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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Optimization of Silica Fume, Fly Ash and Amorphous Nano-Silica in Superplasticized High-Performance Concrete
Author(s): M. Collepardi, S. Collepardi, U. Skarp, and R. Troli
Publication: Special Publication
Appears on pages(s): 495-506
Keywords: carbonation; chloride diffusion; fly ash; high-performance concrete; self-compacting concrete; silica fume; steam-curing; superplasticizer; ultra-fine amorphous colloidal silica
Abstract:The influence of some pozzolanic additions—such as silica fume, fly ash and ultra-fine amorphous colloidal silica (UFACS)—on the performance of superplasticized concrete was studied. Superplasticized mixtures in form of flowing (slump of 230 mm) or self-compacting concretes (slump flow of 735 mm) were manufactured all with a water-cement ratio as low as 0.44, in order to produce high-performance concretes (HPC). They were cured at room temperature (20°C) or steam-cured at 65°C in order to simulate the manufacturing of pre-cast members. Concretes with ternary combinations of silica fume (15-20 kg/m3), fly ash (30-40 kg/m3) and UFACS (5-8 kg/m3) perform better—in terms of strength and durability—than those with fly ash alone (60 kg/m3) and approximately as those with silica fume alone (60 kg/m3). Due to the reduced avail-ability of silica fume on the market, these ternary combinations can reduce by 60-70% the needed amount of silica fume for each pre-cast HPC element at a given performance level. Moreover, at later ages the strength reduction in steam-cured concretes with respect to the corresponding concretes cured at room temperature, is negligible or much lower in mixtures with the ternary combinations of pozzolanic additions.
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