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This paper presents the experimental results regarding the evolution into time of the road concrete quality with blast furnace slag BS, obtained by the UPV test for measuring the propagation velocity of the ultrasonic pulses compared with the compressive strengths of mechanical tests The UPV and the compressive strengths of the concrete containing blast furnace slag were determined at the age of 28, 100 and 150 days on 150 mm cubes on road concrete made with conventional materials and on road concrete with blast f...