Performance of Self-Compacting Concrete Using Dolomite Powder at Elevated Temperatures and Strength Prediction Analysis

Self Compacting Concrete (SCC) is an innovative concrete type used in industrial and high-rise constructions. Unintentionally or operationally, concrete structures can experience high temperatures. There is a need to develop an SCC mix that can perform better than the conventional SCC mixes at elevated temperature. In this study, six proportions of Dolomite Powder Self Compacting Concrete (DPSCC) mixes having industrial waste fly ash and powdered mineral dolomite were examined to reduce cement use. Mechanical characteristics of DPSCC at four different elevated temperatures 200℃, 400℃, 600℃, and 800℃ were studied. The analysis includes weight loss, residual compressive strength, flexure strength and nondestructive ultrasonic pulse velocity. A reduction in residual strength is observed with increase in temperature in both traditional SCC and DPSCC. Conventional SCC loses its strength more than that of DPSCC at high temperatures. Dolomite powder provides a good contribution to enhance the performance of DPSCC during fire incidents. Mathematical equations are developed to make predictions about the strength of DPSCC subjected to elevated temperature. Three approaches have been used to predict the strength of DPSCC at elevated temperatures. The predicted strength values of DPSCC subjected to elevated temperature are very close to the experimental results.