Journal
CEMENT & CONCRETE COMPOSITES
Volume 84, Issue -, Pages 146-156Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.08.019
Keywords
Eco-efficient; Self-compacting; Ultra-fine fly ash; Cost efficient; Statistical mixture design; Short-fiber composite
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The research described in this paper represents a statistically based model with the help of response surface methodology (RSM) aiming to study the applicability of this method to ultra-high performance concrete (UHPC) mixture design and its optimization. Besides, the effects of silica fume, ultra-fine fly ash (UFFA) and sand as three main variable constituents of UHPC on workability and compressive strength as the main performance criteria and responses of this high-tech material were investigated. The models proposed here demonstrate a perfect correlation among variables and responses. Furthermore, through performing a multi-objective optimization, cement and silica fume, as two main constituents of UHPC affecting its eco-efficiency and cost, were substituted by UFFA and sand as much as possible. Finally, an eco-efficient UHPC with cement and silica fume content of 640 kg/m(3) and 56.3 kg/m(3) respectively and compressive strength and flow diameter of 160.3 MPa and 19 cm was developed. (C) 2017 Elsevier Ltd. All rights reserved.
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