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The Effect of the Diameter of Carbon Nanotube on the Mechanical and Electrical Properties of Cement Mortar

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Abstract:

Two different diameter carbon nanotubes were incorporated into cement mortar to investigate the effect on mechanical and electrical properties of composites. Cement-based composites have been prepared from Portland cement with various amounts of multiwall carbon nanotubes (MWCNTS), ranging from 0% to 0.3% by cement weight. In this study, effective dispersion of two different diameter MWCNTS in water were achieved by applying ultrasonic energy and in combination with the use of a surfactant. The flexural and compressive strength of mixes were investigated at age 7 and 28 days. The conductivity of composites were conducted by the four probe method at age of 3 day, 7 day,14 day and 28 day. Results indicated that the two carbon nanotubes can improve the flexural and compressive strength of the composites. Furthermore, the well dispersion carbon nanotube solutions can decrease the resistance of the composites as the better conductive networks are formed in the cement matrix, especially at the later ages. Scanning electron microscopy observation used to observe the fracture surface of specimens containing 0% and 0.3wt% nanotubes indicated that the MWCNTS were well dispersed and there were no obvious agglomerates visible in the matrix. The SEM image revealed good bonding between the MWCNTS and the surrounding matrix.

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Periodical:

Key Engineering Materials (Volume 730)

Pages:

479-485

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.730.479

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Online since:

February 2017

Authors:

Yan Feng Wang*, Hui Hu, Chui Qiang Rong

Keywords:

Carbon Nanotube, Cement, Compressive Strength, Conductivity, Flexural Strength

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* - Corresponding Author

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