Joint – concrete
A joint in concrete is a pre-planned crack and provide relief from tensile stress and consist of several types:
Joint - construction
A construction joint is a surface where two successive placements of concrete meet.
A vibrating wire joint meter is used for monitoring movement of joints in mass-concrete structures and has a built-in thermistor for temperature monitoring.
Joint - rock
A rock joint is a natural fracture in the formation in which there is no measureable shear displacement.