Influence of different water types on the physical and mechanical properties of gypsum

Abstract Aim: To evaluate if gypsum mixed with different water types, with their different compositions influence the dimensional change, surface roughness and compressive strength of type IV and V gypsum specimens. Methods: Sixty specimens were fabricated from metal matrices and divided into six groups (n=10) according to the used type of gypsum and water: G1, G2 and G3 - type IV gypsum and tap, mineral and distilled water, respectively; G4, G5 and G6 - type V gypsum and tap, mineral and distilled water, respectively. Water/powder ratio followed the manufacturer's recommendations (19 mL/100 g) in all groups. The same specimens were used for all tests. A micrometer dial evaluated the dimensional change. The surface roughness of three random points was determined with a rugosimeter; a universal testing machine performed the compressive strength test. The data were subjected to analysis of variance (ANOVA). Results: There was no statistically significant difference (p>0.05) between the three types of water in the studied variables. There was statistically significant difference (p<0.05) between the gypsum mixes for the dimensional change variable. Conclusions: The different water types, with their different compositions, did not influence the analyzed physical and mechanical properties.

Bibliographic Details

Main Authors:	Proença,Juliana dos Santos, Suzuki,Marcos Massahiro, Costa,Silvano Cesar da, Hirata,Bruno Shindi, Lopes,Murilo Baena, Contreras,Edwin Fernando Ruiz
Format:	Digital revista
Language:	English
Published:	Faculdade de Odontologia de Piracicaba - UNICAMP 2015
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1677-32252015000300199
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