Laserfiche WebLink
Entrez PubMed <br />;s <br />.�''`` <br />��.� <br />Page 2 of 2 <br />TWA of 3.3 xng/m.3 _ For concrete wall grinding during new building <br />construction the respirable quartz measurements ranged up to 0.66 �g/m3 <br />for a 191-minute sample, resulting in an eight-hourTWA of �.26 �g��� <br />The air sampling results for concrete sawing ranged up to 14.0 mg/rri3 for a <br />350-minute sample resulting in an eight-hour TWA of 10.0 mg/m3. During <br />the milling of asphalt from concrete highway pavement, the sampling <br />indicated a respirable quartz concentration rangingup to 0.34 mg/m3 for a <br />504-minute saniple, resulting in an eight-hour TWA of 0.3G rz�g/txz3. The <br />results of this work indicate the potential for respirable quartz <br />concentrations involving disturbance of concrete to range up to 280 times <br />the NIOSH Recommended Exposure Limit (REL} of 0.05 m.glz�n3 assuming <br />exposure for an eight- to ten-hour workday. Considering the aging of the <br />� concrete infrastructure in the United States, these results pose a challenge lo <br />all who have an interest in preventing silica exposures and the associated <br />disease silicosis. <br />'�IVTIl�: 11871757 [PubMed - indexed for MEDLINE] <br />�n r....��...u�..xv...... ��.aw.�r...�����4�r..... ..�����r�r..�.x.����... .....�..�••.........�.����.�r...�r�rV���......�r����n��.�r.��.�•�-4�.����ti-vr�n�err� <br />mmwauu�yy �av�v <br />........ . ...... �� <br />!'ki�Xr�a}� ' i:DC.L � �I,r,;L, 2� SoG'I kv� .�. 7Sala(1 kU <br />Write to the Hei� Desk <br />A#� � AJLAII ( M� { <br />f�epartment of Health & Fluman 5ervices <br />pnvacv Statement � Freedom of Information Act � Disdaimer <br />�:.. � �r. i� aa:ou <br />�:���wv�rv��. rrc:�+a.� I �.a3i � �,�nr,� �r�tr����r�r.��Fke�i�e��l�i��Erm�,�+a��A#wr�t 5�' �{?�l:t� <br />