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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: Self-Compacting High-Performance Concretes
Author(s): Mario Collepardi, Roberto Troli, and Stefano Maringoni
Publication: Special Publication
Appears on pages(s): 1-7
Keywords: Crack-freedom. Drying shrinkage. Expansive agent. Self-compacting concrete. Shrinkage-reducing admixture. Superplasticizer.
Abstract:Self-compacting high-performance concretes have been manufactured by mixing natural aggregates, portland cement and ground limestone filler in the presence of a poly-carboxylate superplasticizer.
In some concrete mixtures a shrinkage-reducing admixture (SRA) was used to decrease the drying shrinkage by 30% with respect to the control mix without SRA when the specimens were kept at room temperature with a relative humidity (RH) permanently kept as low as 55%.
A special SCC was manufactured combining a CaO-based expansive agent with SRA and the restrained expansion was measured in the absence of any wet curing in very dry environment (RH = 50%). After 2-3 months the restrained expansion was lost but no crack was recorded although the RH was very low.
Similar results were obtained by using a combination of PVA macrofibres with SRA: no reduction in drying shrinkage was recorded in the PVA-SRA concrete with respect to the SRA concrete. However, in the presence of PVA both the number and the thickness of the cracks were significantly reduced. The combined uses of SRA with the expansive agent or the macrofibres make more reliable concretes from the durability point of view because of the absence of cracks.
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