Journal
CEMENT & CONCRETE COMPOSITES
Volume 34, Issue 10, Pages 1149-1158Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2012.06.017
Keywords
Modeled recycled aggregate concrete; Failure process; Uniaxial compression; Digital image correlation (DIC); Crack propagation
Funding
- National Natural Science Foundation of China [51178340]
- Kwang-Hua Foundation
- Shanghai Science and Technology Committee [10231202000]
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In order to investigate the failure processes of Recycled Aggregate Concrete (RAC), cracking behavior of modeled RAC specimens under compressive loading was investigated using Digital Image Correlation (DIC). Strain and displacement contour maps were produced to analyze the cracks' initiation and propagation during loading. The testing results indicate that the discrepancy between the elastic moduli of coarse aggregates and mortar matrix significantly influences the mechanical properties and crack patterns of the modeled materials. It is found that the failure process is related to the relative strength of coarse aggregate and mortar matrix. For modeled RAC, the first bond cracks appear around both the old and new interfacial transition zones (ITZ), and then propagate into the old and new mortar matrix by connecting each other. The observation implies that the initiations and propagations of microcracks are different between RAC and Natural Aggregate Concrete (NAC). The findings in this investigation are useful to improve the mechanical properties of RAC by optimizing the mix proportion. (C) 2012 Elsevier Ltd. All rights reserved.
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