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The search for sustainable alternatives to natural raw materials has become a priority for the construction sector. One of the main challenges concerns the replacement of natural sand, a non-renewable resource whose massive extraction has a significant environmental impact.

A new study published in the International Journal of Civil Engineering analyzes the use of Anhydrous Calcium Sulphate (ACS), a by-product of hydrofluoric acid production, as a substitute for fine aggregates in cementitious mortars.

The research findings highlight that replacing 30% of natural sand with ACS is not only feasible but actually improves mechanical performance in terms of compressive and flexural strength. Furthermore, the inclusion of this material extends the workability time of fresh mortar, facilitating construction site operations.

Although freeze-thaw durability tests suggest preferential use in dry environments, the application of ACS represents a concrete step toward a circular economy, reducing industrial waste and preserving natural resources.

https://link.springer.com/article/10.1007/s40999-025-01200-2