Properties of concrete with addition carbon nanotubes: A review

The addition of carbon nanotubes (CNTs) in concrete has the potential to improve the strength, durability, and thermal characteristics of the concrete, resulting in more durable concrete. However, further study is required to properly understand the benefits and limits of CNT-based concrete. Therefore, this article's goal is to perform a rigorous evaluation of CNT-based concrete and to highlight the need for more research to improve the mechanical or durability features. All the crucial aspects of CNT, including its types, structure, preparation, physical and chemical properties, are reviewed. In addition, the flowability, durability, high-temperature performance, and morphology of CNT-based concrete are also reviewed. Results show that the CNT increased the concrete strength and durability. Additionally, with the inclusion of CNT, concrete performance at high temperatures improved. However, the addition of CNT caused a decline in concrete flowability due to agglomeration, particularly at higher doses. The majority of studies advise 0.10 percent (by weight of binder) as the ideal CNT dosage. The study also identifies the research gaps that need to be filled to further enhance the performance of CNT-based concrete.