Micromechanical Structure-Property Relationships for the Damage Analysis of Impact-Loaded Sustainable Concrete

• Published in: Journal of materials in civil engineering Vol. 25; no. 5; pp. 597 - 609
• Main Authors: Erdem, Savaş, Dawson, Andrew Robert, Thom, Nicholas Howard
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01.05.2013
• Subjects: Aggregates; Applied sciences; Building failures (cracks, physical changes, etc.); Buildings. Public works; Concretes; Concretes. Mortars. Grouts; Durability of constructions; Durability. Pathology. Repairing. Maintenance; Exact sciences and technology; General (composition, classification, performance, standards, patents, etc.); Gravel; Interferometers; Materials; Nanostructure; Pastes; Roughness; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; Sustainability; Technical Papers; Stress strain relation; Impact loading; Construction materials; Thermogravimetry; Concrete mix design; Micro and pore structure; Durability; Experimental study; Impact loads; X ray diffraction; Sustainable development; Micromechanics; Interfacial zone; Failure analysis; Damage mechanism; Properties of materials; Concrete; Microstructure; Damage; Loading test(mechanics); Impact test; Interface; Sustainable concrete
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000616

AbstractIn this study, quantitative microstructure-property relationships are mainly used to characterize the damage due to high-strain-rate impact loading and the mechanical behavior of concretes prepared by substituting natural aggregate (gravel) with recycled aggregates having different rigidities (blue brick and rubber). Based on the results obtained, a possible mechanism for microstructural damage in concrete is proposed. It is concluded that the aggregate causes a change in the initial interfacial transition zone (ITZ) condition, and it is this altered ITZ condition that has a major effect on overall mix behavior. The analysis also indicates that there is almost a linear correlation between the roughness values (Ra) of the region near the paste–aggregate interface and the dissipated surface fracture energy values of the specimens. Moreover, three-dimensional topographic images of the specimens constructed using a vertical nanotech scanning interferometer show that the paste region of the gravel specimen has the smoothest profile due to the relatively strong hydrated paste.