Cement reinforced with high concentrations of mechanically dispersed multiwalled carbon nanotubes and carbon nanofibers
AssigneeNorthwestern University
InventorsAnge-Therese Akono, Jiaxin Chen
Life of this patent
Estimating the term…
Abstract
Methods for the dispersion and synthesis of multi-walled carbon nanotube-cement composites with high concentrations of multi-walled carbon nanotubes that do not require chemical dispersion aids or dispersion-enhancing chemical surface functionalization are provided. Also provided are multi-walled carbon nanotube-cement composites made using the methods. Methods for the dispersion and synthesis of carbon nanofiber-cement composites with high concentrations of carbon nanofibers that do not require chemical dispersion aids or dispersion-enhancing chemical surface functionalization are further provided. Also provided are carbon nanofiber-cement composites made using the methods.
Claims17
A cement composite comprising:
- Portland cement;
- and
- multiwalled carbon nanotubes that are free of dispersion-enhancing chemical surface functionalization and are present at a concentration in the range from 0.2 wt % to 1.0 wt %, based on the total weight of the Portland cement and the multiwalled carbon nanotubes, wherein:
- the cement composite is free of dispersing aids;
- the cement composite has a gel porosity in the range from 0.15 to 0.20 and a capillary porosity of less than 0.1;
- the cement composite has a volume fraction of high-density calcium-silicate-hydrates in the range from 0.3 to 0.6;
- and
- the cement composite has a Young' modulus in the range from 15 GPa to 50 GPa.
A cement composite comprising:
- Portland cement;
- and
- carbon nanofibers that are free of dispersion-enhancing chemical surface functionalization and are present at a concentration in the range from 0.1 wt % to 0.5 wt %, based on the total weight of the Portland cement and the carbon nanofibers, wherein:
- the cement composite is free of dispersing aids;
- the cement composite has a gel porosity in the range from 0.16 to 0.20 and a capillary porosity of less than 0.1;
- the cement composite has a volume fraction of high-density calcium-silicate-hydrates in the range from 0.65 to 0.75;
- and
- the cement composite has a Young' modulus in the range from 30 GPa to 40 GPa.
Dependencies are inferred from the claim text.