Banca de QUALIFICAÇÃO: MARCO AURÉLIO DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MARCO AURÉLIO DA SILVA
DATE: 28/08/2023
TIME: 14:00
LOCAL: Belo Horizonte
TITLE:

Use of quartzite powder waste as a mineral addition in high strenght concrete

KEY WORDS:

mineral admixture, high strength concrete, quartzite powder, silica fume, alkali-aggregate reaction, alkali-silica reaction

PAGES: 71
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

The use of cement tends to increase considerably over the years in Brazil and worldwide, due to the increased demand for concrete. The increase in consumption has a direct impact on the environment, as civil construction is responsible for 38% of CO₂ emissions, with the cement industry alone accounting for 5% to 8% of emissions. In this way, the importance of researches aimed at the reuse of materials grows, which can occur through mineral additions, partial replacement of cement or through the use of waste as a form of aggregates. In this sense, this research aims at the use of quartzite and silica fume residues as mineral additions in high strength concrete (HC). For the use of quartzite residues and silica fume as a mineral addition, it is intended to study, mainly, the packing of particles, using the software Elkem Materials Mixture Analyzer (EMMA), aiming to generate the best granulometric curve and provide the reduction of the porosity of the concrete and increased compressive strength. The influence of mineral additions composed of quartzite and silica fume residues will also be verified on the tensile strength of concrete in bending and its reactions with cement (alkali-aggregate reaction – AAR and alkali-silica reactivity). Thus, in order to carry out studies on the reuse of quartzite residue in concrete, tests of granulometric composition and specific mass of quartzite powder will be carried out. Then, cylindrical concrete specimens will be molded to verify the axial compressive strength and modulus of elasticity. Specimens will be elaborated for tests of tensile strength in bending. Finally, mortar bars will be executed in order to verify the expansion of the concrete and the possible alkali-aggregate reaction. Special attention will be given to particle packing and the presence of deleterious quartz in the reuse of quartzite residues. As a result of this research, it is expected to verify the possibility of using quartzite powder and silica fume in high strength concrete (55 to 100 MPa), with quartzite powder as a partial substitute for conventional sand and silica fume as a partial substitute for Portland cement.

COMMITTEE MEMBERS:
Presidente - FLAVIA SPITALE JACQUES POGGIALI
Interno - PETER LUDVIG
Externo à Instituição - RICARDO ANDRE FIOROTTI PEIXOTO - UFOP