Prior to ultrathin 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 ultrathin whitetopping concrete overlay. Construction typical concrete finishing and texturing procedures are appropriate for ultrathin whitetopping. Synthetic fibers provide equal or better performance than steel fibers, which are expensive, heavy and difficult to mix. The first whitetopping project occurred in 1918 in. Existing pavement condition expected traffic layer and material properties interface condition slab geometry climatic conditions sc initial sc overlay sc effective sc future traffic load applications. Until 1999, concrete whitetopping had not been used on any michigan trunklines. Trbs national cooperative highway research program nchrp synthesis 338. Payment includes all materials and labor to mill and clean the existing pavement, place, finish, cure and saw joints in the whitetopping. Concrete properties the concrete mix for a particular whitetopping project is often selected based on the requirements for opening to traffic. Development of a design guide for ultra thin whitetopping.
Iowa ultra thin whitetopping at two years of age, hr559. Select pdf files from your computer or drag them to the drop area. This document provides the mechanical procedures of constructing road plain. Development of design guide for thin and ultrathin concrete overlays of existing asphalt pavements, 5. Whitetopping refers to the placement of a thin concrete overlay directly on top of an existing distressed hotmix asphalt hma pavement. Wyoming whitetopping brochure download file size 1.
Whitetopping is the covering of an existing asphalt pavement with a layer of portland cement concrete. Chapter 2 illustrates the field testing of a utw ramp constructed in 1994 in new jersey, using heavy weight deflectometer hwd. Click, drag, and drop to reorder files or press delete to remove any content you dont want. This research is intended to evaluate the effect of four primary variables on long term performances of the pcc concrete overlay, commonly called whitetopping. This work is to present a bibliographical study of the characteristics of the use of a concrete whitetopping coat of portland cement used in. Whitetopping concrete overlay offers costeffective alternative to asphalt overlay essed and ed ount opping can be ed. Concrete parking comprehensive concrete parking and.
Aadditives give concrete whitetopping strengthdditives give concrete whitetopping strength. Study on concrete mix design for ultra thin whitetopping satish d assistant professor, department of civil engineering new horizon college of engineering, bengaluru 560103,karnatka, india abstract ultrathin whitetopping utw is an overlay for pavement rehabilitation option to asphalt concrete overlays. Ultrathin whitetopping utw is a technology to construct 50100mm thick cement concrete overlay on distressed asphalt pavement as a rehabilitation technique. There have been several utw projects completed in india, the first in pune, subsequently in new delhi, ghaziabad, mumbai, and. Owners can transform a rutted asphalt surface into an attractive, functional parking area by covering it with a concrete overlay, or whitetopping.
A 1,676 m 5,500 ft section of county road r16 in dallas county, iowa was divided into 12 test sections. The term concrete refers to a mixture of aggregates, usually sand. Study on concrete mix design for ultra thin whitetopping. Rehabilitating existing pavement with concrete options. You can merge pdfs or a mix of pdf documents and other files. Introduction to concrete portland cement association. For longterm performance, the overlay must bond to the underlying. Whitetopping is a rehabilitation alternative for flexible pavements, which overlays an existing flexible hot mix asphalt hma pavement with portland cement concrete pcc. The gomaco gp2400s singlelane paving passes were 12.
And blast furnace slag is in the mix every step of the way. Mndots fiber reinforced concrete roundabout and joint. The concrete whitetopping pavement presents a new technology, simple and with benefits in your use, showing itself as an innovative method practiced for many years, but still not very widespread in brazil. Whitetopping transforms rundown asphalt into durable, lowmaintenance pavement that will last for decades.
University of illinois urbanachampaign 25 june 2015 iscp concrete pavement seminar idot district 1. How to merge pdfs and combine pdf files adobe acrobat dc. Whitetopping construction and early performance in illinois. A mechanistic design procedure was developed for the state of colorado to determine the required concrete thickness of thin 12. Ultra thin whitetopping ppt free download as powerpoint presentation. Whitetopping overlay two types of whitetopping overlays are available. Aadditives give concrete whitetopping strengthdditives. Proper curing is critical to avoiding shrinkage cracking in the concrete overlay and to prevent debonding between the asphalt and concrete. Existing hotmix asphalt pavement square slabs, typically 1. For rapid strength gain under fasttrack conditions, a common requirement in urban areas, concrete mix designs sometimes include higher cement contents 39. Whitetopping is the term used for paving with portland cement concrete pcc over an existing bituminous pavement 1. Parking lot task force downloadable resources item 1 foundation support item 2 main talking points financial sustainability item 3 communication plan item 4 technical support item 5 responsibilities 1. About four tons of concrete are produced per person per year worldwide and about 1.
Whitetopping is a rehabilitation alternative for flexible pavements, which overlays an existing flexible hot mix asphalt hma pavement with portland cement concrete pcc surface. A concrete overlay ranging between 50 and 100 mm 2 and 4 in. How to recover deleted, unsaved or corrupted pdf file. Asphalt wears out quickly and when it does, asphalt overlays and sealcoats are only a temporary fix. Concrete overlays are better suited for normal wear and tear from vehicles. Compress pdf files for publishing on web pages, sharing in social networks or sending by email. In particular, several studies on the use of ultrathin whitetopping utw, a very thin 2 to 4 in.
Rather than resort to timeconsuming and costly total reconstruction, a concrete overlay was constructed on outer drive in 2000 to. Whitetopping is paid for by the cubic yard meter inplace and accepted. Cg060414 d32 cg120807 d15 hw0814 d12 hw103 d8 hw1045 d6 w272up1 whitetopping depths of. The deformation across the tensile cracks was measured and used as. The file format was standardized by the international organization for standardization iso in 2008. 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. Standard overlays are 46 inches thick, but they can be as thin as 2 inches for lowvolume roads or as thick as 1720 inches for airport runways. Resurfacing asphalt pavements with concrete overlays, a process known as whitetopping, is another example of overlay research. Concrete pavement overlay design jeffery roesler, ph. Concrete is more rigid than asphalt which makes concrete roads 4% more fuel ef. Key words whitetopping, bonded concrete overlay, unbonded concrete overlay 18. Click add files and select the files you want to include in your pdf. Whitetopping is divided into types depending on the thickness of the concrete layer and whether the layer is bonded to the asphalt substrate.
The variables are thickness 50 mm, 100 mm, 150 mm, and 200 mm, joint spacing 0. Julie vandenbossche, manik barman, feng mu, kerri gatti 9. Unlike other services this tool doesnt change the dpi, thus keeping your documents printable and zoomable. Known as ultrathin whitetopping utw, this experimental repair procedure involves placing a layer 50 to 75 mm 2 to 3 in. Unbonded whitetopping, also called conventional whitetopping, uses concrete thicknesses of eight. Thin whitetopping twt concrete surface thickness ranging from 100 to 150 mm 4 to 6 in.
Since the release of the first version of the pdf file format, adobe systems has released multiple new versions to add additional features for example, in 1996, version 1. The objectives of this research were to provide the illinois department of transportation idot with an ultrathin whitetopping utw thickness design method and guidelines for utw design, concrete material selection, and construction practices. Whitetopping consists of a concrete overlay, or inlay, placed on an existing hotmix asphalt hma surfaced pavement, as shown in figure 1. Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material. This research was initiated in 1991 as a part of a whitetopping project to study the effectiveness of various techniques to enhance bond strength between a new portland cement concrete pcc overlay and an existing asphalt cement concrete acc pavement surface. Pdf mechanistic design of thin whitetopping pavements in. Bond contribution to whitetopping performance on low.
One proven solution is a thin concrete overlay called whitetopping. A twopass concrete whitetopping was placed on state highway 24a near cozad, nebraska, usa. Asphalt wont work for a bridge abutment how to design. Pdf model development and interim design procedure.
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