Keeping concrete on the QT

This precast bio-concrete achieves 12 times the sound absorption in comparison to conventional concrete in ASTM testing.

Last week, US company, Prometheus Materials, announced remarkable results achieved in the ASTM C423 sound absorption testing of its “ground-breaking” bio-cement and bio concrete technology.

ASTM International certification programs include proctored, online written examinations and require the submission of evidence of satisfactorily completed performance evaluations.

“Inspired by biological processes found in nature, the company’s process uses microalgae to produce a bio-cement that offers an alternative to carbon-intensive Portland cement,” the company said in a statement.

“When mixed with aggregate, this bio-cement forms a zero-carbon bio-concrete with mechanical, physical and thermal properties that rival those of Portland cement-based concrete.”

The independent testing was conducted at the Johns Manville Technical Center in Colorado and found that Prometheus Materials’ bio-concrete demonstrated a Noise Reduction Coefficient (NRC) OF 0.60. The NRC rating indicates 60% sound absorption – 12 times that of traditional concrete.

Acoustic panels, segmented modular blocks and masonry units are part of the precast bio-concrete product line along with paving stones and grass pavers. Potential uses are residential. commercial, institutions, amphitheatres, music studios and highway barriers.

At present, these products are available only for select projects, with commercial availability slated for early 2024.