Banca de DEFESA: NILSON SANTANA DE AMORIM JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : NILSON SANTANA DE AMORIM JÚNIOR
DATA : 14/02/2020
HORA: 09:00
LOCAL: PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA CIVIL
TÍTULO:

ASSESSMENT OF THE DURABILITY OF GEOPOLIMERIC CONCRETE OBTAINED FROM METACAULIM

PALAVRAS-CHAVES:

Geopolymer, Durability, Freeze-thaw, Electrical resistivity, Corrosion potential, AAR, EIS, Chloride Migration, Carbonation.

PÁGINAS: 153
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

Research on the produce of alternative cements with lower environmental impact (zero clinker) has been gaining increasing interest, mainly by emitting lower amounts of CO₂ into their production. These binders, denominate geopolymers, are got from the alkaline activation of materials rich in SiO₂ and Al₂O₃, and may derive from by-products/industrial waste, thus being binders with low environmental impact. However, few studies addressing the durability of this binder have been developed, leaving a gap regarding the evaluation of the service life and potential of Portland cement replacement. Thus, the present research aims to estimate the durability of concretes containing geopolymeric binders through tests that measure the performance of chlorides, such as chloride migration tests, corrosion potential, electrical resistivity and electrochemical impedance spectroscopy (EIS), besides its behavior regarding freeze-thaw cycles, alkali-aggregate reaction (AAR) and carbonation. The materials used for the production of geopolymeric concretes were metakaolin, alternative sodium silicate, water, sodium hydroxide, besides fine and coarse aggregates and, for comparison, it was cast concrete with Portland cement of the same strength class, beyond a third geopolymer mixture with the same water/dry material ratio as conventional concrete. Results show that geopolymers have an equivalent or even greater durability to Portland cement concrete, making its large-scale use reliable and contributing to the reduction of environmental impacts associated with cement production and its use in civil construction.

MEMBROS DA BANCA:
Interno - 2137887 - CLEBER MARCOS RIBEIRO DIAS
Presidente - 1779028 - DANIEL VERAS RIBEIRO
Interno - 2315713 - MARCELO STROZI CILLA
Externo à Instituição - PAULO HENRIQUE RIBEIRO BORGES