The Materials Book

A Greener Cement: LC3 offers a lower-carbon alternative to the key ingredient in concrete Some 5 percent of man-made carbon dioxide entering the atmosphere comes from the kilns of cement plants. Until someone discovers an alternative, cleaning up the way cement is made will be key to sustainability. Limestone Calcined Clay Cement, or LC3, takes a big step in that direction. The relatively low-tech solution replaces much of the clinker used for traditional cement with heated clay. This reduces fuel consumption because the clay can be processed at around 800°C, about half the temperature needed to produce clinker. And less clinker means burning less limestone, so less carbon is released. The material is slowly becoming available as cement producers worldwide experiment with the idea. Example: LC3 Contributed by: Soumen Maity, India 313

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