Study On Mechanical Properties And Electrical Behaviors Of Carbon Fibers/Carbon-black Nanoparticles Reinforced Composites

The electrical behaviors of carbon-black nanopaticles epoxy-matrix composite were studied though experimental research.Both the mechanical and electrical properties of concretes with carbon-black nanopaticles and carbon fiber admixtures were also studied though many experiments.Preliminary investigation into these materials as a smart structure are also presented in this paper.Results show that the carbon-black nanopaticles reinforced composites can act as a self-sensing material on steel bar due to its piezoresistive effect that changes when strained.Research into the mechanical and electrical properties of concretes with carbon-black nanoparticles and carbon fibers admixtures indicate that the flexural and compressive strengths of the materials are increased.However, the two admixtures increase the strength of the concrete in different ways. Cabon-black nanoparticles increase the concrete strength by increasing the density of the internal concrete structure and improving the bond between the aggregates.Carbon fibers increase the concrete strengths by controlling the development of internal cracks.Both admixtures make the concrete have electrical properties that allow it to serve as a pressure sensor. The sensitivity of the concrete to pressure changes increase with age. Comparisons of concrete blocks with varying admixture amounts and ages show that concrete with the carbon-black nanopaticles admixture has a stable pressure sensitivity.Finally, a steel- concrete smart structure is studied. Research into the pressive sensing capabilities of structures using the carbon-black nanopaticles reinforced composites on steel and concrete with carbon-black nanoparticles admixtures yielded satisfactory results.