Ruggedness Study of Specimen Preparation and Fine-Tuning of Test Methods for IDT-CT and IDT-HT Test

Details

• Creators:
  Boz, Ilker ; Habbouche, Jhony ; Taylor, Adam ; Moore, Nathan
• Corporate Creators:
  Virginia Transportation Research Council (VTRC)
• Corporate Contributors:
  Virginia. Department of Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Asphalt Mixtures Balanced Mix Design Cracking CT Index Data Analysis Evaluation Laboratory Tests Mix Design Performance Tests Rutting Specimen Preparation Specimens Strength Of Materials Test Procedures Variability

  More +
• Publication/ Report Number:
  FHWA/VTRC 26-R22
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Virginia
• Edition:
  Final Report
• Corporate Publisher:
  Virginia Transportation Research Council (VTRC)
• Abstract:
  The Virginia Department of Transportation utilizes the indirect tensile cracking test (IDT-CT) and the indirect tensile at high temperature (IDT-HT) test as part of its balanced mix design framework to evaluate asphalt mixture performance and support performance-based acceptance decisions. Although these tests are critical tools for assessing performance characteristics, considerable variability has been observed in test results, raising concerns about the effects of specimen preparation procedures on the repeatability and reliability of the outcomes. This study was undertaken to systematically evaluate the influence of key specimen preparation factors on IDT-CT and IDT-HT test results and to establish clear, data-driven guidelines to standardize preparation practices. The experimental program included a ruggedness phase and a fine-tuning phase. Each phase was designed to identify and quantify the effects of critical preparation variables. Factors evaluated included mixture homogenization, splitting methods, heating duration, container type, specimen reheating, and heating processes. Laboratory testing was conducted on a range of asphalt mixtures using controlled procedures, and statistical analyses were performed to determine the significance of preparation factors on the test indices.
• Format:
  PDF
• Funding:
  124496
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:7659fdf1359a0600b20b0c17e7d983e4859437f403f0467aeb7d9a40014f253cb04786d3ddede5cdc09bcb00261474716a137c674987bf2dc264d2de06310029
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/87588/dot_87588_DS1.pdf
• File Type:
  [PDF - 1.07 MB ]