Magnesium sulfate (MgSO 4), commonly known as Epsom salt, is a chemical compound that significantly impacts cement and concrete, especially under severe environmental conditions. It is often encountered in environments where concrete is exposed to saline soils, seawater, or industrial effluents containing sulfates. The interaction between magnesium sulfate and the components of concrete is critical in the context of the durability and lifespan of concrete structures. This compound, when introduced to concrete, can lead to chemical reactions that are detrimental under certain conditions, notably sulfate attack, which can cause severe degradation of concrete structures over time.