Water Bleeding and Pumping

Water Bleeding and Pumping

Water Bleeding and Pumping Water bleeding (left two photos) occurs when water seeps out of joints or cracks or through an excessively porous HMA layer.  Pumping (right-most photo) occurs when water and fine material is ejected from underlying layers through cracks in...
Water Bleeding and Pumping

Transverse (Thermal) Cracking

Transverse (Thermal) Cracking Cracks perpendicular to the pavement’s centerline or laydown direction.  Usually a type of thermal cracking. A large transverse crack caused by the pavement’s contraction in cold weather.  The crack has subsequently been...
Water Bleeding and Pumping

Stripping

Stripping The loss of bond between aggregates and asphalt binder that typically begins at the bottom of the HMA layer and progresses upward.  When stripping begins at the surface and progresses downward it is usually called raveling. A small pavement core showing...
Water Bleeding and Pumping

Slippage Cracking

Slippage Cracking Crescent or half-moon shaped cracks generally having two ends pointed into the direction of traffic. Slippage crack at an intersection due to stopping.  The direction of traffic is from top to bottom.  Most likely caused by poor bonding with the...
Water Bleeding and Pumping

Rutting

Rutting Pavement rutting is defined as surface depression in the wheelpath.  Pavement uplift (shearing) may occur along the sides of the rut.  Ruts are particularly evident after a rain when they are filled with water.  There are two basic types of rutting: mix...
Water Bleeding and Pumping

Raveling

Raveling The progressive disintegration of an HMA layer from the surface downward as a result of the dislodgement of aggregate particles. Raveling possibly resulting from segregation, temperature differentials or inadequate compaction. Raveling that is likely the...