ABSTRACT

This study evaluates the effectiveness of dust treatments on gravel roads. Two dust suppressant types: CaCl₂ and MgCl₂ were used in this study on 26 gravel roadway segments. Two dust measuring devices: HAZ-DUST EPAM-5000 and Colorado State University (CSU) Dustometer were used to measure the fugitive dust emissions. The variables that might have an impact on the effectiveness of dust treatments were also collected. The data collection included traffic counts, 85th percentile speed, soil properties (moisture content, liquid limit, plastic limit and per cent passing through #200 sieve) and most importantly, dust emission. Statistical analyses indicated that dust emission was reduced by 87% after applying treatment compared to before treatment. HAZ-DUST EPAM-5000 (mean: 1.47 mg/m³, standard deviation: 0.93 mg/m³) was performed better than CSU Dustometer (mean: 1.48 mg/m³, standard deviation: 1.37 mg/m³). The dust reduction by applying two chemical treatments, CaCl₂ and MgCl_2, was very close to each other. Also, before applying treatment, traffic counts, % fines passing #200 sieve and annual rainfall were found to be significant. After applying treatment per cent, no variable was found to be significant.

摘要

本研究评估了砾石道路上灰尘处理的有效性。两种抑尘剂类型：CaCl ₂和 MgCl ₂在本研究中用于 26 个砾石路段。两个粉尘测量设备：HAZ-DUST EPAM-5000 和科罗拉多州立大学 (CSU) 粉尘计用于测量无组织粉尘排放。还收集了可能影响粉尘处理效果的变量。数据收集包括交通计数、85% 的速度、土壤特性（水分含量、液限、塑限和通过 #200 筛的百分比），最重要的是粉尘排放。统计分析表明，与处理前相比，处理后的粉尘排放量减少了 87%。HAZ-DUST EPAM-5000（平均：1.47 mg/m³，标准偏差：0.93 mg/m ³）优于CSU Dustometer（平均值：1.48 mg/m ³，标准偏差：1.37 mg/m ³）。_{通过应用两种化学处理，CaCl 2}和 MgCl ₂的降尘效果非常接近。此外，在应用处理之前，交通计数、通过#200 筛的罚款百分比和年降雨量被发现是显着的。在应用治疗百分比后，没有发现任何变量是显着的。