Reclaimed asphalt pavement rap is a useful alternative to virgin materials because it reduces the need to use virgin aggregate, which is a scarce commodity in. Bituminous road, marshall mix design, reclaimed asphalt pavement, optimum bitumen content 1. Reclaimed asphalt pavement rap and reclaimed asphalt shingles ras are readily available commodities that agencies and contractors can use to reduce the consumption of natural resources, improve their environmental position, and reduce the construction. The primary goal of this study was to investigate the environmental impacts of reclaimed asphalt pavement rap while it is freshly processed i.
Feasibility of reclaimed asphalt pavement rap use as road. Pdf strength development of recycled asphalt pavement. These materials are generated when asphalt pavements are removed for reconstruction, resurfacing, or to obtain access to buried utilities. Pdf on oct 1, 2012, yu chen and others published use of reclaimed asphalt pavement in concrete pavement slabs. Chapter six conclusions use of reclaimed asphalt pavement. Asphalt pavement association napa is to increase the average rap content to 25% by the end of 20. Reclaimed asphalt pavement rap which is a reuse of old asphalt concretes as the aggregate base for new asphaltic concrete. This packet provides information about how and why to use reclaimed asphalt pavement rap in roadway construction and maintenance projects. Abiero gariy 4 1 civil engineering department, pan african university institute for basic sciences, technology and innovation pausti, 62000 00200 nairobi, kenya. Using rap in pavement construction has now become most common.
Pavement recycling guidelines for state governments, fhwasa97, 1997. Department use of reclaimed asphalt pavement rap during fy 1992. More than 60 million tons of asphalt pavement material is reclaimed each year during road widening and resurfacing projects, and nearly all of that material is reused. It is generated when pavement from old roads, parking lots and.
Three rap materials were obtained from 3 plants throughout new jersey. However, some research has been conducted on the feasibility and potential environmental impact of using milled asphalt as fill material for bridge approaches and similar applications. Recycled asphalt pavement saving pavement saving money saving the environment dudley bonte, riethriley becky mcdaniel, north central superpave center indiana ltap asphalt workshop november 12, 2009 1. Our rap is typically crushed down to 38 minus size, but can be produced to meet any size specification. Environmental impacts of reclaimed asphalt pavement rap. Reclaimed asphalt pavement the texas department of. Recycling of asphalt pavements is a valuable approach for technical, economical, and environmental reasons kennedy et al. The testing of the rap, rca, and their blends with the base material, showed that as the % rap increased in the blend, both the cbr value and permeability decreased.
Introduction rap is a method by which bituminous pavements are constructed using reclaimed materials obtained from existing pavements. While the state of illinois has been recycling reclaimed asphalt pavement rap material into hotmix asphalt hma since 1980, there continues to be questions regarding the correct approach to. Reclaimed asphalt pavement rap is the term given to removed andor reprocessed pavement materials containing asphalt and aggregates. Assessing increased use of reclaimed asphalt pavement in. However, the mix plant, the degree of mixing and the transfer of heat from the new aggregate to the reclaimed material. The huge amount of reclaimed asphalt pavement rap obtained from damaged or abandoned pavement. Reclaimed asphalt pavement an overview sciencedirect topics. Experimental investigation on engineering properties of. Reclaimed asphalt pavement is most commonly used in construction and maintenance applications. Environmental impacts of reclaimed asphalt pavement. Reclaimed asphalt pavement the national academies press. Stephen lane associate principal research scientist g. The illinois department of transportations current method of rap hma design provides 100% contribution for the residual asphalt binder from the rap based on. Reclaimed asphalt pavement rap is a useful alternative to virgin materials because it reduces the.
May 15, 2015 beneficial use of reclaimed asphalt grindings background reclaimed asphalt pavement rap is a common term used for removed andor reprocessed pavement materials containing a mixture of petroleumderived asphalt and mineral aggregates gravel and sand. Most reclaimed asphalt pavement materials, when used as a total substitute for natural aggregates in base applications, does not meet the minimum requirements of standards. Reclaimed asphalt pavement rap existing pavements removed and reused produced by milling upper pavement layers removed and replaced with new pavement fulldepth removal pavement completely removed and reprocessed 3. Number ec188 october 2014 application of reclaimed asphalt pavement and recycled asphalt shingles in hotmix asphalt national and international perspectives on current practice january 12, 2014 washington, d. Rap is therefore made up of quality aggregates coated with asphalt cement. Reclaimed asphalt pavement rap being generated mainly from pavement milling construction projects. While the state of illinois has been recycling reclaimed asphalt pavement rap material into hotmix asphalt hma since 1980, there continues to be. Pdf utilizing reclaimed asphalt pavement rap materials in. Reclaimed asphalt pavement rap in asphalt mixtures. With increased demand and limited aggregate and binder supply, hot mix asphalt hma producers discovered that reclaimed asphalt pavement rap is a valuable component in hma. Introduction hot mix recycling is the process in which reclaimed asphalt pavement materials are combined with new materials, sometimes along with a recycling agent, to produce hot mix asphalt hma mixtures. Reclaimed asphalt pavement rap is a common term used for removed andor reprocessed pavement materials containing a mixture of petroleumderived asphalt and mineral aggregates gravel and sand. As a result, there has been renewed interest in increasing the amount of rap used in hma.
Reclaimed asphalt pavement material description user. Microstructural development was examined via xrd and sem analyses. Number ec188 october 2014 transportation research board. Speight phd, dsc, in asphalt materials science and technology, 2016. National pavement preservation conference 2016 nashville, tn october 12, 2016 donald matthews, pe pavement recycling systems, inc.
In such cases, stabilization with stabilizers like cement allows the use of these low quality reclaimed asphalt pavement materials with the minimum required. Reclaimed asphalt pavement rap as a clean fill material. Although a few people in the pavement community have a negative perception about using reclaimed asphalt pavement materials in new asphalt mixes, mixes with moderate to high rap contents are not inferior paving products. Milled asphalt frequently referred to as recycled asphalt pavementor rap is commonly mixed with hot mix asphalt and reused in paving projects.
The effect of incorporating reclaimed asphalt pavement on. Reclaimed asphalt aggregate raa which is a product of a specialized method to produce reclaimed coarse aggregate and recycled asphalt granules from waste asphalt concrete and concrete dust. Since 2007, increasing material costs and a growing awareness of the quantity of rap available for use have sparked interest in allowing asphalt. Evaluation of fly ash fa based geopolymer stabilized recycled asphalt pavement rap. Rap is the material produced by cold milling or crushing an existing hotmix asphalt hma pavement. Reclaimed asphalt pavement rap is defined as removed pavement materials containing asphalt and aggregates. National academies of sciences, engineering, and medicine. Reclaimed asphalt pavement rap, also called recycled asphalt pavement is the standard term for removed andor repro cessed pavement materials. Director, center for research and education in advanced transportation engineering systems creates rowan university. Characterization of agglomeration of reclaimed asphalt. Reclaimed asphalt pavement rap environment fact sheet 7. Trbs national cooperative highway research program nchrp synthesis 495. Use of reclaimed asphalt pavement and recycled asphalt. The pavement may be removed for various reasons including resurfacing or reconstruction.
Associate principal research scientist sameer shetty engineering associate introduction. A copy of the reclaimed asphalt pavements order 2014, or a link to the epa website where the reclaimed asphalt pavements order 2014 can be found. Penndot seeks to economically, efficiently, and qualitatively recycle more rap back into pavements including the use of higher rap content in asphalt mixes, to explore additional beneficial uses of rap materials generated, and to evaluate recent. Reclaimed asphalt pavement rap, marshall stability, density, moisture resistance. State of the practice stateofthepractice information on including higher amounts of rap in asphalt mixtures. Due to repetition of wheel load and edging effect bituminous concrete tense to wear and tear.
Use of reclaimed asphalt pavement rap under superpave. Reclaimed asphalt pavement rap is produced from milled or ripped off old asphalt pavement. High reclaimed asphalt pavement use with changes in construction materials economics, stricter environmental regulations, and an emphasis on a. Asphalt pavement recycling with reclaimed asphalt pavement. Use of reclaimed asphalt pavement and recycled asphalt shingles in asphalt mixtures summarizes current practices for the use of reclaimed asphalt pavement rap and recycled asphalt shingles ras in the design, production, and construction of asphalt mixtures.
The performance and life of pavement containing up to 30 percent rap is similar to virgin pavements with no rap. The illinois department of transportations current method of rap hma design provides 100% contribution for the residual asphalt binder from the rap based on solvent extractions. Pavement recycling executive summary and report, fhwasa95060, 1996. Appropriate procedures must be adopted and documented to minimise the potential to receive or process reclaimed asphalt pavement containing asbestos or detectable quantities of coal tar1. Pdf performance evaluation of reclaimed asphalt pavement. Reclaimed asphalt pavement rap fhwa us department of. The asphalt industry remains the countrys most diligent recycler with more than 99 percent of reclaimed asphalt pavement being put back to use. Rap reclaimed asphalt pavement is the material obtained after asphalt pavement is removed and reprocessed.
Leaching characteristics of recycled asphalt pavement. Pdf recently, prices of asphalt pavement materials have been increasing tremendously, which led to attempts to find alternative cheap. Reclaimed asphalt pavement rap and reclaimed asphalt. It is commonly collected in loose granular form as a byproduct of pavement rehabilitation or reconstruction and has been widely used in new asphalt pavement as granular basesubbase course when pulverized or as additional aggregate in hot recycling or cold. It is commonly collected in loose granular form as a byproduct of pavement rehabilitation or reconstruction and has been widely used in new asphalt pavement as granular basesubbase course when pulverized or as additional aggregate in hot recycling or cold recycling. If reclaimed asphalt pavement is incorporated into the mix, it is usually mixed in the laboratory until thoroughly heated and blended with the new aggregate. Pdf the effect of incorporating reclaimed asphalt pavement. Testing was also conducted on reclaimed asphalt pavement rap and reclaimed concrete aggregate rca to evaluate their potential use as base and subbase materials.
Pdf optimizing recycling reclaimed asphalt pavement rap. Application of reclaimed asphalt pavement and recycled asphalt. Rap is the material resulting from cold milling or crushing an existing hotmix asphalt hma pavement. Pdf use of reclaimed asphalt pavement in concrete pavement slabs.
Feasibility of reclaimed asphalt pavement rap use as road base and subbase material edward j. A manual for design of hotmix asphalt with commentary. Feasibility of reclaimed asphalt pavement rap use as. The processor must keep a written record of the following for a period of six years. Introduction recycling hot mix asphalt hma material results in a reusable mixture of aggregate and asphalt binder known as reclaimed asphalt pavement rap. Reclaimed asphalt pavement rap is a useful alternative to virgin materials because it reduces the need to use virgin aggregate, which is a scarce commodity in some areas of the united states. Introduction reclaimed asphalt pavement rap is the term given to removed andor reprocessed pavement materials containing asphalt and aggregates. Recycling asphalt pavement creates a cycle of reusing materials that optimizes the use of natural resources. While the state of illinois has been recycling reclaimed asphalt pavement rap material into hotmix asphalt hma since 1980, there continues to be questions regarding the correct approach to design hma with rap.
Specifically, this regional project looked at typical materials from the north central united states to determine if the findings of nchrp 912 were valid for midwestern materials and to. Role of l, naohna 2 sio 3, fa, and curing temperature and duration are investigated. Reclaimed asphalt pavement and reclaimed asphalt shingles shall be according to the following. Reclaimed asphalt pavement rap as a clean fill material the asphalt pavement industry is americas biggest recycler. When properly crushed and screened, rap consists of highquality, well.