Variation of In-Place Concrete Core Strength in Structures from Istanbul Area: Statistical Analysis of Concrete Core Data

Abstract

The research has been undertaken to determine the strength and quality of concrete material used to build various types of structures in various localities in the city of Istanbul, located within the first-degree disastrous area for a potential earthquake risk. Concrete core samples collected from a total of 244 structures (buildings, industrial, and governmental structures), for which the construction details, such as the production type (cast in place and/or ready mixed) and class of concrete material are known, have been tested for their compressive strength. Statistical analyses of the collected data show that the tested core samples have equivalent specified strength of between 1.61 and