Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

In-depth field evaluation... dust-control technology for asphalt pavement milling at South Dakota Highway 79 resurfacing project, Border States Paving and Industrial Builders, contractors, Buffalo Gap, South Dakota, August 15 through 17, 2006.

Authors
Blade-LM; Garcia-A; Shulman-SA; Colinet-J; Chekan-G
Source
NIOSH 2009 Sep; :1-28
NIOSHTIC No.
20036131
Abstract
As part of an ongoing study to evaluate the effectiveness of dust-control systems on pavement-milling machines, a field survey was performed during milling of asphalt on a rural four-lane divided highway. The objective of this survey was to estimate the reduction in respirable dust emissions and workers' exposures that could be achieved through the use of higher water flow rates through the milling machine's water spray system. The effectiveness of the dust controls examined in this study was evaluated by measuring the reduction in the respirable dust and respirable quartz exposures in personal and area samples collected during this typical milling job. Increasing the total water flow to the water-spray nozzles from about 12.5 gallons per minute (gpm) to about 18.8 gpm resulted in overall reductions in measured respirable dust concentrations at area air-monitoring locations around the machine. The average overall reduction based on the results of the time-integrated air sampling method used was 41 %, while that based on the mean results of the real-time data-logging instrumentation was 53%; both of these reductions were statistically significant at the 95% confidence level. In contrast, an examination of short-period subset data from the data-logging instruments (assembled from selected portions of the data sets generated closest together in time and space) revealed an average reduction of 14% that was not statistically significant. Overall, the results varied by location, with the greatest reductions occurring on the right side of the machine. Personal breathing-zone exposures to crystalline silica were below analytical limits of detection.
Keywords
Region-8; Control-technology; Engineering-controls; Respirable-dust; Dust-control; Construction; Road-construction; Road-surfacing; Machine-operation; Machine-operators; Silica-dusts; Concretes
Contact
National Institute for Occupational Safety and Health, Division of Applied Research and Technology, Engineering and Physical Hazards Branch, Mail Stop R-5 ,4676 Columbia Parkway, Cincinnati, OH 45226-1998
CAS No.
14808-60-7; 8052-42-4
Publication Date
20090901
Document Type
Field Studies; Control Technology
Fiscal Year
2009
NTIS Accession No.
PB2010-103867
NTIS Price
A04
Identifying No.
EPHB-282-14a
NIOSH Division
DART
Priority Area
Manufacturing
SIC Code
1611; NAICS-237310
Source Name
National Institute for Occupational Safety and Health
State
SD; OH
TOP