How does 'delayed ettringite formation' (DEF) affect the durability of concrete structures?
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Angel Patricio Garcia
“Delayed ettringite formation (DEF) negatively affects the durability of concrete structures by causing internal expansion and cracking. DEF occurs when ettringite, a calcium sulfoaluminate hydrate, forms after the concrete has already hardended, typically as a result of high curing temperatures or excessive sulfate content in the mix. As these ettringite crystals form, they expand within the hardened matrix, generating internal stresses that lead to cracking and gradual disintergration of the concrete. This cracking reduces the materials strength, stiffness, and resistance to freeze-thaw damage. Overall, DEF can significantly shorten the service life of concrete structures, with the risk being especially pronounced in massive elements where heat buildup during hydration is greater.”
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Kareem Hesham Mahmoud Awad
“None”
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