Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Achieving Ultra-High Performance Concrete by Using Packaging Models in Combination with Nanoadditions

Version 1 : Received: 17 January 2021 / Approved: 18 January 2021 / Online: 18 January 2021 (12:44:45 CET)

A peer-reviewed article of this Preprint also exists.

Díaz, J.; Gálvez, J.C.; Alberti, M.G.; Enfedaque, A. Achieving Ultra-High Performance Concrete by Using Packing Models in Combination with Nanoadditives. Nanomaterials 2021, 11, 1414. Díaz, J.; Gálvez, J.C.; Alberti, M.G.; Enfedaque, A. Achieving Ultra-High Performance Concrete by Using Packing Models in Combination with Nanoadditives. Nanomaterials 2021, 11, 1414.

Journal reference: Nanomaterials 2021, 11, 1414
DOI: 10.3390/nano11061414

Abstract

This paper describes the packaging models that are fundamental for the design of ultra-high-performance concrete (UHPC), and their evolution. They are divided into two large groups: continuous and discrete models. The latter are those that provide the best answer in obtaining an adequate simulation of the packing of the particles up to nanometric size. This includes the interaction among the particles by means of loosening and wall coefficients, allowing a simulation of the virtual and real compactness of such particles. In addition, a relationship between virtual and real compactness is obtained, through the compaction index, which may simulate the energy of compaction that the particles undergo in their placement in the mold. The use of last-generation additives allows such models to be implemented with water-cement (w/c) ratios close to 0.18. However, the premise of maximum packing as a basic pillar for the production of UHPC should not be the only one. The cement hydration process affected by nanoadditions and the ensuing effectiveness in the properties in both fresh and hardened state according to the respective percentages in the mixture should also be studied. An adequate ratio and proportion of these additions may lead to an obtaining of better results even with lower levels of compactness.

Subject Areas

Particle packing; packaging models; packaging density; concrete; addition; nano addition; ultra-high-performance concrete

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