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- W4285384611 abstract "• This paper assesses the viability of using mineral fillers from industrial by-products. • Lime kiln dust and dolomite powder were studied and compared to cement powder. • Changes in asphalt binder phases occur as a result of asphalt-filler interactions. • The pH conditions dictate mastics adhesive tendencies due to electrostatic ionic exchange. • Thus, impacting pull-off strengths within asphalt-aggregate interfaces. The influence of filler particle mineralogy, pH and electrostatic charge on the adhesive tensile strength and morphological structure of asphalt mastic composites were assessed in this study. Three different fillers i.e., dolomite powder (DP), lime kiln dust (LKD), and ordinary Portland cement (OPC) together with a conventional PEN 60/70 binder were used for the asphalt mastic preparation. The mastics were mixed at dosages of (0.4, 0.8, and 1.2) filler to binder concentration (F/B) by volume as per the dust to binder specifications of Superpave mix designs. OPC mastic was utilised as the control mastic sample for all conducted tests, while the DP and LKD mastics were tested as sustainable alternatives to the OPC. The impact of filler inclusions in asphalt liquid phases was investigated via optical microscope assessments. Similarly, physicochemical tests of the elemental and mineralogical composition of each filler were accounted for using x-ray diffraction tests. The surface charge characteristics of each test filler was analysed relative to its mastic pH conditions through the application of zeta potential tests. Adhesive pull-off tensile strengths of the mastics on granite and limestone interfaces were also assessed for both dry and moisture conditions. The incorporation of fillers in asphalt binders highlighted the effect of filler reactivity and inert tendency on binders’ morphological phase modification wherein the OPC and LKD were reactive with the asphaltene while the DP was less reactive and inert. Results obtained from both the x-ray diffraction and zeta potential tests also infer the calcium based OPC and LKD to exhibit better surface ionic attraction compatibility with the PEN 60/70 binder than the DP at high F/B. Meanwhile, the relationship between the filler surface charge and mastic pH condition was observed to be significant and reliant upon the mastics adhesive pull-off tensile characteristics." @default.
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- W4285384611 date "2022-09-01" @default.
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- W4285384611 title "Relationship between the physicochemical and electrostatic charge characteristics of filler materials on the morphological and adhesive Pull-Off tensile strength of asphalt mastics" @default.
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- W4285384611 doi "https://doi.org/10.1016/j.conbuildmat.2022.128343" @default.
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