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In this paper, we present the assessment of ultrasonic parameters of signals backscattered by mortar using the Principal Component Method. The measurement has been performed by the ultrasonic reflection technique using a transducer with a central frequency 0.5 MHz. The samples examined consist of specimen mortar mixtures prepared with ratio cement/sand (c/s = 0.5) and water/cement (w/c = 0.65) and studied at three temperatures 25 °C, 32 °C and 42 °C. The projection of the data showed that more than 93% of the information is retained and