@article{ding_jeong_lee_underwood_kim_castorena_2023, title={Repeatability and Reproducibility Analysis for Functional Test Results from Asphalt Mixture Performance Tester Cyclic Fatigue Test}, volume={4}, ISSN={["2169-4052"]}, url={https://doi.org/10.1177/03611981231159409}, DOI={10.1177/03611981231159409}, abstractNote={ The standards for asphalt mixture performance tester (AMPT) cyclic fatigue testing (AASHTO T 400-22 and AASHTO TP 133-21) enable pavement engineers to predict asphalt mixture performance over a wide range of loading and climate conditions. To enable widespread implementation of AMPT cyclic fatigue testing, precision statements that define the repeatability and reproducibility of the tests are needed. ASTM E691-20 and ASTM C670-15 provide guidance for conducting an interlaboratory study to determine the precision of a test method. However, the standards are written for test methods that yield a single numerical figure as the test result, whereas the cyclic fatigue test yields the damage characteristic curve—a functional relationship—as a primary test result. In this study, a vnorm index was established to quantify variation in the entire damage characteristic curve. Repeatability and reproducibility analysis was conducted using vnorm, six single-point measures of damage characteristic curve variation, and one single-point measure for the fatigue test failure criterion ( D R). The major findings are: (1) the outcomes of repeatability and reproducibility analysis using single-point measures of the damage characteristic curve vary with the chosen point of reference; (2) vnorm demonstrates clear increases in within- and between-laboratory variations with increasing mixture nominal maximum aggregate size (NMAS) values; (3) within-laboratory variation of D R results increases with increasing NMAS for a given specimen geometry while the reproducibility of D R does not depend on the NMAS. Correspondingly, precision limits for both vnorm and D R were recommended and evaluated using a broad set of test results. }, journal={TRANSPORTATION RESEARCH RECORD}, author={Ding, Jing and Jeong, Jaehoon and Lee, Kangjin Caleb and Underwood, B. Shane and Kim, Youngsoo Richard and Castorena, Cassie}, year={2023}, month={Apr} }
 @article{jeong_underwood_kim_2022, title={Cracking performance predictions using index-volumetrics relationships with direct tension cyclic fatigue test and Illinois Flexibility Index Test (I-FIT)}, volume={315}, ISSN={["1879-0526"]}, DOI={10.1016/j.conbuildmat.2021.125631}, abstractNote={This paper introduces a methodology to predict fatigue cracking indices from asphalt mixture volumetric conditions using the index-volumetrics relationship (IVR). Two different tests, the Illinois Flexibility Index Test (I-FIT) and the direct tension cyclic fatigue test, were conducted using two North Carolina plant-mixed lab-compacted (PMLC) mixtures, RS9.5C and RI19.0C, obtained from field projects. Several mixture samples were collected from different truck loads for each mixture. The research team determined three sets of fatigue index values from the I-FIT, i.e., flexibility index (FI), cracking resistance index (CRI), and balanced cracking index (BCI) values, and determined another set of fatigue index values, Sapp index values, from the direct tension cyclic fatigue tests. IVRs for the individual mixtures and test indices were developed and then used to predict the fatigue index values at the volumetric properties that were not used in the IVR development. A good agreement was found between the predicted and measured index values. Except for the BCI values of the RS9.5C mixture, most of the I-FIT cracking test results showed counterintuitive trends with regard to air void content; however, the Sapp index showed more intuitive trends in both mixtures. The effect of binder content on the index values was not included in this study due to an inherent limitation of PMLC mixtures, which is the narrow range of binder content for the collected mixture samples compared to air void content.}, journal={CONSTRUCTION AND BUILDING MATERIALS}, author={Jeong, Jaehoon and Underwood, Shane and Kim, Y. Richard}, year={2022}, month={Jan} }
 @article{jeong_underwood_kim_2021, title={Rutting performance prediction using index-volumetrics relationships with stress sweep rutting test and Hamburg wheel-track test}, volume={295}, ISSN={["1879-0526"]}, url={https://doi.org/10.1016/j.conbuildmat.2021.123664}, DOI={10.1016/j.conbuildmat.2021.123664}, abstractNote={This paper describes a methodology to develop index-volumetrics relationships (IVRs) for rutting of asphalt mixtures. These relationships are developed from rutting performance test results and the volumetric properties (In-place VMA and In-place VFA) of the mixture at so-called 'four corners' of the volumetric space. Two rutting tests, the stress sweep rutting (SSR) test and Hamburg wheel-track (HWT) test, were employed to characterize the rutting performance of two mixtures acquired from two field projects. The IVRs for the individual mixtures and test methods were developed and used to predict the mixtures' rutting performance as a function of the two volumetric properties.}, journal={CONSTRUCTION AND BUILDING MATERIALS}, publisher={Elsevier BV}, author={Jeong, Jaehoon and Underwood, B. Shane and Kim, Y. Richard}, year={2021}, month={Aug} }
 @article{jeong_adams_kim_2020, title={Chip Seal Construction Variability and Its Impact on Performance}, volume={146}, ISSN={["2573-5438"]}, url={https://doi.org/10.1061/JPEODX.0000218}, DOI={10.1061/JPEODX.0000218}, abstractNote={AbstractThis paper presents findings obtained from field and laboratory tests that were designed to assess chip seal construction variability in comparison to the targeted design, and to investigat...}, number={4}, journal={JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS}, publisher={American Society of Civil Engineers (ASCE)}, author={Jeong, Jaehoon and Adams, Javon M. and Kim, Y. Richard}, year={2020}, month={Dec} }
 @article{wang_jeong_kim_2020, title={Comparison of Treatment Timing between Aggregate Base and Full-Depth Asphalt Roads}, volume={146}, ISSN={["2573-5438"]}, url={https://doi.org/10.1061/JPEODX.0000216}, DOI={10.1061/JPEODX.0000216}, abstractNote={AbstractAggregate base-course (ABC) pavements and full-depth asphalt (FDA) pavements are the two most commonly used types of asphalt pavements. During pavement design and pavement management, engin...}, number={4}, journal={JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS}, publisher={American Society of Civil Engineers (ASCE)}, author={Wang, Yizhuang David and Jeong, Jaehoon and Kim, Youngsoo Richard}, year={2020}, month={Dec} }