15 March 2001
DISTRESS 75, SPALLING (CORNER)
17.1. Description. Corner spalling is the raveling or breakdown of the slab within approximately
2 feet (0.6 meter) of the corner. A corner spall differs from the corner break in that the spall
angles downward to intersect the joint, while a break extends vertically through the slab. Deduct
curves for corner spalling are shown in Figure 17.1.
17.2. Severity Levels.
17.2.1. L. One of the following conditions exists: (1) spall is broken into one or two pieces
defined by low-severity cracks (little or no FOD potential), (2) spall is defined by one
medium-severity crack (little or no FOD potential) (Figures 17.2. and 17.3.).
17.2.2. M. One of the following conditions exists: (1) spall is broken into two or more pieces
defined by medium-severity crack(s), and a few small fragments may be absent or loose; (2) spall
is defined by one severe, fragmented crack that may be accompanied by a few hairline cracks; or
(3) spall has deteriorated to the point where loose material is causing some FOD potential
(Figures 17.4. and 17.5.).
17.2.3. H. One of the following conditions exists: (1) spall is broken into two or more pieces
defined by high-severity fragmented crack(s), with loose or absent fragments; (2) pieces of the
spall have been displaced to the extent that a tire damage hazard exists; or (3) spall has
deteriorated to the point where loose material is causing high FOD potential (Figures 17.6. and
17.3. How to Count. If one or more corner spalls having the same severity level are located in a
slab, the slab is counted as one slab with corner spalling. If more than one severity level occurs, it
is counted as one slab having the higher severity level.