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Fire events in buildings cause changes in the behavior of concrete and the components in it. In general, concrete materials are relatively more fire resistant than wood and plastic, as well as steel. However, to provide significant durability performance against fire, several requirements are still needed for adequate post burn concrete durability. The composition of concrete constituents is very important to note in terms of post burn concrete durability because cement and aggregate pastes contain components that can decompose after heating. This study aims to determine the compressive strength of concrete after fire and to determine the properties and characteristics of concrete after fire. This study used an experimental method using cube concrete specimens and concrete quality K 175. where each of the 5 samples was treated burned and not burned. Concrete is treated by curing for 28 days. The fuel test uses an electric furnace with the combustion temperature used is 1000 Celcius with a duration of 6 hours at the age of 35 days. Furthermore the test sample is cooled at room temperature for 24 hours. Changes that occur in post burn concrete include changes in the color of the concrete to gray white, crazing, spalling, release of aggregate grains, occur shrinkage and increased porosity. The results of post burn concrete press test also showed a decrease in compressive strength by 70%. The average percentage of post burn shrinkage is 13.79%. The average value of post burn porosity of concrete is 31.91%. So it can be concluded that concrete which experiences a fire at high temperatures will cause a very significant decrease in quality both in terms of strength and aesthetics.