Investigation of the effects of pyrolytic products made from used tires on the properties of rubber blends

In this study, it is aimed to get an idea about the quality of the concrete produced in our country and to find a new material coefficient factor for the concrete The most important feature that determines the quality of concrete is the compressive strength of concrete. For this reason, 7 and 28 days compressive strength results of concrete belonging to C20, C25, C30, C35 produced in 2014, 2015, 2016, 2017 and 2018 are examined. The data used in the study are obtained from concrete laboratories in Konya, Karaman, Niğde and Aksaray provinces. Mean values, standard deviations and coefficients of variation are calculated using the compressive strength results of each building. A total of 35693 samples, including 17463 samples from C20 concrete class, 8287 samples from C25 concrete class, 8501 samples from C30 concrete class, 1442 samples from C35 concrete class, are examined and analyzed with the help of SPSS 22 program. The data obtained shows that ready-mixed concrete sector can produce concrete at the desired level. In addition, uncertainty analysis are performed and the new material coefficient for normal strength concrete are proposed as 1.40.