Investigation of high strength concrete quality and proposal of a new material coefficient

This study aims to gain insight into the quality of the high strength concrete manufactured in our country. The most important feature that determines the quality of the concrete is the its' compressive strength. For this reason, 7 and 28-day concrete compressive strength results have been used. The data used in the study were obtained from structural materials laboratories and concrete plants operating in the cities of Istanbul, Izmir, Adana, Bursa and Kahramanmaras. The data belonging to C40, C50, C60, C70 and C80 class concrete has been categorized in terms of concrete classes. Total of 24 buildings were examined. The average values, standard deviations and coefficient of variations are calculated using the compressive strength results of each building. In order to determine which distribution fits the data of concrete compressive strength; Kolmogorov-Smirnov and Chi-square distribution tests were applied by using the software named as EasyFit. Making an uncertainty analysis considering the results 1.55 coefficient of materials is proposed for high strength concrete. Keywords: Concrete, High strength concrete, Concrete compressive strength, Building security, Normal distribution, Uncertainty analysis