Abstract
High-performance concrete and high-quality ordinary concrete, with or without silica fume, were tested for mechanical and fracture mechanical properties. Testing was performed at 28 days and 2 years. Ten percent silica fume resulted in a 20 to 25% increase in the direct tensile strength and a 10 to 20% increase in flexural and compressive strength, but had little effect on the dynamic modulus of elasticity. The brittleness appeared to increase with the presence of silica fume.
Résumé
Les propriétés mécaniques de la rupture ont été testées sur des bétons de hautes performances et sur des bétons ordinaires de haute qualité, avec ou sans fumée de silice. Les essais ont été effectués à 28 jours et à 2 ans. L’ajout de dix pour cent de fumée de silice a pour effet l’augmentation de la résistance en traction directe de 20 à 25% ainsi que l’augmentation des résistances en flexion et en compression de l’ordre de 10 à 20%, mais a peu d’effet sur le module d’élasticité dynamique. Par ailleurs, la fragilité du béton est accrue en présence de fumée de silice.
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Editorial Note Dr. Olafur Wallevik is a RILEm Senior Member. He participates in RILEM TCs 145-WSM (Workability of special concrete mixes) and 174-SCC (Self-Compacting Concrete) as well as in RILEM TC 181-EAS (Early age shrinkage induced stresses and cracking in cementitious systems) as a Corresponding Member.
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Kjellsen, K.O., Hallgren, M. & Wallevik, O.H. Fracture mechanical properties of high-performance concrete—Influence of silica fume. Mat. Struct. 33, 552–558 (2000). https://doi.org/10.1007/BF02480535
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DOI: https://doi.org/10.1007/BF02480535