Banca de DEFESA: FERNANDA CAVALCANTI FERREIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : FERNANDA CAVALCANTI FERREIRA
DATE: 25/11/2021
TIME: 09:00
LOCAL: Auditório Programa de Pós-Graduação em Engenharia Civil (on line)
TITLE:

CONTRIBUTION TO THE STUDY OF THE BONDING MECHANISM OF GYPSUM PLASTER PASTE APPLIED ON POROUS SUBSTRATES

KEY WORDS:

Hemidrate. Gypsum plaster. Gypsum plaster paste. Bonding mechanism.

PAGES: 330
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The gypsum plaster has been gaining in construction. However, the literature on the bond of gypsum plaster paste systems is limited to small experimental investigations and the phenomenon of bond of the substrate-coating interface and its influential factors is not defined. In addition, NBR 13867 (1997), NBR 16618 (2017) and NBR 16689 (2019), aimed at internal plaster coating, present gaps in relation to the procedure for the execution of plaster coatings. Thus, the objective of this research is to contribute to the study of factors involved in bond and to the understanding of the bonding mechanism of coating systems executed in gypsum plaster paste on different porous substrates, evaluating the nature of the bond, through the conciliation of investigations at the microscopic and macroscopic level, with physical, chemical, mechanical and morphological characterization of the substrates, plaster pastes and paste- substrate interface, such as bond strength tests, analysis of coating systems interfaces through a magnifying glass, scanning electron microscope and petrographic analysis. The influence on bond of variables such as water/binder ratio (0.6, 0.8 and 1.0), base treatments (with or without pre-wetting, with and without roughcast) and types of bases (ceramic and concrete blocks, and concrete) was evaluated. With the analysis of the results, it is verified that the water/binder ratio, the type of base and the pre-treatment influence the bond strength.Thus, the objective of this research is to understand the bond mechanism of plaster coating systems and its intervening factors. The bond extension of the coatings is approximately 100%, regardless of the combined factors. As for the microstructure of the interface of the analyzed systems, based on the investigation carried out, the bond is predominantly mechanical, related to roughness.

BANKING MEMBERS:
Externa à Instituição - MARIA DO ROSÁRIO DA SILVA VEIGA
Presidente - 1152919 - ARNALDO MANOEL PEREIRA CARNEIRO
Externa à Instituição - KAROLINE ALVES DE MELO MORAES - UFAL
Externo à Instituição - VALDECIR ANGELO QUARCIONI - IPT-SP
Externa à Instituição - YÊDA VIEIRA PÓVOAS TAVARES - UPE