In-depth survey report: a laboratory evaluation of prototype engineering controls designed to reduce occupational exposures during asphalt paving operations at Champion Road Machinery, Shippensburg, Pennsylvania.
Mead KR; Mickelsen RL
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, ECTB 208-15a, 1999 Aug; :1-42
On November 6-9, 1995, researchers from the National Institute for Occupational Safety and Health (NIOSH) evaluated a prototype engineering control designed for the control of fugitive asphalt emissions during asphalt paving. The Champion engineering control evaluation was completed as part of a Department of Transportation (DOT) project to evaluate the effectiveness of engineering controls on asphalt paving equipment. The Champion phase one evaluation studied the performance of a single engineering control design. The prototype control was installed and evaluated on a Champion Model 1010W asphalt paving machine. The control design consisted of two perforated hoods, one mounted over each auger. A duct from each hood lead into the engine compartment where they converged into a single exhaust duct. The single duct passed up through the paver deck and attached to a hydraulic exhaust fan horizontally mounted on the paver deck. Test measurements indicated that the control system's exhaust volume was approximately 1000 cubic feet per minute (cfm) throughout the evaluation. During the indoor testing, the average capture efficiency measured near 90 percent. During the outdoor testing, which was hampered by strong wind gusts, the average capture efficiency consistently measured below 20 percent as the prototype design was evaluated at prescribed stationary orientations relevant to the prevailing wind. In addition to the capture efficiency reductions, the outdoor test results showed increased variation in capture efficiency as the wind gusts hampered the control's ability to consistently capture the surrogate contaminant.
Region-3; Exposure-monitoring; Engineering-control-technology; Equipment-Design; Highways; Asphalt; Fumes; Gas-detectors; Ventilation; Construction; Exhaust-systems
Field Studies; Control Technology
NTIS Accession No.
National Institute for Occupational Safety and Health