Slag Cement

Lafarge NewCem® is a supplementary cementitious material (SCM). It can be used in tested quantities to enhance the desired properties of concrete.


Slag is produced during the iron-manufacturing process. During the manufacturing process the materials are heated in a blast furnace to a molten state. The slag rises to the top and is separated from the iron for further processing. When slag is separated from iron and rapidly cooled with water (granulated), the morphology of the slag changes. This morphology change provides the slag with its cementitious properties. The granulated slag is then ground to a controlled fineness, typically greater than that of GU portland cement, and the finished product, called ground granulated blast furnace slag (GGBFS) is ready for shipment to our customers. 

The NewCem® Slag Cement Advantage

To produce quality slag, a producer needs to have slag with an ideal chemistry from a consistent source and needs to have equipment close to the slag source to provide rapid quenching of the slag. Lafarge engineers and scientists have led North America in the research and development of specifications for slag. Today, Lafarge’s knowledge and technical experience is unequaled by any other producer of GGBFS. Lafarge’s technical staff is available to ready-mixed concrete producers, engineers and specifiers for questions about the proper use of NewCem® in any application.

Lafarge NewCem® has:

  • High strength
  • Long-term durability
  • Decreased permeability
  • Increased resistance to alkali silica reaction and sulfate attack

NewCem® provides a significant contribution to sustainable construction due to the high replacement rates possible. Its use in concrete production consumes less energy and offers improved efficiency and building performance. NewCem® can contribute to the achievement of LEED (Leadership in Energy and Environmental Design) points.

Product claims are based on proper use in accordance with recognized industry standards. Please contact your Lafarge Cement representative for specific product information, availability, and ordering.

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