Banca de DEFESA: JULIANA SAMPAIO ÁLVARES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JULIANA SAMPAIO ÁLVARES
DATA : 10/05/2019
HORA: 14:00
LOCAL: PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA CIVIL
TÍTULO:
PALAVRAS-CHAVES:

Alkaline activation.Structural repair. Durability.

PÁGINAS: 244
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

The durability of buildings is a subject of great interest to the construction industry. Avoiding the appearance of pathological manifestations, developing and improving maintenance methodologies, mainly in structural elements, is one of its main challenges. In Brazil, the most used corrective intervention technique is the localized repair with Portland cement mortar modified with polymers and gratings. One of the main problems of these materials is the lack of effective knowledge of their durability over time. In view of the above, it is necessary to advance studies that seek alternative materials for use as repair material, offering good durability and performance against aggressive agents of the environment. In this context, alkali activated materials appear as an alternative to organic polymers and with potential to be applied as repair material. The objective of this work is to develop a mortar based on metakaolin activated with sodium silicate and evaluate its durability for use as a repair material. For this, the physical-mineralogical characterization of the materials and then the traces of 3 alkali-activated slides were performed, varying only the molar ratio between H₂O/Na₂O (10; 12 and 14). The behavior of these alkaline activated sludges, when submitted to environmental cure (CA) and oven cure (CE), at a constant temperature of 55 °C during the first 24 hours after molding, was also evaluated. Then, the mechanical and durability behavior of these 3 alkali activated pulps was evaluated to determine which pulp would be suitable for use in the production of alkali activated mortar for use as repair material. With the molar pulp ratio of 10, presenting the best results in relation to the mechanical behavior and durability evaluated. Finally, mortars activated with alkali (AAA) of molar ratio, between H₂O/Na₂O equal to 10, were evaluated and their mechanical and mechanical strength were evaluated in the CA and CE conditions. It was also evaluated the behavior of these samples in extreme situations, such as in fire situations and attacks on aggressive solutions. It was concluded that AAA submitted to CE presented superior mechanical resistance to mortars submitted to CA. Regarding durability, the studied AAA showed good performance to be used as repair material.

MEMBROS DA BANCA:
Presidente - 2618348 - DAYANA BASTOS COSTA
Externo à Instituição - EDUARDO LUIS ISATTO
Interno - 1142694 - EMERSON DE ANDRADE MARQUES FERREIRA