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Controlling dust from concrete saw cutting.

Authors
Shepherd-S; Woskie-S
Source
J Occup Environ Hyg 2013 Feb; 10(2):64-70
NIOSHTIC No.
20042808
Abstract
Cutting concrete with gas-powered saws is ubiquitous in the construction industry and a source of exposure to respirable crystalline silica. Volunteers from the New England Laborers Training Center were recruited to participate in a field experiment examining dust reductions through the use of water, from a hose and from a sprayer, as a dust control. In four series of tests, reinforced concrete pipe was cut under both "dry" and "wet" control conditions. Overall, the geometric mean respirable dust concentration for "dry" cutting (14.396 mg/m) exceeded both types of water-based controls by more than tenfold. Wet cutting reduced the respirable dust concentration by 85% compared with dry cutting when comparing tests paired by person and saw blade (n = 79 pairs). Using a respirable cyclone, a total of 178 samples were taken. Due to the high variability in dust exposure found in this and other studies of saw cutting, the data were examined for potential exposure determinants that contribute to that variability. Using mixed models, three fixed effects were statistically significant: control condition, worker experience, and location. A random effect for subject was included in the model to account for repeated measures. When each of the significant fixed effects was included with the random effect, it was apparent that inclusion of worker experience or location reduced the between-worker component of exposure variability, while inclusion of control condition (wet vs. dry) explained a large portion of the within-subject variability. Overall, the fixed effect variable for control condition explained the largest fraction of the total exposure variability.
Keywords
Silica-dusts; Respirable-dust; Quartz-dust; Dust-exposure; Dust-measurement; Construction-industry; Construction-materials; Control-technology; Dust-control; Dust-control-equipment; Concretes; Cutting-tools; Employee-exposure; Control-methods; Sampling; Analytical-models; Exposure-assessment; Exposure-levels; Dust-sampling; Author Keywords: construction; dust control; mixed model; silica
Contact
Susan Shepherd, Commonwealth of Massachusetts, Department of Labor Standards, 167 Lyman St., Westborough, MA 01581, USA
CODEN
JOEHA2
CAS No.
14808-60-7; 7631-86-9
Publication Date
20130201
Document Type
Journal Article
Email Address
Susan.Shepherd@state.ma.us
Funding Type
Cooperative Agreement; Construction
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U54-OH-008307; Cooperative-Agreement-Number-U60-OH-009762; B20130718
Issue of Publication
2
ISSN
1545-9624
Priority Area
Construction
Source Name
Journal of Occupational and Environmental Hygiene
State
MA; MD
Performing Organization
CPWR-The Center for Construction Research and Training, Silver Spring, Maryland
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