Evaluation of Dehydration Temperature on Properties of Recycled Gypsum Plaster

Gypsum plaster is a material used as internal covering of walls in Brazilian constructions. However, this material has short setting times and generates a great quantity of material loss. The low energy necessary to dehydrate the waste material for utilization becomes recycling methods viable, since...

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Bibliographic Details
Published in:Key Engineering Materials 2015-10, Vol.668, p.275-282
Main Authors: Moraes Pereira, Valdir, Camarini, Gladis
Format: Article
Language:English
Subjects:
Admixtures
Compressive strength
Dehydration
Gypsum plaster
Recycled
Setting (hardening)
Superplasticizers
Utilization
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Summary:Gypsum plaster is a material used as internal covering of walls in Brazilian constructions. However, this material has short setting times and generates a great quantity of material loss. The low energy necessary to dehydrate the waste material for utilization becomes recycling methods viable, since the recycled products have the same properties of the commercial material. This paper aims to evaluate the behavior of recycled gypsum plaster calcined at 100 °C, 150 °C and 200 °C. It was also studied the use an admixture (superplasticizer). Physical and mechanical properties were evaluated. The results showed that the dehydration temperature influences in both fresh and hardened gypsum properties. The temperature of 200 °C reported better values of initial and final setting times and compressive strength. Calcination at 150 °C showed higher values of hardness. The admixture utilization modified the initial and final setting times.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.668.275