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Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites.
J Occup Environ Hyg. 2016 07; 13(7):538-48.JO

Abstract

Asphalt pavement milling machines use a rotating cutter drum to remove the deteriorated road surface for recycling. The removal of the road surface has the potential to release respirable crystalline silica, to which workers can be exposed. This article describes an evaluation of respirable crystalline silica exposures to the operator and ground worker from two different half-lane and larger asphalt pavement milling machines that had ventilation dust controls and water-sprays designed and installed by the manufacturers. Manufacturer A completed milling for 11 days at 4 highway construction sites in Wisconsin, and Manufacturer B completed milling for 10 days at 7 highway construction sites in Indiana. To evaluate the dust controls, full-shift personal breathing zone air samples were collected from an operator and ground worker during the course of normal employee work activities of asphalt pavement milling at 11 different sites. Forty-two personal breathing zone air samples were collected over 21 days (sampling on an operator and ground worker each day). All samples were below 50 µg/m(3) for respirable crystalline silica, the National Institute for Occupational Safety and Health recommended exposure limit. The geometric mean personal breathing zone air sample was 6.2 µg/m(3) for the operator and 6.1 µg/m(3) for the ground worker for the Manufacturer A milling machine. The geometric mean personal breathing zone air sample was 4.2 µg/m(3) for the operator and 9.0 µg/m(3) for the ground worker for the Manufacturer B milling machine. In addition, upper 95% confidence limits for the mean exposure for each occupation were well below 50 µg/m(3) for both studies. The silica content in the bulk asphalt material being milled ranged from 7-23% silica for roads milled by Manufacturer A and from 5-12% silica for roads milled by Manufacturer B. The results indicate that engineering controls consisting of ventilation controls in combination with water-sprays are capable of controlling occupational exposures to respirable crystalline silica generated by asphalt pavement milling machines on highway construction sites.

Authors+Show Affiliations

a National Institute for Occupational Safety and Health, Division of Applied Research and Technology , Cincinnati , Ohio.a National Institute for Occupational Safety and Health, Division of Applied Research and Technology , Cincinnati , Ohio.a National Institute for Occupational Safety and Health, Division of Applied Research and Technology , Cincinnati , Ohio.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26913983

Citation

Hammond, Duane R., et al. "Respirable Crystalline Silica Exposures During Asphalt Pavement Milling at Eleven Highway Construction Sites." Journal of Occupational and Environmental Hygiene, vol. 13, no. 7, 2016, pp. 538-48.
Hammond DR, Shulman SA, Echt AS. Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites. J Occup Environ Hyg. 2016;13(7):538-48.
Hammond, D. R., Shulman, S. A., & Echt, A. S. (2016). Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites. Journal of Occupational and Environmental Hygiene, 13(7), 538-48. https://doi.org/10.1080/15459624.2016.1153803
Hammond DR, Shulman SA, Echt AS. Respirable Crystalline Silica Exposures During Asphalt Pavement Milling at Eleven Highway Construction Sites. J Occup Environ Hyg. 2016;13(7):538-48. PubMed PMID: 26913983.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites. AU - Hammond,Duane R, AU - Shulman,Stanley A, AU - Echt,Alan S, PY - 2016/2/26/entrez PY - 2016/2/26/pubmed PY - 2017/11/9/medline KW - Cold planers KW - dust control KW - engineering controls recycled asphalt pavement SP - 538 EP - 48 JF - Journal of occupational and environmental hygiene JO - J Occup Environ Hyg VL - 13 IS - 7 N2 - Asphalt pavement milling machines use a rotating cutter drum to remove the deteriorated road surface for recycling. The removal of the road surface has the potential to release respirable crystalline silica, to which workers can be exposed. This article describes an evaluation of respirable crystalline silica exposures to the operator and ground worker from two different half-lane and larger asphalt pavement milling machines that had ventilation dust controls and water-sprays designed and installed by the manufacturers. Manufacturer A completed milling for 11 days at 4 highway construction sites in Wisconsin, and Manufacturer B completed milling for 10 days at 7 highway construction sites in Indiana. To evaluate the dust controls, full-shift personal breathing zone air samples were collected from an operator and ground worker during the course of normal employee work activities of asphalt pavement milling at 11 different sites. Forty-two personal breathing zone air samples were collected over 21 days (sampling on an operator and ground worker each day). All samples were below 50 µg/m(3) for respirable crystalline silica, the National Institute for Occupational Safety and Health recommended exposure limit. The geometric mean personal breathing zone air sample was 6.2 µg/m(3) for the operator and 6.1 µg/m(3) for the ground worker for the Manufacturer A milling machine. The geometric mean personal breathing zone air sample was 4.2 µg/m(3) for the operator and 9.0 µg/m(3) for the ground worker for the Manufacturer B milling machine. In addition, upper 95% confidence limits for the mean exposure for each occupation were well below 50 µg/m(3) for both studies. The silica content in the bulk asphalt material being milled ranged from 7-23% silica for roads milled by Manufacturer A and from 5-12% silica for roads milled by Manufacturer B. The results indicate that engineering controls consisting of ventilation controls in combination with water-sprays are capable of controlling occupational exposures to respirable crystalline silica generated by asphalt pavement milling machines on highway construction sites. SN - 1545-9632 UR - https://www.unboundmedicine.com/medline/citation/26913983/Respirable_crystalline_silica_exposures_during_asphalt_pavement_milling_at_eleven_highway_construction_sites_ L2 - https://www.tandfonline.com/doi/full/10.1080/15459624.2016.1153803 DB - PRIME DP - Unbound Medicine ER -