Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Quality control and condition analysis through nondestructive testing in concrete is one of the important issues addressed by SHRP research program. The objective of the research performed herein is to present a methodoloy for development of a test method and apparatus to determine the amount of entrained air void system in freshly mixed concrete to facilitate acceptance or rejection in the field. The percentage of entrained air in freshly mixed concrete has been measured using the loss in light intensity outputs of thin optical fibers. Laboratory experiments were conducted for the development of a methodology. Reliability of results have been examined through experiments with air entrained concretes. The air content of concretes tested in this study ranged from 2 to 22 percent by volume. The fiber optic airmeter will be potentially useful in the determination of air void characteristics, particularly the distribution of entrained air system in freshly-mixed concretes. The consequences of the developed methodology will be the safeguard of concrete pavements against frost damage due to improperly air entrained mixtures, and therefore saving millions of dollars in highway rehabilitation costs. (Copyright (c) 1994 National Academy of Sciences.)
Quality control and condition analysis through nondestructive testing in concrete is one of the important issues addressed by SHRP research program. The objective of the research performed herein is to present a methodoloy for development of a test method and apparatus to determine the amount of entrained air void system in freshly mixed concrete to facilitate acceptance or rejection in the field. The percentage of entrained air in freshly mixed concrete has been measured using the loss in light intensity outputs of thin optical fibers. Laboratory experiments were conducted for the development of a methodology. Reliability of results have been examined through experiments with air entrained concretes. The air content of concretes tested in this study ranged from 2 to 22 percent by volume. The fiber optic airmeter will be potentially useful in the determination of air void characteristics, particularly the distribution of entrained air system in freshly-mixed concretes. The consequences of the developed methodology will be the safeguard of concrete pavements against frost damage due to improperly air entrained mixtures, and therefore saving millions of dollars in highway rehabilitation costs. (Copyright (c) 1994 National Academy of Sciences.)
Fiber-Optic Airmeter
F. Ansari (Autor:in)
1994
76 pages
Report
Keine Angabe
Englisch
Highway Engineering , Construction Equipment, Materials, & Supplies , Nondestructive Testing , Transportation & Traffic Planning , Transportation , Nondestructive tests , Air entrainment , Concrete pavements , Highway construction , Quality control , Fiber optics , Reliability , Concrete construction , Test methods , Voids , Road materials , Curing , Sensors , Signal analysis , Fiber optic airmeters
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