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Thermal and hydrothermal treatment of UHPC: influence of the process parameters on the phase composition of ultra-high performance concrete
BAM Bundesanstalt für Materialforschung und -prüfung, Germany.
BAM Bundesanstalt für Materialforschung und -prüfung, Germany.
BAM Bundesanstalt für Materialforschung und -prüfung, Germany.
RISE Research Institutes of Sweden.
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2021 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 54, article id 44Article in journal (Refereed) Published
Abstract [en]

Several studies show that thermal and hydrothermal treatment can further improve the excellent properties of UHPC in terms of mechanical strength and durability. While for the thermal treatment the increase in strength is attributed to an intensified pozzolanic and hydraulic reaction, for the hydrothermal treatment previous studies accredited it mostly to the formation of tobermorite. In the presented study thermal and hydrothermal treatment of UHPC samples was systematically varied and the phase formation analysed related to the strength development of a reference sample cured for 28 days in water. For the thermal treatment the results show that the strength increase depends on the protection against desiccation and can be ascribed to an improved pozzolanic reaction of the siliceous fillers. To achieve a significant enhancement of strength, a pre-storage time of few days and a long dwell time at elevated temperature/pressure are required. For the hydrothermal treatment already heating the specimens up to 185 °C in saturated steam followed by an immediate cooling leads to a substantial increase in compressive strength. Pre-storage time did not affect the result as far as a minimum of several hours is guaranteed. The improved performance is due to an increase in the pozzolanic and hydraulic reaction. Surprisingly, tobermorite was only found within a very thin layer at the surface of the sample, but not in the bulk. Sulphate and aluminium stemming from the decomposition of the ettringite are bound in the newly formed phases hydroxylellestadite and hydrogarnet. © 2021, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media B.V. , 2021. Vol. 54, article id 44
Keywords [en]
Compressive strength, Durability, Hydrogarnet, Hydrothermal treatment, Hydroxylellestadite, Phase development, Thermal treatment, Tobermorite, UHPC, Heat treatment, Sulfur compounds, Elevated temperature, Hydrothermal treatments, Phase formations, Pozzolanic reaction, Process parameters, Siliceous fillers, Strength development, Strength increase, Ultra-high performance concrete
National Category
Ceramics
Identifiers
URN: urn:nbn:se:ri:diva-52519DOI: 10.1617/s11527-021-01633-wScopus ID: 2-s2.0-85100964606OAI: oai:DiVA.org:ri-52519DiVA, id: diva2:1538108
Note

Funding details: Deutsche Forschungsgemeinschaft, DFG, ME 1461/11-1; Funding text 1: The study was financially supported by the Deutsche Forschungsgemeinschaft (DFG) (Grant ME 1461/11-1). The authors thank Christian Selleng and Katja Gröger for assisting and conducting part of the experiments.

Available from: 2021-03-18 Created: 2021-03-18 Last updated: 2021-03-18Bibliographically approved

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