Design of low cost semi-crystalline calcium silicate from biomass for the improvement of the mechanical and microstructural properties of metakaolin-based geopolymer cements

Mabah, Dominique E. Tchinda; Tchakouté, Hervé K.; Rüscher, Claus H.; Kamseu, Elie; Elimbi, A.; Leonelli, Cristina

doi:10.1016/j.matchemphys.2018.10.061

Cited by 38 publications

(9 citation statements)

References 25 publications

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“…These concerns have raised the pressure for the development of more environmentally friendly binders. Amongst these binders, geopolymers and alkali activated materials have emerged recently as a possible alternative with potential to partly replace Portland cement [6][7][8][9][10][11][12][13][14][15][16]. Alkali activated materials were defined as materials that encompass any binder system derived from the reaction of solid or dissolved alkali metal source with a solid silicate powder, while geopolymers are in many instances viewed as a subset of alkali activated materials where the binding phase is almost exclusively aluminosilicate with low calcium content such as calcined clay and low calcium fly ashes [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of slag on the improvement of setting time and compressive strength of low reactive volcanic ash geopolymers synthetized at room temperature

Lemougna

Nzeukou

Aziwo

et al. 2020

Materials Chemistry and Physics

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This paper presents an investigation on the effect of ground granulated blast furnace slag on the geopolymerization of low reactive volcanic ash. Volcanic ash was blended up to 50 wt% with slag at 10% intervals. The fresh geopolymer samples were cured at 25 and 60 °C for 3, 7 and 28 days. XRD, FTIR, TG and SEM were used for phases analysis.The results outlined that only 10 wt% of slag was enough to reduce the initial setting time of the geopolymer from more than 7 days to couple of hours (6.7 hours). At 25 °C, the 28 days compressive strength increased with the addition of slag in the system until an optimum value of about 85 MPA. This strength development was suggested to arise from a synergetic formation of C-A-S-H /N-A-S-H gel. At 60 °C, curing for periods longer than 7 days was not beneficial for strength development. These results are of interest for the valorization of low reactive volcanic ashes in the development of structural geopolymers, with related environmental and socioeconomic benefits.

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Section: Introductionmentioning

confidence: 99%

Effect of slag on the improvement of setting time and compressive strength of low reactive volcanic ash geopolymers synthetized at room temperature

Lemougna

Nzeukou

Aziwo

et al. 2020

Materials Chemistry and Physics

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“…In explaining this issue, we look at how the body reacts to an external implant. Generally, implantation of a biomaterial in the human body may be confronted with four types of reactions: nearly inert, porous, restorable, and bioactive [36,37]. In a bioactive material, interfacial bonding of biomaterial and bones is created via ion-exchange processes between the implant and surrounding body fluids [38].…”

Section: Discussionmentioning

confidence: 99%

Fabrication and Characterization of a Nanofast Cement for Dental Restorations

Yousefi

Manesh

Khalifeh

et al. 2021

BioMed Research International

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This study was aimed at fabricating and evaluating the physical and bioproperties of nanofast cement (NFC) as a replacement of the MTA. The cement particles were decreased in nanoscale, and zirconium oxide was used as a radiopacifier. The setting time and radiopacity were investigated according to ISO recommendations. Analysis of color, bioactivity, and cytotoxicity was performed using spectroscopy, simulated body fluid (SBF), and MTT assay. The setting time of cement pastes significantly dropped from 65 to 15 min when the particle sizes decreased from 2723 nm to 322 nm. Nanoparticles provide large surface areas and nucleation sites and thereby a higher hydration rate, so they reduced the setting time. Based on the resulting spectroscopy, the specimens did not exhibit clinically noticeable discoloration. Resistance to discoloration may be due to the resistance of zirconium oxide to decomposition. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and infrared spectroscopy (FTIR) examinations of the immersed SBF samples showed apatite formation that was a reason for its suitable bioactivity. The results of cell culture revealed that NFC is nontoxic. This study showed that NFC was more beneficial than MTA in dental restorations.

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“…The composition of eggshells are as follows: CaCO 3 is nearly 94% of the overall weight, organic matter is approximately 4%, Ca 3 (PO 4 ) 2 (calcium phosphate) is around 1%, and MgCO 3 (magnesium carbonate) is almost 1% 104 . Mabah et al 105 investigated the chemical makeup of ES powder using XRF analysis and discovered that with calcium oxide (CaO, 93.2%), it has the greatest proportion between all the ingredients. By weight, ES contains 93.70% CaCO 3 , 4.20% organic content, 1.30% MgCO 3 , and 0.8% Ca 3 (PO 4 ) 2 , according to Okonkwo 106 .…”

Section: Methodsmentioning

confidence: 99%

The metaheuristic optimization of the mechanical properties of sustainable energies using artificial neural networks and genetic algorithm: A case study by eggshell fine waste

Wang

AL‐Huqail

Salimimoghadam

et al. 2022

Intl J of Energy Research

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Summary Eggshell concrete is a novel green material that aids the recycling of eggshell powder (ESP) waste while decreasing the environmental damage due to higher manufacture to develop sustainable energies. Nevertheless, current investigations on eggshell concrete are limited, and the results might vary according to admixture design variations. Despite the fact that the design of experiments is utilized to simplify and optimize the research of sustainable energies, the studies employing eggshell concrete are still uncommon. The powdered egg shells were employed as fine concrete aggregate as a tool of sustainable energies. The flexural and compressive strength of concrete with (5%, 10%, and 15%) and without egg shell are examined, and the findings are predicted by artificial neural network (ANN) and genetic algorithm (GA) as a hybridized model of ANN‐GA. The contour plot research revealed that eggshell powder boosted the energy stability in an appropriate replacement proportion of 5% to 10%. Conversely, for mix designs with a larger water ratio, the partial substitution with eggshell powder is preferable. The findings demonstrate that with 5% ESP replacement, the strengths were greater than in control concrete, indicating that 5% ESP is an ideal content for maximal strength. Furthermore, in terms of transport qualities, the performance of ESP concretes was equivalent to control concrete up to 15% ESP substitution. The statistical regression indices as determination coefficient (R2) and root‐mean‐square error demonstrated that the ANN‐GA model is an effective tool for formulating and predicting the flexural and compressive strength of eggshell concrete to develop sustainable energies.

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Design of low cost semi-crystalline calcium silicate from biomass for the improvement of the mechanical and microstructural properties of metakaolin-based geopolymer cements

Cited by 38 publications

References 25 publications

Effect of slag on the improvement of setting time and compressive strength of low reactive volcanic ash geopolymers synthetized at room temperature

Effect of slag on the improvement of setting time and compressive strength of low reactive volcanic ash geopolymers synthetized at room temperature

Fabrication and Characterization of a Nanofast Cement for Dental Restorations

The metaheuristic optimization of the mechanical properties of sustainable energies using artificial neural networks and genetic algorithm: A case study by eggshell fine waste

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