Highly Dispersed CNT Reinforced Metakaolin-Cement Mortars with Enhanced Load-Bearing Capacity and Energy Absorption Capability

International Concrete Abstracts Portal

The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

  


Title: Highly Dispersed CNT Reinforced Metakaolin-Cement Mortars with Enhanced Load-Bearing Capacity and Energy Absorption Capability

Author(s): Rohitashva Singh

Publication: Web Session

Volume:

Issue:

Appears on pages(s):

Keywords:

DOI:

Date: 10/23/2022

Abstract:
The use of pozzolanic materials with a low energy-consumption footprint, such as metakaolin (MK), is a promising way for developing sustainable eco-efficient concrete with enhanced mechanical and fracture properties. The effective incorporation of nanoscale fibers, such as carbon nanotubes (CNTs), into the relatively brittle Metakaolin-Ordinary Portland Cement (MK-OPC) matrix holds great potential in enhancing the composite's energy absorption capacity. In this study, the development of MK-OPC mortars reinforced with low amounts of highly dispersed CNTs, ~0.1 wt%, is carried out. The mechanical and fracture properties were evaluated through fracture mechanics tests on notched beam specimens following the Linear Elastic Fracture Mechanics (LEFM) and Two-Parameter Fracture Model (TPFM). The results indicate that the synergistic effort of MK with high surface area and CNTs with high aspect ratio lead to substantial improvements in load-bearing capacity, modulus of elasticity, +70%, first-crack strength, +60%, and fracture toughness +80%; and energy absorption capability, first-crack and flexural toughness, +80%.




  

Edit Module Settings to define Page Content Reviewer