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• W4387591112 abstract "Since 2019, geologists at Petrolab have tested concrete block samples from over 1800 properties in County Donegal and observed deterioration patterns based on the aggregate types used within those concrete blocks. Across these properties more than 25 aggregate types have been used within concrete block, with seven distinct types considered high risk when assessed against relevant standards. With respect to those considered high risk, elevated free mica and elevated reactive sulphides (predominantly pyrrhotite) contents appear to play a critical role, particularly in phyllite aggregates commonly found in defective blockwork. The particular concentration of both of these mineral groups is considered the main cause of the rapid degradation often observed with this aggregate type. Other high-risk aggregates have lower amounts of one or both of these mineral groups, but they are still present in concentrations that are cause for concern and associated in some instances with damaged property. These findings have important implications. Firstly, with two mineral groups to define risk, the extent of risk can be split depending on the concentrations of the different minerals with potentially different remedial pathways followed in each instance. Aggregates with high concentrations of both free mica and sulphides (predominantly pyrrhotite) will pose the highest risk, likely requiring the most significant intervention in the long-term, while aggregates with only free mica and low sulphide content will be lower risk. In support of this, none of the properties tested to date, where only free mica risk is present within the concrete samples, have gone on to display the most serious degradation category. This, coupled with the evidence of internal sulphate attack present within the most high-risk pyrrhotite-bearing aggregate, is further evidence of the importance of internal sulphate attack in the highest risk aggregates. For all seven aggregates of concern the authors provide general recommendations for remedial measures, or further research based on the findings of this study. Secondly, the risk window for affected properties appears wider than initially believed. It spans for at least two decades with a significant window encompassing structures built between 1995 and 2010. The currently recorded latest occurrence is 2015, but it is not clear from the current data that this latest occurrence reflects the last use of defective concrete block due to the inherent latency period between building construction and the time for degradation to set-in. Consequently, a long-term testing regime is necessary to provide confidence in property conveyancing within County Donegal for properties built within, and since, the defined risk window." @default.
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• W4387591112 date "2023-12-01" @default.
• W4387591112 modified "2023-10-14" @default.
• W4387591112 title "High risk concrete blocks from County Donegal: The geology of defective aggregate and the wider implications" @default.
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• W4387591112 doi "https://doi.org/10.1016/j.conbuildmat.2023.133404" @default.
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