501.3(r) 501.3(t) pavement edges and surface against rain, before initial set of concrete. If rain appears imminent, stop paving operations, immediately protect the pavement sides, and cover the concrete surface with protective material .
final acceptance of each phase of the project, the concrete pavement thickness will be determined in the presence of the Representative by drilling cores according to PTM No. 606 or by non- destructive thickness measurements according to PTM No. 605. Other methods of non- destructive thickness testing may be requested in writing for approval by the District Executive. The Department will divide the pavement into Lots representing not more than 3,000 square yards of pavement (n=5) in each traffic lane. Include ramps in a separate Lot(s). Se lect one of the following options for thickness determination:
within each Lot according to PTM No. 1. Provide a measuring apparatus conforming to PTM No. 614. The Representative will determine the core depth according to PTM No. 614. If any core measurement is deficient by more than 1/4 inch in required depth, drill additional cores in the presence of and for measurement by the Representative. Drill the additional cores at 100- foot intervals in both directions longitudinally from each deficient core, in the same traffic lane, until the depth is no more than 1/4 inch deficient. Each core will represent the condition in the same traffic lane for a distance of 50 feet in both directions longitudinally. The pavement is defective if any core measurement is deficient by more than 1/2 inch in required depth. Submit every fifth core as an information sample to the LTS where an evaluation will be made of the entrained air content according to PTM No. 623, and for 28- day compressive strength testing according to PTM No. 606. For a partial Lot, the Representative will randomly select one core, according to PTM No. 1, for testing. If the core strength is less than 3,500 pounds per square inch immediately perform an investigation of the concrete operations to determine the cause of the low strength. Provide a written evaluation of the problem and the proposed solution to the Department.
measurement locations within each Lot according to PTM No. 605. Determine the pavement thickness according to PTM No. 605 in the presence of the Representative. One retest will be allowed if any average sublot thickness measurement is determined to be deficient by more than 1/4 i