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Title: The nano-mechanical signature of Ultra High Performance Concrete by statistical nanoindentation techniques
Authors: Sorelli, Luca 
Constantinides, Georgios 
Ulm, Franz Josef 
Toutlemonde, François 
Keywords: Microstructure;Nanoindentation;Micromechanics;High perfomance concrete;Fiber reinforcement
Category: Materials Engineering
Field: Engineering and Technology
Issue Date: 2008
Publisher: Elsevier
Source: Cement and Concrete Research, Vol. 38, no. 12, 2008, pp. 1447-1456
Journal: Cement and Concrete Research 
Abstract: Advances in engineering the microstructure of cementitious composites have led to the development of fiber reinforced Ultra High Performance Concretes (UHPC). The scope of this paper is twofold, first to characterize the nano-mechanical properties of the phases governing the UHPC microstructure by means of a novel statistical nanoindentation technique; then to upscale those nanoscale properties, by means of continuum micromechanics, to the macroscopic scale of engineering applications. In particular, a combined investigation of nanoindentation, scanning electron microscope (SEM) and X-ray Diffraction (XRD) indicates that the fiber-matrix transition zone is relatively defect free. On this basis, a four-level multiscale model with defect free interfaces allows to accurately determine the composite stiffness from the measured nano-mechanical properties. Besides evidencing the dominant role of high density calcium silicate hydrates and the stiffening effect of residual clinker, the suggested model may become a useful tool for further optimizing cement-based engineered composites.
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2008.09.002
Rights: © 2008 Elsevier
Type: Article
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