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LOCALIZATION PHENOMINA AND FRACTURE ENERGY OF CONCRETE AT EARLY AGES

Pages: 65 to 74

Fawzy.  M. A. El_Behairy

Abstract:

Several experimental studies have been done long time ago to calculate the fracture energy of concrete [2, 6].  Most of these studies neglected the loss of energy due to the frictional process in the mechanism of experimental set up. All these studies have used the indirect tensile testing method, as a suitable approach for determining the fracture energy of concrete of mature age [3, 7]. However all these experimental studies have not investigated the crack or the localization process of young age concrete yet. So, to study the fracture and localization process at early ages of concrete, this experimental investigation study is done. Fracture energy for concrete at early ages is estimated experimentally considering the weather of Kingdom of Saudi Arabia. The specimens at early age are tested to calculate the fracture energy of concrete using a direct tension test, taking into consideration the loss of energy due to the frictional process in the mechanism of experimental set up. Also the crack localization is considered during the experiment, as dealing with the localized fracture. In this experimental work, the measurements reach to the post peak softening branch of concrete using the direct tension.  The results show that there is a fairly good agreement between the experimental results and the numerical output using the Modified Lattice Model[9,10,11]. 

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