Evaluation of Exhaust Gas Emissions and Worker Esposure
from Asphalt Rubber Binders in Hot Mix Asphalt Mixtures

This page last reviewed October 8, 2008


“Control Mix 2 contained 100 % virgin aggregates and asphalt cement with a penetration of 200-250, equivalent to an AC-2.5. The rubber mix 1 (RBR1) also contained virgin aggregates and asphalt rubber binder manufactured using the “wet” process…”


Table 3 - Continuous Emissions Measurements and Method 18 Results (Units m/m3)
Evaluation of Exhaust Gas Emissions and Worker Exposure from Asphalt
Rubber Binders in Hot Mix Asphalt Mixtures. (Gunkel, 1994)


Operating Data / Conditions / Measurements Control 2 RBR 1
HMA Production Rate (tons per hour) 351 357
Dry Aggregate Rate (TPH) 330 333
Asphalt Cement Added (%) 5.75% 6.84%
Materials Moisture Content 4.17% 5.21%
Fuel Consumption (gal/hr) 655 690
Exhaust Gas Temperature (F) 311 324
Mix Temperature (F) 296 316
Sample Volume (SCF) 46.501 42.823
Sample Volume (cu. m) 1.317 1.213
Exhaust Gas Moisture (%) 27.0% 29.3%
Stack Temperature (F) 260 271
Actual Exhaust Gas Flow (ACFM) 89,540 95,450
Dry Exhaust Gas Flow (DSCFM) 47,076 47,836
Dry Exhaust Gas Flow (DSCMM) 1,333 1,355
CO2, %, Orsat Result 5.79% 6.02%
O2, %, Orsat Result 12.75% 12.10%
N2, %, Orsat Result 81.46% 81.88%
Carbon Dioxide (CO2) 6.00% 6.48%
Oxygen (O2) 12.87% 12.18%
Carbon Monoxide (CO) 430.5 259.5
Nitrogen Oxides (NOx) 139.3 124.4
Sulfur Dioxide (SO2) 74.4 76.7
Non-Methane Total Hydrocarbons (NMTHC) as Carbon 225.5 183.0
Methane (CH4) as Measured 27.7 10.6
Methane as Carbon 20.7 7.9
Total Hydrocarbons (THC) as Carbon 245.1 191.3
NMTHC as Carbon 225.5 183.0

Text above excerpted from Carlson, Douglas D. and Han Zhu. “ Asphalt-Rubber: An Anchor to Crumb Rubber Markets,” presented at the Third Joint UNCTAD / IRSG Workshop on Rubber and the Environment - International Rubber Forum, Veracruz, Mexico, October 7, 1999. (http://www.pcaz.com/rpa/pdf/anchor.pdf)

Douglas D. Carlson
Director of Government Relations
Rubber Pavements Association
1801 South Jentilly Lane, Suite A-2
Tempe, Arizona 85281-5738
  Han Zhu, Ph.D.
College of Civil and Environmental
   Engineering
Arizona State University
Tempe, Arizona 85287-5306
Website: www.rubberpavements.org   Email: han.zhu@asu.edu
Email: dougc@rubberpavements.org   Telephone: 1-480-965-2745
Telephone: 1-480-517-9944   Fax: 1-480-965-0557
Fax: 1-480-517-9959    

Original Source: Gunkel, Kathryn O’C P.E., “Evaluation of Exhaust Gas Emissions and Worker Exposure from Asphalt Rubber Binders in Hot Mix Asphalt,” Wildwood Environmental Engineering Consultants, Inc., Michigan Department of Transportation, March 1994.

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