This work studies the effect of short-term exposure to temperatures -15°C, 5°C, 40°C and 60°C on flexural performance Fibre Reinforced Concretes (FRCs) with steel synthetic fibres in cracked conditions. The results will be compared conditions at 20°C (submerged air environments). content was chosen guarantee similar residual strength all mixes. beams were pre-cracked following EN 14651 ambient ...