Nanoscale characterization of engineered cementitious composites (ECC)

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.11.001· OSTI ID:21490052

Li, Victor C

Engineered cementitious composites (ECC) are ultra-ductile fiber-reinforced cementitious composites. The nanoscale chemical and mechanical properties of three ECC formulae (one standard formula, and two containing nanomaterial additives) were studied using nanoindentation, electron microscopy, and energy dispersive spectroscopy. Nanoindentation results highlight the difference in modulus between bulk matrix ({approx} 30 GPa) and matrix/fiber interfacial transition zones as well as between matrix and unreacted fly ash ({approx} 20 GPa). The addition of carbon black or carbon nanotubes produced little variation in moduli when compared to standard M45-ECC. The indents were observed by electron microscopy; no trace of the carbon black particles could be found, but nanotubes, including nanotubes bridging cracks, were easily located in ultrafine cracks near PVA fibers. Elemental analysis failed to show a correlation between modulus and chemical composition, implying that factors such as porosity have more of an effect on mechanical properties than elemental composition.

• OSTI ID: 21490052
• Journal Information: Cement and Concrete Research, Vol. 41, Issue 2; Other Information: DOI: 10.1016/j.cemconres.2010.11.001; PII: S0008-8846(10)00233-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON BLACK
CEMENTS
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
CRACKS
FIBERS
FLY ASH
MECHANICAL PROPERTIES
MICROSTRUCTURE
NANOTUBES
POROSITY
PRESSURE RANGE GIGA PA
PVA
REINFORCED MATERIALS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
AEROSOL WASTES
ALCOHOLS
ASHES
BUILDING MATERIALS
CARBON
COMBUSTION PRODUCTS
ELECTRON MICROSCOPY
ELEMENTS
HYDROXY COMPOUNDS
MATERIALS
MICROSCOPY
NANOSTRUCTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
PRESSURE RANGE
RESIDUES
WASTES