Investigation of the effect of hydrated lime on low temperature cracking of asphalt concrete

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2019
Varlı Bingöl, Başa
The main objective of this study is to investigate the effect of hydrated lime on low-temperature cracking resistance of hot mix asphalt (HMA) mixtures. To this end, a comprehensive laboratory experimental program is established to evaluate the influence of hydrated lime modification, aggregate type, aggregate gradation and asphalt binder aging on temperature-related failure of HMA specimens. These specimens prepared from materials obtained from Turkish General Directorate of Highways are fabricated following the Superpave® method of mix design. Thermal stress restrained specimen tests (TSRST), direct tension tests (DTT) and indirect tensile tests (IDT) are performed to investigate the influence of hydrated lime modification as well as other mix design variables on the low temperature cracking resistance of HMA. Also, dynamic mechanical analysis (DMA), dynamic shear rheometer (DSR), and rotational viscosity (RV) tests are conducted to investigate the influence of HL on changing the rheological properties of asphalt binder. In addition to all the aforementioned tests, scanning electron microscopy (SEM) is conducted to observe the interaction of hydrated lime particles and asphalt binder at submicron levels. To develop robust conclusions, a few statistical analyses methods are utilized to identify the significant variables influencing the fracture strength and low temperature cracking of HMA; the resulting findings proved the significance of hydrated lime modification in increasing the fracture resistance of HMA when exposed to low temperatures.
Citation Formats
B. Varlı Bingöl, “Investigation of the effect of hydrated lime on low temperature cracking of asphalt concrete,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.