Alternate Methods To Determine Asphalt Content

1998 ◽  
Vol 1616 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Brian D. Prowell
Keyword(s):  
Solvent Extraction ◽  
Clean Air Act ◽  
Test Method ◽  
Field Variation ◽  
Promising Alternative ◽  
Ignition Furnace ◽  
Chlorinated Solvent ◽  
Clean Air ◽  
Alternative Testing ◽  
Asphalt Content

A method was identified to determine asphalt content to replace chlorinated solvent extraction. Production of trichloroethane was banned on December 31, 1995, as part of the 1990 Clean Air Act Amendments. Initially, the study focused on evaluating the nuclear asphalt content gauge with Marshall plugs. During the course of the research, early data from the National Center for Asphalt Technology (NCAT) indicated that the ignition method was a promising alternative. Testing was conducted with three generations of ignition furnaces. Four aggregate types were evaluated with typical surface mix and base mix gradations found in Virginia. Samples for evaluation were produced at four asphalt contents for each mix design representing typical field variation around the optimum. Operator variance samples were tested nondestructively in the nuclear gauge and then destructively by solvent extraction and the ignition method. As a result of the research, a test method was developed using the ignition furnace with an internal weighing system. This method has been specified as a replacement for solvent extraction in Virginia.

Current Status of R&D Activities on Low Emission Gland Packings in Japan

2005 ◽  
Author(s):  
Takashi Kobayashi
Keyword(s):  
Clean Air Act ◽  
Test Method ◽  
Current Status ◽  
Piping System ◽  
Low Emission ◽  
Clean Air ◽  
Clean Air Act Amendment

Attention has been paid on emission from valves in piping system to meet the regulations such as TA-LUFT in Europe and Clean Air Act Amendment of 1990 in USA. In this presentation, discussions are made on R&D activities in Japanese industries regarding low emission gland packings. New structure and material used in those applications are shown. A test method for gland packings in Japan is also shown.

Comparing the Clean Air Act and a Carbon Price

2013 ◽  
Author(s):  
Nathan D. Richardson ◽  
Arthur G. Fraas
Keyword(s):  
Clean Air Act ◽  
Carbon Price ◽  
Clean Air

scholarly journals Trends in precipitation chemistry across the U.S. 1985–2017: Quantifying the benefits from 30 years of Clean Air Act amendment regulation

2021 ◽  
Vol 247 ◽  
pp. 118219
Author(s):  
Michael R. McHale ◽  
Amy S. Ludtke ◽  
Gregory A. Wetherbee ◽  
Douglas A. Burns ◽  
Mark A. Nilles ◽  
...  
Keyword(s):  
Clean Air Act ◽  
Precipitation Chemistry ◽  
Clean Air ◽  
Clean Air Act Amendment ◽  
The U.S

scholarly journals Effectiveness of SOx, NOx, and Primary Particulate Matter Control Strategies in the Improvement of Ambient PM Concentration in Taiwan

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 460
Author(s):  
Jiun-Horng Tsai ◽  
Ming-Ye Lee ◽  
Hung-Lung Chiang
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Model Simulation ◽  
Control Strategies ◽  
Ambient Air ◽  
Clean Air Act ◽  
Control Measures ◽  
Control Plan ◽  
Clean Air ◽  
Pm2.5 Concentration

The Community Multiscale Air Quality (CMAQ) measurement was employed for evaluating the effectiveness of fine particulate matter control strategies in Taiwan. There are three scenarios as follows: (I) the 2014 baseline year emission, (II) 2020 emissions reduced via the Clean Air Act (CAA), and (III) other emissions reduced stringently via the Clean Air Act. Based on the Taiwan Emission Data System (TEDs) 8.1, established in 2014, the emission of particulate matter 2.5 (PM2.5) was 73.5 thousand tons y−1, that of SOx was 121.3 thousand tons y−1, and that of NOx was 404.4 thousand tons y−1 in Taiwan. The CMAQ model simulation indicated that the PM2.5 concentration was 21.9 μg m−3. This could be underestimated by 24% in comparison with data from the ambient air quality monitoring stations of the Taiwan Environmental Protection Administration (TEPA). The results of the simulation of the PM2.5 concentration showed high PM2.5 concentrations in central and southwestern Taiwan, especially in Taichung and Kaohsiung. Compared to scenario I, the average annual concentrations of PM2.5 for scenario II and scenario III showed reductions of 20.1% and 28.8%, respectively. From the results derived from the simulation, it can be seen that control of NOx emissions may improve daily airborne PM2.5 concentrations in Taiwan significantly and control of directly emitted PM2.5 emissions may improve airborne PM2.5 concentrations each month. Nevertheless, the results reveal that the preliminary control plan could not achievethe air quality standard. Therefore, the efficacy and effectiveness of the control measures must be considered to better reduce emissions in the future.

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