Application of 3D-DIC to characterize the effect of aggregate size and volume on non-uniform shrinkage strain distribution in concrete |
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| Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, China;2. School of Materials Science and Engineering, Southeast University, Nanjing, China;1. Université de Bordeaux, I2M UMR 5295, Institut de Mécanique et d’Ingénierie, Dept. Génie Civil et Environnemental (GCE), Bordeaux F-33000, France;2. Université de Pau et des Pays de l’Adour, SIAME EA 4581, Laboratoire des sciences de l’ingénieur appliquées à la mécanique et au génie electrique, Allée du Parc Montaury, Anglet 64600, France |
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| Abstract: | To elucidate the effect of aggregate size and volume on the non-uniform strain distribution in concrete, drying shrinkage of mortar and concretes were determined with 3D digital image correlation (3D-DIC). The distribution of shrinkage displacements and strains in mortar and concrete were analyzed. The results show that 3D-DIC makes it possible to measure non-uniform displacement distributions initiated by shrinkage in mortar and concrete. The non-uniformity became more remarkable with drying time. The presence of aggregates larger than 5 mm in concrete have locally changed the displacement and strain fields. Aggregates within 5–25 mm make non-uniform strain of concrete more fluctuant, especially when the aggregate size is larger than 10 mm. The maximum and minimum principal strain distributions became more heterogeneous with decreasing volume of aggregates. |
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| Keywords: | 3D digital image correlation Full-field Concrete Aggregate |
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