Oct 01, 2021 An ultra-thin ( 1) bonded asphalt wearing surface (UBAWS) is a hot mix asphalt (HMA) overlay placed over a heavy asphalt emulsion layer or membrane. The thickness ranges from 1/2 in. to 3/4 inch. The table below lists the minimum lift thickness for each UBAWS type based on the nominal maximum aggregate size allowed for the mixture.
Without preventive maintenance over the course of its life cycle, the costs to restore that pavement can more than quadruple. HMA Ultra-Thin Makes Dollars and Sense. Most common surface maintenance treatments only delay the inevitable. But a thin overlay of hot-mix asphalt - such as HMA Ultra-Thin - not only provides a new pavement surface for a fraction of the cost of starting over, its the only
and WMA, into engineered asphalt mixtures used for pavement preservation strategies including high performance ultra-thin lift overlays (UTOL). UTOL have a thickness of one inch or less and are used in applications requiring higher levels of rutting and fatigue cracking resistance. Northeast Asphalt User Producer Group Meeting
Jun 26, 2020 Thin overlay is a thinner overlay compared to traditional overlay (usually more than 40 mm thick). Generally, the hot-mixed asphalt concrete cover with a compacted thickness of 30 mm 5 mm is called a thin overlay. The main functions of the thin cover are to improve the flatness, restore the surface roughness, make the original surface damage ...
Price Ultra-thin overlays are an affordable way to reap the many advantages of concrete pavement, and it is competitively priced with asphalt overlays. Ease of placement Surface preparation is minimal, and paving can be accomplished with the same equipment used in conventional concrete installation.
This work consists of constructing an ultrathin bonded asphalt concrete wearing surface. The ultrathin bonded asphalt concrete consists of application of a warm polymer modified asphalt emulsion followed immediately with a 5/8 inch (16mm) minimum hot asphalt concrete overlay. 874.02 Materials. Conform to the following requirements
vation by thin asphalt overlays, materials selection and mix design, construction practices including quality control, and the performance history of thin asphalt overlays. Thin asphalt overlays as used in this guide are surface mixes of 1.5 inches or less placed on a
2. HMA Ultra-Thin Overlay. The Ultra Thin HMA Overlay shall be composed of a mixture of aggregate, asphalt binder, and if required, mineral filler, as listed in Table 1. Table 1 - HMA Ultra-Thin Overlay Mixture Requirements Parameter Low Volume Comm. ADT 380 Medium Volume Comm. ADT 380 - 3400 High Volume Comm. ADT 3400 Marshall Air Voids %
depth of the original asphalt of the two 12 lanes with vari-able width gravel shoulders was 7 thick. For the UTW overlay, 2- 4 of the existing asphalt pavement was cold-milled and then 4 of concrete pavement was placed. An UTW overlay is known as a thin (2-4) concrete overlay bonded to a milled, existing AC surface.
Ultra Thin Whitetopping State-of-the-Practice Ultra-Thin Whitetopping (UTW) The State-of-the-Practice Mike Byers Indiana Chapter American Concrete Pavement Association Ultrathin Whitetopping A concrete overlay, 2 to 4 thick with close joint spacing, bonded to the existing asphalt pavement. - May or may not contain fibers Ultra-Thin ...
The Ultra-Thin Bonded Wearing Course Process The UTBWC process consists of a heavy spray application of polymer modified asphalt emulsion followed immediately by an ultra-thin gap-graded hot mix asphalt. Both applications are quick completed in one pass by a specially designed paving machine. Once the hot mixed asphalt is placed, a 10-ton ...
Asphalt Overlay Program Construction Methods Presented by TexasBit Material Equipment Selection Level-up mix Surface Mix Ultra-Thin Overlay, TOM, CAM, Type D, Super-pave, MAC Spray Paver vs. Hot Applied Membrane vs. Conventional Benefits of Recycled Materials how they help asphalt performance
To address the severe distresses of asphalt pavement, a new type of pavement maintenance treatment, porous ultra-thin overlay (PUTO) with small particle size was proposed. The PUTO has a thickness of 1.52.5 cm and a large void ratio of 1825%. As a newly asphalt mixture, the structure characteristics differ from poor traditional pavement.
iii) Ultra-Thin Whitetopping (UTWT) PCC overlay of thickness equal to or less than 100 mm is classifiedas Ultra-Thin Whitetopping (UTWT). Bonding between underlying bituminous layer and overlaid PCC layer is mandatory in case of Ultra Thin Whitetopping. Milling
Ultrathin bonded overlays (UTBOs) also called ultrathin bonded wearing courses (UTBWCs), ultrathin bonded asphalt sur-faces (UBASs), and ultrathin asphalt con-crete surfacings (UTACSs)are constituted of a heavy application of polymer modified asphalt emulsion, followed by an ultra-thin (0.5 to 1.0-in.), polymer modified,
Ultra thin lift asphalt treatments are generally applied at a compacted depth of .75 to 1 on roads in good condition. This pavement preservation application provides a smooth surface, while addressing raveling, low-severity top-down cracking and oxidation. Higher initial cost compared to other preservation treatments especially if milling ...
May 17, 2021 One such method was Ultra-Thin Bonded AC Overlays, otherwise known as Thin Hot Mix Asphalt Concrete Overlays (THMACO). THMACO is a unique process that provides a highly functional wearing course with a thin layer of plant-produced asphalt concrete. At the time, the material was almost exclusively placed with a spray-bar paver.
The PPRA folks stated it succinctly Because the overlay is thin, the interface between the old and new pavement is in close proximity to the shear forces created by vehicles during braking and turning movements. As a result, the tack coat is extremely important to the long term success of ultra thin lift asphalt.
Thin lift asphalt overlays can be used to address functional issues, safety issues as well as maintain roadways under all traffic conditions as a pavement preservation technique. Project selection is a key issue for thin asphalt overlays. Thin overlays of structurally
Types of Thin HMA Surfacings Dense-graded mixes Continuously graded, Superpave High Performance Thin Overlay (HPTO) Open-graded mixes 15-22% voids, fibers and polymer or crumb rubber Used to reduce splash and spray, improve high speed friction and reduce tire noise Gap-graded systems SMA and SMAR mixes (9.5mm 12.5mm) Ultra-Thin systems (Novachip)
ULTRA THIN ASPHALT INTRODUCTION This Technical Note provides a description of Ultra Thin Asphalt (UTA) and explains changes to previous specication requirements for mix design and placement of UTA, aimed at improving overall performance. A summary of technical requirements with suggested applications and limitations of UTA is also provided.
Ratio, Performance Thin Asphalt Lift Overlays 1 9.5mm PG64E22, HDFV, Level 1 placed with a high residual tack coat 4.75 mm PG64E22, HDFV, Level 1 placed with a high residual tack coat Open Graded Friction Course placed with a high residual tack coat. ... C Ultra Thin Bonded Wearing Course (UTBWC) $6.32 $145.00 ...
Thin asphalt layers (i.e. 30mm) are most suited as a surfacing for new residential works and for the overlay of both urban residential and city streets. The performance of this layer does not contribute significantly to the structural
West Contracting is a certified, licensed applicator for Ultra Thin Bonded Asphalt (UBAWS or UTBWC) also known as NovaChip. The NovaChip process was developed in the 1990s to provide a superior surface treatment on heavily traveled roads.
Apr 01, 2021 Moreover, ultra-thin asphalt overlays are a cost-effective preventative maintenance treatment. When compared with other treatments, the cost per mile per year ranges from $6,000 to $8,000 against $11,000 for chip seal or micro-surfacing. The final result of that 2004 paving operation.
Thin and Ultra-Thin Concrete Overlays of Existing Asphalt Pavements, Task 2 Review and Selection of Structural Response and Performance Models Julie M. Vandenbossche, Principal Investigator Department of Civil and Environmental Engineering University of Pittsburgh December 2011 Research Project Final Report 2011-25
Feb 23, 2021 Ultra-Thin Asphalt Overlay. Ultra-Thin HMA is applied with an asphalt paver and promptly compacted with a steel wheel roller. This treatment is ready for traffic almost immediately after compaction. Thin HMA overlays provide a new asphalt surface and prolong the pavement structure life. This thin (0.5 to 1.0 inch) surfacing provides the ...
Dec 18, 2006 The NovaChip paving process places an ultra-thin, coarse aggregate hot mix over a special asphalt membrane applied in one pass over the existing pavement surface. ... While premium overlays
T1 - Backcalculation procedure for bonded concrete overlays of asphalt pavement. AU - King, Daniel. AU - Roesler, Jeffery R. PY - 2014/1/1. Y1 - 2014/1/1. N2 - Bonded concrete overlays of asphalt (BCOA), previously known as ultra-thin whitetopping, have become increasingly common in
Development of Design Guide for Thin and Ultra-thin Concrete Overlays of Existing Asphalt Pavements, 5. Report Date May 2011 Task 1 Report Compilation and Review of Existing Performance Data and Information 6. 7. Author(s) 8. Performing Organization Report No. Julie Vandenbossche, Manik Barman, Feng Mu, Kerri Gatti 9.
Thin Overlay Mixture (TOM) - Construct a thin friction course overlay surface mix composed of a compacted mixture of aggregate and asphalt binder mixed hot in a mixing plant and placed at a lift thickness of 3/4 to 1-1/4 inch. Districtwide Use.
May 24, 2018 Ultra-thin Whitetopping 6 Unbonded Concrete Overlay 6 Spall Repair . 6. . . Asphalt Overlay, Structural 6 Sawing and Sealing AC Overlay 7 Full Depth Slab Replacement, Asphalt 7 Full 8Depth Slab Replacement, Concrete Reconstruction, Asphalt or Concrete. 8 ASPHALT CONCRETE PAVEMENT Hot Mix Asphalt Overlays 9 Superpave HMA 9 HMA, Open Graded ...