A multi-scale approach for evaluating the mechanical characteristics of carbon nanotube incorporated cementitious composites

•Multiscale approach for evaluation of properties of CNT incorporated cement paste.•Unified expression to determine the properties of CNT using interatomic potentials.•Proposal for evaluating response at microlevel using representative volume element.•Evaluation of macro-level response of elements with CNT modified cement composite.

Cementitious composites are limited to the applications due to their lesser tensile strength and strain capacity. In the present study, an attempt has been made to improve the properties of cementitious composites using nano filament like materials such as carbon nano tube (CNT). Since, there is no well-established technique to determine the engineering properties of CNT of various geometries which is essential for effective application of the same to cementitious composite, a unified approach has been proposed by combining the classical and numerical method. Further, a square RVE of CNT incorporated cement paste is developed in which CNT is simulated as an equivalent continuum model at micro-level. The effect of variation of the percentage of CNT in the cementitious matrix on the strength and stiffness of CNT incorporated cement matrix is evaluated. Finally, with the evaluated properties of CNT reinforced cement both at nano and micro-level, non-linear FE investigation has been carried out to evaluate the macro response of structural component with varied degree and disposition of CNT incorporated composite. The findings of the present study will provide insight into the newly emerged material and its alluring scopes for application as construction and building materials.