Banca de DEFESA: ANDRESA DE FREITAS SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRESA DE FREITAS SILVA
DATE: 05/03/2024
TIME: 14:30
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

PRODUCTION OF INJECTION GROUT WITH PARTIAL REPLACEMENT OF CEMENT WITH CHITOSAN: RESISTANCE TO AXIAL COMPRESSION AND MICROSTRUCTURAL ANALYSIS

KEY WORDS:

Alternatives to Portland cement, sustainable materials, chitosan, Portland cement composites, injection mortar.

PAGES: 179
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Chitosan is a biopolymer derived from the deacetylation of chitin, which is the most abundant component in the shells (exoskeletons) of shrimps, crabs, and other crustaceans. It can also be obtained from insects, fungi, bacteria, and yeast. Chitosan is the second most abundant natural polysaccharide on Earth, after cellulose. This study addresses the use of chitosan in partially replacing Portland cement in injection mortar. All tests were conducted in accordance with current technical standards. Thus, this work analyzes the influence of chitosan on the compressive strength and microstructure of the injection mortar. To do so, a chitosan replacement percentage of 0.1% was established based on literature and preliminary results from our group. The mixture for the prepared samples was determined, and then the mortars were produced. The specimens were assembled next. With the mortars still unset, flow and working life tests were performed. Subsequently, with the hardened specimens, axial compressive strength tests and microstructural analyses (XRF; SEM/EDS; XRD; and FTIR) were carried out. The obtained results demonstrated that chitosan, at the relative concentration used, is capable of partially replacing cement in injection mortars without compromising the compressive strength and complying with current technical standards. Thus, the partial replacement of cement with chitosan in injection mortars, even in low proportions, emerges as a promising alternative in the development of sustainable construction materials.

COMMITTEE MEMBERS:
Externa ao Programa - 1066974 - ANALICE FRANCA LIMA AMORIM - nullExterno à Instituição - OLAVO DHYAN DE FARIAS CARDOZO - UFPE
Presidente - 3199308 - PATRICIA MARIA ALBUQUERQUE DE FARIAS