Journal
JOURNAL OF NANOMECHANICS AND MICROMECHANICS
Volume 2, Issue 1, Pages 1-6Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)NM.2153-5477.0000041
Keywords
Carbon nanotubes; Carbon nanofibers; Cement; Surface treatment; Mechanical properties
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Funding
- Southwest University Transportation Center (SWUTC) [DTRT07-G-0006]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0728032] Funding Source: National Science Foundation
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To study the effects of functionalized carbon nanotubes (CNTs) and carbon nanofibers (CNFs) on the mechanical properties of cement composites, both untreated and treated CNFs and CNTs were added to cement paste in concentrations of 0.1% and 0.2% by weight of cement. The surface-treated nanofilaments were functionalized in a solution of sulfuric acid (H2SO4) and nitric acid (HNO3). The nanofilaments were dispersed by using an ultrasonic mixer and were then cast into molds. Each specimen was tested in a custom-made three-point flexural test fixture to record the mechanical properties (i.e., the Young's modulus, flexural strength, ductility, and modulus of toughness) at the age of 7, 14, and 28 days. The microstructure was analyzed by using a scanning electron microscope. Untreated CNTs and CNFs were found to enhance the mechanical properties of cementitious materials, whereas the acid-treated CNTs and CNFs degraded the mechanical properties. (C) 2012 American Society of Civil Engineers.
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