Design of Inorganic Polymer Mortar from Ferricalsialic and Calsialic Slags for Indoor Humidity Control

Kamseu, Elie; Lancellotti, Isabella; Modolo, Luca; Leonelli, Cristina

doi:10.3390/ma9060410

Cited by 16 publications

(9 citation statements)

References 29 publications

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“…However, the final material has still a composite microstructure with a matrix phase having a gel structure where coarse aggregates of unreacted phases are distributed. Their quantities and distribution are parameters that favor the optimization of material properties [50,51]. Since larger zones of the matrix phase are detrimental to strength, this work show that a limited fraction of a heat-treated laterite must be added (30 wt% of LN500) to attain a value of 18.25 MPa that meets the standard mechanical strength [52].…”

Section: Discussionmentioning

confidence: 80%

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: 80%

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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“…These absorptions have been attributed to both atmospheric and bound water in geopolymers. 10,11 The bands at 1424 cm -1 and 878 cm -1 point to carbonate presence. 12 This is probably caused by the reaction of atmospheric CO 2 with calcium hydroxide (band at »878 cm -1 ) (sample GPRM1 and sample GPRM2).…”

Section: Ftir Analysismentioning

confidence: 99%

“…Some authors reported that geopolymers are focused on the behavior of Si-O-Si and Si-O-Al bands. [10][11][12][13] Taking a straightforward approach, the identification of the position of the main Si-O-T (T=Si or Al) asymmetric stretching vibration (the strongest band) is here defined as the point of maximum absorbance in the region 1250-950 cm -1 and at 420-500 cm -1 . These peaks will be referred to as the "main band" in the spectrum of the geopolymers.…”

Section: Ftir Analysismentioning

confidence: 99%

Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2

Bošković¹,

Vukčević²,

Nenadović³

et al. 2019

Mater. Tehnol.

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Geopolymers are an emerging class of materials that offer an alternative to the Portland cement as the binder of structural concrete. One of the advantages is that the primary source of their production is waste alumosilicate materials from different industries. One of the key issues in geopolymer synthesis is the low level of mechanical properties due to porosity as well as the high activity of conductivity carriers. It can often lead to limited application possibilities, so the objective is to obtain an enhanced strength as well as decreased cracking tendency through microstructure modification. The introduction of Ca(OH)2, under certain pH conditions could lead to the filling-the-pores process and improving the mechanical properties. The aim was to understand the role that calcium plays in the geopolymer synthesis, and to define which reaction prevails under the synthesis conditions: formation of geopolymer gel or calcium silicate hydrate that contains aluminum substitution (CASH). The synthesis was performed with different raw materials (with or without red mud) and different alkalinity conditions. Ca(OH)2 was the obligatory supplement to both of the mixtures. Different techniques were performed for the testing of reaction products, as well as to define the microstructural changes as the generator of improved mechanical properties and changed electrical conductivity. The characteristics of the geopolymer's macrostructure were defined by means of an SEM analysis. Compressive strength and electrical conductivity are among the investigated product's properties. X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR) were used for the identification of various crystalline phases and an amorphous phase.

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“…This might suggest the formation of some new sixfold-coordinated ferric sites most probably located at amorphous gel-like phases 40 . These amorphous iron-rich phases have different structural characteristics than the typical aluminosilicate structure of the geopolymer gel, and certainly the presence of iron into the adhesive bonds influences the overall strength of the geopolymer composite 41 . www.nature.com/scientificreports/ Leachability.…”

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confidence: 99%

Influence of red mud and waste glass on the microstructure, strength, and leaching behavior of bottom ash-based geopolymer composites

Bobiricǎ¹,

Orbeci²,

Bobiricǎ³

et al. 2020

Sci Rep

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The influence of waste glass and red mud addition as alternative source of aluminosilicate precursors on the microstructural, mechanical, and leaching properties of bottom ash-based geopolymer was studied in this work through mineralogical, morphological, and spectroscopic analysis, as well as by conducting compressive strength and leaching tests. The bottom ash-based geopolymer composites were synthesized by adding a constant amount of waste glass (10% by weight) and increasing amounts of red mud (up to 30% by weight). The results derived from FTIR, 29Si and 27Al MAS NMR, and SEM–EDX revealed that adding up to 10% (by weight) red mud to the synthesis mixes leads to an increase in the degree of geopolymerization of the activated mixes. The compressive strength followed the same trend. An increase of more than 10% (by weight) red mud added to the synthesis mixes results in a significant decrease of compressive strength of the geopolymer composites. A low leachability of geopolymer composites in regard with their contaminants was revealed especially for those with good compressive strength.

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Design of Inorganic Polymer Mortar from Ferricalsialic and Calsialic Slags for Indoor Humidity Control

Cited by 16 publications

References 29 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

Characterization of red mud/metakaolin-based geopolymers as modified by Ca(OH)2

Influence of red mud and waste glass on the microstructure, strength, and leaching behavior of bottom ash-based geopolymer composites

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