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Accession Number PB2013-103256
Title Nanotechnology-Based System for Damage-Resistant Concrete Pavements.
Publication Date Aug 2012
Media Count 124p
Personal Author R. K. Abu Al-Rub
Abstract The focus of this study was to explore the use of nanotechnology-based nanofilaments, such as carbon nanotubes (CNTs) and nanofibers (CNFs), as reinforcement for improving the mechanical properties of Portland cement paste and creating multifunctional and sensing concrete. Due to their ultra-high strength and very high aspect ratios, CNTs and CNFs have been excellent reinforcements for enhancing the physical and mechanical properties of polymer, metallic, and ceramic composites. Very little attention has been devoted to exploring the use of nanofilaments in the transportation industry, however. Therefore, this study aimed to bridge the gap between nanofilaments and transportation materials. This was achieved by testing the integration of CNTs and CNFs in ordinary Portland cement paste through state-of-the-art techniques. Different mixes in fixed proportions (e.g., water-to-cement ratio, air content, admixtures) along with varying concentrations of CNTs or CNFs were prepared. Different techniques commonly used for other materials (like polymers) were used in achieving uniform dispersion of nanofilaments in the cement paste matrix and strong nanofilament/cement bonding. Small-scale specimens were prepared for mechanical testing in order to measure the modified mechanical properties as a function of nanofilament concentration, type, and distribution. With 0.1% CNFs, the ultimate strain capacity increased by 142%, the flexural strength increased by 79%, and the fracture toughness increased by 242%. A scanning electron microscope was used to discern the difference between crack bridging and fiber pullout. Test results showed that the strength, ductility, and fracture toughness can be improved with the addition of low concentrations of either CNTs or CNFs.
Keywords Carbon nanofibers
Carbon nanotubes
Carbon Nanotubes(CNTs)
Concrete pavements
Nano reinforcements

Source Agency Department of Transportation Office of University Research
Texas Transportation Institute Texas A&M University
NTIS Subject Category 89C - Construction Management & Techniques
71 - Materials Sciences
50C - Construction Equipment, Materials, & Supplies
89G - Construction Materials, Components, & Equipment
Corporate Author Texas Transportation Inst., College Station.
Document Type Technical report
Title Note Technical rept.
NTIS Issue Number 1307
Contract Number DTRT07-G-0006

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