Banca de QUALIFICAÇÃO: FELIPE SERGIO BASTOS JORGE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : FELIPE SERGIO BASTOS JORGE
DATA : 13/07/2017
HORA: 14:00
LOCAL: Centro Federal de Educação Tecnológica de Minas Gerais
TÍTULO:

Effect of rice husk ash addition in interfacial transition zone between the matrix of cement-based composites and the steel fiber reinforcement.

PALAVRAS-CHAVES:

RHA, steel fiber, ITZ, bond strength

PÁGINAS: 70
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

Steel fibers are being widely used in concretes and other cement-based composites in order to improve their toughness properties. It’s known that concrete has high compressive strength and durability, but its tensile and flexural strength is low, especially when compared to steel. Studies indicate that in cement-based composites the Interfacial Transition Zone (ITZ) is where first cracks appear and their propagation lead to material failure. Mineral additions have been incorporated into cement matrixes with two main objectives: to give a sustainable destination to agroindustrial wastes such as rice husk ash (RHA) and to improve cement-based composites properties. The Rice Husks Ash (RHA), is being produced by burning for thermal energy generation, has high amorphous silica content, which is of high potential for pozzolanic activity. Therefore, RHA is considered as a new hydration product, containing mainly the C-S-H, producing higher density to cement matrix, reducing pores and voids, besides being sustainable material, since part of cement which is highly polluting material is replaced by RHA. The main objective of this research is to evaluate the improvement of bond strength between the steel fiber and cementitious matrix by partial replacing cement with RHA. For that, simple fiber pull-out tests and bending tests on composites reinforced with randomly distributed fibers were performed to assess adherence. It is intended to establish the relationship between the adhesion gain for single fiber and the results founded in bending tests. It is expected that RHA incorporation promoted ITZ densification, which caused an improvement in bond strength between the matrix and the steel fiber, indicating the use of that material can contribute to product more resistant steel fiber reinforced cement-based composites

MEMBROS DA BANCA:
Externo ao Programa - AUGUSTO CESAR DA SILVA BEZERRA
Presidente - CONRADO DE SOUZA RODRIGUES
Interno - FLAVIA SPITALE JACQUES POGGIALI