United States Department of Transportation
i
Determination of significant factors controlling compatibility of asphalt with synthetic polymers : final report.
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1995-06-01
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[PDF-2.06 MB]
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Alternative Title:Determination of significant factors controlling compatibility of asphalt with synthetic polymers.
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Abstract:The primary objective of this work is to evaluate several significant factors controlling compatibility between asphalt and synthetic polymers. Employing nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), dynamic mechanical spectrometry (DMS) and thermomechanical analysis (TMA) techniques, we have determined the composition and crystallinity of representative asphalts along with their dynamic physical properties. Eight asphalt samples from four manufacturers with grades from AC-10 to AC-30 were characterized by penetration, viscosity, temperature sensitivity, Carbon-13 NMR, FTIR, dynamic mechanical analysis (DMA) and DSC. Glass transition temperatures and activation energies for the relaxation process of the asphalt were determined with DMA experiments. The crystallizable component of the asphalt was measured with DSC, and polar groups in the asphalt were analyzed with FTIR.
Techniques for slightly chlorinating polyethylene to improve its compatibility with asphalt are reported. Both high density polyethylene (HDPE) and chlorinated polyethylene (CPE) modified asphalts containing 5 wt% polymer were studied using classical techniques and DMA in both bending mode and shear mode. DSC, fluorescence reflection microscopy and FTIR were also employed to characterize the polymer modified asphalts. Penetration, viscosity, creep resistance and low temperature crack resistance of the asphalt and the polymer modified asphalts were evaluated. The results confirm that CPEs with low chlorine contents (<15 wt%) are more compatible with asphalt than HDPE and, therefore, exhibit better reinforcement effects in asphalt cements. Constant stress creep and 50 Hz dynamic crack resistance are excellent tests for determining polymer-asphalt compatibility.
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