THE INFLUENCE OF A SUPERPLASTICIZER ON RECYCLED GYPSUM PLASTER PROPERTIES

Author(s): Sayonara Maria de Moraes Pinheiro, Gládis Camarini
Book Title: III Progress of Recycling in the Built Environment
Editor: I. Martins, C. Ulsen and S. C. Angulo
e-ISBN: 978-2-35158-158-2
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 95-100
Total Pages: 6
Language: English

Abstract: The gypsum plaster waste is generated during the components production and building construction processes. This material should be recycled to avoid the contamination of soil and groundwater. The reactions reversibility enables the recycling of the material by a simple recycling process which produced a recycled gypsum plaster. However, the recycled gypsum has shown a reduction in workability. This waste material needs to ensure the workability to be applied to components production. In this way, this study analyses the influence of using a superplasticizer on the properties of recycled gypsum plaster. The properties were evaluated in fresh (consistency and setting times) and in hardened state (compressive strength, air permeability and microstructure). Results show better workability with the superplasticizer content, but the strength diminished significantly. The setting times were increased with increasing the admixture content and the microstructure showed the formation of large dihydrate crystal during recycled gypsum plaster hydration.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00