25 May 2005
Flexible Pavement Types
General. The term "bituminous" is a generic term for both asphalt and tar
cements used in flexible pavements. The term asphalt is used in this document because
asphalt is commonly used while tar cement is rarely used. The most common high-
performance flexible surfacing for airfields is HMA. HMA is a mixture of mineral
aggregates and asphalt cement heated and mixed in a central batch plant and placed
and compacted while sufficiently hot so the required density and smoothness can be
Flexible Pavement (HMA). The principal components of flexible
pavement include an HMA surface course, a graded crushed aggregate base course on
a drainage layer, and prepared subgrade.
Flexible Pavement with Stabilized Base. A flexible pavement with a
stabilized base (in lieu of an aggregate base) on a drainage layer.
All Bituminous Concrete Pavement. A pavement consisting of an HMA
surface course on an HMA base course and a drainage layer.
Asphalt Surface Treatment. An application of liquid asphalt material
followed by a layer of aggregate. Multiple applications of surface treatment may be
used. Due to potential FOD, asphalt surface treatment can be used only on overruns.
Aggregate Surface. A surface of compacted crushed aggregates.
Resin Modified Pavement. An open graded asphalt concrete mixture
containing 25 to 35 percent voids which are filled with a resin modified portland cement
Slurry Seal. A slurry seal is a mixture of asphalt emulsion, fine aggregate,
water, and mineral filler that produces a fluid-like slurry that is generally squeegeed over
an existing worn, weathered, or cracked pavement to improve the quality of the
Rigid Pavement Types
General. A rigid pavement is considered to be any pavement that contains
portland cement concrete as one element. The principal components are the concrete
slab and drainage layer. A base course or stabilized layer may be included based on
Plain Concrete Pavement. A pavement consisting of non-reinforced
jointed rigid pavement.
Reinforced Concrete Pavement. A pavement consisting of jointed rigid
pavement that is strengthened with deformed bars or welded wire fabric.