Base Courses Class 19.0 HMA 3 5 Base or other underlying layers. Preferred mix for lifts greater than or equal to 3” Class 12.5 HMA 2 3 Surface, Base or other underlying layers. Patching, Utilities, Waterways Dense Surface Courses Class 9.5 HMA 1 2 Surface, Bridges, Driveways, Leveling, Patching, Utilities, Waterways, Misc.

base course asphalt shall be used to set the proper elevation of the top of subbase. Underdrain shall be placed at the outside edge of shoulder, Item 605.0901, Underdrain Filter Type 1. Pavement Structure - Pavement Interactive Surface courses are most often constructed out of HMA. Base Course. The layer immediately beneath the surface course. It provides additional load distribution and contributes to drainage. Base courses are usually constructed out of crushed … SUBJECT: HOT MIX ASPHALT (HMA) MIXTURE DESIGN AND … This MM outlines a complete procedure for the uniform design of volumetric mixtures for 6.3 Top Course HMA, 9.5 Top Course HMA, 12.5 Top Course HMA, 19.0 Binder Course HMA, 25.0 Binder Course HMA, or 37.5 Base Course HMA. Standard Washington State Hot Mix Asphalt Types Dense-graded 1-1/4 inch HMA primarily intended for use as a base course. This was WSDOT’s “standard” base course paving mix that could also be used as a heavy duty surface mix. Class E was supplanted by the current Class 1 inch HMA Superpave mix design.

Surface courses are most often constructed out of HMA. Base Course. The layer immediately beneath the surface course. It provides additional load distribution and contributes to drainage. Base courses are usually constructed out of crushed …

HMA base courses are typically dense-graded mixtures with nominal maximum aggregate sizes ranging from 19 to 37.5 mm. Leveling Course A leveling course is a thin layer of variable thickness used in rehabilitation to correct variations in the longitudinal or transverse profile of the pavement. Eileen Sheehy Manager, Bureau of Materials

Base course - Wikipedia

Jul 29, 2013 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 … Road Design Manual Chapter 6 For example, a 30’ asphalt-surfaced pavement being widened to five 12’ lanes (60’) should probably have a 3’ base course widening and a 12’ (perhaps monolithic) lane of concrete pavement on each side. (Full-depth HMA construction is an alternative.) See Section 6.04.09, "Concrete Widening". Hot Mix Asphalt (HMA) Selection Guidance - December 2017