4.7 Article

Microstructural packing- and rheology-based binder selection and characterization for Ultra-high Performance Concrete (UHPC)

期刊

CEMENT AND CONCRETE RESEARCH
卷 103, 期 -, 页码 179-190

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.10.013

关键词

Ultra-high performance concrete; Microstructure; Rheology; Hydration; Compressive strength

资金

  1. Arizona Department of Transportation (ADOT) [SPR 745]
  2. Laboratory for the Science of Sustainable Infrastructural Materials at Arizona State University

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This paper reports strategies to design the binder phase of ultra-high performance concretes (UHPC) from commonly available cement replacement (fly ash, slag, microsilica, metakaolin) and fine filler (limestone) materials. A packing algorithm is used to extract the number density, mean centroidal distance, and coordination number of the microstructure. Similarly, rheological studies on the pastes provide yield stress, plastic viscosity, and min-slump spread. The selection criteria involves using the three microstructural and three rheological parameters individually or in combination to define packing and flow coefficients. The selection criteria is flexible enough to allow users modify the constraints depending on the application. In this study, only ternary and quaternary blends, with a total cement replacement of 30% by mass are selected for further characterization. The highly efficient microstructural packing in these mixtures and better workability that facilitated dispersion of particles to enhance the reactivity results in beneficial pore structure and mechanical properties.

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