PHYSICAL PROPERTIES OF CEMENT MORTARS EXPOSED TO HIGH TEMPERATURE IN VARIOUS COOLING CONDITIONS

Tensile strength of bending, compressive strength and porosity rate change of cement mortars exposed to high temperature were examined in this study. 100, 300, 500, 700 and 900 C degrees temperatures were applied to cement mortar samples. Cooling process were implemented in two ways as in air and in water. Tensile strength of bending, compressive strength and porosity rates of samples, which were cooled to laboratory temperature, were determined. Multiple linear regression modeling were made up by using the data from different temperatures and cooling conditions. Although there is an increase in tensile strength and compressive strength of mortar samples in 100 C degrees, after this temperature it was seen that there was a decrease tendency according to average temperature. According to cooling conditions it was observed that the tensile strength of bending of the samples that were cooled in air were decreased 29%, and that were cooled in water were decreased 58%; the compressive strength of the samples that were cooled in air was decreased 10%, and that were cooled in water were decreased 35%. Furthermore, it was observed that porosity rate of the samples that were cooled in air were increased 3.3%, and that were cooled in water were increased 9%.