Massachusettes Bay Transit Authority: FSS 45DC

MARKET: Waterproofing : Below Grade
SYSTEM: FSS 45DC Elastomeric Spray Polyurea
PROJECT: Below Grade Waterproofing : Various Concrete Structures
OWNER: Massachusettes Bay Transit Authority, Boston, MA
CONTRACTOR: Jacor Inc. / P.J. Spillane Company

This major infrastructure project, set along the east and south corridors of Boston’s downtown, revamped the Interstate arterials in one of the most congested traffic areas in this country. Thought to be one of the largest and most costly public works project ever undertaken in the United States, this $10B plus Central Artery/Tunnel Project changed the landscape of Boston.

Bechtel/Parsons Brinckerhoff had to address serious ground water problems and subsurface soils contamination plaguing Reinforced Concrete Structures in this locale. Structures to be protected included cut and cover tunnels, bored tunnel linings, precast tunnel segments, utility structures, poured roofing, walls and slabs, transit stations for MBTA, and a host of ancillary and associated structures.

Methods of subsurface concrete protection used to date had proven inadequate to the challenge. The project team sought an alternative that could be placed against green concrete, was insensitive to moisture at the time of installation, protect the sub-grade structures from moisture intrusion while maintaining elastomer properties that would accommodate construction stresses and post construction movement and settlement.

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