Effect of functionalized multi-walled carbon nanotubes on mechanical properties and durability of cement mortars. (September 2021)

• Record Type: Journal Article
• Authors: Mansouri Sarvandani, Morteza; Mahdikhani, Mahdi; Aghabarati, Hassan; Haghparast Fatmehsari, Meisam
• Is Part Of: Journal of building engineering. Volume 41(2021)
• Publication Date: 2021-09
• Subjects: Multi-walled carbon nanotubes (MWCNTs) -- Nanocomposites -- Sulfate resistance -- Dispersion -- Bridging; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2021.102407
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: This article deals with the effects of using COOH functionalized multi-walled carbon nanotubes (MWCNTs) on mechanical properties and durability of cement mortars. In this study, the behavior of nanocomposites modified with well-dispersed MWCNTs at 0.05, 0.1, 0.2, 0.3, and 0.4 wt percent of cement using compressive and flexural strength tests subjected to environmental conditions of combined sodium-magnesium sulfate and limestone-saturated water up to long-term exposure of 960 days were analyzed. The results revealed that adding functionalized MWCNTs as a bridging factor increases the flexural strength of nanocomposites stored in limestone-saturated water and sulfate solution by 37% and 42%, respectively. Moreover, as a filler, by refining pores and changing the microstructure, it improved compressive strength in the two mentioned environments by 25% and 39%, respectively. Highlights: Functionalized MWCNTs reinforce the cement mortar using effective dispersion approaches. The impact of MWCNTs shows the improvement of mechanical properties and water absorption. Compressive and flexural strength of cement mortar in sulfate solution are improved by MWCNTs. Proving the role of MWCNTs as a bridging and filling agent in cement mortar using SEM images.