TM 5-826-6/AFR 93-5
(3) Measuring procedure. Shoving is measured by determining the area in square feet of the swell caused by
shoving.
o. Slippage cracking, distress 55.
(1) Description. Slippage cracks are crescent- or half-moon-shaped cracks having two ends pointed away from
the direction of traffic. They are produced when breaking or turning wheels cause the pavement surface to slide and
deform. This usually occurs when there is a low strength surface mix or poor bond between the surface and next layer of
pavement structure.
(2) Severity levels. No degrees of severity are defined. It is sufficient to indicate that slippage crack exists
(figs. A-60 and A-61).
Figure A-60. Slippage cracking, case 1.
Figure A-61. Slippage cracking, case 2.
p. Swell, distress 56.
(1) Description. Swell is characterized by an upward bulge in the pavement's surface. A swell may occur
sharply over a small area or as a longer, gradual wave. Either type of swell can be accompanied by surface
A-36
Previous Page
