Highly dispersed carbon nanotube-reinforced cement-based materials

摘要

A composite cement material is prepared from cement material and carbon nanotubes, wherein the carbon nanotubes are present from about 0.02 wt % to about 0.10 wt % based on weight of cement material. The process for preparing such cement compositions includes sonicating a mixture of a surfactant, water, and carbon nanotubes; and blending the dispersion and the cement material to form a cementitious paste. The process may also include curing the cementitious paste. The composite cement materials are useful in a variety of cement applications where a reduction in nanoscale flaws and fractures is desired.

主权项

1. A cured nanocomposite cementitious composition, comprising:
cement; about 0.02% to about 0.1% multiwalled carbon nanotubes, by weight of the cement; and about 0.1 to 0.4% polycarboxylate based superplasticizer, by weight of the cement; wherein the cured nanocomposite cementitious material comprises calcium-silicate-hydrates; and further wherein the cured nanocomposite cementitious material has a Young's modulus that is at least 15% higher than that of the plain cured cement at the age of 28 days and further wherein the nanocomposite cementitious material exhibits a modified nanostructure so that the average values of stiffness and hardness of the calcium-silicate-hydrates, as determined by nanoindentation tests, are higher compared to the plain cured cement.