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November 8, 2002
Contact: Lorraine Marino 617-503-5536 EPS blocks in use at C09C2
It may seem strange for passing motorists to spot construction crews stacking huge white Styrofoam blocks near the I-90/I-93 Interchange, but this apparently peculiar scene is actually part of one of Modern Continental’s contracts with the Central Artery.
The Interchange, Ramps, and Surface Restoration at Albany Street job, contract C09C2, is using expanded polystyrene blocks – better known as EPS blocks – in place of conventional fill for several permanent and temporary ramps and roadways. This is a relatively new technique that’s been used in other parts of the country, but never in the Boston area.
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The EPS blocks eliminate the use of slab-on-pile construction and/or drilled shafts. They can be placed, removed, and reused if necessary, which provides a great advantage for any temporary structures within the contract. They’re all measured out and cut prior to assembly. "It’s kind of like putting a puzzle together,” said Rod Jackson, Computer Aided Design Engineer. “Each has its own specific location and elevation."
This lightweight fill technique, which was first developed in Norway, has been in use for about 25 years. Some EPS blocks that were buried for more than 20 years in that country were recently unearthed, and were still in such good condition that they were reused. The blocks have proven to be more tolerant of high and low temperatures, as well as moisture and other environmental factors.
The C09C2 contract, which began in February, was won on Modern’s bid of $180 million.
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