Concrete in a Minneapolis bridge replacing that which collapsed in 2007 is made of a concoction that boasts less environmental impact and durability. And it's self-cleaning.
"The project, built for more than $230 million and finished in September, three months ahead of schedule, 'might have been the most demanding concrete job in the United States in 2008,' said Richard D. Stehly, principal of American Engineering Testing, a Minneapolis firm that was involved in the project. It is a prime example of major changes in concrete production and use - changes that make use of basic research and are grounded, in part, in the need to reduce concrete's carbon footprint.
Concrete may seem an unlikely material for scientific advances. At its most basic, a block of concrete is something like a fruitcake, but even more leaden and often just as unloved. The fruit in the mix is coarse aggregate, usually crushed rock. Fine aggregate, usually sand, is a major component as well. Add water and something to help bind it all together - eggs in a fruitcake, Portland cement in concrete - mix well, pour into a form and let sit for decades."
FULL STORY: Concrete Is Remixed With Environment in Mind

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

Maui's Vacation Rental Debate Turns Ugly
Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

San Francisco Suspends Traffic Calming Amidst Record Deaths
Citing “a challenging fiscal landscape,” the city will cease the program on the heels of 42 traffic deaths, including 24 pedestrians.

Amtrak Rolls Out New Orleans to Alabama “Mardi Gras” Train
The new service will operate morning and evening departures between Mobile and New Orleans.

The Subversive Car-Free Guide to Trump's Great American Road Trip
Car-free ways to access Chicagoland’s best tourist attractions.

San Antonio and Austin are Fusing Into one Massive Megaregion
The region spanning the two central Texas cities is growing fast, posing challenges for local infrastructure and water supplies.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Heyer Gruel & Associates PA
JM Goldson LLC
Custer County Colorado
City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
Jefferson Parish Government
Camden Redevelopment Agency
City of Claremont