RT info:eu-repo/semantics/article
T1 Temporal flowability evolution of slag-based self-compacting concrete with recycled concrete aggregate
A1 Revilla Cuesta, Víctor
A1 Skaf Revenga, Marta
A1 Santamaría, Amaia
A1 Hernández Bagaces, Jorge J.
A1 Ortega López, Vanesa
K1 Self-compacting concrete
K1 Recycled concrete aggregate
K1 Ground granulated blast furnace slag
K1 Flowability, viscosity and passing ability evolution
K1 Sieve segregation
K1 Air content
K1 Materiales de construcción
K1 Building materials
K1 Ingeniería civil
K1 Civil engineering
AB The addition of by-products, such as recycled concrete aggregate and ground granulated blast furnace slag, modify the in-fresh flowability of ordinary self-compacting concrete both initially and over time. A detailed study is presented in this paper of 18 mixtures (SF3 slump-flow class) containing 100% coarse recycled concrete aggregate, two types of cement (CEM I or CEM III/A, the latter with 45% ground granulated blast furnace slag), different contents of fine recycled concrete aggregate (0, 50, or 100%), and three different aggregate powders (ultra-fine limestone powder <0.063 mm, limestone fines 0/0.5 mm, and recycled concrete aggregate 0/0.5 mm). The temporal evolution of slump flow, viscosity, and passing ability, and the values of segregation resistance, air content, fresh and hardened density, and compressive strength were evaluated in all the mixtures. The addition of fine recycled concrete aggregate and CEM III/A improved initial slump flow and passing ability by 6%, due to their higher proportion of fines. Nevertheless, the temporal loss of flowability within 60 min was 5.8% lower when adding natural aggregate and CEM I. Viscosity and air content increased 26% on average following additions of fine recycled concrete aggregate, unlike with additions of ground granulated blast furnace slag. Flowability and strength increased with the addition of limestone fines 0/0.5 mm. According to multi-criteria analyses, the mixtures with CEM III/A, 50% fine recycled concrete aggregate, and limestone fines 0/0.5 mm showed an optimal balance between their flowability (SF2 slump-flow class 60 min after the mixing process), compressive strengths (around 60 MPa), and carbon footprints.
PB Elsevier
SN 0959-6526
YR 2021
FD 2021-05
LK http://hdl.handle.net/10259/6174
UL http://hdl.handle.net/10259/6174
LA eng
NO Spanish Ministry MCIU, AEI and ERDF [grant numbers FPU17/03374 and RTI 2018-097079-B-C31]; the Junta de Castilla y León (Regional Government) and ERDF [grant number UIC-231, BU119P17]; the Youth Employment Initiative (JCyL) and ESF [grant number UBU05B_1274]; the University of Burgos [grant number SUCONS, Y135. GI], UPV/EHU (PPGA20/26) and, finally, our thanks also to the Basque Government research group IT1314-19.
DS Repositorio Institucional de la Universidad de Burgos
RD 22-nov-2024