Nanoindentation study of the interfacial zone between cellulose fiber and cement matrix in extruded composites

Author(s)

Teixeira, R. S. ^[1] ; Tonoli, G. H. D. ^[2] ; Santos, S. F. ^[3] ; Rayon, E. ^[4] ; Amigo, V. ^[4] ; Savastano, Jr., H. ^[5] ; Rocco Lahr, F. A. ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Struct Engn, Sao Carlos Sch Engn, Sao Paulo - Brazil

^[2] Fed Univ Lavras UFLA, Dept Forest Sci, Lavras, MG - Brazil

^[3] Sao Paulo State Univ UNESP, Sch Engn, Dept Mat & Technol, Sao Paulo - Brazil

^[4] Univ Politecn Valencia, Dept Mech & Mat Engn, Valencia - Spain

^[5] Univ Sao Paulo, Dept Biosyst Engn, Sao Paulo - Brazil

• Document type: Journal article
• Source: CEMENT & CONCRETE COMPOSITES; v. 85, p. 1-8, JAN 2018.
• Web of Science Citations: 10

Abstract

The present study shows the application of the nanoindentation technique to evaluate the properties of the cellulose fiber-cement matrix interfacial zone in composites prepared with an auger extruder. The degree of strength of the bond between fiber and matrix is recognized as important variable that influences macro-mechanical properties, such as modulus of rupture and toughness of cement based composites. The nanoindentation measurements showed the highest hardness and elastic modulus in the part inner of the cellulosic fiber after hydration process due to precipitation and re-precipitation of cement hydration products. These results indicate that mineralization of the cellulosic fibers can affect the stress distribution and interfacial bond strength in the cement based composite. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 13/03823-8 - Rheological parameters of the process and its influence on the performance of extruded fibercement
• Grantee: Holmer Savastano Junior
• Support Opportunities: Regular Research Grants