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Concrete @ your Fingertips
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These appear as dark rings around tie-bolt holes. They are caused by localised loss of water at tie-bolt hole in formwork, causing localised changes in the water/cement ratio. Effective sealing of formwork around tie-bolts reduces the risk of their occurrence. |
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| Acknowledgement: Concrete Society | ||||||||
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| The information contained in this nugget has been provided by The Concrete Society technical staff. |
