Definitions for "Cracks"
Fracture lines visible around the circumference and/or along the length of a sewer.
Fractures passing through or across grain boundaries without the inclusion of foreign elements.
A clean, crystalline fracture which passes through or across the grain boundaries without inclusion of foreign elements.
Break in the surface of the pavement. There are a number of factors that can cause cracking. Different types of cracks are; Block, Crocodile, Reflection, Shrinkage and Slippage.
static – Random, non-moving hairline cracks that only affect the concrete surface (also see craze cracks and plastic shrinkage cracks).
causes, prevention, and assessment
Fatigue - Progressive cracking in the base material, weld, or weld zone that is caused by pressure cycling or oscillatory stresses associated with the operation of the system. Girth Weld - Cracks in the weld or weld zone of the butt welds that connect sections of pipe. Seam Weld - Cracks in the weld or weld zone of the longitudinal seam weld of the pipe. Selective Corrosion - A localized corrosion attack along the bond line of electric resistance welds (ERW) and flash welds (FW), that leads to the development of a wedge shaped groove that is often filled with corrosion products.
Narrow splits or breaks in the container metal which may penetrate through the metal of the container. It may also be caused by fatigue. It is a major mechanism that could cause catastrophic failure.