Title:
Multiscale Nanofiber-Reinforced Concrete for Enhancing Intrinsic Tensile Strength
Author(s):
S.H. Chu
Publication:
Materials Journal
Volume:
122
Issue:
3
Appears on pages(s):
3-14
Keywords:
fiber-reinforced concrete (FRC); intrinsic; microfiber (MF); nanofiber (NF); synergy; tensile
DOI:
10.14359/51746710
Date:
5/1/2025
Abstract:
The weakness of concrete in tension can be mitigated by
developing fiber-reinforced concrete (FRC) to induce pseudoductility. However, enhancing the intrinsic tensile strength of the matrix in FRC has received little attention. In this regard, nanofibers, which can improve the intrinsic tensile properties of the
matrix, were used in conjunction with microfibers to enhance
intrinsic tensile strength. Different volumes of nanofibers (0.0 to
0.6%) and microfibers (0.0 to 2.0%) were tested, and various fresh
and hardened properties were analyzed. Test results show that the
high-range water-reducing admixture dosage increased with both
nanofiber and microfiber volume and that strength increased with
microfiber volume, reaching an optimum point at a certain nanofiber
dosage. Moreover, incorporating nanofibers and microfibers
to develop multiscale FRC (MSFRC) significantly improved direct
tensile strength and energy absorption. The synergy between nanofibers and microfibers was revealed both qualitatively and quantitatively, contributing to the advancement of FRC.