? One mile of State Route 21 in Effington County was also repaved with RSHMA
in 1994. This was a simple resurfacing project using the same shingle
material and mix parameters as the Chatham Parkway project.
As with the earlier project, mix sampling at the time indicated that the RS-HMA
material properties were comparable to the conventional HMA mix. Six cores
were taken from the road after approximately two years of service. Those
results, and field observations indicate that the RS-HMA is performing well.
? Economic estimates concluded that the incorporation of 5% scrap shingles
would reduce the cost of HMA by approximately $1.70 per ton. Disposal cost
for the shingles in Georgia was $16.50 per ton; processing costs were about
$5.00 per ton, resulting in a significant economic incentive.