Reducing the Clinker Factor by partially substituting the clinker used in the composite cement production process with materials that have binding properties (also known as mineral components).
As far as sustainable development is concerned, this method is beneficial because it reduces:
- the amount of natural resources (fuel and raw materials) required per tonne of cement produced
- emissions of greenhouse gases (CO2) generated per tonne of cement produced
Among the mineral components suitable in this case are:
- natural materials (such as tuff, limestone etc)
- waste or secondary products from other industries (such as blast furnace slag, fly ash from coal-fired power plants etc.)
Holcim intends to expand its utilization of mineral components in cement production in order to develop a broad range of composite cements suitable for a diversity of purposes.
Using composite cement in concrete production results in multiple benefits, such as:
- improved properties of fresh concrete (workability, reduced segregation, etc)
- improved properties of hardened concrete (improved late compressive strength, lower heat of hydration and therefore lower crack tendency, increased durability)