多聚磷酸改性沥青结合料高温流变性能

发布时间：2018-02-20 17:27

本文关键词： 多聚磷酸流变性能改性沥青 PG等级　出处：《建筑材料学报》2017年03期 　论文类型：期刊论文

【摘要】：通过沥青针入度、软化点、延度、四组分试验和动态剪切流变(DSR)试验,研究多聚磷酸(PPA)改性沥青结合料的高温流变性能,并与基质沥青和SBS改性沥青结合料进行对比.结果表明:PPA的掺入使沥青结合料高温流变性能指标明显改善,随PPA掺量的增加,沥青结合料软化点升高,针入度降低,复数剪切模量增大,相位角减小,车辙因子增大,说明PPA的掺入使沥青结合料高温性能得到提高;DSR试验证明,可以用1.0%(质量分数,下同)PPA代替4.0%SBS来改善沥青结合料的高温性能,并且PPA掺量几乎每增加0.5%,高温PG等级就提高1个等级.PPA的掺入使结合料中沥青质含量明显增加,胶质含量明显减少,采用PPA作为改性剂可以提高沥青结合料的高温抵抗变形能力.
[Abstract]:The rheological properties of asphalt binder modified by polyphosphate (PPA) at high temperature were studied by penetration, softening point, ductility, four-component test and dynamic shear rheological test. Compared with matrix asphalt and SBS modified asphalt binder, the results showed that the rheological properties of asphalt binder at high temperature were obviously improved with the addition of PPA. With the increase of PPA content, the softening point of asphalt binder increased and the penetration degree decreased. The increase of complex shear modulus, the decrease of phase angle and the increase of rutting factor indicate that the high temperature properties of bituminous binders can be improved by adding PPA. It is proved that 1.0 (mass fraction) can be used to improve the high temperature properties of bituminous binders instead of 4.0. With the addition of PPA, the content of asphaltene and the content of colloid in the binder were obviously increased and the content of colloid was obviously decreased, and the PG grade of high temperature was increased by one grade, and the content of asphaltene in the binder was obviously increased. Using PPA as modifier can improve the deformation resistance of asphalt binder at high temperature.
【作者单位】：内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金资助项目(11462018) 内蒙古自治区自然科学基金资助项目(2015MS0539) 内蒙古自治区交通运输厅建设科技项目(NJ201421)
【分类号】：U414

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