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首页> 外文期刊>Journal of occupational and environmental hygiene >Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites
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Respirable crystalline silica exposures during asphalt pavement milling at eleven highway construction sites

机译：在11个高速公路施工现场的沥青路面铣削过程中可吸入的结晶二氧化硅暴露

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摘要

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 millingmachines 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 inWisconsin, andManufacturer 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 groundworker during the course of normal employeework 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 mu g/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 mu g/m(3) for the operator and 6.1 mu g/m(3) for the groundworker for the Manufacturer Amillingmachine. The geometric mean personal breathing zone air samplewas 4.2 mu g/m(3) for the operator and 9.0 mu g/m(3) for the groundworker for theManufacturer B millingmachine. In addition, upper 95% confidence limits for themean exposure for each occupation werewell below50 mu g/m(3) for both studies. The silica content in the bulk asphalt material beingmilled ranged from7-23% silica for roadsmilled by Manufacturer A and from 5-12% silica for roadsmilled 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.
机译：沥青路面铣刨机使用旋转的铣刨鼓来清除变质的路面，以便回收利用。清除路面可能会释放出可吸入的结晶性二氧化硅，工人可能会接触到该二氧化硅。本文介绍了两种不同的半车道和较大的沥青路面铣刨机对操作员和地面工人的可吸入结晶二氧化硅暴露的评估，这些铣刨机具有制造商设计和安装的通风粉尘控制装置和喷水装置。制造商A在威斯康星州的4个高速公路施工现场完成了11天的铣削，制造商B在印第安纳州的7个高速公路施工现场完成了10天的铣削。为了评估防尘效果，在11个不同地点的沥青路面铣刨的正常员工工作过程中，从操作员和地勤人员那里收集了全班个人呼吸区空气样品。在21天内收集了42个个人呼吸区空气样品（每天对操作员和地勤人员进行采样）。所有样品的可吸入晶体二氧化硅均低于50μg / m（3），这是美国国家职业安全与健康研究所建议的暴露极限。对于操作员而言，个人呼吸区几何平均空气样本对操作员而言为6.2μg / m（3），对于地勤人员而言为6.1μg / m（3）。对于操作员B铣刨机，操作员的个人平均几何呼吸区空气几何平均值为4.2μg / m（3），对于地勤人员为9.0μg / m（3）。此外，两项研究中，每个职业的氨氮暴露的95％置信上限均远低于50μg / m（3）。对于制造商A碾磨的散装沥青材料，二氧化硅的含量范围为7-23％，对于制造商B碾磨的散装沥青材料中的二氧化硅含量为5-12％。结果表明，由通风控制和喷水组成的工程控制为能够控制公路施工现场沥青路面铣刨机产生的可吸入晶体二氧化硅的职业暴露。

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