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再生礦物填充料類型與含量對密級配熱拌瀝青混凝土力學特性之影響

為了解決Water ladle的問題，作者Tarekegn Kumala Sherre 這樣論述：

Investigation of recycled waste materials as a replacement of conventional filler is one alternative problem solving mechanism in hot mix asphalt (HMA). This study was designed to analyze the characteristics of two recycled fillers called hollow concrete block (HCB) powder and brick powder (BP), to

assess impacts of filler type and content on the mechanical and cracking properties of hot mix asphalt (HMA) at 3%, 5% and 7% as a full replacements for limestone (LS) filler. The recycled materials and limestone fillers obtained from construction and demolition wastes (CDW) site, and naturally min

ed for commercial uses, respectively. Filler characteristics were examined using different cutting-edge technologies, such as laser diffraction particle size analysis (LDS), Fourier transform infrared (FTIR), Brunauer, Emmette, and Teller method (BET), X-ray diffractometer (XRD), scanning electron m

icroscope (SEM) and energy dispersive x-ray spectroscopy (EDS). Rotational viscosity and dynamic rheological properties of asphalt mastic with recycled filler over a wide range of frequencies and temperatures have shown better values than the conventional filler. The respective effects of the recycl

ed fillers and the mechanical properties of the HMA mixtures were assessed by investigating superpave volumetric analysis, indirect tensile strength (ITS), moisture damage by tensile strength ratio (TSR), permanent deformation and indirect tensile cracking indices (IDTindex) tests. The analysis of t

he volumetric properties revealed that the 5% of each fillers content was considered as an optimum filler content in the mixtures among the three fillers percentages (3%, 5% and 7%). Thus, the mechanical properties had investigated at the optimum 5%, except for IDT crack tests that used three differ

ent % of fillers. The results demonstrated that mixture with the HCB powder recorded a 6% higher TSR value than the LS mixture and 7.2% higher TSR value than the BP mixture. Mixtures with the HCB powder significantly improved the moisture, rutting, and cracking resistance of the HMA, which are fact

ors critical to extend the life of asphalt concrete. In contrast, using BP results in mixed values and negative effects particularly in terms of moisture resistance and rutting. The filler concentrations had also significant effect on the cracking performance of the asphalt. Peak loads and fracture

energy were increased as filler percentages were increased from 3%, 5% to 7% while the cracking indices such as cracking tolerance index (CT-index), flexibility index (FI), fractural energy index (FEI), toughness index (TI), crack resistance index (CRI), and fracture strain tolerance ( FST) were gov

erned at the 5% filler concentration. Strong linear correlations were observed for the R2 values of 0.89, 0.85, 0.84 and 0.68 for the CT index, FI, FEI, and TI, respectively, while a moderate correlation with 0.52 R2 for CRI and a weak correlation with 0.44 R2 for FST were observed between both spec

imen diameters. Therefore, both of the specimen diameters examined in this study (100mm and 150mm) may use interchangeably to characterize the crack performance of HMA using the IDT test due to the test results found and discriminated low variability of cracking indices.