North-east England was the cradle of the Industrial Revolution in Europe, with coal deposits providing the main energy source for a thriving industrial base. Much of the heavy industry spawned by coal has left a legacy of polluted land, and because the development was concentrated around the Rivers Tyne, Wear and Tees, a large number of the derelict s ites are close to the banks of these reivers. Slurry trench cut-off walls along the river banks provide one solution to prventing pollution of the rivers. The slurry walls consist principally of hydrated bentonite and cementitious materials, usually a mix of cement and ground granulated balst furnace slag (ggb) or pulverised fuel ash (pfa). This paper describes the installation of one such wall along the banks of the River Tees to prevent pollution from a former gas works site and provide permeability test results frm the slurry during the frist 8 weeks since construction.
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