A bituminous coating, with or without aggregate, applied to the surface of a pavement for the purpose of waterproofing, preserving, or rejuvenating a cracked or raveling bituminous surface, or to provide increased skid resistance or resistance to abrasion by traffic.
The ability at time of observation of a pavement to serve traffic (autos and trucks) which use the facility.
Localized vertical displacement of the pavement structural section due to slippage of a fill or consolidation of the underlying foundation, often resulting in pavement cracking and a poor ride quality.
Localized displacement or bulging of pavement in the direction of loading pressure produced by stopping, starting or turning movements. The pavement may have low tensile strength and delamination or may have bleeding from too much asphalt in the mix. Shoving the pavement forward often produces corrugations ahead of the shoving and crescent-shaped cracks behind.
Single Axle Load:
The total load transmitted by all wheels whose centers may be included between two parallel transverse vertical planes extending across the full width of the vehicle.
A mixture of mixing-type asphaltic emulsion, fine mineral aggregate and water proportioned, mixed and spread primarily on asphalt concrete pavement for maintenance purposes.
Cracking, breaking, chipping of the edge of a crack in which small portions of the pavement are dislodged. Spalling is caused primarily by non-uniform support in conjunction with vertical movement due to wheel loads or incompressibles confined in the opening.
Stress Absorbing Membrane Interlayer (SAMI):
An interlayer placed within or at the bottom of an asphalt concrete overlay or layer to retard reflective cracking and prevent water intrusion. Examples include a rubberized chip seal interlayer (SAMI-R) or pavement reinforcing fabric (SAMI-F).
The loss of the adhesive bond between asphalt cement and aggregate, most often caused by the presence water in asphalt concrete, which may result in raveling, loss of stability and load carrying capacity of the asphalt concrete pavement or treated base.
Structural Section Drainage System:
A drainage system used for both asphalt and portland cement concrete pavements consisting of a treated permeable base layer and a collector system which includes a slotted plastic pipe encapsulated in treated permeable material and a filter fabric barrier with unslotted plastic pipe as vents, outlets and cleanouts to rapidly drain the pavement structural section
The planned, engineering-designed layers of specified materials (normally consisting of sub base, base, and pavement surface) placed over the basement soil to support the traffic loads anticipated to be accumulated and applied during the design period. The structural section is also commonly called the pavement structural section.
A layer of aggregate of designed thickness and specified quality placed on the basement soils as the foundation for a base.
That portion of the earth on which pavement surfacing, base, sub base or a layer of any other material is placed.
Surface Attrition (“Abrasion”):
Abnormal surface abrasion wears pavement, resulting from either a poor quality surface or exposure to abnormal abrasive action (such as tire chains and sanding materials) or both.
The top layer of AC pavement. It is also sometimes called the “wearing course”.
The loss of the original pavement surface texture due to traffic.
In-place heating of the surface of asphalt concrete pavement followed by scarification, remixing, and compaction, generally to a depth of about 20 mm. This is considered to be a maintenance procedure.