DOCSLIB.ORG

Hazard Review Health Effects of Occupational Exposure to Asphalt

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Hazard Review Health Effects of Occupational Exposure to Asphalt SAFER HEALTHIER PEOPLE™ Hazard Review Health Effects of Occupational Exposure to Asphalt Roofing Paving Manufacturing E R V I N S CE A S . M U U S H A U.S. Department of Health and Human Services & H T Public Health Service L A E Centers for Disease Control and Prevention H F F O O National Institute for Occupational Safety and Health T T N N E E M M T R D D A A P P E HAZARD REVIEW HEALTH EFFECTS OF OCCUPATIONAL EXPOSURE TO ASPHALT Contributors: Mary Ann Butler, Ph.D. Gregory Burr, C.I.H. David Dankovic, Ph.D. R. Alan Lunsford, Ph.D. Aubrey Miller, M.D. Mimi Nguyen, M.P.H. Larry Olsen, Ph.D. Douglas Sharpnack, Ph.D. John Snawder, Ph.D. Leslie Stayner, Ph.D. Marie Haring Sweeney, Ph.D. Alexander Teass, Ph.D. Joann Wess, M.S. Ralph Zumwalde, M.S. U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES Public Health Service Centers for Disease Control and Prevention National Institute for Occupational Safety and Health December 2000 ORDERING INFORMATION To receive documents or other information about occupational safety and health topics, contact the National Institute for Occupational Safety and Health (NIOSH) at NIOSH—Publications Dissemination 4676 Columbia Parkway Cincinnati, OH 45226–1998 Telephone: 1–800–35–NIOSH (1–800–356–4674) Fax: 513–533–8573 E-mail: [email protected] or visit the NIOSH Web site at www.cdc.gov/niosh This document is in the public domain and may be freely copied or reprinted. Disclaimer: Mention of any company or product does not constitute endorsement by NIOSH. DHHS (NIOSH) Publication No. 2001–110 ii FOREWORD s part of its mandate to ”provide a safe and healthful workplace for working women and men,” the National Institute for Occupational Safety and Health (NIOSH) critically evaluates Athe scientific data on potentially hazardous occupational exposures or work conditions and makes recommendations that address measures for minimizing the risk from the hazard. This document, Hazard Review: Health Effects of Occupational Exposures to Asphalt, is an evaluation of the health effects and other relevant data that have become available since publication of the 1977 NIOSH document Criteria for a Recommended Standard: Occupational Exposure to Asphalt Fumes. It includes an assessment of chemistry, health, and exposure data from studies in animals and humans exposed to raw asphalt, paving and roofing asphalt fume condensates, and asphalt-based paints. Most important, the document serves as a basis for identifying future research to reduce occupational exposures to asphalt. The complex chemical composition of asphalt makes it difficult to identify the specific component(s) responsible for adverse health effects observed in exposed workers. Known carcinogens have been found in asphalt fumes generated at worksites. Observations of acute irritation in workers from airborne and dermal exposures to asphalt fumes and aerosols and the potential for chronic health effects, including cancer, warrant continued diligence in the control of exposures. NIOSH and its labor and industry partners are making great strides in reducing worker exposures to paving and roofing asphalt fumes. The partnership has succeeded because the partners set aside key differences to focus on the development of engineering and other control measures to reduce workplace exposures. A major success occurred when 100 percent of the asphalt paving industry voluntarily agreed to install new controls on all new highway pavers produced after July 1997— effectively reducing asphalt fume exposure. Other aspects of the partnership have encouraged collaborative laboratory and field research and the development of communication materials for workers and contractors on methods for reducing workplace exposures. Representatives of industry, labor, government, and academia met in Cincinnati, OH, on September 11 and 12, 2000, and identified research needed to assess completely the health risks associated with exposure to asphalt. Through these and other efforts of the partnership, effective workplace measures can be implemented to reduce worker exposure to asphalt fumes. Linda Rosenstock, M.D., M.P.H. Director, National Institute for Occupational Safety and Health Centers for Disease Control and Prevention iii CONTENTS Foreword ........................................................... iii Executive Summary..................................................... viii Contributors ........................................................... xiii Acknowledgments ...................................................... xiii Selected Abbreviations .................................................. xv Glossary of Terms ...................................................... xvi 1 INTRODUCTION ....................................... 1 1.1 Purpose ....................................................... 1 1.2 Scope......................................................... 1 2 BACKGROUND ........................................ 2 2.1 Number of Workers Potentially Exposed ............................. 2 2.2 Uses.......................................................... 2 3 PHYSICAL AND CHEMICAL PROPERTIES ...................... 4 3.1 Properties ..................................................... 4 3.2 Types and Uses of Asphalt ........................................ 5 3.2.1 Paving Asphalts .......................................... 5 3.2.1.1 Manufacturing Processes ............................ 5 3.2.1.2 Types, Uses, and Grades ............................. 6 3.2.2 Roofing Asphalts ......................................... 7 3.2.2.1 Manufacturing Processes ............................ 7 3.2.2.2 Types, Uses, and Grades ............................. 9 3.2.3 Asphalt-Based Paints ...................................... 10 3.3 Asphalt Modifiers and Additives ................................... 10 3.4 Asphalt Vapors and Fumes ........................................ 10 3.4.1 Cutback Asphalts, Emulsified Asphalts, and Asphalt-Based Paints . 10 3.4.2 Comparison of Vapors and Fumes from Paving and Roofing Asphalts . 12 3.4.3 Field-Generated Versus Laboratory-Generated Asphalt Fumes ...... 19 3.5 Analytical Sampling and Analysis Methods ........................... 20 3.5.1 Total and Respirable Particulates ............................. 20 3.5.2 Benzene-Soluble Fraction of Total Particulates .................. 20 3.5.3 Polycyclic Aromatic Hydrocarbons ........................... 21 3.5.4 Selected Solvent Methods ................................... 22 3.6 Conclusions.................................................... 23 4 EXPOSURE ............................................ 2 5 4.1 Methods for Analyzing Workplace Air and Dermal Exposures ............ 25 4.1.1 Total Particulates as an Indicator of Asphalt Fumes ............... 25 4.1.2 Benzene-Soluble Particulate Fraction .......................... 27 4.1.3 Polycyclic Aromatic Hydrocarbons and Polycyclic Aromatic Compounds .............................................. 27 4.2 Occupational Exposure Data, Air and Dermal Wipe Sampling ............ 28 4.2.1 NIOSH/FHWA Evaluation of Asphalt Paving Workers ............ 28 4.2.2 NIOSH Evaluation of Asphalt Paving among Tunnel Workers ...... 29 4.2.3 Cross-Sectional Occupational Exposure Assessment Study ......... 29 4.2.4 Exxon Cross-Sectional Evaluation of Asphalt Workers ............ 33 4.2.5 Occupational Dermal Exposures .............................. 35 4.2.6 Summary ................................................ 36 4.3 Biomarkers .................................................... 36 4.3.1 Urinary Thioethers ........................................ 37 4.3.2 Urinary Glucaric Acid ...................................... 37 4.3.3 Mutagenic Activity in Urine ................................. 38 4.3.4 Sister Chromatid Exchange .................................. 39 4.3.5 Urinary 1-Hydroxypyrene ................................... 39 4.3.6 DNA Adducts ............................................ 41 4.3.7 Conclusions .............................................. 42 5 HUMAN HEALTH EFFECTS ................................. 47 5.1 Acute Health Effects ............................................. 47 5.1.1 Health Effects Associated with Asphalt Exposures during Paving . 47 5.1.2 Health Effects Associated with Asphalt Exposures in the Roofing Industry ............................................... 51 5.1.3 Health Effects Associated with Asphalt Exposure among Roofers and Pavers ............................................. 52 5.1.4 Health Effects Associated with Asphalt Exposures in Other Occupations . 53 5.1.5 Health Effects among Asphalt Workers Reported in Other Studies . 55 5.1.6 Conclusions ............................................. 57 5.2 Chronic Health Effects ........................................... 58 5.2.1 Pavers ................................................. 59 5.2.1.1 Cohort Studies .................................... 59 5.2.1.2 Case-Control Studies ............................... 69 5.2.2 Roofers ................................................ 69 5.2.2.1 Cohort Studies .................................... 69 5.2.2.2 Case-Control Studies ............................... 71 5.2.3 Meta-analysis of Asphalt Workers and Roofers ................. 72 5.2.4 Other Studies of Asphalt Exposure ........................... 73 5.2.4.1 Cohort Studies .................................... 73 5.2.4.2 Case-Control Studies ............................... 73 5.2.5 Conclusions ............................................. 75 5.2.5.1 Lung Cancer among Pavers .......................... 75 5.2.5.2 Lung Cancer
Load more

Recommended publications
  • (Vocs and Svocs) from Warm Mix Asphalt Incorporating Natural Zeolite and Reclaimed Asphalt Pavement for Sustainable Pavements
    sustainability Article Evaluation of Reductions in Fume Emissions (VOCs and SVOCs) from Warm Mix Asphalt Incorporating Natural Zeolite and Reclaimed Asphalt Pavement for Sustainable Pavements Javier Espinoza 1,2 , Cristian Medina 1,2, Alejandra Calabi-Floody 3 , Elsa Sánchez-Alonso 3 , Gonzalo Valdés 3 and Andrés Quiroz 1,2,* 1 Chemical Ecology Laboratory, Department of Chemical Sciences and Natural Resources, University of La Frontera, Temuco 4811230, Chile; [email protected] (J.E.); [email protected] (C.M.) 2 Biotechnological Research Center Applied to the Environment (CIBAMA), University of La Frontera, Temuco 4811230, Chile 3 Department of Civil Works Engineering, University of La Frontera, Temuco 4811230, Chile; [email protected] (A.C.-F.); [email protected] (E.S.-A.); [email protected] (G.V.) * Correspondence: [email protected] Received: 26 September 2020; Accepted: 10 November 2020; Published: 17 November 2020 Abstract: Conventional asphalt mixtures used for road paving require high manufacturing temperatures and therefore high energy expenditure, which has a negative environmental impact and creates risk in the workplace owing to high emissions of pollutants, greenhouse gases, and toxic fumes. Reducing energy consumption and emissions is a continuous challenge for the asphalt industry. Previous studies have focused on the reduction of emissions without characterizing their composition, and detailed characterization of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) in asphalt fumes is scarce. This communication describes the characterization and evaluation of VOCs and SVOCs from asphalt mixtures prepared at lower production temperatures using natural zeolite; in some cases, reclaimed asphalt pavement (RAP) was used.
    [Show full text]
  • Characteristics of Oil Sands Products
    CHARACTERISTICS OF OIL SANDS PRODUCTS Heather D. Dettman Center for Spills in the Environment Oil Sands Products Training Portland, Maine December 4 & 5, 2012 2 Simplified —Oil Sands to Motor“ Value Chain Tailings Pipeline Transport Desalter Extraction Mining Pipeline Terminal Distillation W ater/Solids Primary Upgrading Removal Coking or Residue Performed at Upgraders DiluentAddition Hydrocracking Performed at Refineries In Situ Production Secondary Upgrading May be needed in future Catalytic Processing (Hydrogen) Refining Catalytic Processing (Hydrogen) Gasoline Diesel 3 Pipeline Definitions Transm ission Tailings Pipeline Transport Desalter Extraction Mining Pipeline Terminal Distillation Feeder W ater/Solids Primary Upgrading Removal Coking or Residue Performed at Upgraders DiluentAddition Hydrocracking Gathering Performed at Refineries In Situ Production Secondary Upgrading May be needed in future Catalytic Processing (Hydrogen) http://www.cepa.com /about-pipelines/types-of-pipelines Refining Catalytic Processing (Hydrogen) Gasoline Diesel 4 0hat Is Bitumen? ° Bitumen is the —extra heavy“ crude oil that remains after the biodegradation of oil in Northern Alberta ° Initial boiling point is 204°C/399.2°F ° Approximately 50wt% of the oil boils at temperatures below 524°C/975.2°F ° Biodegradation has resulted in organic acids being left behind in the oil ° Total acid number (TAN) is 3mg KOH/g which corresponds to an organic acid content of 3wt% in the oil ° Organic acid species in bitumen are relatively large molecules with 70wt% boiling
    [Show full text]
  • Secure Fuels from Domestic Resources ______Profiles of Companies Engaged in Domestic Oil Shale and Tar Sands Resource and Technology Development
    5th Edition Secure Fuels from Domestic Resources ______________________________________________________________________________ Profiles of Companies Engaged in Domestic Oil Shale and Tar Sands Resource and Technology Development Prepared by INTEK, Inc. For the U.S. Department of Energy • Office of Petroleum Reserves Naval Petroleum and Oil Shale Reserves Fifth Edition: September 2011 Note to Readers Regarding the Revised Edition (September 2011) This report was originally prepared for the U.S. Department of Energy in June 2007. The report and its contents have since been revised and updated to reflect changes and progress that have occurred in the domestic oil shale and tar sands industries since the first release and to include profiles of additional companies engaged in oil shale and tar sands resource and technology development. Each of the companies profiled in the original report has been extended the opportunity to update its profile to reflect progress, current activities and future plans. Acknowledgements This report was prepared by INTEK, Inc. for the U.S. Department of Energy, Office of Petroleum Reserves, Naval Petroleum and Oil Shale Reserves (DOE/NPOSR) as a part of the AOC Petroleum Support Services, LLC (AOC- PSS) Contract Number DE-FE0000175 (Task 30). Mr. Khosrow Biglarbigi of INTEK, Inc. served as the Project Manager. AOC-PSS and INTEK, Inc. wish to acknowledge the efforts of representatives of the companies that provided information, drafted revised or reviewed company profiles, or addressed technical issues associated with their companies, technologies, and project efforts. Special recognition is also due to those who directly performed the work on this report. Mr. Peter M. Crawford, Director at INTEK, Inc., served as the principal author of the report.
    [Show full text]
  • Sustainable Mining Practices - Recycling Concrete and Asphalt
    Sustainable Mining Practices - Recycling Concrete and Asphalt by Leah Gardner, Staff Environmental Scientist Recycling –Not Just for Bottles and Cans As we look for more ways to reduce, reuse, and recycle, we’re finding that the same principles already being applied to recycling beverage bottles and cans should be applied to many of the other materials we use. This includes many construction and demolition (C & D) materials, which make up an estimated 22 percent of California’s waste stream. Approximately 80% of all asphalt removed from roads in California is currently being recycled, a figure comparable to the recycling rate for bottles and cans. But with 100% potentially recyclable and reusable, our rate of reusing asphalt still has room for improvement. Many California mine operators help keep these materials out of landfills by crushing millions of tons of used concrete and asphalt salvaged from demolished infrastructure (roads, parking lots, buildings, etc.) to create recycled aggregates. When recycling asphalt, materials from other sources - such as rubber from used tires, asphalt roofing shingles, and blast furnace slag – are routinely recycled into the pavement mix. According to current information from CalRecycle, there are about 100 producers of recycled aggregate in California today. This recycled aggregate is in high demand for a variety of applications. Where the Rubber Hits the Road For each mile of road constructed, tons of rock, concrete, asphalt, and steel are needed. For example, each mile of a two-lane asphalt road constructed requires up to 25,000 tons of aggregate rock. Most recycled concrete is used for road base and most recycled asphalt (called “RAP” for recycled asphalt pavement) is returned to the roadway structure in some form.
    [Show full text]
  • Sulphur-Asphalt Pavement Technology: a Review of Progress Thomas W
    42 Transportation Research Record 741 USE OF STONE SCREENINGS AS struction have been discussed here. The overall ROADBASE AGGREGATE subject is very broad. Other applications of stone screenings include bedding materials, fillers, granulars stone screenings are used extensively in roadbase and for drain fields, fills, mixtures for de-icing, patches, subbase mixes and are used in combination with coarse slurry seals, surface treatment, and overlays. aggregate. This type of use reduces the cost of the combined product because the screenings do not have REFERENCES to be separated and reblended. The Bureau of Mines' statistics (.!) show that during 1977 more than 340 1. A. H. Reed. Stone in 1977. In Mineral Industry million Mg (375 million tons) of roadstone and roadbase Surveys. Bureau of Mines, U.S. Department of aggregates were used in the United states. The rea­ the Interior, annual prelim. ed., 1977. sons for that are basically two: (a) these combinations 2. E. A. McLean. A Comparative Analysis of are lower-cost construction materials, and (b) the ma­ Secondary Crusher Types. Presented at the 53rd terials are exceptionally good and suitable for base Annual Convention, National Crushed Stone As­ construction without stabilizing additives. sociation, Washington, DC, 1970. Screenings have been used in roadbase construction 3. F. A. Shergold. The Grading of Crusher Fines. ever since the first broken rock was produced by man. Roads and Road Construction, Vol. 35, No. 410, Due to modern technology available for mechanized Feb. 1957, pp. 36-40. construction, stone screenings for road construction 4. M. R. Thompson. Subgrade Stability. TRB, are being used to an even greater extent.
    [Show full text]
  • A Preliminary Investigation of the Feasibility of Spent Oil Shale As Road Construction Material
    A PRELIMINARY INVESTIGATION OF THE FEASIBILITY OF SPENT OIL SHALE AS ROAD CONSTRUCTION MATERIAL Gerald J. Gromko, University of Colorado at Denver The use of spent oil shale material as aggregate for flexible pavement con­ struction was investigated, and its suitability for use both in base courses and in bituminous surface courses is discussed. To assess the aggregate and asphalt-aggregate characteristics of spent shale the following tests were performed: the Los Angeles abrasion test, the dry sieve analysis, the specific gravity test, the Atterberg limits test, and the Hveem method of mix design. The results of the testing showed that the spent shale aggregate was well-graded, flat, angular, highly absorbent, friable, and nonplastic, has a rough surface texture, and wears relatively easily. The aggregate mixes tested by the Hveem stabilometer yielded high strength values and were relatively lightweight. The asphalt-spent shale mixtures studied showed very high total resistance (combination of stability and cohesiometer values) values, i.e., more than adequate load-carrying capability. How­ ever, the asphalt contents necessary for these very high strengths were also high. Based on the results of the tests performed, it seems apparent that this particular type of spent shale material might perform very well in flexible pavement structures. Although the material showed more than ade­ quate strength and stability, it may not stand up as well to the abrasive action of traffic on high-capacity roads and may be expensive because of the seemingly large amountofasphalt needed. However, this mixture might perform very well as a surface course layer for lower capacity roads (e.g., secondary roads).
    [Show full text]
  • Coal-Modified Tar Binders for Bituminous Concrete Pavements
    Coal-Modified Tar Binders for Bituminous Concrete Pavements EDMUND O. RHODES, Curtiss-Wright Corporation, Pittsburgh, Pennsylvania In Fall 1958, investigations were started by the Re• search Division of Curtiss-Wright Corp. at Quehanna, Pa., with a view to developing improved methods for using bituminous coals and products derived there• from as highway construction materials. It was decided to explore the possibility of making an improved binder for bituminous pavements of the hot-mix hot-lay type by dispersing coal in distilled coal tars and coal tar oils. Previous investigations had indicated that they might also be used to advantage for the production of improved highway binders. During the first half of 1959 a task force at Que• hanna assembled and constructed suitable laboratory and pilot plant equipment; determined optimum condi• tions for the dispersion of coal m tars and oils; com• pared various coals, tars, and oils as to their suita• bility for the purpose; produced and analyzed experi• mental quantities of coal-modified tar binders; and combined them with various aggregates in hot mixes. The latter were then compared with hot mixes con• taining typical asphalt cements and coal-tar binders. The tests appeared to indicate that it would be possible to make hot mixes with coal-modified tar cements equal or superior to those made with usual asphalt or coal-tar binders. After the results of the Quehanna investigations were reported, a contract was made with the Com• monwealth of Kentucky to build a pilot plant at Frank• fort to produce 150,000 gal of coal-modified tar binder for comparison with asphalt cements normally used in Kentucky in Class I and Class I-modified bitumi• nous pavements.
    [Show full text]
  • Safety Data Sheet
    SAFETY DATA SHEET SDS ID NO.: 0108MAR019 Revision Date 08/31/2016 1. IDENTIFICATION Product Name: Marathon Petroleum Asphalt Synonym: Asphalt Cement (ACs); Asphalt Flux; Penetration Grade Asphalts (Pen); Roofing Flux; Recycling Agents (RAs); Marathon PERFORMAC™ Asphalt Binder; PERFORMAC™ PG82-22PM; PERFORMAC™ 500; PG46-28; Performance Graded Asphalt Binder; PG46-34; PG52-28; PG52-28PM; PG52-34; PG58-22; PG58-28; PG58-34; PG58-34PM; PG64-22; PG64-28; PG64-28PM; PG64-28P; PG64-34PM; PG67-22; PG67-22X; PG70-22; PG70-22PM; PG70-22P; PG70-28PM; PG70-28P; PG76-22; PG76-22 PM; PG76-22P; PG76-28PM; PG64-22PM; PG82-22PM; PG76-22ARB; Asphalt; PG58H-28; PG64H-22; PG64H-22P; PG67H-22; PG58V-28; PG64V-22; PG67V-22; PG58E-28; PG64E-22; PG64E-22P; PG67E-22; Asphalt, PG76-22 0.25% Anti-strip Additive; PG Binders with WMA; PG Binders with AS-2000 Cross Link; AC-5; Marathon 0-10 Pen Asphalt; 85-100 Pen; 120-150 Pen; 150-200 Pen; S-180 Hard Pen Asphalt; Marathon SDA Bottoms; Solvent Deasphalted Residuum; 0 Pen Asphalt; 3 Pen Asphalt; 10 Pen Asphalt; AC-20; Vacuum Tower Bottoms; VTB; VB; Residuum Extract; Petroleum Asphaltenes; Residual Oil Solvent Extract; Residuum Extract; Light Saturant Asphalt; Polymer Modified Asphalt Concentrate; PMA Concentrate; 0307MAR019; 0316MAR019; 0142MAR019; 0169MAR020 Product Code: 0108MAR019 Chemical Family: Asphalt Recommended Use: Road Building & Other Service. Restrictions on Use: All others. Manufacturer, Importer, or Responsible Party Name and Address: MARATHON PETROLEUM COMPANY LP 539 South Main Street Findlay, OH 45840 SDS information (M-F, 8-5 EST): 1-419-421-3070 Emergency Telephone (24/7): CHEMTREC: 1-800-424-9300 CCN#: 13740 2.
    [Show full text]
  • Case Study Concrete Highways Highway 16 Intersection - Lloydminster, Ab
    CASE STUDY CONCRETE HIGHWAYS HIGHWAY 16 INTERSECTION - LLOYDMINSTER, AB PROJECT TEAM ENGINEERING CONSULTANT: EBA Engineering Consultants Ltd. CONTRACTOR: Alberta Asphalt SUB-CONTRACTORS: Proform Concrete Services Inc. CONCRETE SUPPLIER: Feldspar Excavating and RediMix OWNER: The City of Lloydminster THE OPPORTUNITY PROJECT DETAILS: Highway 16, part of the Trans-Canada Highway system, • Four Hwy 16 intersections at 52 Ave, 54 Ave, 70 Ave is a major inter-provincial and international trade corridor. and 75 Ave It passes through The City of Lloydminster and is a key • Lengths of 125 m, 100 m, 145 m, and 125 m component to the growth of the area’s heavy oil and oilsands respectively, side by side lanes industries. Increased heavy truck traffi c has led to severe • Widths of 7.9 m in each direction rutting at four signal-controlled intersections along this • 240 mm concrete pavement corridor. This was typically dealt with by milling and inlaying • Flexural strength of 4.2 MPa or rut fi lling with standard asphalt mixes. In Lloydminster, • Dowels at 4.5 m joints with tie bars at 900 mm between this would last only two to four years. lanes THE SOLUTION The City of Lloydminster wanted to fi nd a durable pavement ABOUT THE CEMENT ASSOCIATION OF CANADA (CAC) solution with minimized maintenance and extended The CAC is the voice of Canada’s cement industry. A vital contributor to service life. Similar problem areas in Edmonton, Medicine the country’s economy and infrastructure, the industry provides a reliable, domestic supply of cement required to build our country’s sustainable Hat and Grande Prairie have shown concrete pavement communities and is committed to the environmentally responsible to be a suitable solution for heavy truck and high traffi c manufacturing of cement and concrete products.
    [Show full text]
  • Coal Tar Vs Asphalt Emulsion
    MTe P Sk WHAT IS PITCH BLACK®? Pitch Black® is a custom rubberized asphalt emulsion blended with select minerals, polymers and chemicals to produce the finest product. Each additive was selected for its characteristics that ultimately produce a sealcoat with the deepest and longest lasting color, firmest body, and greatest durability. It is extraordinarily tough, flexible and water repellent. The co-efficient of expansion and contraction of Pitch Black® asphalt pavement sealer is identical to that of asphalt pavement and has a natural affinity for bonding to asphalt pavement. Performance in the field and lab testing confirm the superiority of Pitch Black® over competitive products in the marketplace. Provides a non-slip surface for walkways, tennis courts, playgrounds, parking lots & traffic areas Seals in asphalt oils / seals out ultraviolet rays and water Fills in and smooths pavement voids Restores the surface to a rich, black color Non-toxic, non-tracking and easy to clean up Easy to apply - squeegee, broom, or spray application Protects your investment - prolongs the life of your asphalt pavement PITCH BLACK® VS COAL TAR Are you a coal tar advocate? Chances are, you’ve tried one brand of asphalt emulsion sealcoat and had a negative experience. We’ve heard about the fading, cracking, limited durability, etc. of asphalt emulsion products that hit the market and crashed. But did you know that Pitch Black® Asphalt Emulsion Sealcoathas been in the industry for almost 30 years? The West Coast has been using asphalt emulsion sealcoat since the 1980’s. Coal tar was abandoned by most West Coast contractors to avoid the risk of harmful health and environmental effects.
    [Show full text]
  • Asphalt Paving Materials Bituminous Materials
    Asphalt Paving Materials Bituminous Materials Bitumen—also known as asphalt or tar—is a black, oily, viscous form of petroleum, which is a naturally occurring organic byproduct of decomposed plants. Natural bitumen is the thickest form of petroleum there is, and is made up of 83% carbon, 10% hydrogen and lesser amounts of oxygen, nitrogen, sulfur, and other elements. CIVL 3137 2 Bituminous Materials Bituminous Materials Natural Tar & Petroleum Asphalts Pitch Asphalts (late 1800s)(late 1800s) (early 1900s) CIVL 3137 3 Natural Asphalt Rock Asphalt Asphalt Sand Native Asphalt CIVL 3137 4 Rock Asphalt Asphalt rock is formed when natural layers of petroleum harden in the pores of sedimentary rocks such as limestone or sandstone. Over time, the lighter components evaporate away leaving material that ranges in consistency from a thick liquid to a crumbly sand or stone. Only about 5% to 15% of the composition of asphalt rocks is asphalt. CIVL 3137 5 Rock Asphalt CIVL 3137 6 Rock Asphalt ROCK ASPHALT & OIL SHALE IN KENTUCKY CIVL 3137 7 Asphalt Sands Asphalt sands (also called oil or tar sands) are either loose sands or partially consolidated sandstone containing a mixture of sand, clay, water, and bitumen. It is increasingly used as a source for crude oil thanks to technological developments such as steam extraction. CIVL 3137 8 Asphalt Sands CIVL 3137 9 Asphalt Sands CIVL 3137 10 Asphalt Sands CIVL 3137 11 Native Asphalt Native asphalts are seepages of natural asphalt that rise to the surface from deeper oil-bearing rocks and collect in depressions on the ground surface.
    [Show full text]
  • Using Oil Shale Ash Waste As a Modifier for Asphalt Binders
    Using oil shale ash waste as a modifier for asphalt binders Khalid Ghuzlan, Ghazi Al-Khateeb & Abdullah Abu Damrah Journal of Material Cycles and Waste Management Official Journal of the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM) ISSN 1438-4957 Volume 15 Number 4 J Mater Cycles Waste Manag (2013) 15:522-529 DOI 10.1007/s10163-013-0135-8 1 23 Your article is protected by copyright and all rights are held exclusively by Springer Japan. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com”. 1 23 Author's personal copy J Mater Cycles Waste Manag (2013) 15:522–529 DOI 10.1007/s10163-013-0135-8 REVIEW Using oil shale ash waste as a modifier for asphalt binders Khalid Ghuzlan • Ghazi Al-Khateeb • Abdullah Abu Damrah Received: 19 September 2012 / Accepted: 12 March 2013 / Published online: 16 May 2013 Ó Springer Japan 2013 Abstract: Oil shale rocks represent one of the most Introduction available sources of energy.
    [Show full text]