为考察聚乙烯蜡(PEW)对沥青的温拌规律,并推断作用机理,将两种不同熔点的废旧PEW-1(熔点95℃)和PEW-2(熔点105℃)以不同的掺量分别加入到基质沥青制得两种蜡改性沥青,采用针入度、软化点和延度探究了PEW改性沥青的常规性能,利用布氏黏度(CV)研究评价了PEW改性沥青的温拌效果;应用动态剪切流变(DSR)和短期薄膜老化(RTFOT)研究了PEW改性沥青老化前后的高温流变性能;借助傅里叶红外光谱研究推测了PEW与基质沥青主要发生的物理反应;通过热重-差热研究分析了PEW熔点对基质沥青的微观影响。结果表明,加入PEW后,沥青黏度下降,高温性能提升,其中PEW-1最佳掺量为5%,PEW-2为6%,老化后改性沥青的高温性能进一步提升,PEW-1的降粘和高温提升效果都好于PEW-2。红外光谱结果证明PEW与沥青之间未发生化学反应,两者为物理共混。热重-差热试验表明PEW的熔点可以影响改性沥青在熔程温度范围内的物态变化,进而影响温度敏感性。
In order to investigate the warm mixing law of polyethylene (PE) wax on asphalt and infer the action mechanism,two waste PE waxes with different melting points,PEW-1 (melting point:95℃) and PEW-2 (melting point:105℃),were added by different dosages in the base asphalt.Two kinds of PE wax-modified asphalt were prepared.The conventional properties of the modified asphalt were explored using penetration,softening point and ductility.Brookfield viscosity (CV) test was used to evaluate PE.Warm mixing effect of the asphalt,dynamic shear rheology (DSR) and short-term film aging (RTFOT) tests were used to study the high-temperature rheological properties of the asphalt before and after aging.With the help of fourier infrared spectroscopy (FT-IR),the main physical reaction between PE wax and base asphalt was inferred.Thermogravimetric-differential thermal (DSC) test was used to analyze the microscopic effect of the melting point of PE wax on the base asphalt.Studies shown that after adding PE wax,the viscosity of the asphalt decreased,and improved the high temperature performance.The best content of PEW-1 was 5% and PEW-2 was 6%.After aging,the high temperature performance of the asphalt was further improved.The viscosity reduction and high temperature improvement effects of PEW-2 were better than those of PEW-2.The infrared results proved that there was no chemical reaction between the PE wax and the asphalt,and the two were physically blended.The thermogravimetric-differential thermal test shown that the melting point of PE wax can affect the change of the state of the asphalt within the melting range temperature range,thereby affecting the temperature sensitivity.
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基金资助
中国博士后面上项目(2015M572643XB);重庆市科委基础科学与前沿技术研究项目(cstc2017jcyjAX0310);广西道路结构与材料重点实验室开放课题(2017gxjgclkf-002)
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