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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: Development of Concrete with High Early-Stage Strength
Author(s): J. Ambroise and J. Pera
Publication: Special Publication
Appears on pages(s): 257-270
Keywords: calcium sulfoaluminate cement; compressive strength; lithium carbonate; polycarboxylate; workability
Abstract:A new type of high-performance concrete was developed, based on calcium sulfoaluminate cement. It was designed to reach the following requirements: - high workability: slump higher than 200 mm for at least 50 minutes, - high-early strength: 40 MPa, 6 hours after its preparation, and higher than 55 MPa, after 24 hours. Different polycarboxylate-based superplasticizers and accelerators (lithium carbonate, calcium hydroxide, and normal portland cement) were studied. When the mixture does not contain any accelerator, no strength is recorded after 6 hours. The best accelerating mixture is that containing both lithium carbonate and normal portland cement. The cementitious material is composed of 80% calcium sulfoaluminate cement and 20% normal portland cement. The dosage of lithium carbonate is 0.005% by mass of cementitious material. For a cementitious material content of 600 kg/m3 and W/CM = 0.37, the following performances were obtained: - working time: 65 minutes, - compressive strength: 48 MPa after 6 hours, 57 MPa after 24 hours, and 81 MPa after 60 days.
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