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Title: Experimental Investigation on Quantitative Nanomechanical Properties of Cement Paste

Author(s): Wengui Li, Jianzhuang Xiao, Shiho Kawashima, Gajendra S. Shekhawat, and Surendra P. Shah

Publication: Materials Journal

Volume: 112

Issue: 2

Appears on pages(s): 229-238

Keywords: cement paste; nanoindentation; nanomechanical properties; modulus mapping; PeakForce quantitative nanomechanical mapping (QNM)

DOI: 10.14359/51686986

Date: 3/1/2015

Abstract:
Nanoindentation, quantitative modulus mapping, and PeakForce quantitative nanomechanical mapping (QNM) are applied to investigate the quantitative nanomechanics of hardened cement paste at different spatial resolutions. The elastic modulus measured by static nanoindentation is slightly higher than those measured by the other methods. The average elastic modulus and probability obtained by PeakForce QNM are typically consistent with those found by modulus mapping. Both modulus mapping and Peak-Force QNM can be used to discriminate different material phases in cement paste at the nanoscale. It concludes that cement paste is a granular material in which the sub-micron scale grains or basic nanoscale units pack together. Moreover, the high resolution Peak-Force QNM can provide an efficient tool for identifying nanomechanical properties, particle sizes, and thickness of the interface between different nanoscale grains.