Coatings with embedded particles to increase interfacial anchorage of steel and GFRP rebars in concrete

Theoretical background for an optical method is presented which makes it possible to distinguish unambiguously between voids and particles as light scattering sites in polymeric materials. Typical dependences of turbidity as a function of diameter of scattering elements, their volume fractions and also turbidity curves as a function of the wavelength of the incident light were calculated, based both on the Lorenz-Mie theory and the fluctuation theory. Such dependences calculated for polypropylene-containing voids on the one hand and particles, differing only slightly from the surrounding matrix in their refractive index, on the other hand, are markedly different. The most significant results are: (i) Turbidity is at least by two orders of magnitude larger for voids in comparison to embedded particles of ethylene-propylene (EPDM) rubber of the same size, concentration and at the same wavelength. (ii) The wavelength dependence of turbidity for EPDM particles and the inherent refractive index fluctuations in the polypropylene matrix is much steeper as compared to voids for all considered diameters (0.1-10 μm). Thus, the nature of stress whitening in complex polymeric materials can be determined from turbidity measurements.

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Thermal effects on GFRP rebars: experimental study and analytical analysis

Materials and Structures ◽

10.1617/s11527-009-9547-2 ◽

2009 ◽

Vol 43 (6) ◽

pp. 775-788 ◽

Cited By ~ 15

Author(s):

Abdelmonem Masmoudi ◽

Radhouane Masmoudi ◽

Mongi Ben Ouezdou

Keyword(s):

Experimental Study ◽

Thermal Effects ◽

Analytical Analysis ◽

Gfrp Rebars

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Field Durability Study of Vinyl-Ester–Based GFRP Rebars in Concrete Bridge Barriers

Journal of Bridge Engineering ◽

10.1061/(asce)be.1943-5592.0001315 ◽

2018 ◽

Vol 23 (12) ◽

pp. 04018094 ◽

Cited By ~ 10

Author(s):

Brahim Benmokrane ◽

Claude Nazair ◽

Marc-Antoine Loranger ◽

Allan Manalo

Keyword(s):

Vinyl Ester ◽

Concrete Bridge ◽

Gfrp Rebars

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Superconductivity of embedded lead nano particles in metallic and amorphous matrices

MRS Proceedings ◽

10.1557/proc-703-v13.22 ◽

2001 ◽

Vol 703 ◽

Author(s):

K. Chattopadhyay ◽

V. Bhattacharya ◽

A. P. Tsai

Keyword(s):

Transition Temperature ◽

Superconducting Transition Temperature ◽

Magnetic Measurements ◽

Microstructural Characterization ◽

Rapid Solidification Processing ◽

Nano Particles ◽

Superconducting Transition ◽

Solidification Processing ◽

Embedded Particles

ABSTRACTNanodispersed lead in metallic and amorphous matrices was synthesized by rapid solidification processing. The optimum microstructure was tailored to avoid percolation of the particles. With these embedded particles it is possible to study quantitatively the effect of size on the superconducting transition temperature by carrying out quantitative microstructural characterization and magnetic measurements. Our results suggest the role of the matrices in enhancement or depression of superconducting transition temperature of lead. The origin of this difference in behavior with respect to different matrices and sizes is discussed.

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DUCTILITY AND FLEXURAL BEHAVIOR OF ONE WAY CONCRETE SLABS REINFORCED WITH LOCAL GFRP REBARS: AN EXPERIMENTAL AND ANALYTICAL STUDY

ERJ. Engineering Research Journal ◽

10.21608/erjm.2014.66873 ◽

2014 ◽

Vol 37 (1) ◽

pp. 95-106

Author(s):

Sherif H. Al-Tersawy ◽

M.A. Ghanem

Keyword(s):

Analytical Study ◽

Flexural Behavior ◽

Concrete Slabs ◽

Gfrp Rebars

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Cubic microlattices embedded in nematic liquid crystals: a Landau-de Gennes study

ESAIM Control Optimisation and Calculus of Variations ◽

10.1051/cocv/2021093 ◽

2021 ◽

Author(s):

Razvan-Dumitru Ceuca

Keyword(s):

Free Energy ◽

Additional Term ◽

Energy Functional ◽

Free Energies ◽

Cubic Symmetry ◽

Surface Anchoring ◽

Free Energy Functional ◽

Different Types ◽

Embedded Particles ◽

Anchoring Energy

We consider a Landau-de Gennes model for a connected cubic lattice scaffold in a nematic host, in a dilute regime. We analyse the homogenised limit for both cases in which the lattice of embedded particles presents or not cubic symmetry and then we compute the free effective energy of the composite material. In the cubic symmetry case, we impose different types of surface anchoring energy densities, such as quartic, Rapini-Papoular or more general versions, and, in this case, we show that we can tune any coefficient from the corresponding bulk potential, especially the phase transition temperature. In the case with loss of cubic symmetry, we prove similar results in which the effective free energy functional has now an additional term, which describes a change in the preferred alignment of the liquid crystal particles inside the domain. Moreover, we compute the rate of convergence for how fast the surface energies converge to the homogenised one and also for how fast the minimisers of the free energies tend to the minimiser of the homogenised free energy.

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