A workshop on perpetual pavements was held in october 2000 in cincinnati. Key words perpetual pavement, hma pavement, strain gage instrumentation. This report highlights the perpetual pavements designed by state highway. New asphalt pavements research, and longlife perpetual asphalt john harvey university of california pavement research center davis and berkeley calapa 16 april 2015 ontario, ca 2. Longlife asphalt pavement perpetual pavement a joint caltransconstruction industryuniveristy of california effort. Goal of perpetual pavement design design so there are no deep structural distresses bottom up fatigue cracking structural rutting all distresses can be quickly remedied from surface result in a structure with perpetual or long life. Perpetual pavement design and construction using antifatigue base layer on. Tailored for specific application consistent, smooth and safe driving surface. Apa 101 5 aperpetual pavement is defined as an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in response to distresses confined to the top of the pavement. Perpetual pavements an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in response to distresses confined to the top of the pavement apa, 2002. Canadian case study for perpetual pavements design s. Pdf perpetual pavement a boon for the indian roads. Program nchrp 934 who investigated whether combining a fieldvalidated simple.
Tighe, phd, peng professor and canada research chair in pavement and infrastructure management department of civil and environmental engineering, university of waterloo, canada m. Perpetual pavement is a flexible but strong asphalt pavement that doesnt exhibit structural damage even when very high traffic flows over long periods of time. No need to include both in the title very general should explain more what was done does not mention the comparison. New research into asphalt pavements, and longlife perpetual asphalt 1.
Perpetual pavement is the name coined to describe a threelayer, flexible pavement design and construction concept. Routine maintenance is simply a matter of periodically milling about every 12 to 20 years the surface for recycling, followed by placement of a new, smooth overlay. This synthesis begins with a discussion of perpetual pavement design for both new and rehabilitation designs. About perpetual pavements the perpetual pavement concept was first articulated in 2000 and the concept has rapidly gained acceptance. In 2003, the california department of transportation caltrans, the asphalt pavement industry and the university of california pavement research center ucprc launched a collaborative effort to test longlife pavement strategies on a rehabilitation project on the 710. The bottom layer is designed to be strong but flexible to resist strains that could cause cracks to form from the bottom up. The concept of perpetual pavements, or longlasting asphalt. Perpetual pavement with rubblization rubblize 11 pcc overlay with 8 hma initial cost. Longlife asphalt pavement perpetual pavement calapa. Only asphalt can be the perpetual pavement, and perpetual pavement is the only one that lasts indefinitely. Perpetual pavements pp concept, attempted successfully in europe and usa during last decade, is aimed to build more costeffective superior pavements with enhanced design life by restricting all distresses to pavement surface only. Evaluation of longlasting perpetual asphalt pavement. Distresses will initiate at the surface, typically in the form of rutting or cracking.
Evaluation of a hot mix asphalt perpetual pavement wisconsin dot. Perpetual pavement design construction considerations layer considerations renewable surface. Design and construction standards pavement markings. Perpetual pavement uses an advanced design process that lays asphalt in multiple layers to increase durability, strength, and longevity in roads and highways. Perpetual pavement perpetual pavement combines the welldocumented smoothness and safety advantages of asphalt with an advanced, multilayer paving design process, that with routine maintenance, extends the useful life of a roadway. Perpetual asphalt pavements asphalt pavement alliance. If properly maintained and rehabilitated, a perpetual pavement can be designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction. The renewable surface lift will need periodic 814 years replacement. Environmentally friendly avoids costly reconstruction. A perpetual pavement is defined as an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in.
Perpetual pavements the truth about asphalt pavement. Data, on pavement infrastructure and performance, are not available to enable faster pavement improvements and innovations. Title evaluation of longlasting perpetual asphalt pavement using life cycle cost analysis longlasting and perpetual are synonyms. The perpetual pavement concept has been utilized throughout the us. Perpetual pavements washington asphalt pavement association. Combining the increased quantity of bitumen with an appropriate total. The required thickness of a perpetual pavement varies from 10 to 15 in. The concept of perpetual pavements, or longlasting hma pavements, is. Perpetual pavement concept asphalt pavements with high enough strength will not exhibit structural failures. Pavements designed and constructed in accordance with the perpetual pavement concept will last, and last, and last. Pfcs are highly recommended in locations where overall traffic volume is high and average rainfall is at least 25inches per year. The hot mix asphalt hma design begins with a strong, yet flexible bottom layer that resists tensile strain caused by traffic, and thus stops cracks from forming in the bottom of the pavement. Perpetual pavement design construction considerations.
Indefinite fatigue life renewable pavement surface. Perpetual pavement missouri asphalt pavement association. Perpetual pavement, layer thickness, modulus, design, lcca, subgrade. The perpetual pavement concept advances the notion that deep, structural pavement distresses that destroy pavement life could be altogether avoided if distresses were kept below the design threshold for strains, stresses, and deflections. A synthesis, 2010, trl 250, design of longlife flexible pavements, nunn et al. However, it is a type of asphalt that combines all the smoothness and safety of asphalt, but in multiple layers. It is from such need that the concept of perpetual pavements arises and it becomes the. Marvin traylor, illinois asphalt pavement association for use of slides and information trb circular 503, perpetual bituminous pavements, 2001 perpetual asphalt pavements. For example, in oklahoma city, two sections of interstate 40 were built with this design in 1967, long before the perpetual pavement. The perpetual pavement gives engineers the ability to design for specific modes of distress. Perpetual pavement is a term used to describe a longlasting structural design, construction and maintenance concept for hma pavements. Special considerations for the construction of perpetual pavements 4.
In short, avoiding damage at the bottom or base of pavements and keeping wear at the surface level creates. An asphalt perpetual pavement is designed and built to ensure that the structure lasts virtually indefinitely. Section 4 flexible pavement construction standard specification for urban infrastructure works 48 edition 1, revision 02 oct 2010 test method description base material requirements dgb20 gmb20 ngb202c 2d as 1289. Resistance to bottomup fatigue cracking is provided by the lowest asphalt layer, which has a higher binder content, or by the total thickness of pavement reducing tensile strains in the base layer to an insignificant level. About perpetual pavements asphalt pavement alliance. The vast highways network in china is moving from the phase of construction to the phase of maintenance, and with the introduction of new technique of perpetual pavement in last decade, it is necessary to consider recycling as one of the promising solutions for rehabilitation of old asphalt concrete pavement and ultimately to convert them into perpetual pavements. The concept of a perpetual pavement is to design fatigue and rutresistant lower hma layers, thereby limiting any distresses to topdown cracking in the relatively thin, highquality surface hma layer.
By definition, a perpetual pavement is a longlasting thick hma pavement structure with a service life in excess of 50 years without major structural rehabilitation andor reconstruction activities in particular the intermediate and bottom layers. Perpetual pavement is an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in response to distresses confined to the top of the pavement. Specific layer purposes and distresses are provided. This comprehensive publication captures the activities that have taken place over the last decade, synthesizes the information in way that is useful to providing. Perpetual pavements are not just for highway projects many municipal pavements can also be designed as perpetual pavements increasing the thickness of the hot mix layers by 25 to 35 percent will likely result in a perpetual pavement there are tools to allow municipalities to look at perpetual pavement options perroad v3. Recommendations are given for future research in order to obtain an optimum asphalt perpetual pavement design. A perpetual pavement is defined as an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in response to distresses confined to the top of the pavement. Perpetual pavements use multiple layers of durable asphalt to produce a safe, smooth, longlasting road.
This is followed by a summary of material characteristics to be considered in design and performance. Perpetual pavements apam, asphalt pavement association of. Evaluating life cycle costs of perpetual pavements in. Pavement preservation techniques are not well understood within the transportation industry and stateoftheart standards are nonexistent. Elhakim, masc phd student, department of civil and environmental engineering, university of waterloo, canada. Roadway infrastructure sc asphalt pavement association. The perpetual pavement pp is defined by asphalt pavement alliance apa 2002 as an asphalt pavement designed and built to last longer than 50 years without requiring major structural rehabilitation or reconstruction, and needing only periodic surface renewal in response to distresses confined to the top of the pavement. A perpetual pavement system consists of three hma pavement layers, a base course layer, and subgrade. Rubblization and perpetual pavement save money and. Application of the concept produces a deepstrength asphalt pavement that can resist structural fatigue distress for a long time at least 50 years and, thus, results in.
472 927 1200 1309 948 604 913 1165 1087 1178 301 982 124 1088 850 1257 298 630 961 267 291 1053 921 251 271 1402 1405 387 388 1163 944 514 894 750 807 1182 964 221 540 359 1485 208 1101 788 1092 57 1296