Comparison between Nurse-Saul and Arrhenius equations

Abstract

The primary objective of the present study is to assess the use of the maturity method to determine the joint sawing window and the traffic opening time on whitetopping construction in Korea. To determine the joint sawing time, it is necessary to determine the minimum strength not to have raveling and to identify the safe time of drying shrinkage. The present study found that the minimum compressive strength for joint sawing was 4.41 MPa (45 kg/cm2) and drying shrinkage occurred just after the concrete temperature peaked. The Nurse-Saul function was used for determining the joint sawing window and the traffic opening time because it better predicted in-place strength. The present study determined that the joint sawing window ranged from 210 °C·h to 310 °C·h (actual time of 6.5 to 9 h) and that the traffic opening time was after maturity values reached 390 °C·h for the mix at 20 °C.