HPC™ is designed to meet the strictest performance criteria.

The primary ingredients in HPC™ are Portland Cement clinker, fly ash and gypsum ground to a fine powder. Pozzolans typically include either a Class C or Class F fly ash at varying percentages by weight, depending on the specific performance criteria being addressed.

Fly ash is primarily silicate glass containing silica, alumina, lime and iron. Certain fly ashes exhibit both pozzolanic and cementitious properties.

A by-product of cement hydration is calcium hydroxide, which is water soluble. A big advantage to using fly ash in a blended cement is that a pozzolan will react with the calcium hydroxide to form other cementitious compounds, creating a more dense, durable concrete.

HPC™ is manufactured to meet the requirements of ASTM C 595, Standard Specifications for Blended Hydraulic Cements, and ASTM C 1157, Standard Performance Specifications for Blended Hydraulic Cements. HPC may be designed as moderate or high sulfate resistant, moderate or low heat of hydration or option R, low reactivity with alkali-reactive aggregates.

HPC™ is manufactured under controlled conditions to ensure consistent quality and uniformity. Holcim's tightly-controlled environment assures optimal proportions, chemistry and particle size distribution for the best possible performance.

For more information on this product, or technical service assistance provided at no charge to Holcim customers, contact the Holcim market manager or technical service manager in your area.