University Transportation Centers Program
Aggregates; Concrete aggregates; Concrete pavements; Freeze thaw durability; Pavement performance; Pores (Geology); Winter maintenance
Non-durable aggregate leads to premature pavement deterioration often known as D-cracking. Repair of such distress may be costly and the agencies often end up with early replacement of the pavement. Differentiating the durable and nondurable aggregate is crucial, however, challenging. Frost durability of coarse aggregate has been reported to be related to its pore structure and available test methods to identify pore structure are not cost-effective. Iowa pore index test has been used by Iowa Department of Transportation for three decades as a supplemental decision-making tool, however, the method has never been standardized due to the lack of data relating its results to aggregate freezing-thawing durability. The research will use the Iowa pore index test to characterize concrete coarse aggregate and analyze the relationship between the Iowa pore index test and aggregates freezing-thawing performance.