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摘要
将废旧聚乙烯(PE)作为改性剂应用于沥青路面工程是处理废旧PE最合理有效的途径之一,但废旧PE与沥青的相容性不足阻碍其推广应用。以废旧PE塑料、多聚磷酸(PPA)为改性剂制备废旧PE/PPA复合改性沥青,研究了不同掺量PPA对废旧PE改性沥青相容性、流变性能、粘附性能、抗浸水能力及其混合料路用性能的影响。结果表明:PPA能够促进废旧PE在沥青中均匀分散,提高废旧PE与沥青的相容性;随着PPA掺量的增加,复合改性沥青针入度、延度降低,软化点和黏度明显升高;动态剪切流变试验证明了PPA能够提高复合改性沥青高温弹性恢复率、中低温抗疲劳性能;随着PPA掺量的增加,复合改性沥青拉拔强度和抗浸水能力逐渐增强。混合料路用性能研究表明,PPA能够显著地提高复合改性混合料的抗车辙性能、耐疲劳性能、水稳定性,同时胶结料抗浸水能力与混合料水稳定性有较好的线性相关性;但PPA对混合料低温性能有一定的负面影响。因此在低温高寒地区使用时,必须严格控制PPA的掺量。
Abstract
The application of waste polyethylene (PE) as modifier in asphalt pavement engineering is one of the most reasonable and effective ways to treat waste PE,but the lack of compatibility between waste PE and asphalt hinders its popularization and application.Waste PE/PPA composite modified asphalt was prepared with waste PE plastic and polyphosphoric acid (PPA) as modifier.The effects of different content of PPA on compatibility,rheological properties,adhesion,water immersion resistance and pavement performance of the asphalt were studied.The segregation test and fluorescence microanalysis shown that PPA can promote the uniform dispersion of waste PE in asphalt,and improved the compatibility between waste PE and asphalt.With the increase of PPA content,the penetration and ductility of the asphalt decreased,and the softening point and viscosity increased obviously.The dynamic shear rheological test shown that PPA can improve the high-temperature elastic recovery rate and the middle-low temperature fatigue resistance of the asphalt.With the increase of PPA content,the pull-out strength and water immersion resistance of the asphalt increased gradually.The research on the pavement performance of the mixture shown that PPA can significantly improve the rutting resistance,fatigue resistance and water stability of the mixture,and there was good linear correlation between the water immersion resistance of the binder and the water stability of the mixture.However,PPA had a negative effect on the low temperature performance of the mixture.Therefore,when it was used in the low-temperature and high cold area,it was necessary to strictly control the content of PPA.
关键词
废旧聚乙烯塑料
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多聚磷酸
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相容性
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混合料
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路用性能
Key words
waste PE plastic
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polyphosphoric acid
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compatibility
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mixture
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pavement performance
PPA对废旧塑料改性沥青及其混合料路用性能影响研究[J].
化工新型材料, 2022, 50(7): 229-234 DOI:10.19817/j.cnki.issn1006-3536.2022.07.047
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基金资助
广西重点研发计划(桂科AB19245019);南宁市科学技术研究与技术开发计划(20193129)
