Mechanical Performance of Cementitious Materials Reinforced with Polyethylene Fibers and Carbon Nanotubes

被引:2
|
作者
Alaraj, Rashad R. [1 ]
Tamimi, Adil K. [1 ]
Hassan, Noha M. [2 ]
Fattah, Kazi Parvez [3 ]
机构
[1] Amer Univ Sharjah, Coll Engn, Dept Civil Engn, POB 26666, Sharjah, U Arab Emirates
[2] Amer Univ Sharjah, Dept Ind Engn, Engn Syst Management, POB 26666, Sharjah, U Arab Emirates
[3] Univ Kansas, Dept Civil Environm & Architectural Engn, Lawrence, KS 66045 USA
关键词
concrete; cementitious composite; carbon nanotubes; polyethylene fibers; mechanical behavior; strength; ductility; MICROSTRUCTURE; DISPERSION; BEHAVIOR;
D O I
10.3390/fib12010001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The cracking of cementitious materials due to their quasi-brittle behavior is a major concern leading to a loss in strength and durability. To limit crack growth, researchers have incorporated microfibers in concrete mixes. The objective of this study is to determine if nano-reinforcements can arrest cracks and enhance the material performance in comparison to microfibers. A total of 28 specimens were prepared to investigate and compare the effects of incorporating carbon nanotubes (CNTs) as a nano-reinforcement and polyethylene (PE) fibers at a macro-level and their combination. Compressive and flexural strengths were experimentally tested to assess the mechanical performance. The microstructure of the mortar samples was also examined using a scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The ductility increased by almost 50% upon the addition of CNTs, while no significant enhancement was witnessed for the compressive strength. The flexural strength increased by 169% and the flexural strain by 389% through the addition of the combination of CNTs and PE fibers.
引用
收藏
页数:20
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