Use of steel slag and LAS-based modifying admixture in obtaining highly eco-efficient precast concrete products.
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2023
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This paper presents a study on improving the eco-efficiency of no-slump concrete for precast
elements using Basic Oxygen Furnace Slag (BOFS). Recycled BOFS powders and aggregates have
been produced to obtain mixtures with better particle size distribution and improved packing
density based on a particle packing method. A comprehensive experimental investigation was
carried out on mixtures with different cement contents (5%, 10%, and 15% vol.) and compaction
energy levels (6, 10, and 20 blows in a sand rammer). A modifying admixture based on Linear
Alkyl Benzene Sodium Sulfonate (LAS) has also been evaluated as a workability and cohesiveness
enhancer for steel slag concretes. In addition, concrete eco-efficiency was evaluated by measuring
the binder intensity (bi) and waste consumption. The highest compaction energy provided
packing densities ranging from 0.78 to 0.80, and BOFS aggregates led to better mechanical
performances. The BOFS concrete containing 15% cement obtained the best strength (52.1 MPa)
and bi value (7.0 kg/m3
/MPa), with a waste consumption of 2356.57 kg/m3
. The mixture with
the lowest cement consumption (5% - 121.56 kg/m3
) and the highest consumption of waste
(2637.82 kg/m3
) reached 16 MPa, delivering a bi of 7.6 kg/m3
/MPa.
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Eco-efficiency, No-slump concrete, Particle packing, Basic Oxygen Furnace Slag - BOFS, Linear Alkyl Benzene Sodium Sulfonate - LAS
Citação
MARTINS, A. C. P. et al. Use of steel slag and LAS-based modifying admixture in obtaining highly eco-efficient precast concrete products. Journal of Building Engineering, v. 66, artigo 105884, maio 2023. Disponível em: <https://www.sciencedirect.com/science/article/pii/S2352710223000633>. Acesso em: 15 mar. 2023.