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Entrez �'ubN�ed <br />Page I of 2 <br />.. � �*ec� a��r ��n^L l�r�� a��f,e��:� <br />_ .. � �� � � _' �.�. �.'h'�ai �rr�he� crE�ter]r� Mp hJ�BI <br />.r � ._. ... . .. .._. L���] R��a� <br />v►��ar. pu�rra�d{ �� � <br />Ail t7atabases Pe��d Nu�#eot'rde Protein Genome Structul'e pjVljM PMC Journals Bool <br />......... ....._.._.__...�,.�....... . .... ....—_. . ....._ �-. ,,,. , <br />�u�}ed ~ ...... - � �I r <br />Search _ f�r � .. �` <br />�: � � �.r -� <�� <br />Limits Previewllndex History Clipboard Details <br />T��sY1,Y1. ,4�r.� �,�a� �a - £�r€ � �E-r+d � <br />_ . . .. .. ....... ...... ......... .. ... ....... . . . . ....... <br />About Entrez �. <br />NC81 Toolbar � ' � <br />�#II; 1 ~ R��i�,;�: 0 � <br />Text Version <br />Entrez PubMed <br />Overview <br />Help � FAQ <br />Tutorials <br />NewlNotewo�thy <br />E-Utilities <br />PubMed Services <br />Journals Database <br />MeSF� Database <br />Single Citation Matcher <br />Batch Citation Matcher <br />Clinical Queries <br />Special Queries <br />Li nlcout <br />My NCBI <br />Related Resources <br />Order pocuments <br />NLM Mobile <br />NLM Catalog <br />NLM Gateway <br />TOXNET <br />Consumer Health <br />Clinical Alerts <br />ClinicalTrials.gov <br />PubMed Central <br />r i: l[����p F��rir��j, �� 2002 Mar;17�3�:209-21. Related Articles, Links <br />W, �. <br />... h 1 {'_C�i 1 <br />Respirable concrete dust--silicosis hazard in the construction <br />industry. <br />Linch Kll <br />Division of Respiratory Disease Studies, Surveillance Branch, National <br />Institute for Occupational Safety and Health, Morgantown, West Virginia, <br />USA. <br />Concrete is an extremely important part of the infrastructure of modem life <br />and must be replaced as it ages. Many of the methods of removing, <br />repairing, or altering existing concrete structures have the potential for <br />producing vast quantities of respirable dust. Since crystalline silica in the <br />form of quartz is a major component of concrete, airborne respirable quartz <br />dust may be produced during construction work involving the disturbance of <br />concrete, thereby producing a silicosis hazard for exposed workers. Silicosis <br />is a debilitating and sometimes fatal Iung disease resulting from breathing <br />microscopic particles of crystalline silica. Between 1992 and 1998, the <br />National Institute for Occupational Safety and Health (l�TIOSH) inade visits <br />to construction projects where concrete was being mechanically disturbed in <br />order to obtain data concerning respirable crystalline silica dust exposures. <br />The construction activities studied included: abrasive blasting, concrete <br />pavement sawing and drilling, and asphaliJconcrete milling. Air samples of <br />respirable dust were obtained using 10-mm nylon cyclone pre-separators, <br />37-mm polyvinyl chloride (PVC) filters, and constant-flowpumps <br />calibrated at 1.7 L/min. In addition, high-volume respirable dust samples <br />were obtained on 37-mm PVC filters using XI2" metal cyclones (Sensidyne <br />model 18) and constant-flowpumps calibrated at 9.0 I,/�a�in. Air sample <br />analysis included total weight gain by gravimetric analysis according to <br />NIOSH Analytical Method 600 and respirable crystalline silica (quartz and <br />cristohalite) using x-ray diffraction, as per NIOSH Analytical Method 7500. <br />For abrasive blasting of concrete structures,l;�e respirable crystalline silica <br />(quartz) concentrationranged up to 14.0 znglm3 for a 96-minute sample <br />resulting in an eight-hour time-weighted average (TWA) of 2.8 mg{m3. For <br />drilling concrete highway pavement the respirable quartz concentrations <br />ranged up to 4.4 mg/m3 for a 358-minute sample, resulting in an eight-hour <br />h�r�,:�`ru���„�. n cb�.nJ rn.ni h. �c�ti�:�ci7tre} ��� ile� �� 1 ti �i'�mt?� -k �1 ri c�r ��.�i�°= �lil, �7 � e���C �lop1 r�l� �a��... ��?] r'? fJf:��� <br />