A cheap cement additive cuts emissions by 12 percent, lab tests suggest

A mix using crushed seashell powder lowered carbon dioxide per tonne of cement in a pilot batch.

Published 27 October 2026 at 4:21 am IST · 1 min read

Engineers tested a cement blend in which 8 percent of the limestone was replaced with processed shell powder.

Compressive strength after 28 days was 98 percent of the standard mix. Emissions per tonne fell by 12 percent in a lifecycle estimate.

The team warns that shell supply is limited and the result comes from a single plant.

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