The effect of SiO2/Al2O3 ratio on the structure and microstructure of the glazes from SiO2–Al2O3–CaO–MgO–Na2O–K2O system

Partyka, Janusz; Sitarz, Maciej; Leśniak, Magdalena; Gasek, Katarzyna; Jeleń, Piotr

doi:10.1016/j.saa.2014.06.068

Cited by 60 publications

(23 citation statements)

References 14 publications

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“…Thus, it has been established that these ceramic products could replace natural aggregates in concrete, due to the observed strength performance of such concretes. Furthermore, the improved properties of concrete with ceramic can be attributed to the high specific surface of ceramic [13], as well as the high concentration of silica (SiO2) and alumina (Al2O3) in ceramic amorphous phase [19,20]. As a result, the pozzolanic reactivity of ceramic in concrete can be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Awoyera

Dawson

Thom

et al. 2017

Construction and Building Materials

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Using industrial wastes and local materials as artificial aggregates in cement based materials remains a relevant measure for conservation of natural sources. In this study, novel cementitious mixes containing pulverized ceramic blended cement, ceramic aggregate and laterite were systematically combined to produce cement mortars. The mortar specimens were cured in water for a maximum of 28 days. At maturity, nondestructive tests, X-ray CT scan and Ultrasonic pulse velocity, were performed on hardened mortars. Thereafter, a series of predefined properties, namely dry bulk density, compressive and flexural strength, water absorption coefficient (due to capillary) of the hardened mortars were determined. Finally, in order to understand the hydration mechanism of the materials as it relates to the strength properties, microscale tests, SEM and XRD, were used to examine the fragments of the selected mortars. From the results, a mortar sample containing 10% ceramic powder and 100% ceramic aggregate as replacements for cement and sand respectively, gave higher strength values than the reference and other mixes.Microstructural analysis of the best mix revealed that it has larger proportions of ettringite, portlandite and calcite than the reference mix, and this could be responsible for the strength 2 gained. Thus, despite the apparent low reactivity of crushed ceramic material, this can improve bonding in cement-based mixture, when used at an appropriate concentration.

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Section: Introductionmentioning

confidence: 99%

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Awoyera

Dawson

Thom

et al. 2017

Construction and Building Materials

View full text Add to dashboard Cite

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“…The spectra of both Gn1 and Gn2 glasses show bands at 460, 897, 1090, and 1216 cm −1 . The assignments of these bands are described in Table . The band at 1216 cm −1 is assigned to Si‐O stretching vibration.…”

Section: Resultsmentioning

confidence: 99%

Crystallization, mechanical, and optical properties of transparent, nanocrystalline gahnite glass‐ceramics

et al. 2017

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This paper describes the preparation of a transparent glass‐ceramic from the SiO2‐K2O‐ZnO‐Al2O3‐TiO2 system containing a single crystalline phase, gahnite (ZnAl2O4). TiO2 was used as a nucleating agent for the heat‐induced precipitation of gahnite crystals of 5‐10 nm. The evolution of the ZnAl2O4 spinel structure through the gradual formation of Al‐O bonds was examined by infrared spectroscopy. The dark brown color of the transparent precursor glass and glass‐ceramic was eliminated using CeO2. The increase in transparency of the CeO2‐doped glass and glass‐ceramics was demonstrated by UV‐visible absorption spectroscopy. EPR measurements confirmed the presence of Ce3+ ions, indicating that CeO2 was effective in eliminating the brown color introduced by Ti3+ ions via oxidation to Ti+4. The hardness of the glass‐ceramic was 30% higher than that of the as‐prepared glasses. This work offers key guidelines to produce hard, transparent glass‐ceramics which may be potential candidates for a variety of technological applications, such as armor and display panels.

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“…The increasing intensity of the 778 and 723 cm À 1 bands as associated with the bending vibration of Si-O-Si [8, [10][11][12][13] and the 470 and 430 cm À 1 bands as associated with the bending vibration of O-Si-O [8,[10][11][12][13] can be linked to an increased level of glaze structure arrangement, which means there are fewer broken Si-O À bonds. When examining the major bands in the 1400-840 cm À 1 , a slight shift of band maxima towards higher wavenumbers can be observed from 1037 cm À 1 for the material without BaO to 1042 cm À 1 for all materials with the addition of BaO.…”

Section: Resultsmentioning

confidence: 99%

“…The SiO 2 /Al 2 O 3 ratio determines the characteristic temperatures (transformation, softening, half sphere etc.) of glass-ceramic materials and, therefore, their application [4,5,[11][12][13]. In this study, the molar ratio of these oxides was fixed to 6.5.…”

Section: Introductionmentioning

confidence: 99%

The effect of SiO2/Al2O3 ratio on the structure and microstructure of the glazes from SiO2–Al2O3–CaO–MgO–Na2O–K2O system

Cited by 60 publications

References 14 publications

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Crystallization, mechanical, and optical properties of transparent, nanocrystalline gahnite glass‐ceramics

Effect of BaO ratio on the structure of glass–ceramic composite materials from the SiO2–Al2O3–Na2O–K2O–CaO system

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