Concrete Joints

Longitudinal and transverse joints are an important feature of concrete roadways which allow for expansion, contraction and movement of road surfaces due to changing humidity and temperature. Joints effectively act as a controlled crack thus reducing the likelihood for cracks to occur in unplanned locations.

However, due to this very feature, it is possible for faulting to occur at joints. Faulting is a condition that is characterized as a difference in height between two abutting slabs.

PavemetricsTM Laser Crack Measurement System (LCMSTM-2) helps to automate the concrete joint inspection process by automatically detecting joints and measuring the height difference (the faulting value) between the two slabs. The number of measurements and position of measurements for faulting along a joint is user configurable.

Additionally, detected joints and adjacent surfaces may be optionally excluded from subsequent crack detection.

The position, length, perimeters and faulting value of each joint are reported are reported in XML and a variety of images may be output showing the detected joint, the positions used for faulting measurement and the maximum faulting value.

AASHTO

PP68; Can collect images of pavement surfaces
R36-17; Evaluate Faulting of Concrete Pavements

ASTM

D5340; Can be used for airport condition index surveys
D6433; Can be used for Roads and parking lot pavement condition index surveys

FHWA

Distress Indentification Manual for the Long-Term Pavement Performance Program
(joint seal damage, joint spalling, joint faulting, crack faulting)

Related Articles

Feasibility Study of Measuring Concrete Joint Faulting Using 3D continuous Pavement Profile Data
Authors: Yichang James Tsai, Yiching Wu and Chengbo Ai (Georgia Institute of Technology)