Select stabilizer based on cost, availability sufficient quantity, quality, suitability with respect to type and quality of material to be recycled, and desired design. Coldrecycling technologies such as fulldepth reclamation fdr are effective rehabilitation strategies that are proven to reduce environmental impacts, as well as construction costs and time. Although not a preservation strategy, full depth reclamation fdr is a proven alternative to traditional reconstruction. Fdr promotes the reuse of existing road materials and significantly reduces the use of fossil fuels and virgin resources such as aggregate and asphalt. An example of the sampling program suggested by wirtgen is shown in figure 1 below. Full depth reclamation fdr full depth reclamation fdr case histories. The full depth reclamation process is applicable to depths up to 12 in. Fulldepth reclamation of asphalt pavement is a rehabilitation method. Full depth reclamation fdr is an efficient means of rehabilitating these pavements. Fulldepth reclamation fdr center for transportation studies. Stabilized pavement bases, such as soilcement and cementtreated bases, have provided economical, longlasting pavement foundations for nearly 70 years. Full depth reclamation rubblizing asphalt asphalt magazine. Fdr is an inplace recycling method for reconstruction of existing flexible pavements using the existing pavement section material as the base for the new roadwaywearing surface.
Transverse cracks that extend through the depth of a slab occur due to temperaturemoisture variations. Full depth reclamation pulverized flexible pavement section creating a uniform stabilized base further stabilization obtained through. Ltppbind ltppbind, asphalt binder selection software, fhwa 16. This process has been used widely for over 20 years in texas to strengthen and widen. Fulldepth reclamation is a reclamation technique in which the full flexible pavement section and a predetermined portion of the underlying materials are uniformly crushed, pulverized, or blended, resulting in a stabilized base course. Fdr conserves materials by reusing pavement components. Full depth reclamation fdr, often known as pulverizing, is a rehabilitation technique. Fulldepth pavement reclamation, however, sidesteps many of these complications. Further stabilization may be obtained through the use of available additives.
Full depth reclamation federal highway administration. Save time, money, and the environment on your next asphalt paving project with fulldepth pavement reclamation. Chapter 9 fulldepth flexible pavement design chapter 9. A very popular reconstruction alternative is known as fulldepth reclamation fdr. In situ structural properties under fieldcured conditions material inputs for aashtoware. Cold recycled and reclaimed asphalt concrete properties. Item 8 asphalt emulsion stabilization full depth reclamation 2017.
The basesubbase layer was prepared by full depth reclamation fdr method. In this chapter, portland cement concrete pcc pavement distress types that require fulldepth repair are discussed, followed by the repair procedures. When total roadway reconstruction seems to be the only option, its time to consider full depth reclamation fdr. Fulldepth reclamation fdr of asphalt pavement is often used on rural roadways to reduce costs for materials and hauling. To help our clients, smes pavement experts turn to a process called fulldepth reclamation fdr. Rehabilitating an old pavement by pulverizing and stabilizing the existing pavement is a process referred to as full depth reclamation fdr. It removes deep pavement cracks thereby eliminating the potential for reflective cracking. Drawing on laboratory and field testing and on the improved software, researchers modeled geogridenhanced base courses for pavement use. The itasca software enhancements improved mndots ability to extend laboratory testing to recycled aggregate bases containing geogrids. Guide to fulldepth reclamation with cement ix streetpave design procedure 44 alternate pavement design assuming bonding between the slab and fdr layer 44 joint spacing 47 chapter 5 field sampling and mix design mixing49 obtain field samples 50 core or auger sampling 52 block samples 53 frequency of sampling 53 highways and airports 53. Full depth reclamation project professor cristina torres.
Deteriorating pavement is a constant problem for roads, parking lots and airports. Full depth reclamation is a technique in which the full flexible pavement section and a predetermined portion of the underlying materials are uniformly crushed, pulverized, or blended, resulting in a stabilized base course. Fulldepth reclamation a costeffective, durable option. What is full depth reclamation fdr full depth reclamation is a pavement rehabilitation technique in which the full flexible pavement section and a predetermined portion of the underlying materials are uniformly crushed, pulverized or blended. Fdr is an economical, inplace recycling alternative to road reconstruction. The process is achieved through pulverizing and mixing the existing base together with the existing asphalt. This project includes pavement resurfacing of various county roadways using full depth reclamation, asphalt concrete overlays, and remove and replace, as described below.
Fulldepth reclamation fulldepth reclamation with cement, or fdr, uses the old asphalt and underlying base material to build a new road. Other work consists of, as needed, adjusting utility covers, replacing. Pca the portland cement association americas cement. This information is critical in the structural design of pavements using the pavement mechanisticempirical design pmed. Paul mykytka, pe, pmp supervising engineer wsp usa.
Best practices for full depth reclamation asphaltpro. Pavement design in texas workshop event management. Item 7 full depth reclamation of hot mix asphalt pavement 2017. Full depth reclamation of asphalt pavements using asphalt emulsions. The stabilized layer becomes either the base or subbase of the new pavement structure. Full depth reclamation is a pavement rehabilitation technique in which the full flexible pavement section and a predetermined portion of the underlying materials are uniformly crushed, pulverized or blended. Also known as asphalt pulverization, fulldepth reclamation is a construction rehabilitation technique of removing the distressed layer of existing asphalt, blending it with the existing stone base, and creating a recycled usable base for the new asphalt.
Purchase design and control of concrete mixtures concrete sustainability hub. This procedure is meant to address deep structural problems ranging to depths as great as 12 in. Guide to fulldepth reclamation fdr with cement by david r. Officials aashto procedure for pavement design, for example, uses a structural layer coefficient to model base. In summary, full depth reclamation converts a wornout asphalt pavement into a stabilized base course. Other indications that a road could use fdr are frequent transverse and lateral cracking, reflective cracking, severe rutting. The guide provides a concise discussion of all aspects of selecting, designing, and constructing a reclaimed, cement stabilized asphalt base in preparation for a.
Once determined that a pavement is a good candidate for fulldepth reclamation, it must be evaluated. Fulldepth reclamation concrete construction magazine. The pavement performance is improved through better stabilization, building a stronger, lowmaintenance pavement that will. This comprehensive training session is presented by industry pavement design experts. It uses a powerful reclaiming machine to turn an old asphalt pavement into a road base by uniformly pulverizing that full thickness of the old pavement and blending it with a portion of underlying material. This report provides design guidance, standardized plans and. Methods in use are marshall, superpave, wirtgen wirtgen 2004, proctor aashto t99, modified proctor kim and labuz 2007, and unconfined compressive strengths. Full depth reclamation fdr is one of the three major types of asphalt recycling techniques. Advantages of fulldepth pavement reclamation asphalt. Fulldepth reclamation with cement 28th annual regional local roads conference. Also known as mix and mill, full depth reclamation is a costeffective repair process for parking lots and roads that suffer from base problems. Fulldepth reclamation fdr of asphalt pavements is a rehabilitation technique where the existing asphalt pavement some, or all, of the base course, and some of the subgrade are uniformly pulverized and blended to form a new, homogenous base course.
The concrete pavement industry has prepared a new, free online design software unifying the entire spectrum of industry pavement thickness design methods for the many different applications of concrete pavements and overlays. Fulldepth reclamation uses the materials from the deteriorated asphalt pavement, and, with the addition of cement, creates a new stabilized base. Best practices for fulldepth reclamation using asphalt emulsions background 5 mixture designs for fdr projects stabilized with emulsion are varied. This evaluation is to determine what materials make up the current pavement structure and what mix design will be used in the reclamation process. Paul was responsible for field visits, analysis of existing pavement conditions, and design of full and partial depth patching, pavement overlays, fulldepth reclamation, cold central plant. Mgpec pavement design standards and construction specification manual. To navigate through the ribbon, use standard browser navigation keys. The full ac and a predetermined portion of the base, subbase, andor native soil is expertly pulverized and blended with carefully selected stabilizing additives. Maintenance schedule for cement additive sfdr design. The process uses a machine called a reclaimer or pulverizer that is equipped with an 8footwide mandrel cutting wheel. In concrete pavement contraction design cpcd, the following distresses require fdr. Guide to fulldepth reclamation fulldepth reclamation. Fdr is considered when the pavement is highly deteriorated or has deep cracking due to design deficiencies or an inadequate base. Darwinme darwinme, pavement design and analysis software, aashtoware 14.
Many engineers and public works officials are turning to a process called fulldepth reclamation fdr with cement for a quality stabilized pavement base. Introduction to the fulldepth reclamation pulverization. Eb 15025 page 1 of 18 geotechnical engineering manual. Addition of aggregate addition of stabilizers liquid asphalt portland cement.
Fdr removes pavement crack patterns and eliminates reflective cracking. Full depth reclamation with cement saves money while preserving natural resources by using existing materials and conserving virgin aggregates. Test results are used to perform simulations in mnpave software and a life cycle cost analysis. Although referred to as fulldepth reclamation, this process is just an extension of the basic cir principles to the entire pavement depth plus a predetermined depth of the material. Full depth reclamation recycling fdr this rehabilitation procedure entails pulverizing the old pavement structure, blending in a stabilizing agent, compacting, adding additional material, and resurfacing. Full depth reclamation fdr is an engineered rehabilitation technique in which the full thickness of the asphalt pavement and a predetermined portion of the underlying materials base, subbase andor subgrade is uniformly pulverized and blended to provide an. The old asphalt materials being used in the new mix never leave the site. Full depth reclamation is the pavement rehabilitation technique in which the full thickness of the asphalt pavement and a predetermined portion of the underlying materials base, subbase andor subgrade is uniformly pulverized and blended to provide an. Jointed, reinforced, crc, rcc, fulldepth reclamation, as well as bonded and unbonded overlays will be covered. The contents of a typical pavement design report will be described and an overview of nondestructive testing, traffic data, soils classification, overlay design and full depth reclamation fdr principles will be included. With fdr, road builders use trains of recycling equipment to pulverize, lift, grind, remix and repave asphalt in a single pass. Each student will receive the latest versions of txdot software and a set of class notes with example problems.
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