Effects of calcination temperature of kaolinite clays on the properties of geopolymer cements

Elimbi, A.; Tchakouté, Hervé K.; Njopwouo, D.

doi:10.1016/j.conbuildmat.2010.12.055

Cited by 278 publications

(129 citation statements)

References 19 publications

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“…However, the too-high calcination temperature (e.g., 850 • C) is not preferable for geopolymer synthesis from clayey aluminosilicate materials. This leads to a decrease in the occurrence of the disordering and metastable phase inside the crystal structure of the aluminosilicate source, resulting in declining pozzolanicity and compressive strength of the resultant geopolymer [33]. This hypothesis is supported by the XRD patterns of calcined samples that show the dominance of the unreactive crystalline phases at 850 • C including wollastonite and quartz.…”

Section: Effect Of Calcination Temperaturessupporting

confidence: 63%

“…The increase of strength performance with the increment of calcination is interpreted as a result of the increase of dehydroxylation and decarbonation of aluminosilicate source, which results in an increase in the formation of both more reactive metastable phase and CaO. This strengthening behavior as a function of calcination temperature is also documented in literature [33,34]. Although a faster hardening of geopolymer paste was observed at 850 °C, the strength measurements quickly dropped to 8.86 MPa.…”

Section: Effect Of Calcination Temperaturesmentioning

confidence: 59%

“…The main aim of calcination is a thermal activation of the aluminosilicate source to increase its pozzolanicity during the alkali activation reaction [33]. The present study has shed light on the strength efficiency of marl-based geopolymer calcined at various temperatures of 550, 650, 750 and 850 °C.…”

Section: Effect Of Calcination Temperaturesmentioning

confidence: 93%

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Building up and Characterization of Calcined Marl-Based Geopolymeric Cement

2018

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Abstract:The present study mainly investigates the synthesis of calcined marl-based geopolymeric cement under different synthesis conditions including NaOH concentration, sodium silicate (SS)/sodium hydroxide (SH) mass ratios, solid (S)/liquid (L) mass ratios, calcination temperatures, curing temperatures, curing times, and aging intervals. The studied head sample was obtained from the Abu-Tartur phosphate mine in the Western Desert of Egypt and subjected to chemical and mineralogical characterizations using X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform-infrared spectroscopy (FT-IR). Regarding calcination, this was conducted at 550, 650, 750, and 850 • C for one hour and resulted in thermal decomposition of calcite and saponite and the formation of new mineral phases including anthophyllite, wollastonite, and silica. On the other hand, the geopolymerization process was initiated by mixing the calcined marl sample with the alkali activation solution at different mixing ratios and varying curing conditions. The compressive strength measurements indicate that 750 • C, 12 M NaOH, 0.6 SS/SH mass ratio, 2 S/L mass ratio, 80 • C curing temperature, 12 h curing time, and 28 days aging time are considered all to be the optimum synthesis conditions of the Abu-Tartur calcined marl-based geopolymer.

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Section: Effect Of Calcination Temperaturessupporting

confidence: 63%

Section: Effect Of Calcination Temperaturesmentioning

confidence: 59%

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Building up and Characterization of Calcined Marl-Based Geopolymeric Cement

2018

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“…The raw materials widely used are volcanic scoria, metakaolin, fly ash, blast furnace slag, etc. [15]. Recent investigations have shown that the thermal behavior of geopolymers from alkaline solution present good mechanical properties [1], chemical properties [16] and thermal properties [17,18].…”

Section: Introductionmentioning

confidence: 99%

Water resistance and thermal behavior of metakaolin-phosphate-based geopolymer cements

Bewa

Tchakouté

Fotio

et al. 2018

Journal of Asian Ceramic Societies

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The main target of this work was to investigate the thermal behavior and water resistance of geopolymer cement made from metakaolin as an aluminosilicate source using phosphoric acid solution (10 M) as a hardener. The obtained geopolymer cements were cured at room temperature for 28 days, the one part was treated at 200°C, 400°C, 600°C, 800°C and 1000°C, and the others were soaked in water for 28 days. The geopolymer cements were characterized by microstructural properties using X-ray diffractometry, infrared spectroscopy, microstructure, physical property based on water resistance and thermo-mechanical properties (thermal analysis, compressive strength). The results show that the compressive strength of the unheated geopolymer cement was 87.96 MPa. The ones soaked in water revealed a strength of 40.71 MPa. This indicates that the specimens soaked in water lose about 54% of their strengths. The X-ray patterns of heated geopolymer cements showed the formation of crystalline phases even at relatively low temperatures. It was typically found that the compressive strength of metakaolin-phosphate-based geopolymer cements decreases due to the hydrolysis of Si-O-P bonds in the presence of water. ARTICLE HISTORY

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“…There exist a large number of starting materials rich in alumina and silica with the potential for producing of inorganic polymers [6,7]. Among these materials the most common geopolymeric reactants in the past decades are kaolinite and metakaolinite [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Suitability of Illite Based Clays of Latvia for Chemical and Thermal Activation

Sperbergs

Rundāns

Sedmale

et al. 2014

Material Science and Applied Chemistry

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Abstract. Materials has been synthesized in the temperature range from 600-800 0 C from illite based clays of Latvia under activation of KOH and NaOH solutions (4-6 M). Compressive strength and apparent porosity were measured. The effect of the concentration of KOH and NaOH solutions on the material mechanical properties was investigated by means of infrared spectroscopy (IR). Compressive strength data of the materials showed that via such activation building materials with good quality can be obtained.

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Effects of calcination temperature of kaolinite clays on the properties of geopolymer cements

Cited by 278 publications

References 19 publications

Building up and Characterization of Calcined Marl-Based Geopolymeric Cement

Building up and Characterization of Calcined Marl-Based Geopolymeric Cement

Water resistance and thermal behavior of metakaolin-phosphate-based geopolymer cements

Suitability of Illite Based Clays of Latvia for Chemical and Thermal Activation

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