Asphalt Rubber Technology Information Center
Industrial Hygiene Evaluation of Asphalt/Rubber Field Paving Operations

September, 1993
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KTA Environmental conducted an industrial hygiene evaluation of highway paving operations.  The purpose of this
evaluation was to compare worker exposures to asphalt emissions during the production and application of hot mix
asphalt materials with and without crumb rubber addition.  Three types of asphalt mixes were involved in the testing,
dense grade with rubber, gap grade with rubber, and gap grade without rubber.  Industrial hygiene air samples were
collected from worker breathing zones and work areas.  Samples were collected simultaneously at the HMA processing
facility and at the paving sites to measure the concentration of specific chemicals, thought to be present in asphalt
emissions.  Three days of testing were performed, to evaluate worker exposures to the following parameters: total
particulate, benzene soluble fraction of asphalt emissions, sulfur heterocyclics, polycylic aromatic hydrocarbons, BTEXS
VOCS, and Nitrosamines. NOTE: Pages 4, 6 and 8 may be missing or the report skip the pages.
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