Multi-scale Characterization of Interfacial Transition Zone in Nano-Modified Concrete
XU Jing
WANG Binbin
ZHAO Sichen
Abstract：The effect of nano-SiO2 on the early mechanical properties of interfacial transition zone in concrete was studied at multi-scale levels.At macrolevel,the static modulus of elasticity,compressive and flexural strength were measured;at microlevel,the values and distribution of indentation modulus in interfacial transition zone were analyzed by nano-indentation.Results show that the addition of nano-SiO2 improves the early strength and modulus of both cement paste and concrete,in particular,a much significant increase of strength for concrete was observed.The amount of micro-pores and defects decreases remarkably and C-S-H gel with higher density forms in ITZ of concrete modified by nano-SiO2,thus the indentation modulus of ITZ is much closer to that of bulk paste.
Keywords：interfacial transition zone(ITZ)nano-SiO2nano-indentationelastic modulus
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 7-11 )