A mechanical gauge was developed to monitor the movement of crack or joint openings in portland cement concrete structures (in general) and in overlaid and portland cement concrete pavements (in particular). Designed to be inexpensive and simple to operate, this gaugecan record maximum, minimum, and instantaneous crack or joint openings. The design and manufacturing of such a gauge along with the field data collected from the prototype gauges installed at the pavement durability research facility of the pennsylvania transportation institute are presented. The gauges were monitored from january 1990 to the end of february 1990 and from may 1990 to the middle of july 1990. These monitoring periods gave a wide range of expected temperatures and joint openings. Specific recommendations are made for recording minimum and maximum pavement temperature over the monitoring period. This paper appears in transportation research record no. 1307, Pavement analysis, design, rehabilitation, and environmental factors 1991.
Abstract