NDLI: Application of fiber reinforced high performance composites in spun-cast elements

Content Provider	Springer Nature Link
Author	Kaufmann, J. P. Hesselbarth, D. Moser, K. Terrasi, G. P.
Copyright Year	2005
Abstract	Spin casting is an effective method to produce concrete pylons, masts or pipes. Through the centrifugation process the concrete is compacted and the desired shape, mostly round or ellipsoidal, is obtained. The pre-cast elements made using conventional concrete generally have to be reinforced with steel bars which are susceptible to corrosion. Furthermore, the placement of the steel reinforcement is time consuming and hence expensive and leads to rather thick and heavy structural elements. The application of short fiber reinforced cement (FRC) or mortar, as presented in this paper, is a suitable alternative for such weak-loaded bending elements. Special requirements regarding workability and strength have to be considered. Optimization of cement matrix was achieved with a blend of microfine cement and ordinary Portland cement, improving the rheological properties of the fresh mixture and resulting in a very dense cement matrix with excellent mechanical properties. Reinforcement with different kinds of short fibers of carbon and polyvinylalcohol was studied. Flow properties of the FRC were optimized with regard to the centrifugation process applying a new cone-consistency test. The mechanical properties of conventionally cast specimens and of centrifuged prototypes were investigated.La coulée centrifuge est une méthode efficace pour produire des pylônes ou des tuyaux en béton. La centrifugation provoque le compactage du béton et permet d'obtenir la forme désirée, le plus souvent circulaire ou ellipsoïdale. En règle générale le béton doit être renforcé au moyen d'aciers d'armature qui sont sensibles à la corrosion. De plus la pose de cette armature demande beaucoup de temps et est ainsi coûteuse et elle conduit encore à des éléments structuraux plutôt épais et lourds. L'utilisation de ciment ou de mortier renforcé de fibres courtes (CRF) représente une alternative intéressante pour les éléments soumis à de faibles charges de flexion. L'utilisation de ce matériau demande toutefois de tenir compte d'exigences particulières concernant son ouvrabilité et sa résistance. Pour optimiser la matrice de ciment, on a utilisé un mélange de ciment ultrafin et de ciment Portland ordinaire, ce qui a permis d'améliorer les propriétés rhéologiques du mortier frais et d'obtenir une matrice de ciment très dense présentant d'excellentes caractéristiques mécaniques. Les performances du renforcement au moyen de différents types de fibres de carbone et d'alcool polyvinylique ont été étudiées. Les propriétés d'écoulement du CRF ont été optimisées pour le processus de centrifugation en utilisant un nouvel essai d'étalement au cône. Une étude comparée des caractéristiques des éprouvettes coulées de manière conventionnelle et d'éprouvettes confectionnées par coulée centrifuge a été réalisée.
Starting Page	549
Ending Page	555
Page Count	7
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	38
Issue Number	5
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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