Other unusual metals are also in play in the stadium’s design. The Olympic Stadium ring beam that supports the fabric roof was changed so that reclaimed gas pipes could be used.
Part of the 2012 Games’ main objectives include sustainability, with a goal of 20 percent of construction materials (by value) and 25 percent of aggregate (by weight) to come from recycled or secondary sources. And as of November 2009, 97 percent of the construction waste generated in completing the various projects for the London Games has been recycled. In addition, concrete and brick, that currently represent approximately 20 percent of waste, are crushed on site for reuse.
These waste-reduction measures have resulted in an estimated 1,599 fewer vehicle movements from July to September 2009, compared to the previous three months.
According to Populous, designers of the stadium, “Each component takes a sustainable approach that uses only what is needed for the event and then transforms to a long-term future use; the whole process uses a minimum of services.”
In fact, the stadium’s design takes into account its short lifespan. Part of the structure includes a permanent 25,000-seat stadium. However, it also includes a 55,000-seat skyward extension that can be removed when no longer needed.
Deconstruction is also an important component, as designers are bolting, rather than welding, steel to make the stadium easier to tear apart.
And as far as the London police are concerned, this is just one initiative they are using to “green” up their crime-fighting operations. They have collected 3.3 million spent bullets, recycling them into photo frames and jewelry. They also recycle other miscellany, including old uniforms, body armor, cooking oil and horse manure.