Implications of Pyrite Oxidation for Engineering Works by A. Brian Hawkins

By A. Brian Hawkins

The publication highlights and analyses the misery to constructions brought on by sulphate-induced heave, with specific connection with the hot difficulties within the Dublin zone of eire. It describes the formation of pyrite, the methods desirous about its oxidation and a few of the ways that consequential growth occurs. For the 1st time within the literature it discusses the best way that constructions should be raised above their aiding origin partitions by means of the growth of pyritiferous fill which has been used underneath ground-bearing ground slabs in eire. the importance of fractures during the iron sulphide microcrystals for the speed and volume of oxidation is mentioned. images and profiles of sulphate ingress into concrete/concrete blocks are provided. Case histories from the united kingdom, North the United States and eire are discussed.

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Barry, South Wales In contrast to Llandough Hospital which was built on in situ ground, the Town Hall in the nearby town of Barry was constructed on the site of an old quarry. Wilson (1987) recorded that some 20–50 mm of heave had occurred and showed a photograph of a splitting mudstone fragment. Although the load-bearing structure was extended to the original quarry floor, the ground-bearing floor slabs consisted of unreinforced concrete resting on up to 6 m of dark shaly mudstone fill—the material discarded when the Lower Lias limestones were quarried from the interbedded sequence.

The floors typically had spider cracking and in one house the floor arched by 75 mm within eight years, producing a pronounced crack with an associated ‘‘step’’ of over 40 mm. An example of a crack in the external brickwork is shown in Fig. 46. This widened upwards above the patio window which itself had separated from the adjacent wall. The houses were constructed on the Lias Clay which has a plasticity index of 30–40 % and is known to be a medium to highly shrinkable/swellable clay. As a consequence NHBC anticipated that the problems encountered were related to seasonal shrink/swell and engaged Tomlinson as an advisor to work with the author on the problems.

Outward deflection of the walls also occurred as the inner leaf had been constructed on the floor slab. The structure at Llandough Hospital was very similar to that at the Rideau Health Centre (Fig. 44), described previously by Quigley and Vogan (1970). In Engineering Implications of the Oxidation of Pyrite 43 Outward bulging of external walls Ground level Arching Cracks in internal walls Offsets in door frames Floor Heave ST Shale Bedrock Cracks x ST ST Floor x In ST Shale Bedrock Unaffected Basement Area Shale Bedrock 0 0 5m 5m Fig.

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