CURRENT GAPS IN DURABILITY ANALYSIS

Data related to durability of composites is still evolving. As composites are beginning to find increased usage in the construction industry, note that several of the available durability studies are validated over short-terms (typically from 1980 and beyond).

Most of the durability data have not been validated over a long-term duration, such as 50 to 100 years under field conditions. Available data on composite properties is influenced by durability test methods employed (type of exposure, concentration of salts and alkali, exposure methods), test conditions (temperature, humidity, specimen type and dimensions, rate of testing), variation in constituents (resins, fibers, addi-tives, cure conditions), and manufacturing issues (QA and QC). Data on durability is sometimes controversial due to the complexity of the synergistic action of a set of environmental loads and corresponding composite responses that may indicate conflicting trends in results. The Civil Engineering Research Foundation (CERF) has identified current gaps in durability analysis of composites used for construction based on the effects from exposure to moisture, alkali solution, temperature, creep/relaxation, fatigue, ultraviolet radiation, and fire [Karbhari et al. 2003]. The CERF document mainly presents information as a roadmap to generate and coordi-nate future efforts to establish an integrated knowledge system; a methodology for test protocols for generation of test data, collection of test data and validation; and the implementation of plans for correlating field data with laboratory test results.

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