Graphene oxide boosts concrete strength with ultra‑low loadings

GO is known to enhance the mechanical properties of cement‑based materials, but previous results have often been inconsistent because GO tends to aggregate in the highly alkaline, ion‑rich pore solution of cement. Aggregation drastically reduces GO’s exposed surface area and limits its interaction with the cement matrix. By systematically linking GO’s dispersion state in solution to rheology and compressive strength, the researchers show that strength enhancement is governed by accessible surface area, not just dosage.

Researchers from UCLA, Arizona State University and Technical University of Munich (TUM) recently showed how carefully controlling the dispersion of graphene oxide (GO) in cementitious mixtures can deliver stronger, more durable, and potentially lower‑carbon concrete. Their work demonstrates that performance depends more on how uniformly GO sheets are distributed than on how much GO is added.GO is known to enhance the mechanical properties of cement‑based materials, but previous results have often been inconsistent because GO tends to aggregate in the highly alkaline, ion‑rich pore solution of cement. Aggregation drastically reduces GO’s exposed surface area and limits its interaction with the cement matrix. By systematically linking GO’s dispersion state in solution to rheology and compressive strength, the researchers show that strength enhancement is governed by accessible surface area, not just dosage.

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