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Drying cracks: Kinematics and scale laws
Abstract Natural drying of concrete specimens involves a desiccation shrinkage, which can produce significant cracking. The knowledge of its evolution may allow us to estimate the final configuration of the drying cracks. To achieve this, experiments with a micro-concrete have been performed. The visualisation of the cracking network at different ages of drying, and the recording of different types of shrinkage and of high humidity gradients near the surface could be carried out. One cubic test piece of 1 m side was manufactured, and a reliable procedure for studying the cracking process is shown. Also displayed is a strict method for analysing the geometrical characteristics of the crack network with the help of image analysis and some basic concepts of the Statistical Physics of Disorder. The influence of the drying element's dimensions is shown in an experimental model made with clay and sand. Among the results, two curves are particularly interesting: one translates the correlation between the initial dimensions of the drying elements and the final mean crack spacing, and another enables estimating the times of the beginning and end of the cracking development.
Drying cracks: Kinematics and scale laws
Abstract Natural drying of concrete specimens involves a desiccation shrinkage, which can produce significant cracking. The knowledge of its evolution may allow us to estimate the final configuration of the drying cracks. To achieve this, experiments with a micro-concrete have been performed. The visualisation of the cracking network at different ages of drying, and the recording of different types of shrinkage and of high humidity gradients near the surface could be carried out. One cubic test piece of 1 m side was manufactured, and a reliable procedure for studying the cracking process is shown. Also displayed is a strict method for analysing the geometrical characteristics of the crack network with the help of image analysis and some basic concepts of the Statistical Physics of Disorder. The influence of the drying element's dimensions is shown in an experimental model made with clay and sand. Among the results, two curves are particularly interesting: one translates the correlation between the initial dimensions of the drying elements and the final mean crack spacing, and another enables estimating the times of the beginning and end of the cracking development.
Drying cracks: Kinematics and scale laws
Colina, H. (author) / Acker, P. (author)
2000
Article (Journal)
English
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