Building Green: Development and Evaluation of an Environmentally Friendly Concrete

Montana State University, Bozeman MT

Investigators

Abstract

The primary goal of this project is to develop an environmentally friendly (i.e., green) concrete to reduce the significant environmental impacts associated with the use of traditional concrete. Typical concrete consists of sand/gravel bound together by Portland cement. In the concretes studied in this project, the sand/gravel will be replaced with recycled glass, and all of the Portland cement will be replaced with fly ash, which is a fine ash produced when coal is burned to generate electricity. This project will identify fly ashes from sources around the country that can be used in this new concrete. Concrete elements made with these ashes and recycled glass will then be tested to determine their engineering properties and durability. The project will conclude with a large-scale demonstration project. The benefits to society as a result of this research are at least twofold. The environmental impacts of using traditional concrete as a construction material are significant. Production of Portland cement is an energy intensive process, and is reportedly responsible for up to 7% of greenhouse gas emissions worldwide. Additionally, both the production of Portland cement and sand/gravel disturb virgin land. Conversely, the fly ash and recycled glass to be used in the proposed concrete represent two common waste streams. Thus, this new concrete minimizes energy use and environmental disturbance, while reusing waste materials. Additionally, the project will encourage interest and diversity in science and engineering by supporting students throughout its duration, including a Native American internship.