July 1, 2012
Public works department develops spec using recycled aggregate, which allows for construction waste — including toilets.
Recycling has reached a new level for the transportation construction industry. The Public Works Department of the city of Bellingham, Wash., pushed the limits of recycled materials use with a street project that included 400 old toilets incorporated into concrete. The Public Works Department developed a specification using recycled aggregate, which allows for the use of recycled brick, concrete, tile, toilets, and other similar types of construction waste.
“We did it because it was the right thing — and it was fun,” Anthony Freeman, P.E., project engineer for Bellingham, tells Aggregates Manager. “We got to play mad scientist. I think it [this project] really speaks about local partnerships, though.”
Freeman said the city was actively looking at using recycled concrete on the sidewalks. “Now, we have a spec that allows the city to do that,” Freeman says. “We are not only using toilets, but looking into capturing a bigger waste stream. There is not a huge market for recycled concrete, but we are going to enhance the market for it.”
The city’s recent work on a recycled concrete aggregate spec for flatwork (curb, gutter, sidewalk, and driveway) concrete served as the foundation for the creation of “Poticrete,” Freeman says. The new spec — and Poticrete — meet a goal to reduce the use of virgin materials and to improve the regional market for crushed concrete, he says.
When Freeman received a call in February 2011 from Sustainable Connections, a local non-profit with both waste-reduction and green-building initiatives, he was asked if the could find a place in a city project for 400 high-flow toilets from a federally funded housing retrofit project. The city worked with the retrofit contractor and Cowden Gravel and Ready Mix to collect and crush the porcelain, then mix the aggregate in a few different batches for testing, Freeman says.
Eventually Cowden determined the best mix included about 20 percent porcelain by volume, and the city set about incorporating 40 cubic yards of Poticrete into a street project, Freeman says. The final product met all requirements for sidewalks, driveways, and curb/gutter installations.
Although this type of project does decrease the need for virgin aggregate, it’s not going to economically hurt aggregates operations, Freeman says. “We’ll always need our local aggregate suppliers for high-strength virgin aggregate,” he says. “But for applications that don’t take extensive structural loads, why not use recycled concrete? It’s also a developing market that our aggregate and concrete suppliers can be part of.”
The Meador/Kansas/Ellis trail project, in Bellingham, Wash., includes an asphalt overlay, new sidewalks, new curb and gutter, landscaping, storm water management, and several regional sidewalk and trail connections. A key intersection of two trails and three sidewalks provided a showcase location. The city installed 2,100 square feet of Poticrete along with a decorative band and educational plaque that provides public information on the city’s efforts to work with local both to provide economic opportunity and to build more environmentally responsible public projects, Freeman says.
Currently, Whatcom County’s two regional solid waste management companies accept toilets for a small fee and provide them for future Poticrete installations. This use, along with other options for recycled aggregate, will help the city include more than 400 tons of recycled materials in concrete alone in street projects each year, Freeman points out.
“This is a situation where everyone wins,” he says. “This project and this use of toilets is an example of the strategic risks that public agencies need to take in this day and age to encourage local markets that support recycled materials and more sustainable road projects.”
This project received the first GreenRoads certification, according to Freeman.
Luck Stone sponsors rugged races, triathlon
As part of a three-year sponsorship that kicked off last year, Luck Stone served as the presenting sponsor of the 14th annual XTERRA East Championship off-road triathlon and trail running races held June 9-10. This was the 14th year for XTERRA in Richmond, Va.
Luck Stone says it shares a common goal with XTERRA “to empower others to achieve their personal best in an outdoor rugged terrain and to honor the environment.” The aggregates producer adds that it takes leadership, tenacity, and commitment to train for an XTERRA event.
“We are inspired by XTERRA’s athletes and outdoor enthusiasts,” Bob Grauer, president of Luck Stone, said in a press release. “Their grit and determination to be the best in the world and to exceed their goals is something we admire and strive to emulate daily in our business. We are thrilled to be partnering with XTERRA on the East Championship and to bring elite athletes to a city that encourages healthy outdoor activities and environmental stewardship.”
City of Richmond Mayor Dwight C. Jones says that the city of Richmond is playing an active role in getting the community active and engaged in fitness and health awareness with the Healthy Richmond Campaign.
“In partnership with the Friends of James River Park, Luck Stone’s sponsorship will also bring focus on environmental stewardship and showcase one of the best urban park systems in the nation,” Jones noted in a press release issued by Luck Stone.
Luck Stone continues to demonstrate its commitment to the Richmond Community and the environment by preserving open spaces, providing products for public trails and parks, and cleaning up trail way systems throughout the state of Virginia.
For more information on the partnership between Luck Stone and XTERRA, go to www.luckstone.com/xterra-world-tour-2012 or follow Luck Stone on Facebook at www.facebook.com/Luck.Stone.XTERRA. To follow Aggregates Manager on Facebook for more stories like this, go to www.facebook.com/AggregatesManager.