Material Properties

Fresh and Hardened Behavior of UHPC Prepared with Different Mix Design Parameters

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Abstract

Ultra-high performance concrete (UHPC) is a new class of concrete that has superior workability, as well as mechanical and durability properties that far exceed those of conventional concrete. To achieve these properties, a very dense internal structure and the very low water-to-binder ratio (w/b) are generally necessary. While particle packing theories are typically used to design UHPC,due to the complexity of UHPC composition interaction and characteristics, the “theoretical optimum particle packing”might not necessarily provide the best UHPC performance. A comprehensive study of the impact of different design parameters such as types and amounts of supplemental cementitious materials (SCMs),binder content, and w/bare needed for a more rational design of UHPC. Besides, the extensive amount offine materials, together of the absense of coarse aggregate and the very low w/b often makes the mixing process of UHPC challenging. In this study, evaluations were performed with multiple series of mixtures prepared with different mix design parameters and considerations. In addition,this study included an evaluation of the impact of mixers on the fresh and hardened properties of UHPC.

Keywords: UHPC Mix Design, Particle Packing, Materials Selection, Water-to-Binder Ratio, Binder Volume, Type of Mixer, Mixing Procedure

How to Cite:

Medonca, F., Hu, J. & Morcous, G., (2019) “Fresh and Hardened Behavior of UHPC Prepared with Different Mix Design Parameters”, International Interactive Symposium on Ultra-High Performance Concrete 2(1). doi: https://doi.org/10.21838/uhpc.9688