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Presentation

Flávia Ribeiro Furtado de Mendonça Thesis Defense

Mixture Design Development Based on Fresh and Hardened Properties of Ultra-High Performance Concrete

Date:
Time:
3:00 pm
Peter Kiewit Institute Room: 207
April 16
3:00 PM
PKI 207

Advisor: Jiong Hu
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 models are typically used to design UHPC, due to the complexity of UHPC composition interaction and characteristics, models might not necessarily provide the best UHPC performance leading to necessary experimentally evaluation of the impact of different parameters in the properties of UHPC. A comprehensive study and evaluation were performed with multiple series of mixtures prepared with different mix design parameters and considerations. The impact of different aggregate gradation, fiber, high-range water reducer, w/b, cement type, supplemental cementitious materials types and quantities, and different total binder content on UHPC performance is presented.
Furthermore, the extensive amount of fine materials, together with the absence of coarse aggregate and the very low w/b often makes the mixing process of UHPC challenging. This study included an evaluation of the impact of mixers on the fresh and hardened properties of UHPC. The comparison helps to justify if mixtures developed in the laboratory are comparable to those to be used in the field production.

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