Shulou(Shulou.com)11/24 Report--

CTOnews.com, August 24 (Xinhua) Human beings produce about 4.4 billion tons of concrete each year, which consumes about 8 billion tons of sand, and the massive exploitation of sand has led to a serious shortage in recent years. At the same time, we also produce about 10 billion kilograms of coffee grounds every year, most of which are buried in landfills and emit large amounts of greenhouse gases. The team at the Royal Melbourne University of Technology (RMIT) found that coffee grounds can be specially treated to replace sand in the concrete production process, producing stronger chemical bonds than individual sand in the right proportion.

Tuyuan PixabayCTOnews.com noted that the lead author of the study, Dr Rajeev Roychand of the School of Engineering at the Royal Melbourne University of Technology, said in a recent report: "the disposal of organic waste poses a challenge to the environment because it emits large amounts of greenhouse gases, including methane and carbon dioxide, leading to climate change." He pointed out that Australia alone produces 75 million kilograms of used coffee grounds every year, most of which end up in landfills.

Dr. Roychand explained that coffee grounds cannot simply be mixed with standard concrete because they contain organic matter and do not combine with other materials. To make coffee grounds more compatible, the team tried to pyrolyze the materials at 350 and 500 degrees Celsius and then replace the sand in the concrete at 5%, 10%, 15% and 20%.

The team found that 350 degrees was the ideal temperature, and coffee grounds treated at 350 degrees could form stronger chemical bonds with other components of the concrete, increasing the compressive strength of the concrete by 29.3%.

The team believes that the findings will not only reduce sand mining and coffee grounds landfills, but also reduce greenhouse gas emissions and improve the quality of concrete.

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