Development of Pavement Temperature Prediction Model
-
2020-08-01
-
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final Report 01/01/2019 - 08/31/2020
-
Corporate Publisher:
-
Abstract:Pavement temperature has a significant effect on the deflection measured using the falling weight deflectometer (FWD) or traffic speed deflectometer (TSD). Pavement temperature is used to adjust the backcalculated asphalt concrete moduli or deflection at a reference temperature. The current practice is to drill holes at the mid-depth of the top asphalt layer and filling the holes with mineral oil. The temperature of the mineral oil is measured at the time of FWD testing to reflect mid-depth pavement temperature. These holes are drilled every three miles along the FWD survey. Drilling holes before FWD testing requires traffic control that causes traffic delays and puts the Idaho Transportation Department (ITD) crew in the line of traffic. In addition, although this procedure provides accurate measurements for the mid-depth pavement temperature at the locations of the holes, temperature interpolation is used to estimate the temperature at locations between holes. TSD measures pavement deflection at highway speed and drilling holes is not feasible while performing the TSD evaluations. Alternatively, pavement temperature can be estimated using prediction models. This study examined the feasibility of predicting pavement temperature as a function of pavement surface temperature, average air temperature the day before testing, depth, and time of testing. Several existing models were examined along with considering new prediction models. Based on the statistical analysis, the researchers selected and recommended two models: the calibrated BELLS2 model and Idaho 7-Term model for predicting pavement temperature. Both models can predict pavement temperature with good accuracy and low bias. ITD can utilize the prediction models to predict pavement temperature without the need to drill holes which can save time and resources and improve the safety of the ITD FWD crew in the field.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type: