Interlaboratory Study for the Indirect Tensile at High Temperature Test and Ideal Rutting Test
-
2025-02-01
-
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final Report May 2022 – November 2023
-
Corporate Publisher:
-
Abstract:The Indirect Tensile at High Temperature (IDT-HT) test and Ideal Rutting (IR) test were recommended for screening rut-susceptible asphalt mixtures in the Balanced Mix Design (BMD) process, based on a research study by the Virginia Transportation Research Council (VTRC). The Virginia Department of Transportation (VDOT) is in the initial stages of implementing the IDT-HT test as part of the BMD initiative for dense-graded surface asphalt mixtures with unmodified asphalt binders. However, for full implementation, additional considerations such as fine-tuning the test procedure and determining precision estimates of the test method are necessary, and this study specifically addressed these aspects for the IDT-HT and IR tests. The work included three tasks: a sensitivity assessment, an interlaboratory study (ILS), and a proficiency study. All tasks were based on evaluation of specimens from four mixtures with varying rutting potentials. The sensitivity assessment investigated factors such as specimen conditioning environment, loading rate, loading frame, and storage on test results. Findings revealed significant differences in specimen conditioning time between water bath and environmental chamber, and water bath-conditioned specimens consistently showing lower parameter/index values. Additionally, the repeatability characteristics of both tests were not significantly affected by conditioning environment, loading rate, loading frame, or storage. Moreover, loading rate, loading frame, and storage did not significantly affect IDT-HT and IR test results, especially in the context of single-operator precision estimates. Furthermore, preliminary performance criteria were established, requiring minimum strength and RT index values of 100 kPa and 62 for IDT-HT and IR tests, respectively, for specimens conditioned in a water bath at 54.4°C. Based on the outcome of this task, a Virginia Test Method was developed for the IDT-HT test.
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type: