Affordable Access

Leak-tight hot-water tanks out of ultra-high performance fibre reinforced concrete: Part 1: Design and construction of leak-tight hot-water tanks out of ultra-high performance fibre reinforced concrete. Part 2: Material tests and tests on the density of (ultra) high performance concrete Final report / Dichte Heisswasser-Waermespeicher aus ultrahochfestem Faserfeinkornbeton. Teilbericht 1: Entwurf und Konstruktion dichter Heisswasser-Waermespeicher aus ultrahochfestem Faserfeinkornbeton. Teilbericht 2: Baustoffversuche und Versuche zur Dichtigkeit von (Ultra)Hochleistungsbeton Abschlussbericht

Authors
  • Reineck, K.H.
  • Greiner, S.
  • Reinhardt, H.W.
  • Jooss, M.
  • univ., stuttgart
  • univ., im stuttgart
Publication Date
Jan 01, 2004
Source
OpenGrey Repository
Keywords
Language
German
License
Unknown

Abstract

The technical aims of the research project were achieved and it was proved that ultra-high-performance fibre reinforced concrete (UHPC) attains such a density that hot-water tanks can be built without an inner steel liner needed for normal concrete (NC). This also applies to high temperatures. For example, the steam diffusion coefficient D is 40-times lowe than for normal concrete and 6-times lower than high-strength concrete (HSC). The tensile strength of UHPC is so high that hot-water tanks can be designed without almost any reinforcement thus saving costs. The compressive strength, the axial, splitting and flexural tensile strength were tested with control specimens required for deriving design values. The design assumptions were checked by curved full-scale shell elements. So the basics for the design of hot-water tanks out of UHPC were defined, and the results were also considered in a state-of-the-art report by the DAfStb just being written. UHPC is best used for prefabricated elements, because a heat and/or a pressure treatment may be applied. Thus better material qualities can be assured and the final strength may be attained in 3 to 4 days so that the fabrication or construction process is considerably shortened. A main issue for using prefabricated elements is that the joints safely transfer the forces, and a joint construction was developed and successfully tested in pure tension. A cost comparison was performed of the hot-water-tank in Friedrichshafen (V=11.600 m"3) out of NC with an inner steel liner with designs out of HSC and UHPC, and the total costs for the tank decreased from 115 Euro/m"3 for NC to 108 Euro/m"3 for HSC and 87 Euro/m"3 for UHPC. It is noteworthy that the costs for the dense concrete structure alone decreased relatively seen far more from 68 Euro/m"3 for NC to 61 Euro/m"3 for HSC and 40 Euro/m"3 for UHPC. For a standardized tank with V=1.000 m"3 the total costs were 132 Euro/m"3 whereby only 34 Euro/m"3 or a quarter are attributed to the UHPC structure. This also means that in the range between V=11.600 m"3 and 1.000 m"3 the costs for a UHPC tank do not increase with decreasing volume but remain constant with about 40 to 34 Euro/m"3. Despite of the undoubtedly existing uncertainties of the cost assumptions for UHPC, the aim of the research project was achieved that hot-water tanks out of UHPC are technically feasible and contain a potential for substantial cost reductions for hot-water tanks. (orig.) / SIGLE / Available from TIB Hannover: F04B1855 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / Bundesministerium fuer Umwelt, Naturschutz und Reaktorsicherheit, Bonn (Germany) / DE / Germany

Report this publication

Statistics

Seen <100 times