Alternative cement recipes—A recipe for eco-concrete

Read the full story from the Swiss Federal Laboratories for Materials Science and Technology.

It is the most widely used product in the world. Cement is indispensable yet its reputation has become quite tainted in the course of the ongoing climate debate. Mixed with water, sand and gravel, it results in concrete, on which our modern world is built. However, the frugal material is in the limelight primarily because of another property: The production of one ton of cement causes around 700 kg of carbon dioxide (CO2) that is emitted in the atmosphere. This is less than in the case of, say, steel or aluminum production. But it’s the sheer quantity that makes the difference. Every year, we produce around twelve cubic kilometers of concrete worldwide, a quantity that could completely fill Lake Lucerne—every year anew. And the trend is rising.

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