Evaluation of Carbon Nanotube Incorporation in Cementitious Composite Materials

• Published in: Materials Vol. 12; no. 9; p. 1504
• Main Authors: Evangelista, Ana Catarina Jorge, de Morais, Jorge Fernandes, Tam, Vivian, Soomro, Mahfooz, Torres Di Gregorio, Leandro, Haddad, Assed N
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 08-05-2019; MDPI
• Subjects: Atoms & subatomic particles; Carbon; Cement hydration; Composite materials; Compressive strength; Concrete; Construction industry; Construction materials; Crack propagation; Design of experiments; Flexural strength; Laboratories; Mechanical properties; Mortars (material); Multi wall carbon nanotubes; Nanomaterials; Nanotechnology; New technology; Nondestructive testing; Physical properties; Portland cements; Storage modulus; Tensile strength; Spain; compressive strength; non-destructive test; SEM; carbon nanotubes; cementitious materials
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma12091504

Over the last decades, new materials with outstanding performance have been introduced in the construction industry. Considering these new technologies, it is worth mentioning that nanotechnology has revolutionized various areas of engineering. In the area of civil engineering and construction, cement is used for various purposes and the search to improve its performance has been receiving growing interest within the scientific community. The objective of this research was to evaluate the behavior of cement mortar produced by the addition of multi-walled carbon nanotubes (MWCNTs) in different concentrations by comparing their physical and mechanical properties with the properties of the nanotube-free composite. Motivated by the lack of consensus in the literature concerning to the optimal dosage of CNTs in cementitious matrices, three different carbon nanotube ratios, 0.20, 0.40 and 0.60 wt % Portland cement, were investigated with the aim of evaluating the mechanical properties. Destructive tests were carried out to determine the compressive strength, flexural strength and split tensile strength. Additionally, a non-destructive test was performed to determine the dynamic elastic modulus and density. Scanning electron microscopy (SEM) images showed the interaction between the MWCNTs and the hydration products of Portland cement mortar. The results indicated the potential contribution of 0.40 wt % cement CNTs to the enhancement of the mechanical properties of the cement composite as a promising construction material.