American Society of Civil Engineers


Mechanical Properties of Nanocomposite Cement Incorporating Surface-Treated and Untreated Carbon Nanotubes and Carbon Nanofibers


by Rashid K. Abu Al-Rub, (corresponding author), M.ASCE, (Assistant Professor, Zachary Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843. E-mail: rabualrub@civil.tamu.edu), Bryan M. Tyson, S.M.ASCE, (Ph.D. Candidate, Zachary Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.), Ardavan Yazdanbakhsh, S.M.ASCE, (Ph.D. Candidate, Zachary Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.), and Zachary Grasley, M.ASCE, (Assistant Professor, Zachary Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.)

Journal of Nanomechanics and Micromechanics, Vol. 2, No. 1, March 2012, pp. 1-6, (doi:  http://dx.doi.org/10.1061/(ASCE)NM.2153-5477.0000041)

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Document type: Journal Paper
Abstract: 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 (H2 SO4) 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.


ASCE Subject Headings:
Nanotechnology
Cement
Mechanical properties
Carbon

Author Keywords:
Carbon nanotubes
Carbon nanofibers
Cement
Surface treatment
Mechanical properties