Effect of Carbon Fibers on Thermal and Mechanical Properties of Metakaolin-Fly Ash-Based Geopolymers

Zhang, Hai Yan; Kodur, Venkatesh; Wu, Bo; Cao, Liang; Qi, Shu Liang

doi:10.14359/51687391

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Zhang et al showed that the addition of additives of short carbon fibers, basalt fibers and styrene-acrylate in metakaolin (MK)/fly ash based geopolymer concrete influenced the bond strength at ambient curing temperatures (or) at elevated temperatures. At ambient conditions, the addition of short carbon fibers did not influence the strength, but improved the bond strength achieved at 100-300°C range [11] . Bashar et al utilized palm oil fuel ash (POFA), fly ash (FA) and blast furnace slag (BFS) as binders along with manufactured sand (M-sand) and quarry dust with the replacement of conventional mining sand (N-sand) on the compressive strength of geopolymer mortar.…”

Section: Introductionmentioning

confidence: 87%

Parametric studies on the workability and compressive strength properties of geopolymer concrete

Nagajothi

Elavenil

2018

Journal of the Mechanical Behavior of Materials

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Geopolymer concrete is a booming technology in the construction industry. Much research is occurring in geopolymer concrete, as it emits low carbon dioxide into the atmosphere, is eco-friendly material and is an alternative for cement. This research mainly focuses on the use of fly ash based geopolymer concrete in ambient curing conditions and the use of manufactured sand due to the scarcity of natural sand. Mainly studies have evolved on the workability, setting time and compressive strength by the effect of ground granulated blast furnace slag (GGBFS), manufactured sand (M-sand), alkaline activator solutions to binder ratio and the proportions of sodium silicate to sodium hydroxide (SS/SH) in geopolymer concrete and mortar. The experimental studies were carried out using nine geopolymer concrete mixes and the comparisons were made. The workability of concrete decreases by increasing the percentage of GGBFS, M-sand and the proportions of SS/SH whereas workability of concrete increases when increasing the alkaline liquid to binder ratio. The compressive strength of geopolymer mortar and concrete increases when the percentage of GGBFS and M-sand is increased, and it decreases by increasing the alkaline liquid content. There is no change in strength by decreasing the proportions of SS/SH.

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Section: Introductionmentioning

confidence: 87%

Parametric studies on the workability and compressive strength properties of geopolymer concrete

Nagajothi

Elavenil

2018

Journal of the Mechanical Behavior of Materials

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“…Chamotte aggregates are added to FA and MK geopolymers, and the effect of inhibiting thermal shrinkage is very significant compared with geopolymer slurry [53]. In view of the advantage of short fibers in reinforcing ordinary concrete, it was also used to improve the thermal stability of geopolymer [54]. e results show that carbon fiber reduces the thermal shrinkage of geopolymers from approximately 4% at 500°C to less than 0.1%, due to the deformation restraint imposed by carbon fibers.…”

Section: Ermal Expansion/shrinkage Process Of Geopolymersmentioning

confidence: 99%

“…Finally, the test conditions such as heating time and heating temperature are also considered to be an important factor related to the properties of the geopolymers. For instance, pretreatment can remove water and excess alkali before exposure to high temperature without damaging the structure [54]. erefore, proper pretreatment can increase the residual strength of the geopolymers.…”

Section: Test Conditionsmentioning

confidence: 99%

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Dai

Wang

2020

Advances in Civil Engineering

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Geopolymers are prepared by alkali solution-activated natural minerals or industrial waste materials, which have been widely used as new sustainable building and construction materials for their excellent thermal and mechanical properties. The thermal and mechanical properties of geopolymers at high temperature have attracted great attention from many researchers. However, there are few systematic works concerning these two issues. Therefore, this work reviewed the thermal and mechanical behaviors of geopolymers at high temperature. Firstly, the thermal properties of geopolymers in terms of mass loss, thermal expansion, and thermal conductivity after high temperature were explained. Secondly, the mechanical properties of residual compressive strength and stress-strain relationship of fly ash geopolymers and metakaolin geopolymers after high temperature were analyzed. Finally, the microstructure and mineralogical characteristics of geopolymers upon heating were interpreted according to the changes of microstructures and compositions. The results show that the thermal properties of geopolymers are superior to cement concrete. The geopolymers possess few mass loss and a low expansion ratio and thermal conductivity at high temperature. The thermal and mechanical properties of the geopolymers are usually closely related to the raw materials and the constituents of the geopolymers. Preparation and testing conditions can affect the mechanical properties of the geopolymers. The stress-strain curves of geopolymer are changed by the composition of geopolymers and the high temperature. The silicon-type fillers not only improve the thermal expansion of the geopolymers but also enhance mechanical properties of the geopolymers. But, they do not contribute to reducing the thermal conductivity. the different raw materials, aluminosilicate precursor and reinforcement materials, result in different geopolymer damage during the heating. However, phase transitions can occur during the process of heating regardless of the raw materials. The additional performance enhancements can be achieved by optimizing the paste formulation, adjusting the inner structure, changing the alkali type, and incorporating reinforcements.

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Fire resistance characteristics of geopolymer concrete for environmental sustainability: a review of thermal, mechanical and microstructure properties

Hassan

Arif

Shariq

et al. 2022

Environ Dev Sustain

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Effect of Carbon Fibers on Thermal and Mechanical Properties of Metakaolin-Fly Ash-Based Geopolymers

Cited by 3 publications

References 25 publications

Parametric studies on the workability and compressive strength properties of geopolymer concrete

Parametric studies on the workability and compressive strength properties of geopolymer concrete

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Fire resistance characteristics of geopolymer concrete for environmental sustainability: a review of thermal, mechanical and microstructure properties

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