New Surface-Treatment Technique of Concrete Structures Using Crack Repair Stick with Healing Ingredients

AbstractHydrophobic property of PDMS surface was improved by the 400 W UV-Vis lamp light irradiation in the atmospheric condition for several ten minutes. As a result of this surface treatment, the surface became to hydrophilic character for one month long. This surface treatment technique applied to PDMS micro-fluidic device and verified valve-less switching. The UV-Vis light irradiated to PDMS micro fluidic pattern with partly covered by aluminum foil. Finally inlet and outlets were connected 0.5 mm diameter tubes. The syringe pumps injected the distilled water into the inlet of the PDMS micro channel at the flow rates of 0.5, 5.0, and 50 μl/min for the both width channel. As results of water injection water flowed only the UV-Vis treated channel at the flow rates of 0.5 and 5.0 μl/min. On the other hand, the water flowed for all channels at the flow rate of 50 μl/min. This result was observed from 5.0 μl/min flow again for both width devices which dried by air. These results were occurred by the difference of the flow conductance and wettability. The mechanism of this hyrophilicity of PDMS was reported to form Si-O in the surface by means of glassy surface. From the IR spectra, the Si-O-Si peak shifted to higher wave number for UV-Vis irradiated PDMS than the untreated PDMS comparing with the other IR peaks. This result showed that the Si-O-Si network bonding of PDMS changed to the O-Si-O bonding around the surface.

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A Process Model for Laser Surface Treatment of Plasma Sprayed Coatings

Heat Transfer, Volume 2 ◽

10.1115/imece2004-59969 ◽

2004 ◽

Author(s):

J. Wu ◽

J. Choi ◽

S. Zhang ◽

G. Hilmas

Keyword(s):

Surface Roughness ◽

Surface Treatment ◽

Process Model ◽

Laser Surface ◽

Treatment Technique ◽

Beam Diameter ◽

Laser Surface Treatment ◽

Coating Quality ◽

Porosity Level ◽

Plasma Sprayed

Advanced ceramics are not easily fabricated and consolidated by the plasma spray technique because of their extremely high melting temperature. Zirconium diboride (ZrB2) has been successfully plasma sprayed, but the coatings are quite porous. The high levels of porosity are usually a result of unmelted ZrB2 particles that have been incorporated into the coating during deposition. Applying a laser surface treatment to reduce both the porosity and the coating surface roughness, and to improve the coating quality, is of great interest. A laser based surface treatment technique provides a well-controlled heat input, with minimal or no distortion. In this study, a two dimensional mathematical model is developed to investigate the effects of laser power, beam diameter and level of porosity on the coating quality, incorporating melting, solidification, and evaporation phenomena. A continuum model is used to solve Navier-Stokes equations for both solid and liquid phases. Volume-of-Fluid (VOF) is incorporated to track the free surface. The surface force is incorporated as a body force instead of a boundary condition. The porosity level and surface roughness before and after the laser surface treatment are simulated and compared with experimental results.

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Influence of Silane Treatment on the Freeze-Thaw Resistance of Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.565 ◽

2011 ◽

Vol 250-253 ◽

pp. 565-568 ◽

Cited By ~ 1

Author(s):

Xiao Jian Gao ◽

Hong Wei Deng ◽

Ying Zi Yang

Keyword(s):

Surface Treatment ◽

Water Adsorption ◽

Concrete Structures ◽

Air Entrainment ◽

Concrete Surface ◽

Silane Treatment ◽

Cold Regions ◽

Bonding Force ◽

Freeze Thaw ◽

Surface Impregnation

The influences of silane impregnation on water adsorption, bonding force between ice and concrete surface and resistance to freeze-thaw of concretes were studied. Two strength grades (C30 and C50) and the air entrainment were considered for concrete preparation. The results show that surface impregnation with silane reduces the final water adsorption of concrete by more than 90% when compared with the untreated specimen. The silane treatment significantly decreases the bonding force between ice and concrete surface. The resistance to freeze-thaw of both new and old concretes can be improved by the silane treatment. Therefore, the surface treatment with silane is suggested as an effective method to improve the durability of concrete structures in cold regions.

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Influência de materiais de proteção na resistividade elétrica do concreto

Revista ALCONPAT ◽

10.21041/ra.v2i1.26 ◽

2012 ◽

Vol 2 (1) ◽

pp. 46-56

Author(s):

M. S. Santor ◽

A. L. G. Gastaldini ◽

C. Crauss ◽

G. T. Dos Santos ◽

F. C. Rossini

Keyword(s):

Electrical Resistivity ◽

Surface Treatment ◽

Protective Action ◽

Concrete Structures ◽

Concrete Durability ◽

Surface Protection ◽

Different Types ◽

Polymer Mortar ◽

Durability Of Concrete

RESUMOA durabilidade das estruturas de concreto armado é resultado da ação protetora do concreto sobre a armadura. Quando a passivação do aço deixa de existir a estrutura torna-se vulnerável ao fenômeno da corrosão, cuja propagação, após iniciada é essencialmente controlada pela resistividade elétrica do concreto. O objetivo deste trabalho foi avaliar a alteração na resistividade elétrica de concretos produzidos com diferentes tipos de cimento, CP II F, CP IV e CP V, submetidos a tratamento superficial com produto obturador dos poros e argamassa polimérica. Para efeito de análise os resultados foram comparados com os mesmos concretos sem aplicação do produto. Esses tratamentos foram realizados em concretos confeccionados com resistências à compressão na idade de 28 dias de 21,6MPa, 26,6 MPa e 31,6 MPa. Para todos os tipos de cimento utilizados e níveis de resistência adotados o tratamento superficial com argamassa polimérica resultou em maiores valores de resistividade elétrica.Palavras chave: Concreto; durabilidade; material de proteção superficial; resistividade elétrica.ABSTRACTThe durability of concrete structures is a result of the protective action of concrete on the reinforcement. When there is no passivation of steel, the structure becomes vulnerable to corrosion, and once corrosion starts its propagation is essentially controlled by the electrical resistivity of concrete. The objective of this study was to evaluate the change in electrical resistivity of concretes produced with different types of cement: CP II F, CP IV and CP V that were surface-treated with pore filler and polymer mortar. For analysis purposes, the results were compared with those of the blanks that were not subjected to surface treatment. These treatments were performed in concretes with the following compressive strengths at the age of 28 days: 21.6 MPa, 26.6 MPa and 31.6 MPa. For all types of cement used and strengths adopted, surface treatment with polymer mortar led to higher electrical resistivity values.Key words: Concrete; durability; surface protection material; electrical resistivity.

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Development of Surface Treatment Technique With Photolytic Macromolecule Including RGDS Peptide

Volume 3: Biomedical and Biotechnology Engineering ◽

10.1115/imece2016-66466 ◽

2016 ◽

Author(s):

Y. Taki ◽

Y. Morita ◽

S. Nishimura ◽

A. Hirata ◽

T. Koga ◽

...

Keyword(s):

Surface Treatment ◽

Polymer Film ◽

Propionic Acid ◽

Polymer Films ◽

Radical Copolymerization ◽

Adhesive Property ◽

Ultraviolet Rays ◽

Treatment Technique ◽

Cell Adhesive ◽

Spin Coater

Arg-Gly-Asp-Ser (RGDS) coating is one of effective methods to improve the cell adhesive property of the scaffold surface. However, it is difficult to regulate the RGDS quantity and distribution, and to visualize RGDS distribution. The purpose of this study was to develop a surface treatment technique that the RGDS quantity can be regulated with the ultraviolet rays irradiation and the RGDS distribution can be visualized with the fluorescence. P(MMA-g-ANP-RGDS) and P(HEMA-g-ANP-RGDS) were respectively synthesized by radical copolymerization of methylmethacrylate (MMA) and 2-hydroxyethylmethacrylate (HEMA) with peptide-macromonomer containing photo-labile linker (3-amino-3-(2-nitrophenyl)propionic acid (ANP)) and RGDS. Each polymer film was produced by using spin-coater, and then ultraviolet rays was irradiated to the each film through the glass mask with three different ultraviolet rays transmissivity of 0 %, 30 % and 60 %. In both polymer films, the RGDS quantity can be regulated by ultraviolet rays irradiation, and the luminance decreased same as the RGDS quantity. Adherent osteoblast-like cells were not observed on P(HEMA-g-ANP-RGDS) film, but the number of adherent osteoblast-like cells was increased with increasing the RGDS quantity on the P(MMA-g-ANP-RGDS) film. In conclusion, we accomplished to develop the surface treatment technique with P(MMA-g-ANP-RGDS) to regulate and visualize the RGDS quantity and distribution.

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