Recycled packaging-waste polyethylene (WPE) was used to replace the ordinary polymer modifier in the modification of raw asphalt, and the pavement properties of the modified asphalt were studied. The high-temperature stability, anticracking properties at low temperature, life span, and stability against water of the asphalt mixture were improved, a finding which is attributed to the properties and characteristics of WPE, the swelling of sheared WPE, and the WPE/ asphalt network structure. The use of packaging WPE can improve the pavement properties of asphalt, as well as save resources and reduce white pollution. J. VINYL ADDIT. TECHNOL., 20:31-35, 2014.
UDC 546.281:541.182 Nanosized WC/MgO powders are synthesized by high-energy ball milling the mixture of WO 3 , C, and Mg elements in an atomic ratio of 1:1:3 under argon gas atmosphere at room temperature, and the composite is made by plasma-activated sintering. The microstructure of the mixture powders produced by ball milling and the sample consolidated by plasma-activated sintering is investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It is indicated that self-propagating reduction reactions occur between the mixed element powders during high-energy ball milling, leading to the formation of nanosized WC/MgO crystalline particles with an average size of 35 nm after ball milling for 5h. The obtained nanosized WC/MgO powders are consolidated by plasma-activated sintering at 1473K under the pressure in a range of 5 to 7.5 kN for 1.05 ksec, and then WC/MgO composite with nanomicrostructure and full density can be obtained. The WC/MgO composite exhibits high hardness and high fracture toughness in comparison with commercial WC/Co composites.
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