Delayed Ettringite Formation (DEF) is a critical phenomenon in concrete that can significantly affect the durability and longevity of structures. DEF occurs when ettringite, a crystalline compound that initially forms during the hydration of cement, re-forms later in the concrete’s life under specific conditions. This delayed reaction is typically triggered by elevated temperatures and high sulfate concentrations, often exacerbated by inadequate curing practices or the use of high-aluminate cements. DEF can lead to severe expansion and cracking, compromising the structural integrity and serviceability of concrete elements.
This resource explores the mechanisms behind DEF, including the chemical and physical processes involved. It provides insights into the conditions that promote DEF and the factors that influence its development. The article also discusses preventative measures, such as proper mix design, controlled curing, and the use of alternative materials to mitigate DEF risks. Engineers and construction professionals will find valuable information on identifying, diagnosing, and addressing DEF issues, ensuring the long-term performance and safety of concrete structures. Understanding DEF is crucial for maintaining high standards in concrete construction and achieving durable, reliable infrastructure.
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