Cumulative Light Intensity of Automotive Glass: A Comparative Study on Combination of Optical Filter for Accelerated Weathering Test

2019 ◽  
Vol 20 (4) ◽  
pp. 755-762
Author(s):  
Eun Hee Jo ◽  
Il Han Kim ◽  
In-Soo Han ◽  
Chang Hwan Kim
Keyword(s):  
Light Intensity ◽  
Comparative Study ◽  
Optical Filter ◽  
Accelerated Weathering ◽  
Accelerated Weathering Test

Exposure of Polymeric Glazing Materials Using NREL’s Ultra-Accelerated Weathering System (UAWs)

2010 ◽  
Author(s):  
Carl Bingham ◽  
Gary Jorgensen ◽  
Amy Wylie
Keyword(s):  
Light Intensity ◽  
Thermal Effects ◽  
Outdoor Exposure ◽  
Exposure Chamber ◽  
Accelerated Weathering ◽  
Intensity Level ◽  
Design And Implementation ◽  
Different Temperatures ◽  
Exposure Testing ◽  
Ultraviolet Irradiance

NREL’s Ultra-Accelerated Weathering System (UAWS) selectively reflects and concentrates natural sunlight ultraviolet irradiance below 475 nm onto exposed samples to provide accelerated weathering of materials while keeping samples within realistic temperature limits. This paper will explain the design and implementation of the UAWS which allow it to simulate the effect of years of weathering in weeks of exposure. Exposure chamber design and instrumentation will be discussed for both a prototype UAWS used to test glazing samples as well as a commercial version of UAWS. Candidate polymeric glazing materials have been subjected to accelerated exposure testing at a light intensity level of up to 50 UV suns for an equivalent outdoor exposure in Miami, FL exceeding 15 years. Samples include an impact modified acrylic, fiberglass, and polycarbonate having several thin UV-screening coatings. Concurrent exposure is carried out for identical sample sets at two different temperatures to allow thermal effects to be quantified along with resistance to UV.

Surface roughness and color characteristics of wood treated with preservatives after accelerated weathering test

2005 ◽  
Vol 250 (1-4) ◽  
pp. 35-42 ◽  
Author(s):  
Ali Temiz ◽  
Umit C. Yildiz ◽  
Ismail Aydin ◽  
Morten Eikenes ◽  
Gry Alfredsen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Accelerated Weathering ◽  
Color Characteristics ◽  
Accelerated Weathering Test

Ethylene Glycol Accelerated Weathering Test: An Improved, Objective Aggregate Durability Test Method

2017 ◽  
Vol 2655 (1) ◽  
pp. 27-35
Author(s):  
Petrus G. L. van Blerk ◽  
Enrico Fletcher ◽  
Seosamh B. Costello ◽  
Theuns F. P. Henning
Keyword(s):  
Ethylene Glycol ◽  
Clay Minerals ◽  
Road Construction ◽  
Test Methods ◽  
Test Method ◽  
Accelerated Weathering ◽  
Visual Interpretation ◽  
Durability Test ◽  
Spalling Fracture ◽  
Accelerated Weathering Test

Ethylene glycol has been used extensively by the concrete and road construction industries to identify rock durability issues associated with smectite clay minerals. The presence of these clay minerals is synonymous with rock degradation under normal environmental wetting and drying cycles. However, such historical test methods are predominately based on a subjective visual interpretation, describing the observed degradation of individual rock pieces at fixed time intervals during the soaking process. In addition, some test methods include complex equations with multiple weighting factors applied to nominated degradation descriptors (e.g., spalling, fracture, and disintegration) used to calculate a single durability indicator. This paper describes the development and implementation of an alternative, nonsubjective accelerated weathering test that also uses ethylene glycol. The research included metamorphic and volcanic rock types used extensively in New Zealand for road construction. The greatest benefit of the proposed new test method is the ability to eliminate the subjective visual assessment described in historical test methods and adequately quantify results to specify contractual acceptance and rejection criteria. The test method also shows that good repeatability is possible from duplicate test samples. However, rock quality and quarry production consistency will influence the ability of the test method to report the same “percentage change in fines” over a prolonged test period. This phenomenon was particularly evident with problematic and lower quality rock. The test findings are well supported by observed field performance, thus giving confidence in the new method’s usefulness.

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