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Title:

Nanoengineering Ultra-High-Performance Concrete with Multiwalled Carbon Nanotubes

Accession Number:

01157603

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Blurbs/Nanotec...Cement_and_Concrete_Volume_2_163738.aspx

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Order URL: http://worldcat.org/isbn/9780309142779

Abstract:

Ultra-high-performance concretes (UHPCs) are characterized by extremely high packing densities. These densities can be achieved with optimization of grain size distribution by incorporating a homogeneous gradient of fine and coarse particles during mixing. Addition of steel fibers can increase the ductility under tensile loading tremendously. The packing density is a key parameter for the high bond strength between steel fibers and the UHPC matrix. The objective of this study is twofold: to enhance the behavior of the bond between the steel fibers and the matrix by increasing packing density with the inclusion of nanometer-sized particles while preserving the workability of the concrete mix. Multiwalled carbon nanotubes (MWNTs) were chosen for their unique physical and impressive mechanical properties (i.e., ultimate strength, stiffness, and ductility). However, because of the nanotubes’ inherent tendency to agglomerate, an extensive study was conducted to optimize their dispersion in solutions suitable for concrete mixing. An experimental validation study was then conducted to explore the effects of incorporating MWNTs in mixes with only 0.022% by cement weight and how they affect the bond behavior of two different high-strength steel fibers. Mechanical characterization studies revealed that low concentrations of MWNTs can significantly improve the bonding behavior of single pulled-out high-strength steel fibers. No conclusive evidence can be drawn with regard to MWNTs’ influence on the UHPCs’ compressive and bending strengths [i.e., 200 and 13 MPa (30 and 1.9 ksi), respectively].

Monograph Accession #:

01157601

Report/Paper Numbers:

NANO10-0063

Language:

English

Authors:

Wille, Kay
Loh, Kenneth J

Pagination:

pp 119-126

Publication Date:

2010

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2142
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309142779

Media Type:

Print

Features:

Figures (6) ; References (19) ; Tables (3)

Candidate Terms:

Nanotubes

Uncontrolled Terms:

Particle size distribution

Subject Areas:

Materials; I32: Concrete

Files:

TRIS, TRB, ATRI

Created Date:

May 27 2010 2:00PM

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