Carbon nanofibers (CNFs) dispersed in ultra-high performance concrete (UHPC): Mechanical property, workability and permeability investigation

Li, Linfei; Wang, Boning; Hubler, Mija H.

doi:10.1016/j.cemconcomp.2022.104592

Carbon nanofibers (CNFs) dispersed in ultra-high performance concrete (UHPC): Mechanical property, workability and permeability investigation

Journal Article · Fri May 13 04:00:00 EDT 2022 · Cement and Concrete Composites

DOI:https://doi.org/10.1016/j.cemconcomp.2022.104592· OSTI ID:1976935

Li, Linfei ^[1]; Wang, Boning ^[2]; Hubler, Mija H. ^[2]

University of Colorado, Boulder, CO (United States); OSTI
University of Colorado, Boulder, CO (United States)

This paper presents experimental data on the effect of carbon nano-fiber (CNF) dispersion on mechanical behavior, workability, and permeability of ultra-high-performance concrete containing CNF (UHPC-CNF). The addition of CNFs in concrete has been shown to provide improved performance. However, an inhomogeneous distribution of CNFs in the cement matrix can result in no impact or decreased mechanical performance. Due to the van der Waal's forces and hydrophobic surface properties of the CNFs, good dispersion in mix fluids and cement paste is challenging. Experimental studies of UHPC-CNF with different dispersion methods are provided. Further mixing with optimized UHPC paste allowed for the investigation of the optimal dosage of CNFs, impact on porosity, compressive strength, flexural strength, hydration rate, and slump. Scanning electron microscopy (SEM) analysis visually revealed the effect of dispersion. Our results indicate that shear mixing and subsequent ultrasonic dispersion with chemical surfactants can provide a well-dispersion liquid admixture of CNFs resulting in high mechanical performance of UHPC-CNFs composites. The water permeability and chloride resistance of optimized UHPC-CNFs composites were further evaluated with the wicking test and ponding test to reveal improved performance for these properties as well.

View Accepted Manuscript (DOE)

Research Organization:: University of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0031870

OSTI ID:: 1976935

Journal Information:: Cement and Concrete Composites, Journal Name: Cement and Concrete Composites Journal Issue: C Vol. 131; ISSN 0958-9465

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Carbon nanofibers (CNFs) dispersed in ultra-high performance concrete (UHPC): Mechanical property, workability and permeability investigation

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