Influence of Rock Salt Impurities on Limestone Aggregate Durability

Project Details
STATE

KS

SOURCE

TRID

START DATE

01/01/12

END DATE

08/01/16

RESEARCHERS

Kyle A. Riding, Jonathan Varner, Cale Armstrong

SPONSORS

Kansas DOT

KEYWORDS

Aggregate Durability, Freeze-Thaw Cycles, Limestone Aggregate, Rock Salt

Project description

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 freeze-thaw 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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