Crumb-Rubber Modified Asphalt Paving
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Crumb-Rubber Modified Asphalt Paving occupational exposures and acute health effects

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Published by U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, National Technical Information Service, distributor in [Atlanta, Ga.?], [Springfield, Va .
Written in English


  • Sick building syndrome -- Massachusetts -- Stoughton.,
  • Indoor air pollution -- Environmental aspects -- Massachusetts -- Stoughton.

Book details:

Edition Notes

StatementGregory A. Burr [et al.].
SeriesNIOSH health hazard evaluation report -- HETA 2001-0536-2864.
ContributionsBurr, Gregory A., National Institute for Occupational Safety and Health.
The Physical Object
Paginationviii, 42 p. :
Number of Pages42
ID Numbers
Open LibraryOL17719032M

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The only remaining potential market for using scrap tyres is crumb rubber modified material for asphalt paving. Modified asphalt paving products with crumb rubber can be made by several techniques, including wet process (binder modification by finely ground rubber) and dry process (part of aggregate replaced by rubber crumb). Design and Construction of Asphalt Paving Materials with Crumb Rubber Modifier MICHAEL HEITZMAN This document is a concise overview of the terminology, proc­ esses, products, and applications of rubber modifier (CRM) technology. Thls technology includes any use of scrap tire rubber in asphalt paving   Crumb rubber modifier (CRM) used in asphalt, also known as Crumb Rubber Modified Bitumen (CRMB) road pavement mix had stress absorbing mem-branes that reduce the reflective cracking because of its elastic properties. With less cracks, there are fewer repairs, so crumb rubber assists in reducing main-tenance :// FHWA continues to encourage the use of waste tire rubber in engineering applications, including asphalt paving, where it is both cost effective and it can be properly engineered. States are not required to use crumb rubber in asphalt paving, but, when requested, FHWA provides technical assistance and will continue to provide technology ://

  crumb rubber in asphalt paving has gained popularity due to the improved mechanical and functional performance of CRM asphalt mixtures as well as the proficient way of dealing with this waste product (Epps, ). CRM asphalt paving products can be made by several techniques, including a wet process and a dry process. In the wet process, CRM Rahman   Crumb rubber modified bitumen (CRMB) was used in numerous asphalt paving projects in all 50 states of the Unites States from to due to a federal government mandate. Most states discontinued the routine use of CRMB after the mandate was repealed in   crumb rubber modifier (CRM) in road paving materials. In general these approaches are at the present time classified as the dry method and the wet method (3). The wet method involves dispersing the CRM particles into the asphalt cement to produce what is called asphalt rubber (AR) which in turn is used to produce hot-mix asphalt Thus, the recycling and reuse of crumb rubber (CR) produced from automotive and truck scrap tyres have become significantly important to the environment (Presti, ). One of the best applications of CR is to use it as an asphalt modifier. A significant amount of studies have been carried out to assess the performance of CR modified asphalt

  Paving applications that use crumb rubber include seal coats (or chip seals), hot mix asphalt pavement (or flexible pavement) and crack sealer. Refer to TxDOT specification Item for several requirements for tire rubber, crumb rubber-modified asphalt and   Evaluation of Crumb Rubber Modified Asphalt Paving: Occupational Exposures and Acute Health Effects Between and , the National Ins titute for Occupational Safety and Health (NIOSH), with help from the Federal Highway Administration, studied asphalt pa ving workers at seven road paving sites in the :// 2. Recycled Tyre Rubber Modified Bitumens (RTR-MBs) Geography of RTR-MBs in road asphalt mixtures. Since the invention of McDonald, the wet process technology has been used and modified more widely in four states in the US: Arizona, California, Texas, and Florida. More recently wet process has been used also in South Carolina, Nevada and   The RPA Technical Advisory Board (TAB) is made up of the nation’s leading experts on Crumb Rubber Modified Asphalt Pavements as highly regarded Agency/DOT Engineers, P.E.’s and Ph.D.’s with many years of field