01722466

Component

http://www.trb.org/Main/Blurbs/179718.aspx

This paper summarizes the development and validation of the IDEAL cracking test (IDEAL-CT) method. The test was evaluated for its ability to be sensitive to mixture properties that control performance. The IDEAL-CT is similar to the traditional indirect tensile strength test, and it is run at the room temperature with cylindrical specimens at a loading rate of 50 mm/min. in terms of cross-head displacement. Any size of cylindrical specimens with various diameters (100 or 150 mm) and thicknesses (38, 50, 62, 75 mm, etc.) can be tested. For mix design and laboratory quality control/quality assurance, the authors proposed to use the same specimen size as the Hamburg wheel-tracking test: 150 mm diameter and 62 mm height with 7±0.5% air voids, since agencies are familiar with molding such specimens. Either lab-molded cylindrical specimens or field cores can be directly tested with no need for instrumentation, gluing, cutting, notching, coring or any other preparation. Findings from the validation suggest that the IDEAL-CT is a simple, practical, and efficient cracking test that can be performed with regular indirect tensile strength test equipment. The IDEAL-CT is sensitive to key asphalt mix components and aging, and it also has much lower coefficient of variation (COV) than traditional repeated load cracking tests. The IDEAL-CT correlated well with two other cracking tests—Texas OT and Illinois I-FIT. The IDEAL-CT also correlated well with field performance in terms of fatigue, reflective, and thermal cracking. Currently, several departments of transportation are either evaluating or considering the IDEAL-CT for potential adoption.

01722465

English

pp 1-21

2019-9

Transportation Research Circular

Digital/other

Figures; References; Tables

Asphalt mixtures; Asphalt pavements; Cracking; Laboratory tests; Test procedures

Highways; Materials; Pavements

TRIS, TRB, ATRI

Nov 14 2019 12:03PM

• Development of the Illinois Flexibility Index Test
• Evaluating Balanced Mixture Design for New Jersey to Enhance Asphalt Mixture Durability
• Implementation of Balanced Mixture Criteria During Asphalt Mixture Design: Louisiana’s Experience
• Relating DC(T) Fracture Energy to Field Cracking Observations and Recommended Specification Thresholds for Performance-Engineered Mix Design