What is Sulfate Resisting Cement (SRC)?

In this video, we explore the topic of sulfate-resisting cement (SRC) and its importance in concrete structures exposed to sulfate-rich environments. SRC, also known as sulfate-resistant cement, is a specialized type of Portland cement designed to enhance resistance to sulfate attack.
We delve into the composition of SRC and Ordinary Portland Cement (OPC) according to ASTM standards, highlighting the crucial role of tricalcium aluminate (C3A) content in determining sulfate resistance. Lowering the C3A content minimizes the risk of sulfate-related deterioration, as C3A is highly reactive with sulfates.
The video presents recommendations for selecting the appropriate cement type and water-cement ratio for normal-weight concrete subjected to sulfate attack, based on the severity of sulfate exposure. It also explores the benefits of incorporating pozzolans such as fly ash, blast furnace slag, silica fume, or metakaolin in reducing the potential for sulfate attack.
We discuss the two main forms of sulfate attack on concrete, which involve reactions resulting in the formation of expansive compounds like gypsum and ettringite, or the damaging mineral called thaumasite. These reactions can lead to the expansion, cracking, and deterioration of concrete structures, particularly in sulfate-rich environments.
To combat these issues, sulfate-resisting cement has been developed by restricting the amount of tricalcium aluminate (C3A) in the cement composition, as C3A is responsible for the formation of ettringite in the presence of sulfates.
Join us in this informative video to learn more about sulfate-resisting cement and how it plays a crucial role in protecting concrete structures from sulfate attack.
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