The Mechanical and Physical Properties of Reactive Powder Concrete Reinforced with Carbon Nanotubes Reinforced with Standard Steel Fiber and Recycled Fiber from Tires

Abstract

Multi-walled carbon nanotubes (MWCNTs) are a promising material in the field of civil engineering because they have unique properties of high stiffness and strength, light weight, and good thermal conductivity. In this research, two parameters were studied. First one, 0.01% and 0.03% of MWCNTs (Taking as a proportion of the weight of cement) were added to reactive powder concrete. The second parameter was steel reinforcements where standard synthetic steel fiber was added to specified mixes and recycled waste tire wire was added to other mixes), to look into how they affect the mechanical and physical properties of reactive powder concrete (RPC). Cement has been partially replaced by silica fume because it is a key ingredient in RPC. The findings indicated that adding 0.03% carbon nanotubes increased the splitting tensile strength (SS), compressive strength (CS) and flexural strength (FS) by 20.09%,4.85% and 24%, respectively, of the standard steel fiber-reinforced RPC. Using recycled waste tire gives results that are close to those of standard manufactured steel fibers. The adding of 0.03% of MWCNTs and the recycled waste tire wire (RSFT) were improved the mechanical properties of RPC.