The corrosion of kaolinite by iron minerals and the effects on geopolymerization

Kaze, Cyriaque Rodrigue; Moungam, Lynn Myllyam Beleuk à; Djouka, M. L. Fonkwe; Nana, Achile; Kamseu, Elie; Melo, U. F. Chinje; Leonelli, Cristina

doi:10.1016/j.clay.2016.12.040

Cited by 118 publications

(79 citation statements)

References 28 publications

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“…With heat treated laterite, we evidence the role of iron species from laterite (13.25 wt% of Fe2O3). It promotes the formation of a geopolymer structural network, as already studied in previous works [19,39,11,27].…”

Section: Discussionmentioning

confidence: 63%

“…The reactivity of mixtures is also related to the nature and content of different minerals as well as their size distributions [38,39]. Particularly, the role of iron containing mineral phases was also evidenced in previous studies [25,27,40,41].…”

Section: Characteristics Of Raw Materialsmentioning

confidence: 60%

“…In addition to studies focused in raw materials, a limited number of investigations have been made on geopolymers based on laterite, despite the wide distribution of this resource throughout the world, and especially in Cameroon [24][25][26][27]. Laterite and lateritic soil constitute 33% of available mineral resources in tropical and subtropical zones of Africa, Australia, India, South-East Asia and South America.…”

Section: Introductionmentioning

confidence: 99%

“…They are in the interval of 997-1041 cm −1 and are attributed to the symmetric stretching vibration of Si-O-Si and/or Si-O-Al and Si-O-Fe of the geopolymer gel. Bands near 412 cm −1 are the indication of the presence of ferrosialates Fe-O-Si(Al) issued from the dissolution of iron oxide in the alkaline solution.It contributes to the polycondensation process leading to geopolymer gel[11,27].…”

mentioning

confidence: 99%

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Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Poudeu¹,

Ekani²,

Djangang³

et al. 2019

ACSM

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This paper aims to develop a low-cost, green construction material for low-income house builders. A series of geopolymer samples were prepared by partially substituting the Cameroonian lateritic soil (LS) with different quantities of heat-treated laterite (20~50 wt. %). The chemical composition of the LS was determined through inductively coupled plasma spectroscopy (ICP). The specimens were subjected to thermogravimetric and differential thermal analyses (TGA/DTA), X-ray diffractometry (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). In addition, the compressive strength of dry and wet specimens was measured with a hydroelectric device. The results show that the geo-polymerization and properties like setting time and mechanical strength of the samples were improved through the combined action of the raw LS and the laterite treated at 500-600°C; the crystallized particles from non-clayed minerals and from aggregates of kaolinite also contribute to strength of the samples; crystalline phases formed a tridimensional skeleton in the microstructure of the geopolymer. The research provides a promising composite that can serve as a low-cost construction material with reduced environmental impact.

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Section: Discussionmentioning

confidence: 63%

Section: Characteristics Of Raw Materialsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Poudeu¹,

Ekani²,

Djangang³

et al. 2019

ACSM

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“…Also, the presence of iron which modifies the chemistry of the resulting system compared to other aluminosilicate based geopolymer makes iron-rich laterite-based geopolymer interesting for further studies. The change of the chemistry includes the iron incorporation in the 3D network playing the same role like Al (Lemougna et al, 2013;Djobo et al, 2016aDjobo et al, , 2016bKaze et al, 2017;Kaze et al, 2018b). Moreover, physical and mechanical properties of the iron-rich laterite based geopolymer were reported to be good enough to allow their use as construction materials (Lemougna et al, 2014;Lassinantti Gualtieri et al, 2015;Kaze et al, 2017Kaze et al, , 2018aKaze et al, , 2018b.…”

Section: Introductionmentioning

confidence: 99%

Iron-rich laterite-bagasse fibers based geopolymer composite: Mechanical, durability and insulating properties

Nkwaju

Djobo

Nouping

et al. 2019

Applied Clay Science

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This work reports the mechanical, durability and insulating properties of novel geopolymer composites made of iron-rich laterite and sugarcane bagasse fibers with sodium silicate as a hardener. The results showed that the addition of fibers was beneficial for improving the fracture behavior of iron-rich laterite based geopolymer from brittle to ductile. The 28 days compressive strength ranges from 50 MPa to 14 MPa with the content of fibers. The modulus of elasticity was improved by 50% with only 3 wt% of fibers. The geopolymer composites perform well after 20 wet-dry cycles with the improvement of its ductility. The 28 days thermal conductivity decreases from 0.77 W/mK to 0.55 W/mK with the fibers content.

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Inorganic Polymers (Geopolymers)

MacKenzie

2017

Encyclopedia of Polymer Science and Technology

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Geopolymers are ceramic-like inorganic polymers produced at low temperature, generally below 100 °C. They consist of chains or networks of mineral molecules linked with covalent bonds. The raw materials are mainly minerals of geological origin, hence the name "geopolymer". They comprise several molecular units for example: silico-oxide (Na,K)-(-Si-O-Si-O-) for (Na,K)-poly(silicate) or (Na,K)-poly(siloxonate), silico-aluminate (Na,K)-(-Si-O-Al-O) for (Na,K)poly(sialate), ferro-silico-aluminate (Na,K)-(-Fe-O-Si-O-Al-O-) or (Na,K)-poly(ferro-sialate), alumino-phosphate (-Al-O-P-O-) for poly(alumino-phosphate), formed in a geopolymerization process. We focus here on the reactivity of calcined kaolinite, an aluminosilicate oxide Si 2 O 5 Al 2 O 2 , metakaolin, which led to the discovery of geopolymers 40 years ago. A distinction is made between two synthesis routes: alkaline medium (Na+, K+, Li+, Ca++, Cs+ and the like) and acidic milieu (phosphoric acid, organic carboxylic acids). The alkaline route is the most important, so far. NMR spectroscopy provides data on the molecular structure and polymeric character. The geopolymerization mechanism starts with polycondensation of oligomers into small ribbon-like molecules. This intermediary stage involves several Si-OH groups together with H 2 O molecules. It is referred to as NASH or KASH by some cement scientists and generalized to the final geopolymer structure. The poly(sialate) final structure consists of well-polymerized individual elementary nanoparticles of 5 to 40 nm in size.

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The corrosion of kaolinite by iron minerals and the effects on geopolymerization

Cited by 118 publications

References 28 publications

Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor

Iron-rich laterite-bagasse fibers based geopolymer composite: Mechanical, durability and insulating properties

Inorganic Polymers (Geopolymers)

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