Research Agenda for Test Methods and Models to Simulate the Accelerated Aging of Infrastructure Materials Report of a Workshop (1999) / Chapter Skim
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1 Workshop Synopsis and Committee Findings and Recommendations
1 Workshop Synopsis and Committee Findings and Recommendations
Pages 3-11
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From page 3... ...
One way of meeting future expectations will be through improved, highperformance materials, but many barriers to the use of new materials in infrastructure will have to be overcome. Because infrastructure materials must perform in a complex physical environment defined by nonlinear relationships between multiple variables, a thorough and comprehensive understanding must be developed of their long-term performance in a variety of applications and physical environments before they can be confidently deployed in the field.
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From page 4... ...
The objectives of the workshop are listed below: define the objectives for infrastructure-based research that would use accelerated testing and computational simulations to determine life-cycle performance assess the state of the knowledge base to identliFy gaps and overlaps in research activities establish outcome-oriented metrics for setting research priorities identify promising lines of research and collaborations ORGANIZATION OF THE WORKSHOP The Workshop to Develop a Research Agenda for Test Methods and Models to Simulate Accelerated Aging of infrastructure Materials was held on August 24 and 25, 199S, at the NRC in Washington, D.C. In addition to the committee, the workshop was attended by 25 experts from academia, government, and industry who were chosen for their familiarity with life-prediction and accelerated-testing methods and represented a broad range of disciplines and perspectives.
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From page 5... ...
The observations, findings, and recommendations for further research that follow are based on discussions facilitated by the workshop and the knowledge and experience of committee members. This report does not purport to be a comprehensive state-of-the-art assessment; rather, it represents the consensus of the committee regarding what was learned at the workshop and is intended to guide NSF in setting research priorities and evaluating proposals received in response to its Durability Initiative.
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From page 6... ...
, the prognosis for dealing, on a fundamental level, with complexities such as life prediction in real environments are very limited if they are based solely on the capabilities of traditional materials science. Many participants were optimistic about the future of infrastructure materials research because of significant advances in instrumentation and analytical capability on the experimental side and a dramatic improvement in the simulation of material properties on the theoretical side.
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From page 7... ...
There was little evidence presented at the workshop, however, that this is being done in other areas. Many materials studies provide exquisite detail of how chemical and physical changes occur in specific laboratory environments, but these data cannot always be related directly to system behavior in a real-world environment.
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From page 8... ...
. Properly constructed computational simulation models can account for the effects of uncertainty not only in materials behavior but also in environmental and other conditions.
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From page 9... ...
Materials studies should be closely coordinated with system applications, and continuous comparisons of field data with laboratory data should be used to validate results. One way of facilitating this comparison is by using analytical characterization tools to quantify relevant micro structural and compositional aspects of accelerated-testing results and field-returned material.
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From page 10... ...
Accelerated-testing methodologies must have the following characteristics: . · faithful replication of the processes that occur in practice, based on a thorough understanding of all of the possible degradation mechanisms, their kinetics, and the effects of their interactions the flexibility to evaluate multiple factors and identify those that should be the focus of future research · the ability to account for scaling effects to ensure that laboratory results reflect true environments the ability to account for the possible effects of the infrastructure application, design, and quality of construction, all of which can significantly affect lifetimes · monitoring of all environmental variables (e.g., temperature, humidity, ultraviolet exposure)
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From page 11... ...
and the engineers' exposure to risk, the validity of models and test methods w~11 have to be proven over a wide range of applications, materials, and environmental conditions before their results will be widely accepted in the engineering community. The government and professional organizations will play major roles in encouraging the acceptance of new materials through the use of life-prediction models and accelerated testing.
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