Green concrete

A more durable and stronger concrete that is also more environmentally
benign has been developed by scientists at the University of Exeter, UK.
The key ingredient of their new formulation for this ubiquitous
construction material is the now well-known carbon allotrope, graphene.
The new composite material, which is more than twice as strong and four
times more water resistant than existing concretes, can be used directly
by the construction industry on building sites, the team suggests.
Ironically, the use of graphene actually reduces the carbon footprint of
making the concrete.