Banca de DEFESA: Evelyn Moraes Hosken de Sá

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Evelyn Moraes Hosken de Sá
DATE: 20/10/2021
TIME: 14:00
LOCAL: https://conferenciaweb.rnp.br/webconf/evelyn-moraes-hosken-de-sa
TITLE:

ASSESSMENT OF THE MECHANICAL AND DURABILITY PERFORMANCE OF ALKALI-ACTIVATED MORTARS BASED ON STEEL SLAG

KEY WORDS:

steel slag; alkali-activated; mechanical properties; durability.

PAGES: 56
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

Alkali-activated materials have been promoted as a more sustainable alternative to Portland cements. Among its advantages is the possibility of being produced with industrial waste materials, such as steel slag. This study aims to evaluate the behavior of steel slag as aggregate and / or binder in matrices of alkali-activated materials from the point of view of mechanical properties and durability. To evaluate its behavior as an aggregate will be made 16 formulations with constant matrix changing the type of aggregate (100% natural aggregate, 100% blast furnace slag, 100% steel slag and 60% blast furnace slag and 40% steel slag) and the aggregate binder ratio. In this first stage consistency (flow table), compressive strength (7 and 28 days), water absorption, bulk density and porosity will be evaluated, and the best aggregate binder ratio will be selected to be studied in the next step. To evaluate the behavior of steel slag as binder, 16 formulations will be done changing the content of steel slag (0%, 33%, 66% and 100%) in binder and type of aggregate. In this second stage compressive strength (1, 7 and 28 days), water absorption, bulk density and porosity, linear expansion (90, 180 and 360 days) and efflorescence will be evaluated. The preliminary results of the first stage indicate that the mortars formulated with an aggregate / binder ratio in the intermediate range (between 1.0 and 1.7 in volume) showed the best consistency, compressive strength between 30 MPa and 40 MPa and satisfactory porosity. With lower aggregate / binder ratios the mortars showed very fluid consistency and high porosity and with higher aggregate / binder ratios the mortars showed very dry consistency and less compressive strength. Based on this and considering the similar behavior for all types of aggregate, 1.3 (by volume) was defined as the ideal aggregate / binder ratio to be used in the second stage. It is hoped that this work can contribute to the use of steel slag in construction industry, reducing the environmental impact and presenting a new route of use in alkali-activated materials.

BANKING MEMBERS:
Presidente - PAULO HENRIQUE RIBEIRO BORGES
Interno - CONRADO DE SOUZA RODRIGUES
Externo à Instituição - TÚLIO HALLAK PANZERA - UFSJ