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Mechanisms to improve the strength development in calcium aluminate cement bonded high alumina castables
Decreasing the de-moulding time of refractory castables can have a significant impact on the overall cost/performance ratio. This is especially true during winter where low ambient temperatures provoke a retarded strength development which can have a negative impact on costs and performance. The mechanisms to improve the strength development in CAC bonded high alumina castables has been shown in this presentation through three formulation examples. Different accelerating additives have been tested in combination with two different CAC. Li-carbonate can be identified as one of the most effective accelerators for CAC bonded high alumina castables. A good compromise between fluidity during the installation period and a rapid strength formation can be achieved. At 5 deg C the mix with Li2CO3 creates early strength which can be even higher than for the mix without Li2CO3 at 20 deg C. The de-moulding time can be reduced to a few hours, even at low ambient temperatures of 5 deg C. With quantities of up to 0,05% Lithium carbonate the permeability of the castable AM6 doesn't change significantly, compared to the system without Lithium carbonate so that there is no impact on either the dry-out time or dry-out safety. The addition of polypropylene fibres increases the permeability and the dry-out can be done more safely.
Mechanisms to improve the strength development in calcium aluminate cement bonded high alumina castables
Decreasing the de-moulding time of refractory castables can have a significant impact on the overall cost/performance ratio. This is especially true during winter where low ambient temperatures provoke a retarded strength development which can have a negative impact on costs and performance. The mechanisms to improve the strength development in CAC bonded high alumina castables has been shown in this presentation through three formulation examples. Different accelerating additives have been tested in combination with two different CAC. Li-carbonate can be identified as one of the most effective accelerators for CAC bonded high alumina castables. A good compromise between fluidity during the installation period and a rapid strength formation can be achieved. At 5 deg C the mix with Li2CO3 creates early strength which can be even higher than for the mix without Li2CO3 at 20 deg C. The de-moulding time can be reduced to a few hours, even at low ambient temperatures of 5 deg C. With quantities of up to 0,05% Lithium carbonate the permeability of the castable AM6 doesn't change significantly, compared to the system without Lithium carbonate so that there is no impact on either the dry-out time or dry-out safety. The addition of polypropylene fibres increases the permeability and the dry-out can be done more safely.
Mechanisms to improve the strength development in calcium aluminate cement bonded high alumina castables
Wöhrmeyer, Christopher (author) / Valdelievre, Benoit (author) / Simonin, Fabien (author) / Parr, Chris (author)
2003
4 Seiten, 11 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
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