Defect Identification and Acceptance of FRP and FRCM Masonry Reinforcement by Infrared Thermography Survey

2014 ◽  
Vol 624 ◽  
pp. 80-87
Author(s):  
Riccardo Angiuli ◽  
Paolo Corvaglia ◽  
Alessandro Largo ◽  
Angela Coricciati
Keyword(s):  
Infrared Thermography ◽  
Diagnostic Technique ◽  
Masonry Structures ◽  
Defect Identification ◽  
Cementitious Matrix ◽  
Partial Repair ◽  
Experimental Campaign ◽  
Reinforced Plastic ◽  
Different Types

Masonry structures, both historic and newly built, often need reinforcement interventions to meet new or increased loads or in the case of adjustment against seismic actions. The result of this type of intervention must be verified or tested to ensure the correspondence between what was originally designed and what was realized. In addition to numerous destructive and semi-destructive techniques, infrared thermography (IRT) is a contactless diagnostic technique which can rapidly provide information about the success of such reinforcement interventions, even on masonry structures. In the present work an experimental campaign to evaluate the effectiveness of IRT in identifying different types of defects that can be found on different reinforcement systems (FRP, Fibre-reinforced plastic, or FRCM, Fibre Reinforced Cementitious Matrix) for masonry structures has been performed. A thermographic survey was repeated even after repair works on the defects in order to identify a procedure of acceptance that can also be used on areas subject to total or partial repair.

scholarly journals Effect of Different Environments’ Conditioning on the Debonding Phenomenon in Fiber-Reinforced Cementitious Matrix-Concrete Joints

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7566
Author(s):  
Salvatore Verre
Keyword(s):  
Water Environment ◽  
Hot Water ◽  
Fiber Reinforced ◽  
Shear Tests ◽  
Cementitious Matrix ◽  
Direct Shear Tests ◽  
Number Of Layers ◽  
Experimental Campaign ◽  
Different Types ◽  
Concrete Joints

This paper presents the results of an experimental study conducted to understand the bond capacity through single-lap, direct-shear tests of fiber-reinforced cementitious matrix (FRCM)-concrete joints under an alkaline and hot water environment. The experimental campaign was focused on a FRCM system equipped with two different types of fibers, (PBO) and Carbon. After the conditioning, the specimens conditioned were subjected to visual inspection, and the experimental results were compared with the unconditioned specimens. Moreover, in this present work, the number of layers and the conditioning time were varied.

Application of infrared thermography to assess the effect of different types of environmental enrichment on the ocular, auricular pavilion and nose area temperatures of weaned piglets

2019 ◽  
Vol 156 ◽  
pp. 33-42 ◽  
Author(s):  
Ariadna Yáñez-Pizaña ◽  
Daniel Mota-Rojas ◽  
Ramíro Ramírez-Necoechea ◽  
Manuel Castillo-Rivera ◽  
Patricia Roldán-Santiago ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Environmental Enrichment ◽  
Weaned Piglets ◽  
Different Types

Experimental analysis on tensile and bond properties of PBO and aramid fabric reinforced cementitious matrix for strengthening masonry structures

2017 ◽  
Vol 127 ◽  
pp. 175-195 ◽  
Author(s):  
Carmelo Caggegi ◽  
Francesca Giulia Carozzi ◽  
Stefano De Santis ◽  
Francesco Fabbrocino ◽  
Francesco Focacci ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Masonry Structures ◽  
Bond Properties ◽  
Cementitious Matrix ◽  
Aramid Fabric ◽  
Fabric Reinforced Cementitious Matrix

scholarly journals Hand-Arm Vibration Assessment and Changes in the Thermal Map of the Skin in Tennis Athletes during the Service

2019 ◽  
Vol 16 (24) ◽  
pp. 5117 ◽  
Author(s):  
Ana M. Amaro ◽  
Maria F. Paulino ◽  
Maria A. Neto ◽  
Luis Roseiro
Keyword(s):  
Infrared Thermography ◽  
Tennis Elbow ◽  
Health And Safety ◽  
Lateral Epicondylitis ◽  
Biomechanical Analysis ◽  
Tennis Players ◽  
Safety Requirements ◽  
European Directive ◽  
Risk Of Injury ◽  
Different Types

During recent years the number of tennis athletes has increased significantly. When playing tennis, the human body is exposed to many situations which can lead to human injuries, such as the so-called tennis elbow (lateral epicondylitis). In this work a biomechanical analysis of tennis athletes, particularly during the service, was performed, considering three different types of over-grip and the presence of one anti-vibrator device. One part of the study evaluates the exposure to hand-arm vibration of the athlete, based on the European Directive 2002/44/EC concerning the minimum health and safety requirements, regarding the exposure of workers to risks from physical agents. The second part of the study considers an infrared thermography analysis in order to identify signs of risk of injury, particularly tennis elbow, one of the most common injuries in this sport. The results show that the presence of the anti-vibrator influences the vibration values greatly in the case of athletes with more experience and also for athletes with less performance. The presence of the Cork and/or Tourna on the racket grip does not have any significant effect on the hand-arm vibration (HAV), similarly in the case of athletes with the best performance and athletes with less technique. The results indicated that the infrared thermography technique may be used to identify the risk of injuries in tennis players.

Modeling and experimental implementation of infrared thermography on concrete masonry structures

2015 ◽  
Vol 69 ◽  
pp. 228-237 ◽  
Author(s):  
Fuad Khan ◽  
Mohammad Bolhassani ◽  
Antonios Kontsos ◽  
Ahmad Hamid ◽  
Ivan Bartoli
Keyword(s):  
Infrared Thermography ◽  
Masonry Structures ◽  
Concrete Masonry ◽  
Experimental Implementation

scholarly journals An Approach Method to Evaluate Wood Emissivity

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Rui Pitarma ◽  
João Crisóstomo
Keyword(s):  
Infrared Thermography ◽  
Diagnostic Technique ◽  
Environmentally Sustainable ◽  
Built Heritage ◽  
Approach Method ◽  
Useful Life ◽  
Wooden Structures ◽  
Emissivity Measurements ◽  
Environmental Importance

Throughout the ages, wood has been used in constructions. Therefore, most of the built heritage is made with wooden structures. Wood is a renewable, versatile, long-lasting, and environmentally sustainable material. It is comfortable, is aesthetically very valued, and has crucial environmental importance. Thus, being a widely used long-life material, it requires techniques for monitoring its state of integrity. Inspection needs to be done in production, in the work site, and during its useful life. Infrared thermography (IRT) is a nondestructive, noninvasive, noncontact diagnostic technique. It evaluates the surface temperature of objects based on the emitted radiation. Nevertheless, the accurate measurement of temperature is strongly dependent on the emissivity value of the material. This paper presents an expedite method to measure wood emissivity values, using active infrared thermography. Wood samples of the Pinus pinaster species were used in the experiments. The thermal contrast of the samples was performed by applying three different heating methods: conduction, convection, and radiation. The emissivity values of the three tests were compared with each other and with data from the literature, showing satisfactory results and validating the presented methodology. The procedure can also be adopted, with some adjustments, to other materials and in situ analysis, contributing to emissivity measurements.

Chemical by-Product Diagnostic Technique for Gas Insulated Switchgear Condition Monitoring

2017 ◽  
Vol 7 (1) ◽  
pp. 18 ◽  
Author(s):  
Visa Musa Ibrahim ◽  
Zulkurnain Abdul-Malek ◽  
Nor Asiah Muhamad
Keyword(s):  
Condition Monitoring ◽  
Electromagnetic Interference ◽  
Diagnostic Technique ◽  
High Sensitivity ◽  
Cost Effective ◽  
Health Condition ◽  
Artificial Defect ◽  
Gas Insulated Switchgear ◽  
Different Types ◽  
By Products

<p>Chemical by product diagnostic technique is an efficient, cost-effective and reliable diagnostic technique for gas insulate switchgear condition monitoring in view of its high sensitivity and anti- internal and external electromagnetic interference and noise. In this research paper, coaxial simulated gas insulated switchgear chamber and four different types of artificial defect were designed to cause partial discharge that will simulate the decomposition of sulphur hexafluoride gas in the chamber when energize. Fourier transform infrared spectrometer was used as the method of chemical by-product technique to detect the SF<sub>6</sub> decomposition product and its concentration. Different numerous by-products were detected (SO<sub>2</sub>, SOF<sub>2</sub>, SO<sub>2</sub>F<sub>2</sub>, SO<sub>2</sub>F<sub>10</sub>, SiF<sub>4</sub>, CO, C<sub>3</sub>F<sub>8</sub>, C<sub>2</sub>F<sub>6 </sub>) under this experiment using four different types of defect and the by-products differs with the type of defect and the generation rate. Gas insulated switchgear health condition can be feasibly diagnosed by analyzing the decomposition products of SF<sub>6</sub> to identify its fault.</p><p> </p>

scholarly journals Lifetime Glass Reinforced Plastic Pipes by Measuring the Stiffness

2018 ◽  
Vol 8 (1) ◽  
pp. 7-12
Author(s):  
Ana Diana Ancas ◽  
M. Profire ◽  
I. L. Cirstolovean ◽  
M. Hornet ◽  
G. Cojocaru
Keyword(s):  
Mechanical Characteristics ◽  
Safe Operation ◽  
Plastic Pipes ◽  
Reinforced Plastic ◽  
Three Samples ◽  
Different Types ◽  
Deformation Speed ◽  
Deformation Force ◽  
Length Of Life

Abstract The lifetime of glass reinforced plastic pipes is 50 years. Extensive use of this type of pipe in its various applications, led to investigate their behavior in land that anthropogenic or natural causes, shows the different values of pH to neutral. The paper presents experimental results conducted on three samples of a PN SN10000 DN150 PN10 pipe buried in three different types of terrain: neutral, acidic, basic. They were subjected to axial load, measuring the force applied deformation force function. On the basis of the calculation formulas determined rigidity of the pipeline, the deformation speed of 50 mm / min. This concludes the type of land affects the rigidity of the pipe so its length of life decreases to that provided by suppliers in order to be taken compensatory measures in this regard such as choosing a higher class of pressure and stiffness pipeline than those arising discounted. This will allow for long-term value (50 years) in the mechanical characteristics sufficient for safe operation.

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