Condition Rating Systems

Condition Rating Systems

Based on measurements of roughness, surface distress, skid resistance and deflection, pavements can be assigned a score that reflects their overall condition.  This score, sometimes called a pavement condition rating, quantifies a pavement's overall performance and can be used to help manage pavement networks.  By carefully choosing the rating scale (called the condition index), pavement condition scores can be used to (Deighton 1997):

Pavement Management

Pavement Management

“Pavement management” refers to a systematic process of maintaining, upgrading and operating a network of pavements and involves three major components: the pavement life cycle, the costs associated with this life cycle and pavement management systems.

Standard Washington State Hot Mix Asphalt Types

Standard Washington State Hot Mix Asphalt Types

This section lists the standard HMA  mixes used in Washington State both today and prior to changing from the Hveem mix design method.  Most modern HMAs are listed to designate both the nominate maximum aggregate size of the mix and the PG (Preformance Grade) of binder used in the mix (e.g. – Class 1/2 inch PG 58H-22).

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 the HMA layer or out the sides of the HMA layer under moving loads.

Transverse (Thermal) Cracking

Transverse (Thermal) Cracking

Cracks perpendicular to the pavement's centerline or laydown direction.  Usually a type of thermal cracking.

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.