This paper describes the study of durability aspects of concrete incorporated with different dosages of (0 % - 0.40 %) of Multiwalled Carbon Nanotubes (MWCNTs). Each specimen was subjected to Acid attack test, Chloride attack test, Sulphate attack test and water permeability test for a duration of 28, 56 and 90 days respectively. It has been observed from the experiments that the specimen of 0.25% Multiwalled Carbon Nanotubes shows an extraordinary performance among the other specimens. It was also observed that this mix performed much better than the control specimen.

In the detailed study presented in this paper, an attempt was made to study the strength of cement when cenosphere (CS) and silica fume (SF) were used as replacement. Tests were carried out on mix with cenosphere as replacement for cement which has 12% of constant replacement of silica fume to the mass of cement, and this is made to stabilize the strength which was lost due to addition of cenosphere. From the test results, it was concluded that the strength loss of binder due to replacement of cenosphere can be stabilized by silica fume and still a safe value of strength can be achieved. Furthermore, the strength reduction is due to the consumption of hydration products and cloggy microstructure as observed in this study.

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