Banca de QUALIFICAÇÃO: VITOR ALENCAR NUNES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : VITOR ALENCAR NUNES
DATA : 06/07/2017
HORA: 14:00
LOCAL: Centro Federal de Educação Tecnológica de Minas Gerais
TÍTULO:

COMPATIBILITY AND ADHESION BETWEEN FIBER-REINFORCED ALKALI-ACTIVATED REPAIR MORTAR AND CONCRETE SUBSTRATE.


PALAVRAS-CHAVES:

Alkali-activated materials, repair mortar, structural repair, adhesion, fiber-reinforced composite.


PÁGINAS: 65
RESUMO:

Concrete repair is a complex task requiring a special knowledge involving technical building regulations and standards, several construction materials, deterioration mechanism, diagnosis, repair principles and methods, repair materials, execution of repair works, inspections, monitoring and maintenance. So far, most used patch
repair mortars fall into two categories, the mortars based on inorganic binders (Portland cement) and those based on organic binders (epoxy resin). But, recent investigations reveal a third category of mortars with high potential to be used in the field of concrete repair, the alkali-activated based mortars. Alkali-activated materials (AAM) have been widely discussed, studied and promoted as a greener binder of a sustainable future for the construction materials industry. These binders can be generated from a wide range of aluminosilicate (called as “precursor”) under alkaline conditions (induced by the “alkali activator”) to produce a hardened component.
Therefore, this study aims to evaluate the compatibility and the adhesion between a fiber-reinforced alkaliactivated mortar and a concrete substrate. Were studied twenty one different formulations of metakaolin (MK) and blast furnace slag (BFS) based and mixed mortars to evaluate theirs mechanical properties and the
relationship behaviour between the compressive strength and the modulus of elasticity of alkali-activated materials. After this evaluation five formulations were selected among the rest to produce the repair mortar and apply to the concrete substrate. A preliminary volume fraction of 0.25% of PP fiber was used to mitigate the early-age shrinkage and to increase the adhesion bond of the repair mortar with the concrete substrate. The bond strength was evaluated by pull-off test. Further adhesion investigations are proposed: slant shear test and crack trapping mechanism by four point bending. Durability properties investigations are also proposed for the repair mortars: permeability, capillarity, water absorption, apparent porosity and density, mercury intrusion porosimetry and resistance to chlorides. Preliminary results showed that 0.25% of PP fiber is not enough to solve the shrinkage problem thus, affecting the adhesion properties.


MEMBROS DA BANCA:
Externo à Instituição - JOSÉ MÁRCIO FONSECA CALIXTO - UFMG
Presidente - PAULO HENRIQUE RIBEIRO BORGES
Interno - PETER LUDVIG
Notícia cadastrada em: 09/06/2017 12:17
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