01157617

Component

https://doi.org/10.3141/2142-15

http://scholar.google.com...dani&publication_year=2010

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.

01157601

NANO10-0052

English

pp 102-108

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309142779

Print

Figures (10) ; Photos (1) ; References (6) ; Tables (2)

Cement mortars; Compressive strength; Concrete; Dispersions (Chemistry); Ductility; Hydration; Nanotechnology; Tensile strength; Workability; Young's modulus

Nanotubes

Scanning electron microscopy

Materials; I32: Concrete

TRIS, TRB, ATRI

May 27 2010 1:07PM

• American Road Map for Research for Nanotechnology-Based Concrete Materials
• Carbon Nanofiber–Reinforced Cement-Based Materials
• Direct Synthesis of Carbon Nanofibers on Cement Particles
• Distribution of Carbon Nanofibers and Nanotubes in Cementitious Composites
• Enhancement of Reactive Powder Concrete via Nanocement Integration
• Exploratory Investigation of Nanomaterials to Improve Strength and Permeability of Concrete
• Laboratory Assessment of a Self-Healing Cementitious Composite
• Modeling Nanoindentation of Calcium Silicate Hydrate
• Molecular Dynamics Study of Interaction Between Corrosion Inhibitors, Nanoparticles, and Other Minerals in Hydrated Cement
• Molecular Dynamics to Understand the Mechanical Behavior of Cement Paste
• Nanocellulose and Microcellulose Fibers for Concrete
• Nanoengineering Ultra-High-Performance Concrete with Multiwalled Carbon Nanotubes
• Nanotechnology and Concrete: Concepts and Approach
• Nanotechnology to Manipulate the Aggregate–Cement Paste Bond Effects on Mortar Performance
• New Calcium Silicate Hydrate Network
• New Possibilities and Future Pathways of Nanoporous Thin Film Technology to Improve Concrete Performance
• Performance of Carbon Nanofiber–Cement Composites with a High-Range Water Reducer
• Scanning Transmission X-Ray Microscopic Study of Carbonated Calcium Silicate Hydrate
• Stability of Synthetic Calcium Silicate Hydrate Gels in Presence of Alkalis, Aluminum, and Soluble Silica