One of the most important areas of research in nanotechnology involves carbon nanotubes (CNTs) in commercial applications. Developing nanotechnology for cement and concrete has particular importance. The cement hydration chemistry and the physical behavior of hydration products have potential for manipulation through nanotechnology. A main objective of the development of cement-related nanotechnology is to produce stronger, tougher, lighter, and more durable products. Nanotubes were discovered in 1991 in Japan. They are available in single-wall and multiwall configurations. They have remarkable strength (>63 GPa) and a high Young's modulus. Nanotubes are applied in nanoscale, electrical, biotechnological, and composite materials and in enhancing physical properties. There is great potential for CNT use as reinforcement for concrete in compression and tension. This use would eliminate reinforced concrete corrosion problems, with significant expected gain in strength and ductility and improved dispersion of reinforcement. An expanded study at the University of Texas at Arlington is exploring the effect of CNTs in cement mortar for different types and dosage rates of multiwall nanotubes. The initial results are encouraging but depend largely on the mixing technique and workability issues. Strong capillary CNT forces drew water and decreased the workability of the mortar. Large voids resulted, reducing test strengths. Uniform dispersion of CNTs is mandatory, and a sonication technique was adapted to disperse them. Scanning electron microscopy is being used to investigate CNT dispersion into mortar matrix.
Strength Enhancement of Cement Mortar with Carbon Nanotubes
Early Results and Potential
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 2142 , 1 ; 102-108
01.01.2010
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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