performance in terms of modulus, strength, and capacitance.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Ceramics
Zhihang Wang, Erlei Bai, He Huang, Chaojia Liu, Tengjiao Wang
Summary: Carbon fiber reinforced geopolymer concrete (CFRGC) was prepared using slag and fly ash as cementitious materials, NaOH and sodium silicate as alkaline activators, and carbon fiber as reinforcement, in order to improve its strength and toughness under impact load at different ages. The dynamic mechanical properties of CFRGC were studied by conducting dynamic compression tests using a F 100 mm SHPB test system. The effects of age (3 d, 7 d, 28 d) and fiber content on the mechanical properties of CFRGC were analyzed, and the strengthening and toughening effects of carbon fiber on geopolymer concrete (GC) were evaluated. The results show that CFRGC exhibits strain rate effect at different ages under impact load, with the dynamic compressive strength and specific energy absorption increasing approximately linearly with the strain rate. The carbon fiber content has an influence on the mechanical properties of CFRGC, with an increase initially followed by a decrease in the dynamic compressive strength and specific energy absorption. The strain rate sensitivity of the mechanical properties also follows a similar trend with the increase in carbon fiber content. The optimal fiber content for CFRGC is 0.2%, which exhibits the best dynamic mechanical properties and the highest strain rate sensitivity. Carbon fiber has strengthening and toughening effects on both GC and ordinary Portland cement based concrete (PC), with the most significant effects observed at a fiber content of 0.2%. The strengthening and toughening effects of carbon fiber on GC are superior to those of PC. The effects of carbon fiber on GC are more pronounced at 3 d and 7 d compared to 28 d.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Shu Yan, Xiaoqi Ren, Chenyang He, Wenguang Wang, Man Zhang, Pengfei Xing
Summary: In this study, red mud/slag-based cenospheres/geopolymer foam was fabricated using the direct foaming method at room temperature. The effects of high-temperature exposure on the foam's phase evolution, pore structure, and properties were investigated. The results showed that the foam's porosity and compressive strength can reach desirable levels with the addition of specific agents, indicating potential application in the building insulation field.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Faris Matalkah, Ayman Ababneh, Ruba Aqel
Summary: This paper prepared, characterized, and evaluated a calcined kaolin-based geopolymer foam. Different dosages of hydrogen peroxide foaming agent were added to the geopolymer paste at various percentages. The effect of hydrogen peroxide and different curing temperatures on physical properties, mechanical characteristics, and pore distribution was studied. The results showed that the geopolymer foam had acceptable compressive strength values, low thermal conductivity, and was cost-effective for insulating construction materials.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Huafei Zhou, Zhechen Xu, Ziling Xie, Hengda Hong
Summary: Geopolymer foam has shown great potential as an inorganic porous material, but its low compressive strength remains a challenge. This study addresses this issue by synthesizing a high-strength geopolymer foam and investigating its microstructure, pore properties, thermal conductivity, and compressive behavior. The results demonstrate that the proposed geopolymer foam has comparable thermal conductivity and significantly higher compressive strength, suggesting its suitability for thermal insulation applications.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Polymer Science
Long Ni, Yinfu Luo, Xionghou Peng, Shengtai Zhou, Huawei Zou, Mei Liang
Summary: Polyimide foam has been utilized as structural and thermal insulation materials due to its nearly homogeneous spherical closed pore structure and outstanding thermal stability. The prepared foam shows extremely low thermal conductivity and thermal diffusivity, which makes it ideal for applications in high-tech fields such as aerospace, marine transportation, and microelectronics.
