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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Tension Test of Stress Versus Crack Opening Displacement Using Cylindrical Concrete Specimens
Author(s): L. R. Lenke and W. H. Gerstle
Publication: Special Publication
Appears on pages(s): 189-206
Keywords: concrete; crack opening displacement; direct tension;fracture energy; fracture mechanics; fracture toughness; stressintensity factor; tensile strength
Abstract:Many laboratory fracture toughness tests have been devised for quasi-brittle materials such as portland cement concrete (PCC). The objective of these tests has typically been to determine linear elastic fracture mechanics parameters such as fracture toughness, Kt,, and fracture energy, Gr. More recently, proposals have been developed to determine the parameters for a variety oftwo-parameter models. For example, the inelastic correction factor method requires parameters KI, and inelastic correction factor p, while the Jenq and Shah two-parameter model requires KI, and CTODc, and the Bazant size effect method requires Grand cr. All of these parameters can be obtained from the stress versus crack opening displacement (o-COD) relationship. The authors describe a test device that is reliable, simple to understand and analyze, relatively inexpensive. and can be used on standard 6-inch diameter by 12-inch concrete cylinders in a universal testing machine (UTM) under load control. This device, called the stiff tensile test (STT) apparatus, is used to obtain the complete versus COD relationship. From this o versus COD relationship, which is fundamental at the meso-scale, can be derived most of the commonly used fracture parameters of concrete.
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