Calcined clays - a key factor in decarbonizing the cement industry

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Our expertise ranges all the way from the clay deposit itself to the use of clays in concrete

The production of Portland cement is currently responsible for around 7 percent of global CO2 emissions caused by man. Reducing the clinker content in cement is a key lever for reducing these emissions. Due to the declining quantities of established cement substitutes and concrete additives, such as granulated blast furnace slag and fly ash, alternative reactive materials must be found.

Calcined clays as cement substitutes with a low CO2 content

The greatest potential in this context is attributed to thermally activated (calcined) clays. These are naturally occurring clays, but also secondary raw materials rich in clay, which are activated in a thermal process. This process only releases around a quarter of the greenhouse gases of conventional cement production, as it takes place at significantly lower temperatures and because the raw materials contain no or significantly less CO2.

Our experts offer a comprehensive range of R&D services in the field of calcined clays

At Fraunhofer IBP, we have the necessary know-how - from the clay deposit through calcination up to the use of calcined clay in cement and concrete. We will gladly assist you with the following research and development services:

  • Mineralogical and chemical analysis of clays
  • Dehydroxylation analysis
  • Derivation of optimal calcination parameters
  • Reactivity tests
  • Binder system adjustment
  • Examination of setting and hardening behavior in mortar and concrete
  • Assessment of effect on durability

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