Heating effects on physical and strength characteristics of fireclay from the Nigerian Coal Measures Formation

Eze, E.O.; Onabanjo, S.A.

doi:10.1016/0169-1317(94)00024-k

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…1,2 The mechanical properties of these low-temperature-sintered materials are weak, but a significant strengthening can be obtained by favoring the growth of crystalline phases dispersed in the material. In particular, it is suitable for traditional firing techniques in African countries.…”

Section: Introductionmentioning

confidence: 99%

Structural transformation of a kaolinite and calcite mixture to gehlenite and anorthite

Traoré

Blanchart

2003

J. Mater. Res.

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Kaolinite mixed with calcite was sintered at low temperature (1100°C; 5°C/min). The successive phase transformations are metakaolinite to gehlenite and then anorthite, although the available phase diagram indicates a direct anorthite recrystallization. Transmission electron microscopy and electron diffraction studies of nanocrystallites revealed that the transformation path is favored by the structural similarities of phases. In particular, the pseudolayers of gehlenite have a major orientation relationship with the initial metakaolinite layers. The gehlenite axis, [001] G , is parallel to the metakaolinite axis, [001] A . This direct transition is favored by the existence of Si tetrahedral units and 4-fold-coordinated Al in both structures. Ca atoms, initially in the interlayer spacing of metakaolinite, remain in the interlayers of gehlenite. During the second transformation step, anorthite recrystallizes from gehlenite with axis [020] A parallel to [210] G . It is proposed that this orientation relationship is favored by the orientation and shape of Ca-atom channels through both structures, along [001] G and [100] A axes.

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Section: Introductionmentioning

confidence: 99%

Structural transformation of a kaolinite and calcite mixture to gehlenite and anorthite

Traoré

Blanchart

2003

J. Mater. Res.

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“…Al etc. Fe 2 O 3 limits the usability of all materials for an application in a high temperature environment; a recommendation from available literature coincides to limit the maximum amount on 4 % of weight [24]. The utilization of waste material, which additionally had been exposed to a temperature loading process -during brick manufacturing, made the added value.…”

Section: Componentmentioning

confidence: 99%

Applicability of Carbon Fibres in Refractory Cement Composites

2018

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The main objective of this article is to present the influence of high temperatures on mechanical properties of advanced refractory cement composite reinforced with carbon fibres. The presented material is suitable for industrial applications and can withstand elevated temperatures up to 1000 °C. The action of high temperatures was investigated on two temperature levels 600 °C and 1000 °C and was compared to reference specimens dried at 105 °C. The carbon fibres with flexural strength of 4100MPa were applied in dosage 0.50 %, 0.75% and 1.00% of the total volume. The second investigated modification was mutual ratio between aluminous cement and fine ceramic powder. The influence of high temperatures was investigated by measuring the bulk density, compressive and flexural strength, dynamic modulus of elasticity and fracture energy; all measured on prismatic specimens 40 × 40 × 160 mm. The workability of fresh mixture was limited by the maximum dosage of carbon fibres in 1% of the total volume. Based on the workability and evaluation of residual mechanical properties after temperature loading, the best was found to be the combination of carbon fibres in dosage of 0.75% by volume.

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“…Shale is a natural material of which the main component is mineral kaolinite. Various types of burnt clay found number of practical applications in Portland cement based composites [6,7].…”

Section: Experimental Programmentioning

confidence: 99%

Refractory Composites with Mineral Additive

Jogl

Reiterman

Holčapek

et al. 2015

MSF

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Present paper deals with experimental study of refractories manufactured with environmentally friendly materials. Performed research was focused on the development of new type of high temperature resistant composites with mineral addition applied as cement supplementary material. To reach suitable resistance to temperatures was chosen binder system based on aluminous cement which was modified by metashale. Developed composites went through the gradual thermal loading and residual mechanical and basic physical properties were investigated. Realized program confirmed good potential for practical utilization of metashale as an aluminous cement replacement. Present research offer an interesting way of reducing of costs and negative environmental impacts.

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Heating effects on physical and strength characteristics of fireclay from the Nigerian Coal Measures Formation

Cited by 7 publications

References 2 publications

Structural transformation of a kaolinite and calcite mixture to gehlenite and anorthite

Structural transformation of a kaolinite and calcite mixture to gehlenite and anorthite

Applicability of Carbon Fibres in Refractory Cement Composites

Refractory Composites with Mineral Additive

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