Chemical Properties of Refractories

Carniglia, S. C.

doi:10.1007/978-1-4684-3141-4_26

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…For the formulation of the SFRC compositions, eight size classes were obtained from Alcoa T60 tabular alumina ("-500", "-230", "-200+230", ..., "-8+16" mesh, as defined in Carniglia's notation [4]). Alcoa CT3000SG reactive alumina ("AR") was also used, as a commercial fine size class.…”

Section: Methodsmentioning

confidence: 99%

MPT Influence on the Rheological Behaviour of Self-Flow Refractory Castables

Silva

Segadães

Devezas

2008

MSF

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The success of a refractory castable is largely due to the quality of its properties and ease of application. Self-flow refractory castables (SFRC), with high flowability index (>130%), can be easily accommodated in a mould without the application of external energy, being ideal for the manufacture of monolithic linings. SFRC castables without cement require a matrix of very fine particles, which guarantees improved rheological behaviour and performs the role of the binder in the absence of the refractory cement. The presence of the aggregate (coarse particles) hinders the flowability index, but improves the castable mechanical strength and reduces firing shrinkage, and also contributes to the reduction of the castable costs. The control of the maximum paste thickness (MPT) allows the reduction of the coarse particles interference, minimizing the number of contact points among the grains and avoiding the formation of an aggregate skeleton that impairs the flowability of the mixture. In the present work, 100% alumina SFRCs without cement were produced with a fixed matrix of fine particles, whose particle size distribution was optimized using statistical techniques (mixtures design and triangular response surfaces). Different aggregate particle size distributions were used, with several MPT values, with the objective of evaluating which was the mean distance that maximized the flowability index, simultaneously ensuring good mechanical strength for the refractory castable. Ensuring a minimum surface area of 2.22m2/g, the mixtures reach the self-flow turning point with a minimum water content and the maximum flowability is obtained for an aggregate particle size distribution modulus of q=0.22, and consequently an optimized MPT value. SFRC with high mechanical strength (>60MPa) were obtained.

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Section: Methodsmentioning

confidence: 99%

MPT Influence on the Rheological Behaviour of Self-Flow Refractory Castables

Silva

Segadães

Devezas

2008

MSF

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“…For the formulation of the SFRC compositions, eight size classes were obtained from Alcoa T60 tabular alumina ("-500", "-230", "-200+230", ..., "-8+16" mesh, as defined in Carniglia's notation [10]). Alcoa CT3000SG reactive alumina ("AR") was also used, as a commercial fine size class.…”

Section: Methodsmentioning

confidence: 99%

Particle Distribution Design in a Self-Flow Alumina Refractory Castable without Cement

Silva

Segadães

Devezas

2006

Advances in Science and Technology

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A self-flow refractory castable (SFRC) without cement requires a matrix of fine particles and a broad size distribution of coarse particles (aggregate). The matrix ensures the rheological behaviour and performs the binding role of the absent refractory cement. The presence of the aggregate coarse particles hinders the flowability index (FI), but improves the castable mechanical strength and reduces firing shrinkage. A new methodology of SFRC particle distribution design was developed, using response surface statistical modelling and commercial alumina powders (reactive and tabular). First, the composition of the fine matrix was optimised, seeking minimum water content and maximum IF. To this matrix, various aggregate distributions, combining six tabular alumina size fractions and with different Andreasen distribution modulus, q, between 0.18 to 0.28, were added, to identify the composition with maximum FI. The results obtained show that a minimum specific surface area (SSA) of 2.22m2/g is necessary to reach the self-flow turning point, after which the largest FI requires the maximisation of the aggregate maximum paste thickness (MPT), corresponding to a distribution with q=0.22. The optimised castable composition presents high mechanical strength (>60MPa) and low shrinkage.

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Chemical Properties of Refractories

Cited by 2 publications

References 5 publications

MPT Influence on the Rheological Behaviour of Self-Flow Refractory Castables

MPT Influence on the Rheological Behaviour of Self-Flow Refractory Castables

Particle Distribution Design in a Self-Flow Alumina Refractory Castable without Cement

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