North / South America
Creating eco-friendly cement
Apr, 23 2012
(Pennsylvania) -- Researchers at Drexel University are trying to lower cement’s carbon footprint by using technology of the past to build sidewalks the future. It is the same technique that was used by the Greeks to build the Parthenon and the Egyptians for building the Great pyramids, so it make sense that it uses less energy.
To make today’s cement, you need a large mining operation, an intensive grinding operation and a huge kiln – fired up at 2700 degrees Farenheit. That’s a lot of energy and a lot of emissions.
Drexel’s method eliminates most of the mining and gets rid of the heat. They use limestone and leftover slag from steel mills to make a product with 10% of the emissions of normal cement.
And this could have a big impact: China alone is using more than 1.5 gigatons every year of cement– enough to make 2000 Pentagons.
By: Susanna, PF Web Maven
See video here:
US and European sales saw Hitachi Construction Machinery’s revenues for its 3rd quarter reach $4.92bn, a +3.9% increase on last year More
Dallas-based United States Lime & Minerals reported revenues up to $35.4 million for its fourth quarter and full-year 2014 results. More