What are the categories of cement based on application and performance?
Release Time:
2015-08-07
Source:
What are the categories of cement based on application and performance?
Cement is classified according to its application and performance as follows:
1. General-purpose cement, which is typically used in ordinary civil engineering and construction projects. General-purpose cement primarily refers to the six major categories of cement specified in GB 175—1999, GB 1344—1999, and GB 12958—1999: Portland cement, ordinary Portland cement, slag Portland cement, pozzolanic Portland cement, and fly-ash–based Ordinary Portland cement and composite Portland cement.
2. Special-purpose cement, cement designed for specific applications. Examples include G-grade oil-well cement and road silicate cement.
3. Special-purpose cements: cements that exhibit particularly outstanding performance in a specific property. Examples include rapid-hardening Portland cement, low-heat slag Portland cement, and expansive sulphoaluminate cement.
Cement is classified according to the name of its primary hydraulic binding material as follows:
1. Portland cement, commonly referred to as Portland cement abroad; aluminate cement;
2. Sulfoaluminate cement;
3. Ferroaluminate cement;
4. Fluoroaluminate cement;
5. Cement whose main constituents are volcanic ash, pozzolanic materials, and other active materials.
Cement is classified, according to the principal technical properties specified in its designation, as follows:
1. Rapid hardening: classified into two types—rapid hardening and ultra-rapid hardening;
2. Heat of hydration: classified into moderate-heat and low-heat types;
3. Sulfate resistance: classified into moderate sulfate resistance and high sulfate resistance;
4. Expansiveness: classified into two types—expansion and self-stress.
4. High-temperature resistance: The high-temperature resistance of aluminous cement is classified according to the alumina content in the cement.
Cement names are assigned according to different categories, based on the cement’s primary hydraulic mineral composition, supplementary materials, intended applications, and principal characteristics, with an emphasis on brevity and accuracy; when the full name becomes excessively long, abbreviations are permitted. General-purpose cements are named by prefixing the designation of the cement’s primary hydraulic mineral with the name of the supplementary material or another appropriate term. Special-purpose Cement is named according to its specific application and may be designated with different grades. Special-purpose cement is named after the principal hydraulically active mineral in the cement, combined with its primary characteristic, and may also be designated with different grades or with the name of the blended material. Cement whose main constituents are pozzolanic or latent-hydraulic materials, as well as other active materials, is named after the principal The names of the constituents are prefixed with the name of the active material, and may further be supplemented with a descriptive term, such as gypsum–slag cement or lime–pozzolan cement.
