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Direct and Flexural Tension Test Methods for Determination of the Tensile Stress-Strain Response of UHPC

Benjamin A. GraybealFrançois ToutlemondeFlorent BabyPierre Marchand

出版	Kassell University Press, 2012
URL	http://books.google.com.hk/books?id=0prMuQEACAAJ&hl=&source=gbs_api

註釋The tensile stress-strain response of Ultra-High Performance Concrete (UHPC) is a fundamental mechanical behavior, and knowledge of this response is necessary for appropriate use of the concrete. To date, test methods aimed as assessing this property have generally found limited application due to their complexity and impracticality when considered in terms of a commercial testing environment. A joint research effort recently completed by the U.S. Federal Highway Administration and the French IFFSTAR (formerly LCPC) has succeeded both in further advancing the field of flexure testing as well as in developing a novel, practical direct tension test method. In the case of the direct tension test, this method can be considered as a reference method as it directly reports the uniaxial tensile stress-strain response of the concrete both pre- and post-cracking without requiring the use of any complex stress or strain transformations. Additionally, the method can be completed relatively quickly through the use of commercially available mechanical testing equipment on cast or extracted specimens of cross-sectional dimension up 51 mm square. The paper and presentation will discuss the direct tension and flexure test methods, as well as results obtained from applying these tests to multiple UHPC-class materials.