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In-depth study report: control technology for crystalline silica exposures in construction: exposures and preliminary control evaluation at a Restoration Preservation Masonry construction site, report no. CT-247-14.

Authors
Heitbrink-WA; Bennett-JS
Source
NIOSH 2000 Nov; :1-21
NIOSHTIC No.
20000931
Abstract
Respirable silica exposures were measured while workers were using grinders to remove old mortar during a building renovation. Respirable silica exposures ranged from 0.1 to 4.5 mg/cum for workers who were grinding mortar. A ventilated shroud was used in an ineffective attempt to capture the dust generated by the grinders. The pressure drop through the shroud, hoses, PVC pipe, and settling chamber were thought to be too large in relationship to the fan's capability to develop static pressure at the needed flow rate. Furthermore, the air was discharged back into the workplace without passing through an appropriate filter to remove the respirable dust. The lack of a filter could result in the dispersal of respirable dust throughout the workplace.
Keywords
Silica-dusts; Construction; Ventilation; Ventilation-equipment; Grinding-equipment; Region-1
CAS No.
14808-60-7
Publication Date
20001101
Document Type
Field Studies; Control Technology
Fiscal Year
2001
NTIS Accession No.
PB2001-101672
NTIS Price
A03
Identifying No.
CT-247-14
NIOSH Division
DART
Priority Area
Control-technology
Source Name
National Institute for Occupational Safety and Health
State
OH; MA
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