Banca de DEFESA: JOÃO RICARDO PEREIRA DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOÃO RICARDO PEREIRA DA SILVA
DATE: 11/05/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

CEMENTARY COMPOSITES OF CHITOSAN AND PORTLAND CEMENT: PRODUCTION, ANALYSIS OF STRUCTURAL INTERACTIONS AND PROPERTIES OF INTEREST IN CIVIL CONSTRUCTION

KEY WORDS:

Cementitious composite. Chitosan. Macrostructural Properties. Microstructure properties. Durability. 

PAGES: 102
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Civil construction plays an important role in energy consumption worldwide and significantly influences the total consumption of natural resources and CO2 emissions. The use of renewable materials is intrinsically related to research and innovation. Reuse, recycling, as well as the development of new materials and the discovery of new applications for already known renewable materials, can significantly contribute to sustainable development. Chitosan (CS) is a biopolymer with a unique chemical structure and characteristics, combined with its abundant availability as a derivative of chitin, which means that its application possibilities in the most different technological fields have expanded considerably. In the present work, the use of chitosan for the production of cementitious composites is presented and discussed. The influence of chitosan incorporated in the composites through optimal levels was evaluated. The chitosan contents incorporated in the dosage were 0.1%; 0.3% and 0.4%, in relation to the cement mass. Also in concrete and mortar, compressive strength and consistency tests were carried out. The microstructures were examined using scanning electron microscopy (SEM), X-ray fluorescence (FRX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and TG/DSC. As a result, CS powder not only has a physical effect on cement hydration, but also has a chemical effect influencing the amount and type of hydrates formed. Also, relationships between chemically bound water, influence of supplementary cementitious material on cement hydration and durability are presented. No adverse effect was observed on the microstructural behavior of the composites due to the replacement of cement by CS powder. The results were favorable to the incorporation of chitosan (up to 0.4% substitution), being positive in terms of mechanical properties and durability for most of the techniques used, which strongly indicates that chitosan can be considered as a promising material to be incorporated in the production of concret.

COMMITTEE MEMBERS:
Interna - 2572606 - GLORIA MARIA VINHAS
Presidente - 3199308 - PATRICIA MARIA ALBUQUERQUE DE FARIAS
Externo ao Programa - 1128124 - ROMILDE ALMEIDA DE OLIVEIRA - UFPEInterna - 1283002 - YEDA MEDEIROS BASTOS DE ALMEIDA
Externa à Instituição - YÊDA VIEIRA PÓVOAS - UPE