Micro-stress analysis and identification of lightweight aggregate鈥檚 failure strength by micromechanical modeling

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• 作者：Y. Ke ; S. Ortola ; A.L. Beaucour ; H. Dumontet
• 关键词：Lightweight aggregate concrete ; Failure strength ; Micro-mechanics ; Inverse problem ; Identification ; Homogenization
• 刊名：Mechanics of Materials
• 出版年：January, 2014
• 年：2014
• 卷：68
• 期：Complete
• 页码：176-192
• 全文大小：3792 K

文摘

This work is based on a dual approach of experiments and micromechanical modeling in order to characterize the failure behaviors of lightweight aggregate concretes (LWAC). Many classes of LWAC were tested, based on five families of lightweight aggregates (LWA) and three types of mortar matrices: normal, high performance (HP) and very high performance (VHP). Micromechanical modeling is based on an iterative homogenization approach and associated localization: local stress distributions during the uniaxial compression tests can be predicted in LWAC鈥檚 components and at their interface. Experimental compressive strengths were measured on manufactured 16 脳 32 cm cylindrical specimens. The confrontations between micromechanical modeling and experiments were used to identify LWA鈥檚 failure strengths which are difficult to measure, and to quantify the inaccuracies related to conventional methods. These corrected values of LWA鈥檚 failure strength were introduced into a failure criterion modeling: associated predictions of LWAC鈥檚 compressive strength are in good agreement with the experimental measurements.