TM 5-623
Figure B-82. High-severity divided slab caused by high-
Figure B-83. High-severity divided slab.
severity cracks.
Figure B-84. High-severity divided slab.
How to Count:
If the slab is medium or high-severity, no other distress is counted.
Name of Distress:
Durability ("D") Cracking.
Description:
"D" cracking is caused by freeze-thaw expansion of the large aggregate which,
over time, gradually breaks down the concrete. This distress usually appears
as a pattern of cracks running parallel and close to a joint or linear crack.
Since the concrete becomes saturated near joints and cracks, a dark-colored
deposit can usually be found around fine "D" cracks. This type of distress
may eventually lead to disintegration of the entire slab.
Severity Levels:
L-"D" cracks cover less than 15 percent of slab area. Most of the cracks are
tight, but a few pieces may have popped out (figs B-85 and B-86).
B-28
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