Banca de DEFESA: JULIANA SOFIA FONSECA CAMARGOS
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : JULIANA SOFIA FONSECA CAMARGOS
DATE: 25/04/2024
TIME: 13:30
LOCAL: Belo Horizonte (remoto)
TITLE:
Development of alkali-activated foams based on blast furnace and steel slag
KEY WORDS:
Foamed alkali-activated materials, hydrogen peroxide, aluminum powder, thermal curing, surfactant
PAGES: 103
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:
Alkali-activated foams (AAF) combine the benefits of foamed structures and alkali- activated matrices. The goal of this work is to study the influence of the binder, the type and percentage of different foaming agents, the curing regime, and the use of surfactants on the physical and mechanical properties of alkali activated foams. Blast furnace slag (BFS) and steel slag (SS) were used as binder. Hydrogen peroxide (H2O2) and aluminum powder (Al) were chosen as foaming agents, Matchen AE11 and sodium dodecyl sulfate (SDS) were employed as surfactant. The results confirm that AAF could successfully be produced using BFS and BFS/SS (46.89 MPa and 29.02 MPa), but the use of SS resulted in lower compressive strength. Lower values of density were obtained when higher quantity of Matchen AE11 were used. The use of H2O2 and aluminum powder reduced the compressive strength and the density of AAF for both curing regimes. However, among the tested percentages, increasing the quantity of foaming agent did not result in statistical reduction of compressive strength. Thermal curing promoted higher compressive strength at early curing age but lower compressive strength after 28 days. The addition of SDS contributed to the increase of more than 4 times in the porosity of the reference formulation. In addition, formulations produced combining foaming agent and SDS presented higher porosity and even lower compressive strength and densities, when comparing to the same formulations without surfactant. To illustrate, formulations produced using 1% H2O2 and 0.05% Al cured at room temperature presented, 9.78 MPa and 10.64 MPa of 28-day compressive strength and of density 1.47 g/cm3 and 1.37 g/cm3, respectively.
COMMITTEE MEMBERS:
Presidente - PAULO HENRIQUE RIBEIRO BORGES
Interna - FLAVIA SPITALE JACQUES POGGIALI
Externo à Instituição - WHITE JOSÉ DOS SANTOS - UFMG