Effects of curing cycles on developing strength and microstructure of goethite-rich aluminosilicate (corroded laterite) based geopolymer composites

Fekoua, Joëlle Nadia Nouping; Kaze, Cyriaque Rodrigue; Duna, Linda Lekuna; Ghazouni, Armeni; Ndassa, Ibrahim Mbouombuo; Kamseu, Elie; Rossignol, Sylvie; Leonelli, Cristina

doi:10.1016/j.matchemphys.2021.124864

Cited by 18 publications

(4 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption band at 1027 cm −1 is characteristic of Si–O bonds of crystalized quartz. The absorption band at 1007 cm −1 is the principal band that demonstrates the aluminosilicate: Si– O -M (M = Si, Fe and Al) [ 26 ], typical of the laterites under study. The absorption band at 905 cm −1 is linked to Si–O of stretched kaolinite.…”

Section: Resultsmentioning

confidence: 99%

“…After the collection, all the samples were dried in an oven at 105 °C for 24 h, in order to remove residual water and facilitate the grinding process. In fact, according to previous work, the TGA of laterites show that Physisorbed water is generally evaporated between 45 and 100 °C [ 20 ] Then, they were ground up separately to total particles passing through a 75 μm sieve. After which they were calcined at three temperatures (550, 575 and 600 °C) for 4 h at a heating rate of 5 °C/min in a programmable electric furnace.…”

Section: Experimention and Characterization Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Natural iron-aluminosilicate as potential solid precursor for supplementary cementitious materials: A comparative study with other aluminosilicates

Nouping Fekoua,

Venyite,

Bila

et al. 2023

Heliyon

Self Cite

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Experimention and Characterization Methodsmentioning

confidence: 99%

Natural iron-aluminosilicate as potential solid precursor for supplementary cementitious materials: A comparative study with other aluminosilicates

Nouping Fekoua,

Venyite,

Bila

et al. 2023

Heliyon

Self Cite

View full text Add to dashboard Cite

“…The 60°C treated rGO shows a higher ID/IG value in Raman Spectroscopy analysis, indicating a greater degree of structural defects which is optimum for adhesion to the geopolymer matrix (Kani and Allahverdi, 2009). Thirdly, steam curing has been reported to reduce porosity within geopolymer matrix, resulting in higher mechanical strength (Fekoua et al, 2021). For the geopolymer composites cured under steam condition, the obtained Si:Al ratio and K:Al ratio is closer to the designed composition than the same geopolymer composites that are cured in room temperature, which indicates a higher formation of aluminosilicate gel from the material source (Kani and Allahverdi, 2009).…”

Section: Flexural Analysis On the Graphene Reinforced Geopolymer Nanocompositesmentioning

confidence: 99%

Mechanical Strength of Graphene Reinforced Geopolymer Nanocomposites: A Review

Tay

Mazlan

2021

Front. Mater.

View full text Add to dashboard Cite

The emergence of high-strength graphene marks a new milestone in the material science field. With only a small percentage inclusion into the matrix system, this organic nanoparticle could tremendously improve the strength in vast arrays of composites. At the same time, there is a growing interest in using the low-cost, lightweight, and high early strength geopolymer as the new binder for concrete. Compared to the traditional Ordinary Portland Cement (OPC), geopolymer emits 80% less CO2 during its production while exerting similar strength. Thus, the geopolymer has the potential to commercialize as new and green concrete. Geopolymer is a mixture of aluminosilicate powders and alkaline solutions. When incorporated with nano-sized graphene, the material forms a composite known as Graphene Reinforced Geopolymer Nanocomposite (GRGN). The addition of graphene enhances the strength of geopolymer, which can further improve its competitiveness. However, this depends on several factors, including the types of graphene, the surface modification of graphene, and the concentration of alkaline solutions. Generally, the presence of graphene alters the porous structure of geopolymer into a substantially filled porous structure, thus increasing compressive strength and flexural strength. On the other hand, Graphene Oxide (GO) undergoes a chemical reduction in the alkaline solution, producing epoxy functional groups. The chemical treatment results in two conditions which are weak interaction between graphene and geopolymer matrix, and better graphene dispersibility in geopolymer matrix. This review also highlights the analytical modelling aspect of GRGN. The dissolution of Si(OH)4 and Al(OH)4- from the aluminosilicate source was consistent with experimental work and analytical modeling, while the dissolution of Si–OH on the surface-modified graphene indicated otherwise. Therefore, this paper will provide an insightful review of the GRGN mechanical properties.

show abstract

“…Activation of silicates enhances the solubility of raw materials and generates advantageous mechanical characteristics. Diverse curing conditions are recorded for different raw materials and activators [16]. The geo-polymers rely upon thermally activated herbal materials like Meta kaolinite or business byproducts like fly ash or slag to offer a source of silicon (Si) and aluminum (Al).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Influence of Palm Kernel Shell Ash on Ire Clay Geopolymer Concrete Cured at Ambient Temperature

Olulope

Oluborode

Popoola

2023

ASRJ

View full text Add to dashboard Cite

There is an abundance of clay deposit in Ire Ekiti which can serve as geopolymer source material and Palm kernel shell exists as a massive agro waste in South Western Nigeria. This study evaluates the effect of palm kernel shell ash (PKSA) as an additive on the compressive strength of Ire clay geopolymer concrete. The objective of the study is to determine the selected properties of the obtained concrete at room temperature. Palm kernel shell was burned at 650oC for 2 hours in a furnace. Natural clay collected from Ire Ekiti was manually pulverized, air dried and calcined in a furnace at 750o for 2 hours. The geopolymer concrete was prepared at a mixing ratio of 1:2:3. The material constituents were calcined clay (source material), 12M of NaOH and Na2SiO3 (ratio of NaOH to Na2SiO3 was 2:5), river sand and 12.5mm granite were the fine and coarse aggregates respectively while PKSA of 0%,7.5% and 15% of the calcined Ire Clay content were used as additive in preparing the geopolymer concrete. geopolymer concrete specimens were cured at ambient temperature till testing at different maturity ages of 7, 14 and 28 days. It was generally observed that increasing the percentage of PKSA as additive strongly improved the compressive strength gain with maturity of the Ire clay geopolymer concrete. At 28 days maturity, 7.5% PKSA addition improved the compressive strength by 166% while 15% PKSA addition improved the strength by 181% increase. The highest compressive strength was 7.67N/mm2 at 15% PKSA addition on 28 day. Conclusively, Ire clay and PKSA are viable source material and additive respectively for geopolymer concrete production. The Ire clay geopolymer concrete can be practically applied like conventional concrete in structural work especially in a rural community like Ire Ekiti where cement needs to be transported over kilometers. Also, the concrete performing well at ambient temperature makes it cost effective compare to most geopolymers that require heating at high temperature. It is recommended that further study on the durability should be done.

show abstract

Effects of curing cycles on developing strength and microstructure of goethite-rich aluminosilicate (corroded laterite) based geopolymer composites

Cited by 18 publications

References 47 publications

Natural iron-aluminosilicate as potential solid precursor for supplementary cementitious materials: A comparative study with other aluminosilicates

Natural iron-aluminosilicate as potential solid precursor for supplementary cementitious materials: A comparative study with other aluminosilicates

Mechanical Strength of Graphene Reinforced Geopolymer Nanocomposites: A Review

Evaluating the Influence of Palm Kernel Shell Ash on Ire Clay Geopolymer Concrete Cured at Ambient Temperature

Contact Info

Product

Resources

About