Minnesota department of transportation 1400 gervais ave. However, with respect to pavement rehabilitation, agencies many a times consider bituminous overlays as the. The concrete overlay utilizes closely spaced transverse and longitudinal jointsto reduce tensile stresses caused by traffic loads and environmental conditions such as thermal stresses and curling due to temperature changes. Evaluation of unbonded ultrathin whitetopping of brick streets final report june 2006 principal investigator james k. For thickness up to 100 mm, it is designated as ultra thin white topping utwt and for thickness more than 100.
Thin thickness between 4in and 8in ultra thin 2in to 4in ultra thin whitetopping is a bonded, fibre reinforced concrete overlay with closely spaced joints. Irc sp 76 free download fundamentals of anatomy and physiology book download webe phoebe model, all sets proshow gold full version crack keygen site. Ultrathin whitetopping repair demonstration youtube. Summary thin and ultrathin whitetopping the national. From 1990 to 1996 more than 800 projects representing 1 million sqm have placed in. Performance evaluation of ultrathin whitetopping in india by. Clipping is a handy way to collect important slides you want to go back to later. The report covers all stages of the proper application of whitetopping. Thin and ultra thin whitetopping a synthesis of highway practice consultants robert otto rasmussen and dan k. Rigid pavement, bonded concrete overlay on asphalt, thin whitetopping. University of pittsburghdepartment of civil and environmental engineering.
Ultra thin white topping may be defined as a concrete cover with closely spaced joints and bonded to an existing. Based on the types of interface, there are 3 types in white topping namely, ultra thin white topping, thin white topping, conventional white topping. Synthesis of current minnesota practices of thin and ultra. Ultrathin whitetopping for general aviation airports in. Read guidelines for conventional and thin whitetopping irc. Bonded whitetopping uses thicknesses of two to six inches bonded to the asphalt pavement and is divided into two types, thin and ultrathin.
Ultra thin white topping is a type of overlaying where. Ultra thin white projects executed in the country and important design concepts are discussed which influence life of ultra thin white topping. Sometimes referred to as ultra thin whitetopping utw but now more correctly called bcoa, these designs began to gain momentum in the mid1990s as many states and local agencies tried them for the first time. Findings indicate that the performance of a thin whitetopping section depends to a large extent upon support conditions provided by the existing asphalt. The research of this paper focused on bond characteristics of overlaysubstrate interface in ultra thin white topping utw, aim at ultra thin concrete overlay on old concrete. Chapter 2 illustrates the field testing of a utw ramp constructed in 1994 in new jersey, using heavy weight deflectometer hwd. It has a thickness between 100 200mm which is generally preferred for city roads and medium traffic highways. Cable associate professor department of civil, construction, and environmental engineering, iowa state university. Ultra thin white topping to restrengthen infrastructural structures and pavements conference paper pdf available september 2006 with 192 reads how we measure reads. Thin and ultrathin whitetopping the national academies.
Development of improved guidelines and designs for thin. Ictr273a was conducted in cooperation with the illinois center for transportation. The white topping technology is very useful in such situation as it has great strength than asphalt overlay and many benefits compared to bituminous pavement. Thin and ultrathin whitetopping summarizes available information to document how state departments of transportation and others are currently using thin and ultrathin whitetopping overlays among various pavement rehabilitation alternatives. Conventional whitetopping conventional concrete overlay placed directly over an existing asphalt pavement has a long history of use, and the practice is well established. Four of the six were thin white topping projects placed on mainline pavements, and the remaining two were ultra thin whitetopping projects placed at intersections. Ultra thin whitetopping utw is the term applied for a pcc overlay thickness between 2 and 4 inches. Design and concrete material requirements for ultrathin. Ultrathin whitetopping utwconcrete surface thickness ranging from 50 to 100 mm 2 to 4.
Ultrathin whitetopping utw is a concrete pavement overlay alternative to hot. Ultra thin white topping reduces maintenance cost as the concrete overlay have long life when compared with bituminous overlay. Mar 21, 2012 ultra thin white topping the significant increase in the number of automobiles observed in the recent years has created a need not only for the construction of new highways but also for the maintenance and rehabilitation of existing highway networks. Mnroad studies field performance of whitetopping design methods for the past 15 years whitetopping has been increasing in. Special specification 7161 repair of ultrathin and thin. The ultrathin white topping utwt is one of best solution for the rehabilitation of the roads. Ultrathin whitetopping concrete construction magazine.
Compressive and shear stress have been considered in the structural analysis and experimental research. For thickness up to 100 mm, it is designated as ultra thin white topping utwt and for thickness more than 100 mm but up to 200 mm. Ultra thin whitetopping ppt free download as powerpoint presentation. The purpose of this synthesis is to summarize available information and to document how departments of transportation and other agencies and owners are currently using thin white topping twt and ultra thin whitetopping utw overlays among their various pavement rehabilitation alternatives. Successfully performing projects had an underlying asphalt layer thickness after milling of more than 3 inches, unless. The current practices of thin whitetopping twt in minnesota and its adjacent states have shown that twt has been used successfully and is an important alternative for rehabilitating hma pavements of mediumvolume roads. Design and execution of thin white topping road ssrgjournals. Pdf ultra thin white topping international journal. In addition to the thinness, utw differs from conventional whitetopping.
Development of design guide for thin and ultra thin concrete overlays of existing asphalt pavements, 5. According to the author, utwt is a fasttrack process and it has been adopted by some countries. Thin white topping twt depends upon the thickness of the plain cement concrete pcc overlay and degree to which it is bonded with the existing underneath bituminous layer. References thin and ultrathin whitetopping the national. Pavements, ultra thin white topping, maintenance, concrete introduction ultra thin white topping is a relatively new rehabilitation technology applying a 50 to 100 mm 2 to 4in thick concrete overlay on top of existing asphalt pavement. It consists of a fine layer of high durability, fibrereinforced concrete laid over a clean, milled surface of distressed bituminous concrete pavement, to. Nchrp synthesis 338 thin and ultrathin whitetopping.
Ultra thin white topping technical report pdf available april 2015. Performance, analysis and repair of ultra thin and thin whitetopping at mnroad a paper submitted to the transportation research board for publication and presentation at the 2002 transportation research board annual meeting submitted by julie m. Ultra thin cheese slices delicious in sandwiches and grilled cheese and perfect for topping your turkey burger or veggie burger, these slices let you eat a little lighter without losing any flavor. Twt is typically constructed at intersections where rutting and shoving in asphalt pavement continue to cause problems. Austin, texas topic panel ahmad ardani, colorado department of transportation james grove, iowa state university wouter gulden, american concrete pavement association kathleen hall, protech engineering. Now customize the name of a clipboard to store your clips. Successfully performing projects had an underlying asphalt layer thickness after milling of more than 3. There have been several utw projects completed in india, the first in pune, subsequently in new delhi, ghaziabad, mumbai, and. During the design phase upper management looked at a number of projects and this one was tagged for. Performance evaluation of ultrathin whitetopping in india. Julie vandenbossche, manik barman, feng mu, kerri gatti 9.
The increase in use of thin whitetopping tw and ultra thin whitetopping utw has amplified the need for a comprehensive design procedure. Some define thin whitetopping overlays for a pcc thickness between 4 and 7 inches. Pdf whitetopping overlay is a relatively new rehabilitation technology as an alternative to hot mixed asphalt hma overlay. Whether whitetopping is a good candidate for the rehabilitation of deteriorated hmac pavement. Findings indicate that the performance of a thin whitetopping. Four of the six were thin whitetopping projects placed on mainline pavements, and the remaining two were ultra thin whitetopping projects placed at intersections. Thin white topping is a type of overlaying which can be constructed with or without bond between the concrete and bitumen pavement.
Pdf performance evaluation of whitetopping and ultrathin. See nutrition information for total fat and saturated fat content. Ultrathin whitetopping utw is a concrete overlay of a distressed asphalt pavement, 50 to 100 mm thick, with close joint spacing. Development of design guide for thin and ultrathin. Ultra thin whitetopping utw is a technology to construct 50100mm thick cement concrete overlay on distressed asphalt pavement as a rehabilitation technique. Thin and ultra thin whitetopping summarizes available information to document how state departments of transportation and others are currently using thin and ultra thin whitetopping overlays among various pavement rehabilitation alternatives. There were twelve conventional, ultra thin and thin whitetopping overlay projects built in india from 2003 to 2011 but to date, there has been no. The gardening channel with james prigioni recommended for you. Ultrathin white topping utw is a technology to construct 50100mm thick cement concrete overlay on distressed asphalt pavement as a. Rutted asphalt is a prime candidate for utw, provided the asphalt does not have an underlying base failure. Traditionally, cement concrete has been perceived as a material for newpavement construction, in particular for streets with heavy axle loads. Ultrathin whitetopping is a relatively new rehabilitation technology applying a 50 to 100 mm 2 to 4in thick concrete overlay on top of existing asphalt pavement.
The only noticeable difference being noticeable is that joint spacings 2 to 6 ft. Design and concrete material requirements for ultra thin whitetopping illinois center for transportation june 2008 civil engineering studies illinois center for transportation series no. Whitetopping refers to the use of a concrete overlay to resurface a distressed asphalt. Pdf ultra thin white topping international journal ijritcc. Paper consists of subsistence of highway road and improvement in low cost and increasing the strength and vitality of the pavement. Development of a design guide for ultra thin whitetopping.
Scribd is the worlds largest social reading and publishing site. Ultra thin whitetopping utw is a concrete overlay 2 to 4 inches thick, with closely spaced joints, bonded to an existing asphalt pavement. Apr 21, 2012 thin whitetopping the major advantage of the thin whitetopping is its thinness in comparison with the conventional white topping because of composite layer action due to bonding with underlying pavement. The technique of whitetopping asphalt concrete pavements with a thin 102mm to 152mm thick or ultra thin 51mm to 102mm thick concrete overlay is becoming more common. Download a pdf of thin and ultrathin whitetopping by the national academies of sciences, engineering, and medicine for free.
The early performance of each pavement is documented in illinois department of transportation idot physical research report no. At present many metropolitan cities in the country, including mumbai, face the problem of addressing severe pavement distresses in the old flexible bituminous pavements after each monsoon, incurring huge expenditure. Unbonded whitetopping, also called conventional whitetopping, uses concrete thicknesses of eight inches or more that is not bonded to the asphalt. Concrete pavement overlay 1990 how to build a hinged hoophouse for a raised bed garden duration. Whitetopping an engineered economical longlasting solution. Mnroad studies field performance of whitetopping design methods for the past 15 years whitetopping has been increasing in popularity in the u.
Since the first experimental section of utw was installed in 1991 on an access road to a landfill in louisville, kentucky, more than 170 utw projects. Research paper white topping as a rehabilitation method. Trbs national cooperative highway research program nchrp synthesis 338. Ultrathin whitetopping for general aviation airports in new. The early performance of each pavement is documented in. One might conclude that thick whitetopping applies for a thickness greater than 7 inches. Ultra thin whitetopping utw is a technology to construct 50100 mm thick cement concrete overlay on distressed asphalt pavement as a rehabilitation technique. Properties of interface structure between ultrathin white. Research report fhwaict08016, a report of the findings of ihrr273a design and concrete material requirements for ultrathin whitetopping, illinois center for. To ensure this, the existing layer of bitumen is either milled to a depth of 25 mm or surface scrapped with a nonimpact scrapper or gently chiseled.
This utw has been practiced since from the 1918 in usa. Thin and ultrathin whitetopping a synthesis of highway practice consultants robert otto rasmussen and dan k. While whitetopping overlays have been constructed since 1918, design guidelines for this rehabilitative technique have not been available until recently. Ultra thin whitetopping is generally a thin layer of concrete pavement. The concrete industrys newest remedy for rutted asphalt pavements, utw combines current concrete bridge deck overlay bonding technology with early sawing of closely spaced contraction joints. Guidelines for conventional and thin whitetopping irc. Introduction whitetopping refers to the use of a concrete overlay to resurface a distressed asphalt pavement. Pcc overlays, including thin and ultrathin bcoa, and its third edition is from 2014 3. Pdf on apr 15, 2015, mangesh hedau and others published ultra thin white topping find, read and cite all the research you need on. Ultrathin white topping may be defined as a concrete cover with closely spaced joints and bonded to an existing bituminous pavement.
Ultra thin 2in to 4in ultra thin whitetopping is a bonded, fibre reinforced concrete overlay with closely spaced joints. The ultra thin white topping utwt is one of best solution for the rehabilitation of the roads. Four design methods are included, namely the colorado department of. Known as ultra thin whitetopping utw, this experimental repair procedure involves placing a layer 50 to 75 mm 2 to 3 in. Based on the types of interface provided and the thickness of overlay, classification is as follows4. Transportation idot with an ultrathin whitetopping utw thickness design method. Study on concrete mix design for ultra thin whitetopping. Ultra thin whitetopping is an emerging and innovative technology for asphalt pavement rehabilitation in india. Buy guidelines for conventional and thin whitetopping irc. In 1994, the portland cement association sponsored research to develop a procedure for the design of ultra thin whitetopping pavement. Introduced in the united states in the early 1990s, utw has become an accepted and highly used method of road construction and rehabilitation.
Ultrathin whitetopping repair demonstration federal highway administration 2001 video vh559 a clear, nononsense, stepbystep demonstration of the repair of ultra thin. The ultrathin whitetopping looks and acts like regular concrete pavement overlays. Evaluation of unbonded ultrathin whitetopping of brick streets. Journal of international academic research for multidisciplinary impact factor 1. Iowa ultra thin whitetopping at two years of age, hr559.
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