Asphalt Rubber Technology Information Center
© 2015 - Rubber Pavements Association (RPA). All rights reserved.
Discarded Tires: Energy Conservation Through Alternative Uses
Scrap tires that are not recycled through retreading constitute a serious solid waste problem, but also offer energy conservation opportunities through their use as...
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Documentation of Open-graded, Asphalt-Rubber Friction Course Demonstration Project on Interstate 95, St. Johns County
The asphalt-rubber FC-2 mixture was produced and placed in the I-95 test sections without any major problem.  It can be considered as a successful demonstration
project even though...
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Economic Analysis of Rubber-Modified Asphalt-Mixes
The Alaska DOT and Public Facilities are presently evaluating the use of recycled rubber in hot mix pavement applications.  The benefits of adding rubber to the mix
include increased skid resistance under icy conditions, improved flexibility and crack...
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Economics of Seal Coating
Of course the primary requirement for a seal today, as well as in the past, is to apply one or more successive applications of asphalt binder and cover aggregate to a...
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Edge Drainage in Pavement Rehabilitation
Excess moisture in the pavement structure has long been recognized as a primary cause of pavement distress.  Moisture related flexible pavement failures are
characterized by excessive deflection, cracking, reduced...
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Effect of Mix Ingredients on Performance of Rubber-Modified Asphalt Mixtures
This research project consisted mainly of a laboratory study of mix properties as a function of variables, such as rubber gradation and content, void content, aggregate
gradation, mix process, temperature, and asphalt...
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Effect of Mix Ingredients on the Behavior of Rubber-Modified Asphalt Mixtures
This paper presents the results of a laboratory study to evaluate the effect of rubber gradation and content, air voids, aggregate gradation, mix, temperature, and
curing conditions on the properties of rubber modified ...
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Effectiveness of Rubberized Asphalt in Stopping Reflection Cracking of Asphalt Concrete (Interim Report)
A series of experimental rehabilitation techniques that include rubber-asphalt were constructed over an existing asphalt concrete pavement on Route 395 near
Ravendale, CA.  The experimental sections consisted of a dense graded ...
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Effects of Rubber Additives in Asphalt Concrete
This investigation on the effects of rubber additives in asphalt mixes was accomplished in three phases.  Initially, a research was made into the results of tests and uses
of this type of admixture by other agencies.  Secondly, the Materials ...
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Effects of Rubber on Asphalt Mixes
This project was conducted to develop an understanding of the behavior of asphalt concrete mixes that incorporate ground scrap tire rubber. The project focused
primarily on the behavior and performance of a mix that ...
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Effects of Stress Absorbing Membrane Interlayers
This paper will deal with the effect of stress absorbing membrane interlayers for the reduction of reflection cracking... Read More

Effects of the Ignition Method on Aggregate Properties
Accurate determination of the asphalt binder content is a fundamental quality control test for hot-mix asphalt concrete (HMAC).  Numerous tests for binder content have
been used with varying degrees of success...
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Eight-Year Performance Evaluation of an ARHM Pavement
In October 1980, the Connecticut DOT placed an experimental 900-ft section of asphalt-rubber hot mix bituminous pavement on state route 79 in Madison, CT.  Finely
ground rubber was supplied by the Arizona Refining Co. and was blended with the asphalt (grade AC-20) in the ratio of...
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Eleven-Year Pavement Condition History of Asphalt Rubber Seals in Phoenix, Arizona
After the development of asphalt rubber in Phoenix, AZ under the direction of Charles H. McDonald, from 1963 through 1970, the City of Phoenix began the placement
of 91.7 km of asphalt-rubber seals from 1971 through 1979.  These pavements have been evaluated periodically ...
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Engineering Aspects of Recycled Materials for Highway Construction - Final Report
This report presents an assessment of environmental aspects and engineering factors related to the utilization of recycled materials in highway construction.  A basic
overview and assessment of different technologies, processes, and methods for recycling of various materials into ...
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Establishing the California Department of Transportation Accelerated Pavement Testing Program
This report is on how the California Department of Transportation Accelerated Pavement Testing (CAL/APT) Program was established.  Discussion includes history of
the program, search for full-scale pavement testing technology suitable to California, results of a pilot project conducted on test pavements built in...
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Evaluating The Effects of the Wet and Dry Processes for Including Crumb Rubber Modifier in Hot Mix Asphalt
The conventional method of modifying asphalt cement with crumb Rubber Modifier is to blend and “react” ground CRM particles in the AC, prior to mixing with the
aggregate to produce hot mix asphalt.  This is known as the “wet process.”  The “dry process,” where CRM is added directly to the aggregate, has...
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Evaluating the Effects of Using Crumb Rubber Modifier in Hot Mix Asphalt with the Wet and Dry Processes
The objective is to compare the performance effects of adding CRM to HMA by the wet process versus the less expensive dry process, given the same CRM type, size
and amount.  Also this report compares both processes to a mix without CRM.  This is presented in table ...
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Evaluating the Use of Ponded Fly Ash in a Roadway Base Course
This paper summarizes findings of laboratory and field trial evaluations of ponded fly ash used as a component in a stabilized aggregate base course.  The paper also
reports upon the findings of a laboratory study relative to a hydrated lime stabilized pond ash mixture for use as a highway base or...
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Evaluating the Use of Waste Materials in Hot Mix Asphalt
The issue of waste management is becoming an ever-increasing problem in the United States and throughout the world.  Recent estimates are that 4.1 billion metric
tons of solid wastes are generated every year in our country – that’s about 14 tons for every man, woman, and child! Few of us really...
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