Known as ultra thin whitetopping utw, this experimental repair procedure involves placing a layer 50 to 75 mm 2 to 3 in. Its a relatively new rehabilitation technology for deteriorated hma. The construction and performance of this utw project have. Pcc thin overlay, commonly known as ultra thin whitetopping utw. Bonded whitetopping uses thicknesses of 5 to 15cm 26 bonded to the asphalt pavement and is divided into two types, thin and ultrathin. Ultrathin whitetopping utw is generally a thin overlay with a thickness. Chapter four design thin and ultrathin whitetopping the. Pdf whitetopping overlay is a relatively new rehabilitation technology as an alternative to hot mixed asphalt hma overlay. Evaluating the performance of whitetopping overlays in. Slab dimensions are usually less than those typically used in a newconstruction concrete pavement and so are more resistant to stresses.
Julie vandenbossche, manik barman, feng mu, kerri gatti 9. Bonding between overlay and underlying bituminous layer is mandatory. Ultra thin whitetopping pavements utw, also known as bonded concrete overlays of asphalt bcoa, consist of a 3 to 6 inch concrete inlay or overlay bonded to the surface of an existing asphalt or composite pavement structure harrington 2008. Utw can be used to rehabilitate and extend the service life of existing hma pavement structures which have failed from rutting, local surface distresses, fatigue cracking, and lowtemperature cracking. Sep 29, 2016 ultra thin whitetopping ppt free download as powerpoint presentation. Figure 2 ultra thin whitetopping technology continues to expand as the number of projects in the u. Construction constructing utw overlays proper construction of ultrathin whitetopping consists of four fundamental steps. Field performance evaluation of ultra thin whitetopping overlay in louisiana design, analysis, and asphalt material characterization for road and airfield pavements july 2014 design, construction, and performance monitoring of ultra thin whitetopping at a general aviation airport. Ultra thin white topping is a cement concrete overlay of thickness ranging between 50 mm and 100 mm over the bituminous pavement with surface failures gaining popularity in improving the longterm performance of the pavement. To do economic analysis to compare and suggest suitable type of overlay. There have been several utw projects completed in canada, the first in mississauga on, with others in brampton, markham, ottawa, hamilton, and. Synthesis of current minnesota practices of thin and ultra. The concrete overlay utilizes closely spaced transverse and longitudinal joints to reduce.
Thin white topping utwt which has pcc overlay of less than 100 mm. From 1990 to 1996 more than 800 projects representing 1 million sqm have placed in. Place, finish, texture, and cure using conventional techniques and materials. To design the ultra thin white topping with fibers so as study the effect of fibers on strength. Introduced in the united states in the early 1990s, utw has become an accepted and highly used method of road construction.
In general, the thin white topping is the designed with consideration of establishing a reasonable bond between the pcc and the underlying hma layer. Twt is typically constructed at intersections where rutting and shoving in asphalt pavement continue to cause problems. Ultra thin whitetopping is the technology to construct thin 50100mm portland cement concrete overlays on distressed asphalt pavements. In addition to the thickness of the concrete overlay, other factors differentiate utw from conventional concrete overlays are. Pdf on apr 15, 2015, mangesh hedau published ultra thin white topping find, read and cite all the research you need on researchgate. The use of whitetopping, as it is known, has been recorded as far back as 1918 although it was not until the 1970s that it became a more popular rehabilitation technique in the us.
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. Ultra thin whitetopping is an emerging and innovative technology for asphalt pavement rehabilitation in india. Prior to ultra thin whitetopping overlay placement, isolation joints shall be created by installing a minimum 14 inch 6 mm thickness of preformed filler, at all existing structures such as manholes, inlets, curbs, walls and buildings that will abut or otherwise interface with the new ultra thin whitetopping concrete overlay. Ultra thin whitetopping is one of the types of whitetopping in which a thin layer of concrete varying from 50 to 1 00mm thick with fibers is placed over a prepared surface of distressed asphalt pavement. Portland cement concrete pcc overlay on an existing bituminous pavement is commonly known as white topping. Evaluation ofunbonded ultrathin whitetopping of brick streets august 2002 6. Performance evaluation of ultrathin whitetopping in india. To ensure this, the existing layer of bitumen is milled to a depth of 30. Pdf performance evaluation of whitetopping and ultrathin. 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.
Performance evaluation of ultrathin whitetopping in india by. 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. Introduced in the united states in the early 1990s, utw has become an accepted and highly used method of road construction and rehabilitation. Pdf ultra thin white topping international journal. Ultrathin whitetopping utw is a concrete overlay of a distressed asphalt pavement, 50 to 100 mm thick, with close joint spacing. Prior to ultra thin whitetopping overlay placement, isolation joints shall be created by installing a minimum 14 inch 6 mm thickness of preformed filler, at all existing structures such as manholes. Best practices for the design and repair of thin and ultra thin whitetopping based on mnroad findings julie vandenbossche, university of pittsburgh, pittsburgh, pa forensic investigation of ultra thin whitetopping test sections at the mnroad project tom burnham, minnesota department of transportation, maplewood, mn break 10. Thin whitetopping uses a bonded layer of concrete that is 10 15cm 46 thick while an ultrathin layer is 5 to 10 cm 24 thick. Mar 23, 2016 trbs national cooperative highway research program nchrp synthesis 338.
Simply spread over the existing asphalt pavements in relatively. Nchrp synthesis 338 thin and ultrathin whitetopping. Thin white toppings twt, as originally developed in the usa in 1918 as a quick, costeffective and longlasting rehabilitation solution are, in majority, placed as an overlay on deteriorated asphalt pavements. To design and analysis of ultra thin white topping layer on ansys software.
Development of improved guidelines and designs for thin. Ultra thin whitetopping is the newest innovation in asphalt pavement rehabilitation. The research focuses on developing precast ultrathin whitetopping putw pavement for singapore. This final report documents the planning, construction, and performance of unbonded ultrathin whitetopping rehabilitation of a brick street in oskaloosa, iowa, in 2001. Based on the types of interface, there are 3 types in white topping namely, ultra thin white topping, thin white topping, conventional white topping.
Prepare the asphalt surface by milling and cleaning, or water or abrasive blasting. Pdf ultra thin white topping international journal ijritcc. In conventional whitetopping, this layer is placed in rectangular slabs of 4 inches or more in thickness. While whitetopping overlays have been constructed since 1918, design guidelines for this rehabilitative technique have not been available until recently. Extending asphalt pavement life using thin whitetopping core. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Utwt overlays are bonded to existing asphalt to create a composite section, resulting in improved performance and durability at a lower cost. References thin and ultrathin whitetopping the national. Nineteen cracks were found during the 3month survey in a right turn lane where the concrete overlay was less than the 3inch minimum. Ultra thin whitetopping is a bonded, fibre reinforced concrete overlay with closely spaced joints. This report summarizes the verification and revision of a thin whitetopping pavement mechanistic. Trbs national cooperative highway research program nchrp synthesis 338. Ultrathin whitetopping utw is a concrete overlay 2 to 4 inches thick, with closely spaced joints, bonded to. From 1990 to 1996 more than 800 projects representing 1 million sqm have placed in north america.
Research paper white topping as a rehabilitation method. One might conclude that thick whitetopping applies for a thickness greater than 7 inches. Pcc overlays, including thin and ultrathin bcoa, and its third edition is from 2014 3. 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. Feb 01, 1997 ultrathin whitetopping utw is a concrete overlay 2 to 4 inches thick, with closely spaced joints, bonded to an existing asphalt pavement. Pcc thin overlay, commonly known as ultrathin whitetopping utw. In 1994, the portland cement association sponsored research to develop a procedure for the design of ultra thin whitetopping pavement. Thin and ultrathin whitetopping the national academies press. Development of design guide for thin and ultrathin concrete. The original ultra thin project began in july 1994 and ended on july 1, 1999.
Appendix b detailed case studies thin and ultrathin. Development of design guide for thin and ultrathin. Ultra thin whitetopping utw, thin whitetopping twt and conventional whitetopping cwt are portland cement concrete pcc resurfacing techniques for asphalt pavement rehabilitation. Pdf precast ultrathin whitetopping putw in singapore. Pepper, a application of fiber reinforced concrete for thin and ultra thin white topping on i20 in mississippi,a presented at the 78th annual meeting of the transportation research board, washington, d. Ultra thin whitetopping city of edmonton the challenge 170 street at 118 avenue in the city of edmonton is subject to very heavy truck traf. In 1991, the first ultra thin whitetopping project in the. According to the author, utwt is a fasttrack process and it has been adopted by some countries.
Mnroad studies field performance of whitetopping design methods for the past 15 years whitetopping has been increasing in. Pdf precast ultrathin whitetopping putw in singapore and. Development of a design guide for ultra thin whitetopping. Extended road closure for rigid pavement reconstruction at heavy traffic road in singapore leads to a significantly high user delay cost. The ultrathin white topping utwt is one of best solution for the rehabilitation of the roads. Forensic investigation of ultrathin whitetopping pavements in. Ultrathin whitetopping for general aviation airports in new. Utw a solution for rutting asphalt while utw has been used for a variety of applications, it is used primarily where rutting is a recurring problem in the existing asphalt.
Mar 20, 20 ultrathin whitetopping utw is a technology to construct 50100mm thick cement concrete overlay on distressed asphalt pavement as a rehabilitation technique. Conference on best practices for ultrathin and thin. A study on concrete mix with quaternary blended sustainable. A more stringent grade must be maintained during milling operations to help in obtaining the minimum overlay thickness. Conference on best practices for ultrathin and thin whitetoppings. Ultrathin whitetopping for general aviation airports in. Whitetopping and ultra thin whitetopping are the concrete overlays placed on.
Since 1986, we have proudly served all branches of the military and civilian uniformed services army, navy, air force, marine corps, coast guard, national guard, public health service, noaa, civil air patrol and more. Ultra thin whitetopping utw is the term applied for a pcc overlay thickness between 2 and 4 inches. Thin whitetopping the colorado experience federal highway. Some define thin whitetopping overlays for a pcc thickness between 4 and 7 inches. Mnroad studies field performance of whitetopping design methods for the past 15 years whitetopping has been increasing in popularity in the u. It also reports on a similar project in des moines that was constructed two years later in 2003. 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.
Ultrathin whitetopping utwconcrete surface thickness ranging from 50 to 100 mm 2 to 4. Utw differs from conventional whitetopping because of the design and construction. 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. 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. Utw is a construction technique, which involves placement of a thinner than normal thickness ranging from 2 to 4 inches. Ultra thin whitetopping utw is generally a thin overlay with a thickness between 2 and 4 inches. Development of a design guide for ultra thin whitetopping utw. Austin, texas topic panel ahmad ardani, colorado department of transportation james grove, iowa state university wouter gulden, american concrete pavement association. Rigid pavement, bonded concrete overlay on asphalt, thin whitetopping. Ultrathin whitetopping for general aviation airports in new mexico. Ultra thin white topping has emerged as a competitive remedy for rutted asphalt pavement rehabilitation by offering the enhanced performance and durability of concrete. 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.
This produces a bonded composite pavement, with minimized. Utw is usually of high strength and made with fibers for improved tensile strength, ductility and enhanced fatigue life. This utw has been practiced since from the 1918 in usa. 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. Ultra thin whitetopping using concrete over asphalt is not a new technique. Ultrathin whitetopping concrete construction magazine. There is also a need for an applicable pavement for an electrified roadway, which allows charging of electric vehicles wirelessly while they are in operation. This project involves the continuation of the study of a 7. The term, ultrathin whitetopping or utw, refers to the process of resurfacing existing asphalt pavements with concrete overlays with a maximum thickness of 4 in. The use of supplementary cementitious materials scms in cement concrete pavements and. These include projects in minnesota, colorado, iowa, tennessee, georgia, missouri, and virginia. Ultra thin 2in to 4in ultra thin whitetopping is a bonded, fibre reinforced concrete overlay with closely spaced joints.
This technology involves bonding a thin concrete layer, 50 to 100 mm thick, to an existing prepared surface of asphalt pavement. Ultra thin whitetopping utw is a concrete pavement overlay alternative to hot mix asphalt hma overlay. Whitetopping overlay is a concrete overlay on the prepared existing hot mix asphalt hma pavement to improve both the structural and functional capability. Ultra thin whitetopping utw is a technology to construct 50100 mm thick cement concrete overlay on distressed asphalt pavement as a rehabilitation technique. Findings indicate that the performance of a thin whitetopping section depends to a large extent upon support conditions.
The following sections outline project details of sites from each of these states. Four design methods are included, namely the colorado department of. Thin and ultrathin whitetopping a synthesis of highway practice consultants robert otto rasmussen and dan k. Variations called thin whitetopping and ultra thin whitetop. Whitetopping refers to the use of a concrete overlay to resurface a distressed asphalt. Ultrathin ribbons and medals is home of the original custom thin ribbon set.
257 1403 733 1102 1797 1193 664 581 810 695 825 845 126 1461 397 1187 662 367 1482 1613 486 1660 1259