Study of In Situ Foamed Fly Ash Geopolymer

Su, Zijian; Hou, Wei; Sun, Zengqing; Lv, Wei

doi:10.3390/ma13184059

Cited by 17 publications

(13 citation statements)

References 31 publications

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“…The properties of fly ash are determined by many factors, with the most important being: the type of coal burned; type of installation in which coal combustion takes place, i.e., type of boiler and technological combustion conditions; fuel preparation method; method of ash capture, discharge and storage; gas desulphurization technology and the type of SO 2 sorbent used. Each coal particle may contain different amounts of different inorganic substances and thus the resulting ash may be highly heterogeneous [47,48].…”

Section: Eds and Xrd Studies Of The Precursormentioning

confidence: 99%

Evaluation of Hybrid Melamine and Steel Fiber Reinforced Geopolymers Composites

et al. 2020

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This study investigated the influence of the steel and melamine fibers hybridization on the flexural and compressive strength of a fly ash-based geopolymer. The applied reinforcement reduced the geopolymer brittleness. Currently, there are several types of polymer fibers available on the market. However, the authors did not come across information on the use of melamine fibers in geopolymer composites. Two systems of reinforcement for the composites were investigated in this work. Reinforcement with a single type of fiber and a hybrid system, i.e., two types of fibers. Both systems strengthened the base material. The research results showed the addition of melamine fibers as well as steel fibers increased the compressive and flexural strength in comparison to the plain matrix. In the case of a hybrid system, the achieved results showed a synergistic effect of the introduced fibers, which provided better strength results in relation to composites reinforced with a single type of fiber in the same amount by weight.

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Section: Eds and Xrd Studies Of The Precursormentioning

confidence: 99%

Evaluation of Hybrid Melamine and Steel Fiber Reinforced Geopolymers Composites

et al. 2020

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“…The vast majority of research studies use aluminum powder and hydrogen peroxide (H 2 O 2 ) as pore-forming agents and fly ash as a precursor [19,[21][22][23][24]. Su et al [25] studied a foamed fly ash geopolymer where fly ash was activated by sodium silicate solution, and an aluminum powder was employed as an in situ chemical foaming agent. For densities from 1200 to 600 kg/m 3 , the thermal conductivity diminished from 0.70 to 0.22 W/(m.K), which is much better than that of its counterpart, ordinary Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the properties of a foamed geopolymer developed with different types of metakaolin

et al. 2021

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The physical and mechanical properties of foamed geopolymers were determined. The geopolymers were made with two different metakaolins (from Metacaulim do Brasil -MB, and Pantano Grande/RS -MPG) as precursors, with NaOH and Na 2 SiO 3 as activators, and with the addition of foam, which was produced with the foaming agent diethanolamide of coconut fatty acid with a minimum of 80% concentration. Also, two times (2.5 and 4 h) were used for the calcination of MPG at 750 °C. The results showed that all factors (precursors type, alkali content, silica modulus, and foam content) had a significant influence on the response variables, which presented the following variations: compressive strength of 0.36 to 3.23 MPa; thermal conductivity from 0.22 to 0.42 W/(m.K); saturated bulk density from 1176 to 1364 kg/m 3 ; dry bulk density of 619 to 864 kg/m 3 ; air void from 46.4% to 62.5%; and water absorption from 55.7% to 95.4%. It was also concluded that the precursor type was the factor that had the most influence on the properties of foamed geopolymers, with MPG calcined for 4 h being the best, as greater compressive strength and low thermal conductivity were obtained.

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“…In addition, two previous studies measured both water absorption and compressive strength. 37,38 The water absorption of the proposed geopolymer foam is also remarkably lower than the counterparts of a similar compressive strength. It therefore demonstrates that the proposed geopolymer foam possesses a significant lower water absorption relative to other FA-based geopolymer foams.…”

Section: Comparisonsmentioning

confidence: 89%

“…As a result, a total of 52 datasets were assembled from 14 studies for comparison. [9][10][11]37,38,[43][44][45][46][48][49][50][51][52] Figure 9 collects the compressive strengths of the geopolymer foams. Generally, the proposed geopolymer foams exhibit superior compressive strength even in comparison to the FA/GGBFS geopolymer foams reported in the literature, except for the one with a thermal conductivity of .21 W/mK.…”

Section: Comparisonsmentioning

confidence: 99%

Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

Zhou

Xie

et al. 2023

Int J Applied Ceramic Tech

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Geopolymer foam has emerged as a promising inorganic porous material in the last decade. Despite of the numerous advantages, there are some pending issues to be addressed, on top of that is the low compressive strength. To overcome this, this study synthesizes a high‐strength geopolymer foam by the partial substitution of fly ash (FA) with ground granulated blast furnace slag and carries out an intensive investigation into its microstructure, pore properties, thermal conductivity as well as compressive behavior. The microstructure is firstly analyzed by X‐ray diffraction and Fourier transform infrared spectroscopy techniques. The pore characteristics are also scrutinized, including pore size distribution, total porosity and water absorption. Then, the thermal conductivity is investigated and the applicability of basic effective thermal conductivity models to characterize the relationship with total porosity is evaluated. Afterward, the compressive strength together with the softening coefficient is examined, and the relationship with total porosity is also studied. Finally, comparisons between the proposed geopolymer foam and other FA‐based geopolymer foams in the literature are performed. The results show that the proposed geopolymer foam possesses not only a comparable thermal conductivity but also a far superior compressive strength, which sheds light on the widespread applications in thermal insulation.

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Study of In Situ Foamed Fly Ash Geopolymer

Cited by 17 publications

References 31 publications

Evaluation of Hybrid Melamine and Steel Fiber Reinforced Geopolymers Composites

Evaluation of Hybrid Melamine and Steel Fiber Reinforced Geopolymers Composites

Evaluation of the properties of a foamed geopolymer developed with different types of metakaolin

Investigation on pore properties, thermal conductivity, and compressive behavior of fly ash/slag‐based geopolymer foam

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