Banca de DEFESA: RAFAELA OLIVEIRA HOLANDA DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAFAELA OLIVEIRA HOLANDA DA SILVA
DATE: 24/08/2023
TIME: 14:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

DEVELOPMENT OF GLUE MORTAR WITH ADDITION OF CHITOSAN: PRODUCTION, MICROSTRUCTURE AND STRENGTH OF ADHESION TO TENSION

KEY WORDS:

Cementitious composites. Sticky mortar. Portland cement. Chitosan. Adhesion resistance. Sustainability.

PAGES: 106
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

The development of sustainable cementitious composites is urgent and urgent, mainly due to the production of Portland cement, which is responsible for up to 7% of global CO2 emissions, one of the main gases that generate the greenhouse effect. Thus, the search for sustainable materials that can provide good performance as partial or complete substitutes for cement is a topic of growing interest and importance. Daily large amounts of shells (exoskeletons) of crustaceans are discarded in the environment. However, these shells contain chitin, the most abundant biopolymer on Earth after cellulose. Through the deacetylation of chitin, chitosan is obtained, which in the present work is used as a partial substitute for Portland cement in adhesive mortars. The viability of such a replacement is evaluated here through the microstructural study and the tensile adhesion strength property. For this, four modified adhesive mortars with different levels of powdered chitosan (0%, 0.1%, 0.3% and 0.4%) were produced to replace the cement mass. These mixtures were applied to standard substrates and added to 10 ceramic plates for each sample. The results indicate that the partial replacement of cement by chitosan, in the production of adhesive mortar, is feasible for additions of up to 0.3%. New cementitious composites with the addition of chitosan as a partial substitute for Portland cement, even in low concentrations, have the potential to bring greater sustainability to the production of materials for civil construction.

COMMITTEE MEMBERS:
Externa à Instituição - ELIANA CRISTINA BARRETO MONTEIRO - UPE
Presidente - 3199308 - PATRICIA MARIA ALBUQUERQUE DE FARIAS
Interna - 1283002 - YEDA MEDEIROS BASTOS DE ALMEIDA