Journal
MATERIALS AND STRUCTURES
Volume 46, Issue 12, Pages 2029-2043Publisher
SPRINGER
DOI: 10.1617/s11527-013-0034-4
Keywords
Image analysis; Microstructure; SEM; Fracture toughness; Concrete
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The interfacial-bonding, interfacial transition zone (ITZ), and porosity are regarded as the key factors affecting hardened concrete properties. The aim of this study was to experimentally improve the bonding between the rubber aggregate and cement paste by different methodologies including water washing, Na(OH) pre-treatment, and both cement paste and mortar pre-coating. All methods were assessed by determining mechanical and dynamic properties, then correlating this with ITZ porosity and interfacial gap void geometry, along with quantification of the fracture energy during micro crack propagation using fractal analysis. The results indicated that pre-coating the rubber by mortar gave the best results in terms of fracture toughness and energy absorption showing good agreement between observations made at both micro and macro scales.
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