Utilizing Nanomaterials to Enhance Durability and Strength in Concrete

This study investigates the effect of carbon nanotube (CNT) addition in concrete on energy absorption. Concrete samples containing different CNTs were prepared and compared with samples without CNTs. The results showed that the addition of carbon nanotubes increased the compressive and flexural strength of concrete, indicating a potential improvement in building performance. For example, the 28-day ultimate strength of samples containing 0.0045 wt.% single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) was higher compared to 7, 14 and aged plain cement M20 samples. Higher on day 28) and 0.0030 wt.% SWCNT and MWCNT. Interestingly, nanocomposites with lower long MWCNT content showed similar properties to nanocomposites with higher short MWCNT content. Microcracks were found in carbon nanotubes, indicating their ability to bond and resist stress. Moreover, the slit tensile strength increases with the addition of carbon nanotubes, especially in 0.0015% multi-walled carbon nanotubes and 0.0030% to 0.0045% single-walled carbon nanotubes.