Anthropocene Magazine · Climate & nature

Study: Building Codes Hinder Low-Carbon Concrete Use

Current building codes, designed to prevent steel reinforcement corrosion in concrete, inadvertently discourage the use of low-carbon concrete alternatives. A new study suggests a climate-focused approach to updating these codes.

Low-carbon concrete mixes, which often incorporate supplementary materials like fly ash or slag, can absorb more CO2 but may become less alkaline, increasing rust risk for embedded steel. Existing codes, however, are written to prevent such corrosion, creating a barrier to adopting these greener materials.

Researchers at ETH Zurich modeled concrete corrosion, treating it as a dynamic process influenced by environmental factors rather than a fixed material property. They tested three concrete formulations across four cities with diverse climates, using local weather data to simulate moisture movement and its impact on corrosion.

The study found that climate, particularly moisture levels, is a more significant factor in concrete degradation than the specific mix. Wet conditions can accelerate corrosion up to 100 times faster than dry conditions, with variations between concrete types having a lesser effect.

This reframing suggests that the same low-carbon concrete might perform well in dry climates but degrade rapidly in humid ones. The findings imply that building standards should be adapted to local climate conditions instead of applying uniform rules globally.

The researchers propose that updating building codes to account for regional weather patterns could enable wider use of low-carbon concrete in suitable climates, without requiring new material science breakthroughs.

AI-samenvatting op basis van de bron.