Road Weather Management Program
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Best Practices for Road Weather Management Version 2.0

Title:

Field Persistence of Anti-icing Sodium Chloride Residuals

Abstract:

The Ohio DOT generally applies 23 percent sodium chloride brine at the rate of 40 gallons per lane mile. An extensive study of brine residual decay over time and traffic was completed on portland cement concrete (PCC), Nova-Chip asphalt cement (NCAC), Micro-Seal asphalt cement (MSAC), and open-grade asphalt cement (OGAC) pavements. During five sampling events in October and November 2002, brine residual, pavement temperature, traffic counts, and atmospheric conditions were monitored for up to 3 days after initial anti-icing on U.S. Routes 33, 23, and 50 in Ohio. A Boschung Megatronic instrument model SOBO-20 that measured the surface pavement concentration of sodium chloride by conductivity was utilized in field and laboratory residual tests. The pavement surface affected initial brine concentration from site to site with NCAC, PCC, and MSAC readings being the lowest, midrange, and highest, respectively. Initial concentrations on OGAC were highly variable.

Source(s):

6th International Symposium on Snow Removal and Ice Control Technology, Transportation Research Circular, No. E-C063

Date: 2004

Author:

Hunt, Mitchell, Richardson

Keywords:


Winter maintenance
Pavement conditions
Adverse weather

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