03372nam a2200409 a 4500 20260818144346.0 240116s2020 th ad rm 000 0 eng d .b12416642 AIT Diss no.TE-19-01 Nawapol Brahmajaree Investigation of the internal structural properties of asphalt mixtures subjected to loading using image analysis Pathum Thani, Thailand : Asian Institute of Technology, 2020 100 leaves : ill. Dissertation ; no. TE-19-01 A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Transportation Engineering Thesis (Ph.D.) - Asian Institute of Technology, 2020 Asphalt concrete is a heterogeneous material consisting of asphalt binder, aggregates, and air voids; spatial distributions and interactions of these components affect the performance of the material past decades, increasing interest has been shown in the use of image analysis techniques for characterizing the internal structure and performance of asphalt mixtures; however, the influence of load applications is still lacking. In this study, a 2-D imaging analysis was used to evaluate the changes in asphalt concrete microstructure due to loading of lab-made specimens and field-core specimens. Uniaxial compression tests were conducted to apply different loading levels to the lab-made specimens, while field-core specimens were subjected to different levels of accumulated traffic load. Results indicate that mixture microstructural properties, including number of aggregate contacts, total contact length, and internal structure index (ISI), significantly decreased with increased strain levels resulting from increased loading levels, whereas average contact orientation and vector magnitude did not change significantly with deformation. Relationships between ISIs and loading levels were plotted and their slopes were determined for all lab-made asphalt mixes. Results suggest that under a given load application, the performance grade of asphalt binder is a critical factor influencing the rutting performance of asphalt mixture. Asphalt concrete Asphalt Mixing Kunnawee Kanitpong, Chairperson Santoso, Djoen San, Examination Committee Auckpath Sawangsuriya, Examination committee Department of Highways, Thailand, Scholarship Donor Asian Institute of Technology. Dissertation ; no. TE-19-01 .b12416642 multi y 240702 0 240620 m a y 0 mnait mnait mnarc 40 20 Barcode : 30050121038284 CREATED : 2024-01-16 RECORD # : i13477365 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121066681 CREATED : 2024-05-02 RECORD # : i13482373 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121066376 CREATED : 2024-02-19 RECORD # : i13485519 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 64821 64821 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Diss no.TE-19-01 30050121038284 2026-08-18 14:43:46 1 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Diss no.TE-19-01 30050121066681 2026-08-18 14:43:46 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Diss no.TE-19-01 30050121066376 2026-08-18 14:43:46 2 2026-08-18 20