Study of the Idaho Degradation Test and Other Methods for Assessing Aggregate Quality

Details

• Creators:
  Zhai, Huachun ; Russell, Erin ; Munger, John ; Sale, Collin ; Lu, Yang ; Wang, Donglei
• Corporate Creators:
  Idaho Asphalt Supply, Inc. ; Boise State University
• Corporate Contributors:
  Idaho Transportation Department ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Aggregate Tests Clay Degradation Failures Durability Tests Materials Petrography Specifications Test Procedures
• Publication/ Report Number:
  FHWA-ID-24-313
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Idaho
• Edition:
  Final Report: 05/24/2023 – 07/24/2024
• Corporate Publisher:
  Idaho Transportation Department
• Abstract:
  The Idaho Degradation Test was modified to standardize the procedure and improve the repeatability of the test. An evaluation of the temperature and time needed for sample preparation was conducted to accelerate the test process. Based on a national survey conducted by the research group, the Durability Index and the Micro-Deval abrasion loss tests were selected as supplement tests. Twenty-five samples from sixteen aggregate sources selected by the Districts throughout the State were evaluated using the Modified Idaho Degradation Test (MIDT), the Durability Index, and the Micro-Deval Tests for both coarse and fine aggregates. The X-ray Diffraction (XRD) test, the petrographic analysis, and the methylene blue test were used to identify the mineralogy of the aggregates, the clay content, and the reactivity of the clay components. The results indicated by the change in P200 values before and after the MIDT (DP200) values showed similar repeatability to the sieve test using a uniform gradation. The effects of clay on the SE values in the MIDT were highly rock-type dependent. Although the Durability Index (Df) was also determined using the SE test, there were no strong correlations between the Durability Index and the SE values from the MIDT. While the percentages of abrasion loss of the coarse aggregate lacked a relationship to the DP200 values, there was a strong correlation between the abrasion loss of the fine aggregates and DP200 (R2 ~0.94). This strong correlation was used to calculate the recommended acceptable specification values for DP200.
• Format:
  PDF
• Funding:
  T002983
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:5844dae07b8571674412548d22ae60e3fbd5fd69cf8e3cca7ef73e4b131b1d96b98d5dfdee125294be788409623256b064356bf7541e83739309d06b1b48e17f
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/90135/dot_90135_DS1.pdf
• File Type:
  [PDF - 4.60 MB ]