Influence of rock salt impurities on limestone aggregate durability : technical summary.
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2016-08-01
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Edition:Technical summary
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Abstract:Non-durable coarse aggregate in concrete pavement can break down under
repeated freeze-thaw cycles. Application of rock salt may increase the severity of
exposure conditions because of trace compounds, such as calcium sulfate, in rock
salt. Concrete and saw-cut limestone specimens were also subjected to wet-dry
cycles in varying salt solutions to examine the influence of trace compounds in
rock salt. Subsequently, limestone aggregate in concrete was subjected to freezethaw
cycling in two methods: salt-treating the aggregate before batching concrete,
and half-immersing concrete specimens in rock salt solution during freeze-thaw
cycling.
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