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Inicio Ciência & Tecnologia dos Materiais High-volume fly ash paste for developing ultra-high performance concrete (UHPC)
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Vol. 29. Issue 1.
Materiais 2015
Pages e157-e161 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e157-e161 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.10.001
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High-volume fly ash paste for developing ultra-high performance concrete (UHPC)
Iman Ferdosiana,
Corresponding author

Corresponding author.
, Aires Camõesa, Manuel Ribeirob
a Center of Territory, Environment and Construction(CTAC), Civil Engineering Department, University of Minho, 4800-058 Guimarães, Portugal
b UIDM, ESTG, Polytechnique Institute of Viana do Castelo, 4900-347, Viana do Castelo, Portugal
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Ultra-high performance concrete is a kind of high-tech composite material which shows superb characteristics such as self- compactness, compressive strength higher than 150MPa, and exceptional durability performances compared to other kinds of concrete. In this research, compared to known commercially available UHPCs, a type of UHPC paste with greener pozzolans was developed. In this regard, cement and silica fume, as two main constituents of the prevalent UHPC compositions and particularly with high cost and environmental impacts, were replaced by fly ash as a waste material. It was found that the highest fluidity and strength could be achieved with 13% and 16% of fly ash substitution, respectively. Furthermore, ultra-fine fly ash with mean particle size of 4.48μm showed its applicability to be used in UHPC with 20wt.% cement substitution resulting in a paste with 153MPa compressive strength and 37.5cm flow diameter. Moreover, addition of at least 5% silica fume seems to be a prerequisite regarding strength gain of UHPC paste. Metakaolin as another pozzolanic material was studied. Although it improved the paste strength, it demonstrated lower fluidity and showed its inability to be applied in UHPC with required high workability.

Ultra high performance concrete (UHPC)
ultra-fine fly ash
silica fume
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Copyright © 2017. Portuguese Society of Materials (SPM)
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