Imaging materials - Pictorial colour reflection prints - Comparison of image degradation observed between ISO 18930 accelerated weathering test method and outdoor exposure

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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The Research for the Aging Performance of Reflective Sheeting by Artificial Accelerated Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.361-363.2326 ◽

2013 ◽

Vol 361-363 ◽

pp. 2326-2329

Author(s):

Xue Feng Ma ◽

Wen Ying Su ◽

Dan Li ◽

Wei Wang

Keyword(s):

Test Method ◽

Accelerated Weathering ◽

Traffic Sign ◽

Accelerated Weathering Test ◽

Test Result ◽

Aging Performance

This paper researches the weathering performance of traffic sign reflective sheeting by artificial accelerated weathering test method. The microstructure image and the retro-reflective coefficient of reflective sheeting were obtained and discussed according to the test result. This paper summarized the aging regular.

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Weatherability of Polypropylene by Accelerated Weathering Tests and Outdoor Exposure Tests in Japan

Journal of Polymers ◽

10.1155/2016/6539567 ◽

2016 ◽

Vol 2016 ◽

pp. 1-14 ◽

Cited By ~ 7

Author(s):

Kenichi Shimizu ◽

Yuuki Tokuta ◽

Akihiro Oishi ◽

Takashi Kuriyama ◽

Masao Kunioka

Keyword(s):

Reference Sample ◽

Outdoor Exposure ◽

Accelerated Weathering ◽

Test Machine ◽

Exposure Test ◽

Average Temperature ◽

Outdoor Exposure Test ◽

Promotion Committee ◽

Accelerated Weathering Test ◽

The One

As a joint study of the Polymer Subcommittee in the Industrial Technology Cooperative Promotion Committee, in which members are Japanese local governmental research institutes and National Institute of Advanced Industrial Science and Technology (AIST, Japan), carried out from 2010 to 2012, polyethylene reference sample (PE-RS) pieces and six types of polypropylene (PP) were subjected to accelerated weathering tests and outdoor exposure tests, resulting in the following findings. (1) The PE-RS was subjected to eight 100 h exposure tests in the same test machine. The accelerated weathering test machines of the participating institutes had high reproducibility. (2) The PE-RS CI values were greater when the temperature in the chamber was greater during accelerated weathering tests, and there was a high correlation with the average temperature in the outdoor exposure tests at 20 places in Japan. (3) By comparing the change in PP strength by normalizing the degradation environment using the PE-RS CI values, the accelerated weathering test with results showing the highest correlation with the outdoor exposure test results was the one with the xenon arc lamp at an irradiance of 60 W/m2 and a BPT of 63°C.

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