Post Content

The first row of modular concrete stem pieces is laid out before the next layer is stacked on top to form the bridge abutments.

The first row of modular concrete stem pieces is laid out before the next layer is stacked on top to form the bridge abutments.

From smaller projects to the largest, MassDOT uses the latest, proven innovative techniques. For the first time in the state, MassDOT is using precast, modular concrete abutments on the Route 2/I-95 Bridge Replacement Project.

Accelerated Bridge Construction technologies, such as this one, reduce project duration significantly by shifting construction of some elements off-site. This also saves money and limits traffic impacts and road closures.

The precast abutments are used in the new Route 2 bridges over I-95 in Lexington. The abutments support the bridge spans at each end. A pier located in the I-95 median supports the middle of the bridge. The abutments are made of multiple layers of modular pieces in a “T” shape, with the “T’s” laid flat and stacked one on top of the other. The precast pieces were made by Oldcastle Precast of Rehoboth and shipped to the project site for assembly.

Another view of the “T” shaped concrete stems, showing the crushed stone backfill used for added support and stability.

Another view of the “T” shaped concrete stems, showing the crushed stone backfill used for added support and stability.

Each abutment has multiple stems, the long legs of the T’s which rest one on top of the other that carry the weight of the bridge (from vehicles, the bridge itself, snow/ice, etc.) down to the concrete footing. The space between the stems is filled with crushed stone to provide additional support and stability. By using the precast abutment pieces, MassDOT avoids the drilling and excavating used for the more traditional drilled shaft type of abutment foundation, saving the project time and reducing construction impacts. Additionally, the use of precast concrete and crushed stone backfill allowed for construction during winter months when pouring concrete would have been much more difficult.

Other innovative techniques employed on the project include intelligent compaction for the roadway base and pavement and “greening measures” to protect the surrounding environment. MassDOT’s use of innovative technologies cuts the budget without cutting corners.

Written By:

Tags:

Recent Posts

MassDOT Encourages Presidents’ Day Travelers to Plan Ahead posted on Feb 13

MassDOT Encourages Presidents' Day Travelers to Plan Ahead

MassDOT is advising members of the public traveling during the next several days to plan ahead, take advantage of MassDOT’s many travel “real time” tools and consider using public transportation this coming weekend if possible.  The public should note that Monday, February 17, is a holiday   …Continue Reading MassDOT Encourages Presidents’ Day Travelers to Plan Ahead

2020 International Aviation Art Contest Massachusetts State Winners Announced posted on Feb 11

2020 International Aviation Art Contest Massachusetts State Winners Announced

The MassDOT Aeronautics Division recently held judging at the State level for the 2020 International Aviation Art Contest “Flying Yesterday and Tomorrow.” The State winners in the three categories are listed below: Category I ages (6-9) First place – Wynter Larrabee, Nantucket Flying Association, Nantucket   …Continue Reading 2020 International Aviation Art Contest Massachusetts State Winners Announced

Baker-Polito Administration Announces Workforce Transportation Grant Awards posted on Feb 10

Baker-Polito Administration Announces Workforce Transportation Grant Awards

Today, at a meeting of the MassDOT Board of Directors and Fiscal and Management Control Board, Transportation Secretary and CEO Stephanie Pollack announced $4.2 million in funding for the Baker-Polito Administration’s Workforce Transportation Grant Program. The grants are a result of a recommendation in the   …Continue Reading Baker-Polito Administration Announces Workforce Transportation Grant Awards