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One such innovative pavement strengthening strategy is to provide Thin or Ultra-Thin white topping overlay. Ultra-Thin White topping is a rehabilitation technique in which a 50 to 100 mm thick layer of high strength, fiber-reinforced, cement concrete is place on a milled surface of rutted and/or cracked bituminous concrete pavement.

By "whitetopping" a deteriorated "blacktop" pavement, the owner can make the lot do what it should--provide clean, safe and convenient parking for customers and employees. Whitetopping is the application of a concrete overlay of suitable thickness (usually 3, 3 1/2 or 4 inches) to increase the load-carrying capacity of the pavement and provide ...

Ultra-thin white topping is a concrete pavement overlay option for distressed asphalt concrete pavements. A structural and material design procedure has been proposed based on literature and new research. The failure criteria for the UTW thickness is concrete …

Portland Cement Concrete (PCC) overlay on an existing bituminous pavement is commonly known as White topping. The principal purpose of an overlay is either to restore or to increase the load carrying capacity or both, of the existing pavement.

Ultra-Thin White Topping may be defined as a concrete cover with closely spaced joints and bonded to an existing bituminous pavement. It consists of a fine layer of high durability, fibre-reinforced concrete laid over a clean, milled surface of distressed bituminous concrete pavement, to achieve full …

Table 8. Ultra Thin White topping Overlay Pavement Layer Cost/km Leng th (m) Thick (mm) Width (m) Rate (Rs) Ultra-Thin White Topping (UTWT) 5,741,000 1000 100 10 5741.0/C um Milling 26,775 1000 50 10 53.6/Cum Initial Cost 5,767,800 4) Maintenance cost for concrete overlays will be same as that of new concrete roads. Table 9.

The cement concrete (CC) and asphalt layer interface condition (IC) greatly influences the structural response of thin white-topping (TWT) pavements. Limited literature is available on the quantification of the influence of CC-asphalt IC on stresses in CC layer. An attempt was made in the present study to evaluate the influence of the IC on the ...

Cement concrete roads offer advantages like a long life of more than 30 years, minimum maintenance, and 10-15% fuel saving for heavy vehicles. Cement concrete has been used for construction of new roads, highways and also for rehabilitation of existing distressed bituminous pavements. Rutting and potholing of bituminous pavements is a real ...

ULTRA THIN WHITE TOPPING ... Traditionally, concrete pavements are designed to absorb energy by bending are thus are constructed thick enough to resist the bending stresses. Short joint spacing allows the load to be carried with lower deflection and the joint movement is minimized. With UTW, short joint spacings are used so that the energy is ...

Portland Cement Concrete (PCC) overlay on an existing bituminous pavement is commonly known as White topping. The principal purpose of an overlay is either to restore or to increase the load carrying capacity or both, of the existing pavement. In achieving this objective, overlays also restore the ride-ability of the existing pavements which ...

this PPT 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 white topping (UTW) overlays among their various pavement rehabilitation alternatives. Although TWT and UTW overlays have been constructed for decades, their recent popularity is largely the result of a renewed ...

Whitetopping transforms rundown asphalt into durable, low-maintenance pavement that will last for decades. Asphalt wears out quickly and when it does, asphalt overlays and sealcoats are only a temporary fix. But whitetopping—a concrete overlay that covers damaged asphalt—is a long-term solution that actually grows stronger over time.

Concrete overlays have been used to rehabilitate bituminous pavements since 1918 in USA. There has been a renewed interest in White Topping, particularly on Thin White Topping (TWT) and Ultra-Thin White Topping (UTWT) over Conventional White Topping. Based on the types of interface provided and the thickness of overlay, classification is as ...

Ultra-thin whitetopping (UTW) is a concrete overlay 2 to 4 inches thick, with closely spaced joints, bonded to an existing asphalt pavement. The concrete industry's newest remedy for rutted asphalt pavements, UTW combines current concrete bridge deck overlay bonding technology with early sawing of closely spaced contraction joints. This produces a bonded composite pavement, with …

alternative for rejuvenation distressed bituminous pavement. White topping is a cement concrete overlay over the bituminous pavement, which has fewer failures, and act as good base layer for the overlay which will be a best option as the life of the pavement will be more when compared with bituminous overlay. ...

(4 in. concrete or less) overlays require closely spaced joints (48 in. or less) and may not be practical for rehabilitating high volume traffic roadways as targeted by the State of Colorado. Slightly thicker concrete sections (5 to 7 in.) and wider joint spacings (up to 12 ft) were studied in this research project.

White Topping is defined as a Portland Cement Concrete (PCC) overlay constructed on the top of the existing distressed bituminous pavement. White Topping is a PCC resurfacing (overlay) as a rehabilitation or structural strengthening alternative on bituminous pavement.

Cement concrete has been also used for the rehabilitation of existing distressed bituminous pavements. Rutting of bituminous pavement is a real problem in hot climate like in India with heavy truck loads operating under frequent start/stop conditions. It is commonly applied where rutting of bituminous pavements is a recurring problem.

• conventional white topping: slab thickness of eight inches or more. Whether whitetopping is a good candidate for the rehabilitation of deteriorated HMAC pavement depends on the supporting capability of the existing HMAC pavement.

UltraTech White Topping was developed to address these critical issues and make city roads safer and pothole-free. In essence, White Topping is a Portland Cement Concrete (PCC) overlay that is constructed on top of an existing bituminous road. This overlay acts as a long-term alternative for the rehabilitation or structural strengthening of roads.

In the present work, white topping is considered as the concrete overlay over 150 mm thick hot mix asphalt (HMA) pavement and has been modeled and analyzed by using ANSYS software.

Answer (1 of 2): White topping of roads is nothing but the laying of cement concrete instead of bituminous concrete, when the roads are concreted the initial cost will be rather high and the longevity of the surface will be more then the bituminous roads,and they are called as rigid pavement and...

Thin Whitetopping (TWT) is a 4 to 7 in. thick concrete overlay bonded to an existing ACP to create a composite section. TWT is typically constructed at intersections where rutting and shoving in asphalt pavement continue to cause problems. TWT may also be used at access or exit ramps to interstate highways, entire sections of urban roadways ...

Concrete overlay of deteriorated asphalt pavements (whitetopping) has been a viable alternative to improve the pavement's structural integrity for over six decades. The thickness of such overlay usually exceeds five inches. In the last few years, however, a newer technology has emerged which is commonly known as Ultra Thin Whitetopping (UTW).

Whitetopping is a safe long lasting covering of an existing asphalt pavement with a layer of Portland cement concrete. Whitetopping is divided into types depending on the thickness of the concrete layer and whether the layer is bonded to the existing asphalt roadway.

Thin white topping (i.e., bonded PCC overlay greater than 100 mm (4 inches) thick) is considered appropriate for all situations and traffic levels. UTW as conceived and developed in the early 1990's is intended more for lower-volume roads, vehicular parking areas and light duty airports (Mack, Hawbaker and Cole, 1998 [1]).

White topping concrete overlays/pavements are a cost-effective, sustainable choice for urban roads, state and national highways, and other pavement applications," says Mr O. P. Puranmalka, whole-time director, UltraTech Cement Ltd, who has been elected the new President of …

that this is the smoothest concrete pavement that anybody has ever ridden on in New York." A GOMACO GHP-2800 is slipforming the new concrete overlay on top of existing asphalt. A GOMACO T/C-600 texture/cure machine followed the paver and applied a longitudinal tine and white spray cure.

The thickness of whitetopping generally varies from four inches to ten inches. Based upon the thickness of the concrete overlay, it is known as ultrathin, thin, and conventional whitetopping. Whitetopping has immense potential to result in a stronger and more durable pavement with respect to …

pavement, or a bituminous concrete pavement over granular base. Conventional whitetopping is a PCC overlay of at least 4 inches, while an ultra-thin whitetopping is between 2 and 4 inches thick. The new concrete overlay is typically sawed partial-depth into square panels. The dimensions of …