• How to Determine Quantities - asphaltpavement.org

    Using the paving area in Figure 2, calculate the cubic yards of aggregate base and tons of asphalt pavement mixture needed, assuming the following: Areas A & B are to be paved using 4" of Aggregate Base and 3" of asphalt pavement mixture. Areas C & D are to be paved using 6" of Aggregate Base and 4" of asphalt pavement mixture.

  • Asphalt Thickness - Richfield Blacktop

    That is then compacted to 2 ½" thickness. That, combined with the carefully compacted sub-base, is the ideal thickness to provide maximum life and endurance for a residential driveway. If asphalt is applied too thickly, it won't be properly compacted, and over time, …

  • Chapter 4 Thickness Design - Home - APAI

    Thickness Design 4-1 Chapter 4 Thickness Design GENERAL CONSIDERATIONS Several procedures can be used to calculate the thickness of the proposed asphalt pavement. All are based on the volume and weight of the traffic that will use the facility and on the load-supporting capability of the underlying soil. The AASHTO Road Test and other studies

  • AASHTO Pavement Thickness Design Guide - cecalc.com

    • The average percentage of trucks expected to use the road • The average annual traffic growth rate, and ... Asphalt Treated Base Class I 0.34 ... pavement thickness; higher values decrease the required pavement thickness. ...


    The Maryland Asphalt Association recommends the use of these specifications. BASE DESIGNATIONS 19 MM Superpave Generally a minimum lift thickness of 3" is recommended. Aggregate sizes of the mix design should be checked prior to use in thinner lifts. 12.5 MM Superpave Generally a minimum lift thickness of 2" is recommended.

  • Asphalt Pavement Guide: Thickness - eastcoatpavement.com

    Jan 12, 2018· For a heavy-duty parking lot with an aggregate base, it is recommended to install a 6" thick hot mix asphalt layer on a 3" aggregate base layer. If your driveway or parking lot is not paved to the proper thickness, your asphalt will likely begin to deteriorate prematurely. Subgrade preparations, base application and thickness, as well as ...

  • How to Install Asphalt: 10 Steps (with Pictures) - wikiHow

    Mar 29, 2019· How to Install Asphalt. A driveway paved with asphalt can last as long as 15 years. Asphalt is durable, resilient and low-maintenance. ... This type is usually called '3/4" minus' or 'Road-base' mix. If your underlying soil is clay-based, you will need 8 inches (20.32) of crushed rock. ... Choose an asphalt size and thickness.

  • Road Standards and Paving Standards - astm.org

    The types of paving covered by these standards are typically made of asphalt, concrete, and bituminous materials. These road and paving standards allow geotechnical engineering firms and construction companies to examine and evaluate paving materials to ensure strength and durability towards safe application and use.

  • Road Design Manual Chapter 6 - Jboss Home Page

    MICHIGAN DESIGN MANUAL ROAD DESIGN CHAPTER 6 SURFACING AND SHOULDERS INDEX (continued) 6.02.07 Crushed Concrete Aggregate 6.02.08 Slag A. General B. Blast Furnace Slag C. Reverberatory Furnace Slag D. Steel Furnace Slag 6.02.09 Aggregate Base and Surface Courses A. General B. Difference between Base and Surface Courses C. Substitution

  • Typical Road Structure Cross Section - Sub Grade, Base ...

    It acts as a separating layer b/w subgrade and road base. By this it prevent the two layers from mixing up. b. Characteristics of materials used in Sub Base: ... The max dia of any particle shall not be greater than 2/3ed of the layer thickness of sub-base. Typical particle size distribution for the sub-base (granular) when will meet strength ...

  • 34553-03 Design Guide - pa-asphalt.org

    Asphalt Institute, Lexington, Kentucky, for his technical input and assistance in the ... Base Course Design Thickness Refer to Chart 19.5 mm, 25 mm Leveling (when required) Vari able Depth Refer to Chart 9.5 mm* Old Pavement ... 34553-03 Design Guide Author:

  • Pavement Design - Thickness Design - Durham University

    Pavement Design - Thickness Design. The thckness design of the pavement is the determination of the overall thickness of the road and the thickness of the individual layers. This is of course dependant on the type of material chosen for the road. ... If PA is used then it's contribution to the bituminous design thickness is 20mm. A 60mm base ...

  • Subgrade Preparation for New Pavements - Pavement Interactive

    For HMA pavements, the graded subgrade or the top granular base layer may be prepared with a primecoat if necessary. A primecoat is a sprayed application of a cutback or emulsion asphalt applied to the surface of untreated subgrade or base layers (Asphalt Institute, 2001 [2]). Primecoats have three purposes (Asphalt Institute, 2001 [2]):

  • Asphalt Treated Base (ATB) | Washington Asphalt Pavement ...

    Asphalt treated base (ATB) is a dense-graded HMA with a wide gradation band and lower asphalt content intended for use as a stabilizing base course. ATB costs less than typical HMA mixes because it can be produced with less expensive aggregates and lower percentages of asphalt binder.

  • Road surface - Wikipedia

    A road surface or pavement is the durable surface material laid down on an area intended to sustain vehicular or foot traffic, such as a road or walkway.In the past, gravel road surfaces, cobblestone and granite setts were extensively used, but these surfaces have mostly been replaced by asphalt or concrete laid on a compacted base course.Road surfaces are frequently marked to guide traffic.

  • Asphalt Versus Concrete — Which Is Stronger?

    Mar 01, 2006· Asphalt Versus Concrete — Which Is Stronger? ... of 1.0 for each inch of thickness. On this scale a 6-inch thick base would have a Structural Number of 6.0 and a 10-inch thick base …

  • Thickness Design Pavements - McAsphalt

    Thickness Design e Pavements INTRODUCTION Throughout North America, the term "flexible pavement structure" is understood to include the subgrade, base course, and asphalt wearing surface, Figure 1. There is also general agreement that the designation "flexible pavement" refers to the combination of layers above the sub-

  • What makes a good asphalt driveway? | Asphalt magazine

    What makes a good asphalt driveway? By John Davis and Dwight Walker, P.E. ... "Putting down a rock base before placing the hot mix is critical," Prather says. "The size or thickness of the rock makes a difference. We use 2-inch (top-size) rock—as big as your fist. The 2-inch rock sinks into the subgrade and stabilizes the earth," adds ...

  • Asphalt Driveway Thickness - All About Driveways

    Asphalt driveway thickness is very important to the longevity of an asphalt driveway. ... first, on the front range, the soils tend to be expansive soils so most contractors excavate and install 3" to 6" of road base and then install 3" of compacted hot asphalt. ... the only way to ensure the right thickness of base and asphalt for your soil ...

  • How Thick Should an Asphalt Driveway Be? | Garden Guides

    Asphalt Pavement. The thickness of an asphalt driveway is in part determined by the proportion of liquid asphalt, sand and aggregate in the asphalt mix. Spreading a 3-inch-thick layer of asphalt over the gravel base is thick enough to provide a smooth, solid surface for vehicles.

  • Asphalt Pavement Construction - Asphalt Institute

    At one time it was thought that a prime coat was an essential element of good pavement construction. However, in recent years some engineers have eliminated the use of a prime, especially when asphalt layer(s) (surface and/or base) is 4 inches or more in thickness.

  • The Complete 7-Step Process for Asphalt Pavement Installation

    Sep 28, 2016· The sub base is a frost barrier to help reduce winter damage due to freezing and thawing. During the installation, base thickness, base stability and compaction are important steps. If the sub base is not appropriately compacted, the asphalt surface on top will not provide years of durability. Step 4: Proof Roll, Undercutting and Sub Base Repair

  • South Carolina Asphalt Pavement Association

    South Carolina Asphalt Pavement Association Jayson Jordan, PE Technical Director ... – Road Rehab Strategies – Asphalt Topics The Asphalt Resource For South Carolina! WWW.SCASPHALT. ... Aggregate Base Thickness (in) SAMPLE DESIGN CHART [MEDIUM SUBGRADE] 0 2 4 6 8 10 12

  • Asphalt Pavement Thickness and Mix Design - Asphalt ...

    Is the pavement structure (subgrade, subbase, base, and all asphalt layers) adequate to support the loads? You need to purchase our MS-23 Manual, Thickness Design of Asphalt Pavements for Heavy Wheel Loads. Is the hot mix asphalt surface stiff enough to resist deformation (ruts or indentations)?

  • HD 26/06 - PAVEMENT DESIGN - Standards for Highways

    pavement thickness beyond that required for 80 msa, provided that surface deterioration is treated before it begins to affect the structural integrity of the road. 2.16 For 'long-life' flexible pavements with an HBM base, a total 180mm thickness of asphalt overlay to HBM base is …

  • Base course - Wikipedia

    The base course or basecourse in pavements is a layer of material in an asphalt roadway, race track, riding arena, or sporting field.It is located under the surface layer consisting of the wearing course and sometimes an extra binder course.. If there is a sub-base course, the base course is constructed directly above this layer.

  • Asphalt Concrete Base (ACB) - Pavement Interactive

    Asphalt concrete base (ACB), also called asphalt treated base (ATB), is a dense-graded HMA with a larger nominal maximum aggregate size (1 inch) intended for use as a base course or binder course (see Figure 1). In addition to site paving benefits, ACB can be advantageous because it can provide: A waterproof barrier to prevent fines infiltration into the subgrade and pavement structure.

  • Proper Base and Subgrade Construction for Parking Lots

    Proper Base and Subgrade Construction for Parking Lots. Strength is essential for a long-lasting paving project. And it all begins with the base and subgrade. In fact, 80-90% of the strength of a road or parking lot is provided by the aggregate base. All underground utilities must be protected or relocated. Topsoil is removed.