Trenchless Technology - April 2010
$60 million project under way using advanced mortar for rehab work. Chicago began the project four years ago and is now rehabilitating thousands of manholes annually. With a population of approximately 2.8 million, Chicago is the third largest city in the United States. The city's massive storm and sewer system includes more than a quarter million manholes and catch basins. Tens of thousands of the manholes are nearly 100 years old, and the bricks or blocks they are made of are held together with small amounts of mortar -- most need repair and many are close to failing.