| Ettringite in building materials |
| Paper ID : 1060-ISCH |
| Authors |
|
Asmaa Abdel Fattah *, Rokaya Emad Department of Applied Chemistry, Science,Helwan University, Ain Helwan, Cairo, 11795, Egypt |
| Abstract |
| Ettringite, a mineral commonly found in natural settings like hydrothermal systems and sulfate-rich soils, can also form during the hydration process of Portland Cement. In laboratory conditions, ettringite can be synthesized as well. However, its presence in concrete can be detrimental to the material's durability. Ettringite can cause expansion-induced cracking in concrete, leading to structural damage. Additionally, it can contribute to sulfate attack, a process where sulfate ions penetrate the concrete and react with the cement paste, causing deterioration. This is particularly problematic in environments with high sulfate concentrations. Manganese, a component of iron ores and slags, can enter the clinker during the cement production process, especially when alternative fuels and raw materials are used. This can lead to the formation of Juravskite, a mineral closely related to ettringite. When limestone cement containing manganese is exposed to sulfate media, Juravskite can form, causing similar expansion and cracking issues as ettringite. |
| Keywords |
| Ettringite, Portland Cement, Concrete, Sulfate attack, Manganese, Juravskite, Limestone cement , Hydrothermal systems, Sulfate-rich soils, Expansion-induced cracking |
| Status: Abstract Accepted (Poster Presentation) |