Physical and Rheological Properties of Asphalts Modified with Polyethylene-co-methylacrylate and Acids
คำสำคัญ:
modified asphalts, polyethylene-co-methylacrylate, phosphoric acid, polyphosphoric acid, citric acidบทคัดย่อ
Polymer-modified asphalts are prepared by mixing various amounts of polyethylene-co-methylacrylate (2-8 wt%) and polyphosphoric acid (1-3 wt%) in asphalt (60/70 penetration grade) at 170๐C for 2 h. The Physical and rheological properties were investigated and compared with the reference asphalt, modified with 4 wt% SBS, styrene butadiene styrene polymer (elastomer). The strength and compatibility of the modified asphalts were increased, demonstrated by the increase of softening point and the decrease in penetration value. The temperature susceptibility was decreased and storage stability was improved. The elastic recovery and complex modulus were increased, indicating the resistance in deformation. The asphalt mixtures containing 4% copolymer and 1% polyphosphoric acid were found to have a the good performance, showing a 12% increase in strength and a 28% increase in compatibility, compared to the reference asphalt. The effects of type (polyphosphoric acid, phosphoric acid or citric acid.) and concentration (1-3 wt%) of acid were studied with asphalt containing 4 wt% polyethylene-co-methylacrylate. The efficiency of acid in improving asphalt’s properties are: polyphosphoric acid > phosphoric acid > citric acid.
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ลิขสิทธิ์ (c) 2005 The Journal of Metals, Materials and Minerals (JMMM)
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