What are the types of cement used in concrete?

The types of cement used in concrete are diverse, with Ordinary Portland Cement (OPC) and portland-pozzolana cement being two common types. Ordinary Portland Cement is the most widely used cement due to its versatility and effectiveness in producing strong concrete. It serves as the primary binder in concrete mixtures.

Portland-pozzolana cement incorporates pozzolanic materials, such as fly ash or silica fume, which enhance the properties of concrete, including durability and reduced permeability. This combination can improve performance in specific environments, particularly where sulfate resistance or lower heat of hydration is required.

While sulfate-resistant cement is an important type, particularly in areas with high sulfate soils or exposure to sulfates, it does not cover the range of cements used in various applications. Similarly, claiming that only Ordinary Portland Cement is used ignores other important types that have differing applications based on performance requirements. Additionally, mentioning rapid-hardening cement and aggregate cement does not reflect standard nomenclature related specifically to cement types, as aggregate is not classified as a type of cement.

Thus, the correct identification of both Ordinary Portland Cement and portland-pozzolana cement illustrates a comprehensive understanding of the types of cement available for concrete production.