Full depth reclamation of asphalt pavements has been determined to be a more costeffective means to rehabilitate lowvolume roads, proportionally increasing service life when compared to full depth reconstruction. Guide to fulldepth reclamation fdr with cement by david r. Suggested construction specification for fulldepth. Fdr is an economical, inplace recycling alternative to road reconstruction. Key words asphalt pavement recycling fulldepth reclamation with cement pavement. In this process, the old asphalt roadway is pulverized, mixed with portland cement, and compacted to create a stabilized base. Stabilized pavement bases, such as soilcement and cementtreated bases, have provided economical, longlasting pavement foundations for nearly 70 years. Fulldepth reclamation uses the materials from the deteriorated asphalt pavement, and, with the addition of cement, creates a new stabilized base. Best practices for full depth reclamation asphaltpro. Fulldepth reclamation with cement 28th annual regional local roads conference david l. Cement slurry will bond the asphalt together with the existing subbase stone and subgrade soils.
May 02, 2017 guide to fulldepth reclamation fdr with cement by kristina mcinerny. This special provision covers the requirements for inplace full depth reclamation of the existing asphalt. Guide to fulldepth reclamation fulldepth reclamation. Apr 19, 2020 full depth reclamation fdr is a process that recycles asphalt and aggregate from failed roads, with cement and water to create a stable solid base for resurfacing with asphalt or concrete wearing surface. Best practices for full depth reclamation using asphalt emulsions background 5 mixture designs for fdr projects stabilized with emulsion are varied. A surface consisting of a thin bituminous chip seal, hotmix asphalt, or concrete completes the road. An fdr road can be completed with either an asphalt or concrete surface layer. Full depth reclamation and asphaltic concrete pavement howell ferry road from north berkeley lake road to peachtree industrial boulevard. With fdr, road builders use trains of recycling equipment to pulverize, lift, grind, remix and repave asphalt in a single pass.
Using full depth reclamation, roads that have cracked and deteriorated as a result of poor substructure are reconstructed and strengthened utilizin. Fdr conserves materials by reusing pavement components. Full depth reclamation fdr consists of pulverizing the asphaltwearing layer top of the road into the base material and evening the subbase material to depths of up to 300 mm. Matthew singel is the director of soil cement and roller compacted concrete pavement for the cement council of texas. His experience with cement stabilized bases and subgrades, full depth reclamation, rollercompacted concrete and asphalt have made him a. Fdr is a process when pavement and underlying materials are uniformly blended and processed to creat a stabilized base course with the addition of addrock, lime. To correct subgrade problems, the reclaimed material typically is moved. Save time, money, and the environment on your next asphalt paving project with full depth pavement reclamation.
Fulldepth reclamation a costeffective, durable option for roadways what was the need. Fulldepth reclamation a costeffective, durable option. Unlike cold inplace asphalt recycling, full depth reclamation utilizes the full depth of the pavement, aggregate base and, in some cases, the soil or subbase below. Corrective aggregate, if required, shall be added to the the mixture shall be roadway prior to stabilization. Fulldepth reclamation fdr rebuilds worn out asphalt pavements by recycling the existing roadway. Full depth reclamation with cement saves money while preserving natural resources by using existing materials and conserving virgin aggregates. Description full depth reclamation fdr is a pavement rehabilitation technique in which the existing asphalt pavement and a portion of the underlying granular base is pulverized. A very popular reconstruction alternative is known as fulldepth reclamation fdr.
Full depth reclamation using cement is a method of flexible pavement reconstruction that utilizes the existing asphalt, base, and subgrade. The stabilization process not only recycles the old wornout flexible pavement, but it also provides stability to the underlying soils, all with a single process. Fulldepth reclamation concrete construction magazine. Portland cement association 5420 old orchard road skokie, illinois 600771083. Fulldepth reclamation fdr with or without various stabilizers has been successfully used as a rehabilitation strategy in california since 2001.
This can act as an alternative to the replacement of the base which is susceptible to underground moisture. The full depth reclamation operations shall be completed through a minimum of two separate processing phases. Full depth reclamation distributes load pressures over a greater surface area, allowing for better bridging over the subgrade. Full depth reclamation fdr with cement is a procedure where failed asphalt pavements are pulverized and reclaimed. Guide to fulldepth reclamation fdr with cement institute for. Fulldepth reclamation fdr with cement slurry is a process of recycling an existing road inplace and chemically stabilizing it with cement slurry. Dont just take our word for it see what the many zipper owners think. Full depth reclamation additive selection guidelines inplace recycling conference salt lake city june 3, 08. Authors tom scullion, stephen sebesta, cindy estakhri, pat harris, changseon shon, omar harvey, and keisha roseharvey 8.
Adding portland cement during the full depth reclamation process creates a base that has greater resistance to low underground water tables or clay which often wreak havoc on roads and parking lots. Methods in use are marshall, superpave, wirtgen wirtgen 2004, proctor aashto t99, modified proctor kim and labuz 2007, and unconfined compressive strengths. This report assists the portland cement association pca and industry stakeholders in an evaluation of. Design of fulldepth reclamation with portland cement fdr. One technique with proven success is full depth reclamation fdr with cement. Suggested construction specification for fulldepth reclamation. Analysis of fulldepth reclamation trial sections in virginia brian k. A 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, resulting in a stabilized base course sbc. In summary, full depth reclamation converts a wornout asphalt pavement into a stabilized base course. Full depth reclamation with cement 28th annual regional local roads conference david l. Full depth reclamation fdr has been defined as a recycling method where all of the asphalt section and a predetermined amount of the underlying base and subgrade section are pulverized and treated to produce a stabilized base course.
Fulldepth reclamation fdr of asphalt pavement is often used on rural roadways to reduce costs for materials and hauling. Fdr typically uses from 35 to 60 pounds of cement per square yard 19 to 33 kilograms per square meter, depending on existing materials, depth of reclamation, and strength desired. 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. Please note that specific forms for submission of a bidproposal are required. This process involves rebuilding failed asphalt pavements by pulverizing the existing surface and base, and blending the reclaimed aggregates with cement to create a new cement stabilized base, that is then given a new riding surface. Guide to fulldepth reclamation fdr with cement by kristina mcinerny. Report date july 2011 resubmitted may 2012 published.
This costef fective technique is popular with state, county and city highway agencies attempting to corr ect their. Fulldepth reclamation fdr with cement is a procedure where failed asphalt pavements are pulverized and reclaimed. Full depth reclamation fdr with cement slurry from sagamore ready mix is a dustfree process of recycling inplace wornout asphalt and turning it into new cement treated subbase. This is typically a soilcement or cementtreated base mix but includes asphalt.
The cement dust poses a nuisance and, when inhaled, a health threat. In todays environment, the practice of remove and replace has become impractical from the standpoint of cost and environmental impact. This is typically a soil cement or cement treated base mix but includes asphalt. Th e old asphalt and base materials are pulverized, mixed with cement and water, and compacted to produce a strong, durable base for either an asphalt or concrete surface. This means high traffic roads are better able maintain their structural integrity and hold strong for the long haul. The city of edmonton did however have several years experience with the use of cement as a stabilizer in full depth reclamation. Full depth reclamation also known as pulverizing is a road rehabilitation method in which the full thickness of the asphalt pavement and a portion of the underlying granular material is uniformly pulverized, mixed and reblended to create a uniform and consistent blend of road base material. Fdr reduces future maintenance costs by eliminating cracks, base failures and other distresses. Fdr removes pavement crack patterns and eliminates reflective cracking. Fulldepth reclamation using portland cement southeast cement. Further stabilization may be obtained through the use of available additives. Full depth reclamation pulverized flexible pavement section creating a uniform stabilized base further stabilization obtained through.
Full depth reclamation and mix and mill acplm 8 633. Guide to fulldepth reclamation fdr with cement cnca. The recycled base will be stronger, more uniform, and more moisture resistant than the original base. Full depth reclamationrecycling 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 with cement is a stabilizing pavement solution in which a deteriorated asphalt pavement and the underlying base materials are pulverized then mixed with cement and water to form a cement treated stabilized base course. Addition of aggregate addition of stabilizers liquid asphalt portland cement. Truck traffic is reduced, and there is little or no waste. Fulldepth reclamation fdr with cement is a stabilizing pavement solution in which a deteriorated asphalt pavement and the underlying base materials are pulverized then mixed with cement and water to form a cementtreated stabilized base course. The pavement performance is improved through better stabilization, building a stronger, lowmaintenance pavement that will last for many years. Fulldepth reclamation with cement is the property of its rightful owner. Cement modified soil full depth reclamation cement treated base pervious concrete lean concrete base. The zipper will revolutionize the way you work with asphalt.
Conventionally, fdr uses dry cement powder applied with a pneumatic spreader, creating undesirable fugitive cement dust. Learn how full depth reclamation restores the life of. 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. The first or pulverization phase shall consist of milling and mixing the asphalt concrete and base course materials to specified depths such that 100% of the pulverized material is smaller than 40 mm and a minimum 95% is smaller than 25 mm. The full depth reclamation process also conserves natural resources by recycling existing materials. 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. Adding portland cement is often a better option than replacing the base that is prone to moisture accumulating below ground. A comprehensive guide to full depth reclamation fdr using cement.
Fdr promotes the reuse of existing road materials and significantly reduces the use of fossil fuels and virgin resources such as aggregate and asphalt. Sustainable engineering technologies in pavement rehabilitation, such as full depth reclamation fdr, could be the answer for agencies in their quest to. 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. If so, share your ppt presentation slides online with. A traditional reconstruction can also take months, he said. Guide to fulldepth reclamation fdr with cement the guide provides a concise discussion of all aspects of selecting, designing, and constructing a reclaimed, cement stabilized asphalt base in preparation for a new pavement surface layers. Fulldepth reclamation with cement concrete construction.
The old asphalt and base materials are pulverized, mixed with cement and water, and compacted to produce a strong, durable base for either an asphalt or concrete surface. Fulldepth reclamation of asphalt pavement is a rehabilitation method that involves recycling an. Comparison of fulldepth reclamation with portland cement. Consequently, fdr in conjunction with conventional cement. We know weve got the best machines at affordable prices. Full depth reclamation is a process whose time has come its environmentally sound, gives enhanced performance, and saves dollars. The presentation covers the design and construction steps of the entire process, as. Then there is a second pass where liquid asphalt and sometimes cement is incorporated. Duluth project full depth reclamation and asphaltic concrete.
A procedure is available, called fulldepth reclamation with portland cement fdr pc, which allows these failed asphalt pavements to be recycled and stabilized, creating a new base that will provide an excellent foundation for longterm pavement performance. Full depth reclamation with cement opportunity assessment. Cement council of texas matthew singel cement council of. The stabilized pavement layer becomes the base or subbase for the rebuilt pavement structur e. The fdr process begins with using a road reclaimer to pulverize an existing asphalt pavement and a portion of the underlying base, subbase, andor subgrade. Analysis of fulldepth reclamation trial sections in virginia. Fulldepth reclamation a costeffective, durable option for. Portland cement is commonly used in full depth reclamation projects.
Also known as asphalt pulverization, full depth 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. One technique with proven success is fulldepth reclamation fdr with cement. This is an indepth, informative look at how convenient, cost effective, and efficient fdr processes are. Full depth reclamation a costeffective, durable option for roadways what was the need. Full depth reclamation additive selection guidelines. Portland cement forms a base that is better protected against low underground water tables that damage.
Many engineers and public works officials are turning to a process called fulldepth reclamation fdr with cement for a. Search our library to find someone near you or to find a project like yours. The completed reclaimed pavement can be covered with a bituminous surfacing rock chips and liquid asphalt emulsion. Factors affecting the strength of road base stabilized with. Best practices for fulldepth reclamation using asphalt emulsions. Instructions for preparation and submission of a bid or proposal are contained in this invitation for bidproposal package. The fulldepth reclamation process uses the old asphalt and base material for the new road. Fulldepth reclamation of asphalt pavements with cement. Full depth reclamation and stabilized full depth reclamation. The different mixing methods include blade, flat type, windrow type and hopper type figure 162. Full depth reclamation fdr is the process of pulverizing and blending all layers of an asphalt pavement insitu, as well as part or all of the underlying base materials to provide a homogenous material upon which to place a surface course.
Sustainable engineering technologies in pavement rehabilitation, such as fulldepth reclamation fdr, could be the answer for agencies in their quest to. Emulsified asphalts, fillers, virgin aggregates or recycled asphalt pavements rap can be added to maximize the effectiveness of the system. Full depth reclamation fdr in conjunction with cement stabilization is an established practice for rehabilitating deteriorating asphalt roads. Although not a preservation strategy, full depth reclamation fdr is a proven alternative to traditional reconstruction. Soil and stabilization equipment used for full depth reclamation. Full depth reclamation with portland cement fdrpc method. Associations guide to fulldepth reclamation fdr with.
Research scientist virginia center for transportation innovation and research a partnership of the virginia department of transportation and the university of virginia since 1948. Identify areas of excessive surface deformation, which may indicate soft subgrade conditions or drainage deficiencies. Full depth reclamation federal highway administration. 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. Fdr has been growing in popularity over the past eight to 10 years, said product application specialist anthony low at caterpillar, peoria, illinois.
Full depth reclamation fdr of asphalt pavement is often used on rural roadways to reduce costs for materials and hauling. Full depth reclamation with portland cement fdrpc method specification 2018 prepulverize the roadway prior to stabilization, the depth of the preization shall be 50 mm less thanpulver the depth of stabilization. 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 upgraded, homogeneous material. Route county fdr depth stabilizing additive ac overlay thickness sr3 richmond 9. Opss 331, november 2003, construction specification for full depth reclamation with expanded asphalt stabilization, is deleted in its entirety and replaced with the following. Advantages of fulldepth pavement reclamation asphalt. As a result, the city of edmonton had a specification for full depth reclamation utilizing cement and used this specification as. Fulldepth reclamation of asphalt pavement is a rehabilitation method that involves recycling an existing asphalt pavement and its underlying layers into a new base layer. Fulldepth reclamation fdr with cement is a procedure where failed asphalt pavements are pulverized and reclaimed, using cement to stabilize the recycled. Full depth reclamation project issues kimbel stokes, general manager the miller group, inc.
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