Elevated temperature performance of cementitious mortars containing pumice, barite, and basalt powder

In this study, mortar samples were produced by substituting pumice, barite, and basalt powder instead of cement at 7.5% and 15% ratios. Produced 90-day samples were exposed to tempera-tures of 100, 200, 300, 400, 500, and 600 degrees C. After the effect of high temperature, two different cooling processes were applied: air and water. The unit weight, ultrasonic pulse velocity, and compressive strength of the produced samples were measured before the effect of high temper-ature. Compressive strength, ultrasonic pulse velocity, and mass loss values were also investigated after high temperature. In addition, TGA, XRD and SEM analyses of selected samples were made. The results showed that basalt-containing samples were less affected by the high-temperature effect among the additive-containing samples. In contrast, barite-containing samples were more affected than the other samples. However, it was observed that the compressive strength loss of the air-cooled samples was higher, while the mass loss was higher in the water-cooled samples. In addition, increases in compressive strength and ultrasonic sound transmission values were observed up to a certain temperature value.