This report contains the results of experiments performed to discover the suitability of the concrete retarder Plasitment for Minnesota Department of Highways construction projects.
This investigation is conducted every year for the purpose of securing information as to the compressive strength and thickness of concrete pavements as constructed under present methods, and to ascertain these factors as they pertain to specification requirements.
The following data are obtained for each core drilled: project number, station and location with respect to center line at which each core was drilled, date concrete was placed, date drilled, date core was tested, the height, strengths, and diameter of each core. In the summary of results some of the data is omitted and some is indicated in a different form. The date placed is omitted and the age when drilled and the age when tested is used in place of the drilling and testing dates. The height of the core as shown in the report is the height prior to capping.
The location from which the core was taken is measured in the field and the data submitted with the cores for use in the report. Side cores were generally taken two feet from the outer edge of the pavement, and the center cores were taken two to six feet from the center line.
