Microstructure and mechanical behavior of cementitious composites with multi-scale additives
Author | Irshidat, Mohammad R. |
Author | Al-Nuaimi, Nasser |
Author | Rabie, Mohamed |
Available date | 2024-04-17T11:38:13Z |
Publication Date | 2021-02 |
Publication Name | Advances in Concrete Construction |
Identifier | http://dx.doi.org/10.12989/acc.2021.11.2.163 |
Citation | Irshidat, M. R., Al-Nuaimi, N., & Rabie, M. (2021). Microstructure and mechanical behavior of cementitious composites with multi-scale additives. Advances in concrete construction, 11(2), 163-171. |
ISSN | 2287-5301 |
Abstract | This paper studies the effect of using multi-scale reinforcement additives on mechanical strengths, damage performance, microstructure, and water absorption of cementitious composites. Small dosages of carbon nanotubes (CNTs) or polypropylene (PP) microfibers; 0.05%, 0.1%, and 0.2% by weight of cement; were added either separately or simultaneously into cement mortar. The experimental results show the ability of these additives to enhance the mechanical behavior of the mortar. The best improvement in compressive and flexural strengths of cement mortar reaches 28% in the case of adding a combination of 0.1% CNTs and 0.2% PP fibers for compression, and a combination of 0.2% CNTs and 0.2% PP fibers for flexure. Adding CNTs does not change the brittle mode of failure of plain mortar whereas the presence of PP fibers changes it into ductile failure and clearly enhances the fracture energy of the specimens. Scanning electron microscopic (SEM) images of the fracture surfaces highlights the role of CNTs in improving the adhesion between the PP fibers and the hydration products and thus enhance the ability of the fibers to mitigate cracks propagation and to enhance the mechanical performance of the mortar. |
Sponsor | This work was funded by the Office of Research and Graduate studies at Qatar University under project QUST-1-CAM-2019-1. |
Language | en |
Publisher | Techno Press |
Subject | carbon nanotubes cement mortar damage polypropylene fibers strength |
Type | Article |
Pagination | 163-171 |
Issue Number | 2 |
Volume Number | 11 |
ESSN | 2287-531X |
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