Abstract:

With the development of nanotechnology, the use of nanomaterials with specific characteristics in the construction sector also attracts the interest of researchers. According to literature, carbon nanotubes (CNTs) are among the high availability nanomaterials in cement materials. While there are many studies on multi-wall carbon nanotubes (MWCNT) on extra concrete, research on the behavior of single-wall carbon nanotubes (SWCNT) on concrete is quite limited. This study examined the mechanical and electrical characteristics of ultra-high-performance cement composites (UHPCs) produced using SWCNT at 0.0125, 0.020 and 0.025 percent of the cement weight. Four of the eight prepared UHPC mixtures included only SWCNT and four included SWCNT+ Micro Steel Fiber. In the UHPC mixture, micro steel fiber is used in weight by 4%. Leadership and inclination experiments were performed on samples of 12 x 3 x 2 cm. The 28 day pressure resistance was determined by using 7 cm diameter and 14 cm long silinder samples. The two-point single-axis method, which is common in the measurement of cemented materials for electrical resistance measurement, has been used. According to the results obtained, the positive effects of SWCNT on the mechanical characteristics of UHPCs have been observed. With the addition of SWCNT and the increase in its ratio, electrical resistance has decreased, but it has been found that the use of SWCNT at higher ratio is necessary to increase the occurring flow rate. The effect of SWCNT on electrical resistance parameters in micro-steel fiber mixture has also been seen to be more noticeable.

Keywords: