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OCR for page 1
Executive Summary
in the next several decades, a significant percentage of the country's
transportation, communications, environmental, and power system infrastructures,
as well as public buildings and facilities, will have to be renewed or replaced.
Next-generation infrastructure will have to meet very high expectations in terms
of durability, constructability, performance, and life-cycle cost. One way of
meeting future expectations will be through improved, high-performance
materials, but before new materials can be confidently deployed in the field, a
thorough and comprehensive understanding must be developed of their long-term
performance in a variety of applications and physical environments.
The National Science Foundation (NSF) has launched an initiative to
promote the development of innovative short-term laboratory or in-situ tests for
making accurate, reliable predictions of the long-term performance of materials
and requested that the National Research Council (NRC) conduct a workshop as a
reconnaissance-level assessment of models and methods that are being used, or
potentially could be used, to determine the Tong-term performance of
infrastructure materials and components.
The objectives ofthe workshop were to:
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 identify gaps and overlaps in
research activities
establish outcome-oriented metrics for setting research priorities
identify promising lines of research and collaborations
As a result of the discussions at the workshop and the committee's
deliberations, the committee appointed by the NRC to conduct the workshop
believes that NSF should develop mechanisms (~) to promote the materials-based
issues associated with the life prediction and reliability of infrastructure in order
to attract the interest of scientists at the forefront of the study of complexity in
materials research and (2) to foster collaborations among scientists and engineers
engaged in life prediction and accelerated testing to encourage the transfer of
knowledge, methods, and techniques among various fields and applications.
The workshop discussions revealed a general agreement that the "root
cause" of the deterioration and failure of any system is related to materials and
that fault trees, risk analysis, and other related methods should be used to identify
the most important degradation mechanisms. Accelerated-testing methods could
potentially be used to rank the performance of materials in a real-worId system
but are not, at present, sufficiently reliable to make system-life predictions.
The committee concluded that a reasonable objective for infrastructure-
based research is to develop methodologies for predicting the total and remaining
life of a structure and that NSF should support materials research directed toward
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2
RESEARCHAGENDA FOR TESTMETHODSAND MODELS
understanding the combined effects of degradation mechanisms and applying that
understanding to quantitative predictions of system life.
Life-prediction models and accelerated-testing procedures have the
potential to increase the deployment of new materials in infrastructure
applications and to improve traditional materials. The government and
professional organizations will play major roles in encouraging the acceptance of
new materials.
Representative terms from entire chapter:
accelerated testing
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