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How Boston's Longfellow Bridge Was Reborn

The historic restoration of Boston's Longfellow Bridge is now complete! The large-scale granite restoration project included onsite blasting by United Stone, as well as dismantling the bridge’s iconic Rockport granite “salt and pepper” towers piece-by-piece, and then transporting them to nearby workyards in Charlestown via barge for offsite restoration. The now pristine towers were reassembled using a mix of modern and historic construction technology. Skilled masons at United Stone were able to clean ornate granite carvings as well as the large granite blocks using the same equipment and media.

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Silica Dust Suppression with Sponge-Jet

OSHA's Final Rule to protect workers from silica is now in effect. Companies that clean, restore, or prepare concrete and stone now have a greater job site responsibility related to respirable crystalline silica that becomes airborne during this process. In their Final Rule, OSHA has reduced the permissible exposure limit (PEL) for respirable crystalline silica to 50 micrograms per cubic meter of air, averaged over an 8-hour shift. To lower airborne silica created by construction processes, OSHA is requiring companies to add engineering controls to concrete, stone and other masonry cleaning and repair processes.

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Sponge-Jet Cleans the Old Face of Longfellow (Granite Restoration)

Time is of the essence for any public bridge project. Missing deadlines can be costly to bridge owners, operators and contractors, and ultimately to those who rely on them for daily transportation. For example, 118,600 cars and mass-transit passengers rely on timely passage from Cambridge to Boston, MA (USA) each week over the historic Longfellow Bridge. In the summer of 2013, the clock started on a $255 million project to replace structural elements and restore the bridge’s historical character.

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Dustless Granite Stone Restoration is possible with Sponge-Jet

Projects involving granite substrates are a contractor’s most common kind of masonry restoration. Granite is a beautiful, durable stone  used on the interior and exterior of buildings, structures, and monuments.It has a Mohs hardness ratings between six and seven and therefore capable of withstanding the demands of everyday life.

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