The major hydraulic reactive components in Portland cement are alite and belite, which dominate the clinker before mixing with water. Upon hydration, the cement paste primarily consists of calcium-silicate-hydrate (C-S-H) and calcium hydroxide (Ca(OH)2). While C-S-H contributes significantly to the strength of cement, Ca(OH)2 can be considered undesirable in specific applications, such as in the storage of nuclear waste, where it raises pH levels and may facilitate radionuclide leaching. The discussion highlights the importance of understanding the context when evaluating byproducts in cement applications. Overall, the focus remains on the key reactive phases and their implications in various scenarios.
