A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
High performance self compacting concrete, HPSCC
This article outlines ongoing experimental and numerical investigations of HPSCC. For this purpose optimising was performed on a laboratory scale according to the principle of an ideal grading curve of the particle in the fresh concrete. Studies were performed on strength, creep, shrinkage and salt frost scaling. Finally the material was introduced in the full-scale production of pile caps. The full-scale introduction during high ambient temperature, about 30 deg C (July 2001), was successful. The results show that the workability was excellent with slump flow around 750 mm and robustness allowing for a variation of the water-cement ratio of +/- 0.02 keeping the fresh concrete properties within the limits of the full-scale factory production. The workability of the self-compacting concrete performed excellently also after 1 h. The one-day strength exceeded 60 MPa with 111 MPa strength at 28 days' age. The early strength development was very high even though the water to cement ratio was higher in the self-compacting concrete than in the vibrated reference concrete, NCC, 0.36 instead of 0.33. Shrinkage was slightly larger and elastic modulus slightly smaller in HPSCC than in NCC due to lower aggregate content in HPSCC than in NCC. On the other hand the creep coefficient was slightly smaller in HPSCC than in NCC. Salt frost scaling of HPSCC did not differ much from the corresponding properties of NCC. Comparisons between the results of the present study and results of the fib 2000 Model for creep and shrinkage showed correct values for creep and shrinkage for both HPSCC and NCC except for autogenous shrinkage, where the measured values were larger than values obtained by the Model.
High performance self compacting concrete, HPSCC
This article outlines ongoing experimental and numerical investigations of HPSCC. For this purpose optimising was performed on a laboratory scale according to the principle of an ideal grading curve of the particle in the fresh concrete. Studies were performed on strength, creep, shrinkage and salt frost scaling. Finally the material was introduced in the full-scale production of pile caps. The full-scale introduction during high ambient temperature, about 30 deg C (July 2001), was successful. The results show that the workability was excellent with slump flow around 750 mm and robustness allowing for a variation of the water-cement ratio of +/- 0.02 keeping the fresh concrete properties within the limits of the full-scale factory production. The workability of the self-compacting concrete performed excellently also after 1 h. The one-day strength exceeded 60 MPa with 111 MPa strength at 28 days' age. The early strength development was very high even though the water to cement ratio was higher in the self-compacting concrete than in the vibrated reference concrete, NCC, 0.36 instead of 0.33. Shrinkage was slightly larger and elastic modulus slightly smaller in HPSCC than in NCC due to lower aggregate content in HPSCC than in NCC. On the other hand the creep coefficient was slightly smaller in HPSCC than in NCC. Salt frost scaling of HPSCC did not differ much from the corresponding properties of NCC. Comparisons between the results of the present study and results of the fib 2000 Model for creep and shrinkage showed correct values for creep and shrinkage for both HPSCC and NCC except for autogenous shrinkage, where the measured values were larger than values obtained by the Model.
High performance self compacting concrete, HPSCC
Selbstverdichtender Hochleistungsbeton, HPSCC
Persson, B. (author) / Terrasi, G.P. (author)
2002
18 Seiten, 33 Bilder, 6 Tabellen, 24 Quellen
Conference paper
English
Self-Compacting High Performance Concrete
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