This project mostly consists of repairs to the existing masonry walls, using a combination of concrete, structural grouts and mortars, and replacement stone blocks from a local quarry. Scour and erosion to the toe of wall is recognised as a potential source of weakness in the future, so concrete protection is proposed in two areas: the toe beam and the bullnose.
During the tender phase of the contract, a specific concrete mix was specified – one which was reinforced with plastic fibres. Despite the added strength of this mix, there were concerns that some of the plastic fibres could potentially leak into the marine environment during construction, and that ultimately, all of the fibres would be released into the environment over the lifetime of the structure.
Over the course of several months, discussions took place between the contractor, the client, the designers and the supply chain, two acceptable alternatives were found: a fibre-free concrete mix for the toe beam, and a mix containing mild steel fibres for the bullnose.
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Monitor Report. Balfour Beatty Construction Services UK. North Yorkshire. April 2019
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