Mechanical and durability properties of recycled aggregate concrete with ternary binder system and optimized mix proportion
Cargando...
Archivos
Fecha
2020
Autores
Babalola, O. E.
Awoyera, P. O.
Tran, M. T.
Le, D-H
Olalusi, O. B.
Viloria, A.
Ovallos-Gazabon, D.
Título de la revista
ISSN de la revista
Título del volumen
Editor
Elsevier
Resumen
This study aimed to investigate the mechanical and durability properties of recycled aggregate
concrete with a ternary binder system and optimized mix proportion. Two concrete batches were
developed using a densified mix design approach (DMDA) to evaluate the required mix
proportions. Batch I have GGBS content varied at 0%, 10%, 20%, 30%, 40% and 50% at constant
w/b ratio of 0.45, while batch II concrete mix have varied water/binder ratios: 0.3, 0.35, 0.4, 0.45
and 0.5 at constant GGBS replacement level of 30%. The fine aggregate (river sand) of the two
batches was blended with fly ash at optimum loose packing density (FA + Sand) and
superplasticizer (SP) was incorporated in the mix at a constant level of 1.4%. A control mix,
comprising of natural aggregate was also developed. The results obtained showcased the feasibility
of producing structural concrete with recycled aggregates using GGBS and fly ash. The
mechanical and durability properties were best at 30% GGBS content and 0.35 water/binder ratio.
The DMDA for mix proportion adopted for RAC contributed significantly to improving its
properties when compared to NAC, especially at the optimum observed RAC mix with
compressive strength of 52 MPa. Also, the mix demonstrated good permeability resistance in terms
of chloride-ion ingress and capillary water absorption.
Descripción
Palabras clave
Recycled aggregate concrete, Densified mix design, Ternary binder, Durability, Mechanical properties
