Study of expansion and subsequent damage due to ASR and DEF

Deterioration of mechanical properties of concrete has been associated to volumetric expansion due to Alkali silica reaction (ASR) and delayed ettringite formation (DEF). This paper investigates the expansion of ASR, DEF and their coupling on the dynamic Young’s modulus. The specimens simulated by adding SO₃, showed larger expansion and lower dynamic Young’s modulus compared to those without SO₃ at 20 °C and 90 °C, however, the effect was more significant and rapid when reactive aggregate was used. ASR may promote DEF to cause the damage when the adequate sulphate is supplied.