Banca de DEFESA: Divino Gabriel Lima Pinheiro

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Divino Gabriel Lima Pinheiro
DATE: 28/07/2023
TIME: 10:00
LOCAL: PECC
TITLE:

TERNARY MIXTURE OF PORTLAND CEMENT, CALCINED CLAY AND NANOSILIC FOR CEMENT COMPOSITES

KEY WORDS:

SCM, Nanosilica; Calcined Clay; Inert filler.

PAGES: 142
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

One of the most used materials in the world is Portland cement. In this way, it is natural to invest more and more in researching new materials that, when added to cement, will give it other properties and/or reduce operating costs. Among these materials there is calcined clay, a pozzolanic mineral addition that gives the cement, among other improvements, less heat of hydration and lower production cost. Another material that should be mentioned is nanosilica, considered a highly reactive addition, currently applied to cementitious materials with unique behavior due to its reduced size. These materials provide substantial improvements to cementitious materials, however, the effects caused by nanosilica associated with calcined clay are still poorly studied. Thus, this work deals with the experimental investigation of the effect of the addition of nanosilica, individually and together with two types of calcined clay, in Portland cement pastes, aiming to contribute to the study of nanotechnology applied to cementitious materials. The experimental program is divided into four parts: (1) Production of calcined clay, using controlled temperature in a muffle furnace; (2) Characterization of the materials studied in the research; (3) Determination of the performance index of binary and ternary mixtures, with Portland cement, nanosilica, inert filler and calcined clays; (4) Study of the microstructure of Portland cement, nanosilica, inert filler and calcined clay pastes. Microstructural analysis techniques will be used for this study: x-ray fluorescence, x-ray diffraction, calorimetry, thermal analysis (TG/DTG), scanning electron microscopy, infrared spectroscopy, mercury intrusion porosimetry and nuclear magnetic resonance. It is expected that the results demonstrate the potential to use these additions for the production of high strength concretes, as a synergistic effect is observed in binary and ternary mixtures.

COMMITTEE MEMBERS:
Presidente - 1734221 - JOAO HENRIQUE DA SILVA REGO
Interno - 404321 - ELTON BAUER
Externo à Instituição - JORGE IVÁN TOBÓN - UNC
Externo à Instituição - Francisco Gabriel Santos Silva - UFBA