Production of geopolymer binders using clay minerals and industrial wastes

Hamdi, Noureddine; Messaoud, Imen Ben; Srasra, Ezzeddine

doi:10.1016/j.crci.2018.11.010

Cited by 50 publications

(26 citation statements)

References 24 publications

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“…Geopolymer first recongnized in 1908 is a developing research field for utilizing mineral clays and industrial wastes (Hamdi et al, 2019;Palomo et al, 2014;Provis, 2014). It was utilized to manufacture precast structures, concrete and fixation of toxic metal waste (Ji and Pei, 2019;Davidovits, 1994).…”

Section: Introductionmentioning

confidence: 99%

Effect of phosphoric acid content on the microstructure and compressive strength of phosphoric acid-based metakaolin geopolymers

Gao

Zheng

Tang

et al. 2020

Heliyon

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The phosphoric acid-based metakaolin geopolymers were prepared by regulating H 3 PO 4 /Al 2 O 3 ratios. X-ray diffraction (XRD), thermogravimetry and differential scanning calorimeter (TG-DSC), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to determine the reaction process and phase formation. The results showed that the metakaolin calcined from Kaolinite mainly consisted of quartz crystalline phase and amorphous phase. The diffraction peak for quartz obviously became lower with the increasing of H 3 PO 4 /Al 2 O 3 ratios. The excessive quartz from metakaolin did not totally take part in the chemical reaction. The polymeric structure of -P-O-Si-O-Al-O constitutes the main building block of phosphoric acid-based metakaolin geopolymeric structure. The optimized compressive strength was 29 AE 2 MPa with H 3 PO 4 /Al 2 O 3 molar ratio ¼ 1.3:1. The simulation of the total deformation under 29 MPa load and the total heat flux at 1400 C of the phosphoric acid-based metakaolin geopolymers with H 3 PO 4 /Al 2 O 3 molar ratio of 1.3:1 based on finite element method verified the failure mechanism and the excellent thermal stability at high temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of phosphoric acid content on the microstructure and compressive strength of phosphoric acid-based metakaolin geopolymers

Gao

Zheng

Tang

et al. 2020

Heliyon

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“…Geopolymers have attracted interest in the last three decades. Many research papers on the synthesis of geopolymers have focused in the use of different aluminosilicates such as recycled industrial wastes [12,13] metakaolin [14][15][16][17], meltquenched aluminosilicates [18], grinded mineral resources such as volcanic scoria [19,20] and mixtures of two or more of these materials [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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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“…Different amorphous inorganic polymer materials developed by acidic or alkaline mediums have good mechanical properties [26], chemical properties and electrical properties [27,28], water resistance and thermal behavior [29], and acidic and alkaline environment resistance [30]. e mechanical, thermal, durability, microstructural, and dielectric performances of inorganic polymers or geopolymers were highly influenced by the type of raw materials [31], hydroxide concentration [32], alkaline solution type [26], Si/Al [23], SiO 2 /Na 2 O, Al 2 O 3 / Na 2 O ratios, maturation time [33], temperature curing [34], and so on.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Nature and Rate of Alkaline Activator on the Physicochemical Properties of Fly Ash‐Based Geopolymers

Alouani

Alehyen

Achouri

et al. 2020

Advances in Civil Engineering

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The influence of alkali cations on mix design of geopolymers is essential for their mechanical, thermal, and electrical performance. This research investigated the influence of alkali cation type on microscale characteristics and mechanical, dielectric, and thermal properties of fly ash-based geopolymer matrices. The geopolymers were elaborated via class F fly ash from the thermal plant Jorf Lasfar, El Jadida (Morocco), and several alkaline solutions. Morphological, structural, mechanical, dielectric, and thermal characteristics of materials synthesized via fly ash with different proportions of KOH and NaOH aged 28 days were evaluated. The physicochemical properties of class F fly ash-based geopolymers were assessed using X-ray diffraction (XRD), Fourier-transform infrared spectrometry (FTIR), and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDX) analyses. Based on readings of the results obtained, XRD and FTIR analysis detected the creation of semicrystalline potassium/sodium aluminate-silicate hydrate (KASH/NASH) gel in the elaborated matrices after the geopolymerization reaction. The SEM analysis proved the formation of alkali alumina-silicate hydrate gel in the raw material particles after the polycondensation stage. Experimental compressive strength data indicated that the highest compressive strength (39 MPa) was produced by the alkaline activator (75% KOH/25% NaOH). The dielectric parameters values of the elaborated materials changed depending of the mass ratios KOH/NaOH. Dielectric findings demonstrated that geopolymers containing 100% NaOH have better dielectric performances. The fire resistance study revealed that the geopolymer binders induced by KOH are stable up to 600°C. Based on these results, it can be deduced that the formulated geopolymer concrete possesses good mechanical, dielectric, and fire resistance properties.

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Production of geopolymer binders using clay minerals and industrial wastes

Cited by 50 publications

References 24 publications

Effect of phosphoric acid content on the microstructure and compressive strength of phosphoric acid-based metakaolin geopolymers

Effect of phosphoric acid content on the microstructure and compressive strength of phosphoric acid-based metakaolin geopolymers

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

Influence of the Nature and Rate of Alkaline Activator on the Physicochemical Properties of Fly Ash‐Based Geopolymers

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