Download or read book Inspection of Rubberized Asphalt Concrete written by and published by . This book was released on 2005 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Construction and Testing of Crumb Rubber Modified Hot Asphalt Pavement written by Gayle E. Albritton and published by . This book was released on 1996 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review of Crumb rubber Modified Asphalt Concrete Technology written by A. T. Papagiannakis and published by . This book was released on 1995 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Testing of Asphalt Concrete Containing Crumb Rubber Modifier and Warm Mix Additives written by and published by . This book was released on 2014 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Utilisation of scrap tire has been achieved through the production of crumb rubber modified binders and rubberised asphalt concrete. Terminal and field blended asphalt rubbers have been developed through the wet process to incorporate crumb rubber into the asphalt binder. Warm mix asphalt technologies have been developed to curb the problem associated with the processing and production of such crumb rubber modified binders. Also the lowered production and compaction temperatures associated with warm mix additives suggests the possibility of moisture retention in the mix, which can lead to moisture damage. Conventional moisture sensitivity tests have not effectively discriminated good and poor mixes, due to the difficulty of simulating field moisture damage mechanisms. This study was carried out to investigate performance properties of crumb rubber modified asphalt concrete, using commercial warm mix asphalt technology. Commonly utilised asphalt mixtures in North America such as dense graded and stone mastic asphalt were used in this study. Uniaxial Cyclic Compression Testing (UCCT) was used to measure permanent deformation at high temperatures. Indirect Tensile Testing (IDT) was used to investigate low temperature performance. Moisture Induced Sensitivity Testing (MiST) was proposed to be an effective method for detecting the susceptibility of asphalt mixtures to moisture damage, as it incorporates major field stripping mechanisms. Sonnewarm(TM), Sasobit(TM) and Evotherm(TM) additives improved the resistance to permanent deformation of dense graded mixes at a loading rate of 0.5 percent by weight of the binder. Polymer modified mixtures showed superior resistance to permanent deformation compared to asphalt rubber in all mix types. Rediset(TM) WMX improves low temperature properties of dense graded mixes at 0.5 percent loading on the asphalt cement. Rediset LQ and Rediset WMX showed good anti stripping properties at 0.5 percent loading on the asphalt cement. The American Association of State Highway and Transportation Official's Mechanistic-Empirical Pavement Design Guide (AASHTO MEPDG) software was used to predict long term low temperature performance of the mixtures in various areas of Ontario. Sasobit, Rediset LQ and Rediset WMX gave good 15 years prediction with stone mastic asphalt mixtures but the performance of dense graded mixtures was less satisfactory.
Download or read book Evaluation of Recycled Rubber in Asphalt Cement Concrete written by Edward Engle and published by . This book was released on 2002 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Roughly 242 million used tires are generated annually in the United States. Many of these tires end up being landfilled or stockpiled. The stockpiles are unsightly, unsanitary, and also collect water which creates the perfect breeding ground for mosquitoes, some of which carry disease. In an effort to reduce the number of used tire stockpiles the federal government mandated the use of recycled rubber in federally funded, state implemented department of transportation (DOT) projects. This mandate required the use of recycled rubber in 5% of the asphalt cement concrete (ACC) tonnage used in federally funded projects in 1994, increasing that amount by 5% each year until 20% was reached, and remaining at 20% thereafter. The mandate was removed as part of the appropriations process in 1994, after the projects in this research had been completed. This report covers five separate projects that were constructed by the Iowa Department Of Transportation (DOT) in 1991 and 1992. These projects had all had some form of rubber incorporated into their construction and were evaluated for 5 years. The conclusion of the study is that the pavements with tire rubber added performed essentially the same as conventional ACC pavement. An exception was the use of rubber chips in a surface lift. This performed better at crack control and worse with friction values than conventional ACC. The cost of the pavement with rubber additive was significantly higher. As a result, the benefits do not outweigh the costs of using this recycled rubber process in pavements in Iowa.
Download or read book Installation and Early Performance of a Field Test Section of Asphalt Rubber Concrete written by G. W. Maupin and published by . This book was released on 1991 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt rubber, which is produced by reacting asphalt cement and crumb rubber, is claimed to increase fatigue life and reduce rutting of asphalt concrete; however, the service life must be increased significantly to offset the additional coast of adding the rubber. In order to assess the performance of asphalt rubber mixtures and how effectively they can be used in construction, text sections of asphalt concrete surface courses using either asphalt rubber binder or the conventional binder were installed on a heavily traveled highway in Northern Virginia. Special equipment was required to blend the asphalt cement and crumb rubber; however, the production of the mixture and construction of the test sections were accomplished with minimal problems. Various laboratory tests including Marshall, gyratory shear, creep, resilient modulus, indirect tensile strength, and stripping were used to evaluate the mixtures in the laboratory. The results indicated that the asphalt rubber mixtures were more susceptible to permanent deformation than the same mixtures without rubber; however, the conventional temperature at which the mixtures were compacted and tested with the gyratory shear machine may not have presented a true estimate of performance because pavement deformation occurs at lower temperatures. Friction numbers of one section of asphalt rubber mixture were significantly lower at a 95 percent confidence level than friction numbers of the other asphalt rubber section, possibly the result of the pavement surface being filled by soil from a nearby construction project. However, there was no difference at a 95 percent confidence level between the average friction values of the control and asphalt rubber sections. Surveys of pavement performance, measurements of rut depth, and friction tests will be conducted periodically, and a final report will be published June 30,1994.
Download or read book Design and Construction of Asphalt Paving Materials with Crumb Rubber Modifier written by and published by . This book was released on 1992 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document is a comprehensive overview of the terminology, processes, products, and applications of crumb rubber modifier (CRM) technology. This technology includes any use of scrap tire rubber in asphalt paving materials. In general, CRM technology can be divided into two categories--the wet process and the dry process. When CRM is incorporated into an asphalt paving material, it will modify the properties of the binder (asphalt rubber) and/or act as a rubber aggregate (rubber modified hot mix asphalt). The five concepts for using CRM discussed in the report are McDonald, PlusRide, generic dry, chunk rubber asphalt concrete, and continuous blending asphalt rubber. An experimental work plan for monitoring performance and a stack emission testing program are also included.
Download or read book Laboratory Studies of Asphaltic Concretes Containing Asbestos Fibers Rubberized Asphalt and Epoxy resin Asphalt written by United States. Bureau of Reclamation and published by . This book was released on 1965 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study on uses of additives for improving asphaltic concrete for hydraulic construction showed that fine asbestos fibers (waste screenings) can be used advantageously. The increased compressive and tensile strength, stability, and erosion resistance properties gained with the fibers should provide a highly durable material capable of withstanding the major stresses that develop during service. Of the two rubberized asphalts tested, GRS and neoprene, it was indicated that the neoprene asphalt produced the better asphaltic concrete, particularly on the basis of stability and erosion resistance. Compared to the control, asbestos fibers, and rubberized asphalt mixes, the epoxy-asphalt concrete excelled in all physical properties determinations with the exception that flexibility was less than the rubberized asphalt mixes, and erosion resistance was comparable to the asbestos fiber mixes. The epoxy-asphalt concrete appears to be a very strong and tough material for hydraulic construction application; however, more data are required relative to its long-term weatherability. The relatively high cost of epoxy-asphalt approximately five times that of normal hot-mix, would restrict its use to special applications.
Download or read book Warm mix Asphalt Study written by David John Jones and published by . This book was released on 2013 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Uses of Recycled Rubber Tires in Highways written by Jon A. Epps and published by Transportation Research Board. This book was released on 1994 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis on the use of recycled rubber tires in highways will be of interest to administrators and policy-makers; pavement, materials, geotechnical, environmental, and traffic operations engineers; and research engineers involved with highway design and construction issues. Information is provided on the uses of rubber tires in asphalt paving materials as well as other uses, such as on fills and embankments, for erosion control and on railroad grade crossings. Specifically, information is included which identifies the agencies using or implementing applications for recycled rubber tires and defines the design parameters, technical and construction limitations, performance, costs, benefits, environmental limitations, specifications, and availability. This synthesis of information defines the use of recycled rubber tires in highways and is based on a review of nearly 500 references and on information recorded from state highway agency responses to a 1991 survey of practice. Updates are included for as much of the state practice information possible through 1993. The use of scrap tires for highway applications is dynamic with regard to policy and technical issues. Therefore, the reader should keep in mind that the information presented reflects the best available data at a particular time. The synthesis also identifies current research in the topic area, critical research needs, and legislative issues that affect application and use of recycled rubber tires.
Download or read book Accelerated Pavement Testing Phase I written by John Harvey and published by . This book was released on 1994 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Asphalt Concrete Plant Inspection Manual written by and published by . This book was released on 1985 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Warm mix Asphalt Study written by David Jones and published by . This book was released on 2011 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Mix Design Procedures for Gap graded Asphalt rubber Asphalt Concrete written by Anne Stonex and published by . This book was released on 2007 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: A research project was conducted to identify and document current modifications to ARIZONA 815c (75-blow Marshall method) used to develop gap-graded asphalt rubber asphalt concrete (GG AR AC) mix designs, and to develop and test improvements to provide a standard mix design method for use by contractors and consultants. Based on field performance data provided by the Arizona Department of Transportation (ADOT), the existing mix design method was successful and should serve as the standard for comparison of proposed improvements. Best practices were synthesized to develop proposed improvements. Three aggregate sources and two asphalt rubber (AR) binders were used for initial testing of the existing (control) mix design method and of the proposed changes. Rebound of compacted AR AC specimens was evaluated, as were Rice test results at 6% and 7% AR binder by weight of mix. The composition of the AR binders (rubber gradation and content) had more effect on the results than which mix design method was used. Additional replicate testing was performed by MACTEC and ADOT to confirm these findings. Changes to the AR AC mix design method consist primarily of making and curing Rice specimens in the same manner as Marshall specimens, tighter temperature ranges for mixing and compaction, incorporating Asphalt Institute calculations in a "User's Guide," and improving presentation. An ADOT construction project was used as an "acid test" to pilot the proposed mix design method and provide materials for a four-laboratory round robin to evaluate the precision of testing AR AC materials. The precision of round robin testing appears very similar to that of conventional asphalt concrete mixtures based on data from Proficiency Sample Programs of the AASHTO Materials Reference Laboratory and ADOT. The results indicate that the mix design method developed can be used by qualified laboratories to provide suitable AR AC mix designs
Download or read book Rubberized Asphalt Concrete written by Los Angeles County (Calif.). Department of Public Works and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effectiveness of Rubberized Asphalt in Stopping Reflection Cracking of Asphalt Concrete written by Larry DeLaubenfels and published by . This book was released on 1985 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Fibers and Rubber on the Physical Properties of Asphalt Concrete written by Jack L. Van Kirk and published by . This book was released on 1986 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
