15 March 2001
5.2.3. H. Blocks are well-defined by cracks that are severely spalled, causing a definite FOD
potential (Figures 5.7. and 5.8.).
5.3. How to Measure. Block cracking
in square feet (square meters)
area. It usually occurs at one severity level in a given pavement section; however, any areas of
the pavement section having distinctly different levels of severity should be measured and
recorded separately. For asphalt pavements, not including AC over PCC, if block cracking is
recorded, no longitudinal and transverse cracking should be recorded in the same area. For
asphalt overlay over concrete, block cracking, joint reflection cracking, and longitudinal and
transverse cracking reflected from old concrete should all be recorded separately.
5.4. Options for Repair.
5.4.1. L. Do nothing; apply rejuvenator.*
5.4.2. M. Seal cracks; apply rejuvenator;* recycle surface.
5.4.3. H. Seal cracks; recycle surface.
* Improperly applied rejuvenators or surface seals may cause skid problems on high-speed