This study, published in the Journal of Cleaner Production, is the first to demonstrate that coffee waste can be used to improve the quality of concrete. It’s like giving coffee a “second chance.”
Science Behind It
Dr. Rajeev Roychand, the lead author from RMIT University, and his team came up with a method to enhance concrete’s strength by 30%. They achieved this by converting coffee grounds into something called biochar. They did this using a low-energy process at 350 degrees Celsius, without oxygen.
Process
The technique used, called pyrolysis, involves heating organic waste without oxygen. This process is environmentally friendly and helps reduce the burden on landfills.
Environmental Benefits
Disposing of organic waste, like coffee grounds, is a challenge because it releases greenhouse gases, such as methane and carbon dioxide, which contribute to climate change. By repurposing coffee waste for construction, we can reduce its negative environmental impact.
Reducing Sand Extraction
Professor Jie Li, another co-author, highlights that coffee biochar can replace some of the sand typically used in concrete. This is essential because the extraction of natural sand for construction has significant environmental consequences. Globally, 50 billion tonnes of natural sand are used annually in construction projects.
Circular Economy Approach
By adopting a circular economy approach, we can divert organic waste from landfills and preserve natural resources like sand. This approach benefits both the environment and the construction industry’s sustainability.
