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In light of requirements that rubber be mixed with any asphalt used in projects receiving federal aid beginning in 1994, and the general increase in the problem of what to do with waste material, 17 papers from a December 1992 symposium in Miami discuss some of the technical and economic considerati
Waste material management is becoming a very difficult challenge due to the lack of proper disposal facilities and processes as well as the environmental considerations associated with same. The objective of this paper was to research and report on the potential specific disposal of waste materials by usage in Hot Mix Asphalt Concrete (HMAC) mixtures. First, a search was made to identify all possible waste materials that may have potential for usage in an HMAC mixture. Secondly, all the fifty State Departments of Transportation and the District of Columbia were polled in order to establish their most current status on research and usage. Waste materials identified in this work included Reclaimed Asphalt Pavement (RAP), waste rubber and rubber tires, various slag and ash products and glass. The poll also identified those states or government agencies which are using waste materials as a matter of answering to existing or future legislative mandates.
This book presents a new way of viewing contaminated soil-as a resource that in many instances can be recovered. The Reuse and Recycling of Contaminated Soils addresses the waste problem associated with contaminated soil and considers alternatives that are environmentally sound, cost-effective, and time efficient. It provides thorough coverage of practical issues associated with reuse and recycling including:
This is the first ever text-cum-reference book in India on “Bituminous Road Construction”. It includes references to the codes and specifications of the Indian Roads Congress and the Bureau of Indian Standards (BIS), besides the international standards such as ASTM and AASHTO. This book provides a thorough knowledge of bituminous road construction such as bitumen; aggregate; mix design; special mixes such as stone matrix asphalt and warm mix asphalt; structural design of flexible pavements; asphalt production and construction; distresses in asphalt pavements; maintenance and rehabilitation of asphalt pavements including recycling; and interesting investigations of premature failure of asphalt pavements across the world. It includes a large number of photographs for easy comprehension of the subject matter. This book has been designed to serve as a text for the undergraduate and postgraduate students of Civil Engineering for the courses on: Highway Materials including Testing Laboratory; Asphalt Mix Design; Highway Construction and Maintenance; Highway Pavement Failures; and Design of Flexible Pavements. Cutting-edge technology on bituminous road constructions, included in the book, helps M.Tech and Ph.D. students in conducting research in this field. Since over 95% of highways have bituminous surface, this book is also an ideal reference for thousands of practicing highway engineers who are engaged in the most ambitious highway construction programme ever in India. Highlights of the Second Edition: • Incorporates cutting-edge technology on the topics covered • Includes new sections on bitumen chemistry; durability of bitumen; Balanced Mix Design (BMD); asphalt mix characterization; perpetual pavements; QC/QA in India; and rehabilitation of distressed concrete pavements with bituminous overlays; and life cycle costs of bituminous versus concrete pavements. TARGET AUDIENCE • B.Tech Civil Engineering • M.Tech Highway Education • Practicing Highway Engineer
The use of recycled fibers in asphalt mixtures was found to be beneficial in some cases only such as when fishing nets were used. The final conclusion of the program was to pursue a systematic study primarily based on using the Superpave design schedule. The final approach was to use virgin fibers first to clearly understand how fibers affect the mechanical properties of the mixture, and then apply the results to the use of recycled fibers -- all the work was to follow the Superpave design approach. A comprehensive review of the results is included in this report.
TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.