Türk, AyşeKeskin, Ülkü SultanTürk, Furkan2024-11-192024-11-192023978-605-81854-7-0https://hdl.handle.net/20.500.13091/6620Purpose: As a result of two earthquakes with a magnitude of 7.8 Mw and 7.5 Mw, the epicenter of which was Kahramanmaraş on February 6, 2023, many buildings were severely damaged or collapsed. Considering the findings obtained from these buildings, it is aimed to emphasize the importance of maximum aggregate particle diameter and aggregate surface geometry in terms of concrete strength. Study design/methodology/approach: The city of Hatay, one of the provinces affected by the earthquake, was visited and images were obtained from the debris. The causes of aggregate-induced defects in the obtained images were examined in the light of the literature. Findings: Based on the available literature, it was concluded that coarse aggregate properties play a major role in stress transmission, crack growth rate and fracture mechanisms, strain against damage, tensile and compressive strength in concrete. Aggregate size and surface geometry are the parameters that determine the thickness and continuity of the interface transition zone (ITZ). ITZs around large aggregates accelerate crack development, while discontinuous ITZs around small aggregates do not affect crack development. Also, in case of larger aggregate particle size, the amount of unhydrated cement particles in the ITZ is lower and the amount of water in the aggregate surface area is greater, resulting in higher porosity and a lower quality ITZ. Aggregate surface geometry, which is another critical aggregate property, greatly affects the adherence between aggregate and cement matrix. Originality/value: In the buildings destroyed and damaged in the 6 February earthquakes, the aggregate shape and maximum particle size were not taken into account during the design phase, and it was revealed by the images obtained from the earthquake zone. The reasons for the errors caused by the aggregate defects are explained.eninfo:eu-repo/semantics/openAccessAggregateEarthquakeInternal Transition ZoneAdherenceStrengthConference Object