Preparation and Performance of Carbon Nanotube Modified Cement-Based Phase Change Material in Steel Bridge Engineering

Abstract

Carbon nanotubes have excellent mechanical, electrical and chemical stability, and they are an excellent filler for the development of high-performance, multifunctional/smart cement-based composite materials. In order to understand the preparation and performance of carbon nanotubes modified cement-based, this paper studies the effects of carbon nanotube types and content on the mechanical, electrical, and electromagnetic wave shielding/absorption properties of cement-based materials. The product phase (morphology, composition, structure and content), composite material equivalent circuit and electromagnetic parameter analysis, and fiber-reinforced cement-based composite material mechanical calculations explore the modification mechanism of carbon nanotube cement-based materials. The experimental results found that when the amount of carbon nanotube modified cement is 0–3%, the flexural strength shows an upward trend. At 3–12%, the flexural strength gradually decreases, but in the range of 3–6%. From time to time, although the flexural strength is decreasing, after the final decrease, the strength is still greater than that of the traditional cement-based composite mortar. This shows that carbon nanotubes modified cement-based phase change materials can play an important role in steel bridge engineering.