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Influence of Polyphosphoric Acid on Various Base Asphalt Performance

花匠小妙招
2024-11-08 10:18

在沥青路面的长期服役过程中,车辆荷载、气候侵蚀和环境劣化作用会造成沥青性能的降低,进而导致路面病害的产生。为提高沥青路面性能,改性沥青被广泛应用于道路建设中。针对传统聚合物改性沥青价格高、储存稳定性差,采用多聚磷酸(PPA)对沥青进行改性。相较于传统聚合物改性沥青,PPA改性沥青具有储存稳定性好、价格便宜及高温性能好等优点,但其对于不同基质沥青改性效果的差异较大,因此遴选6种国内常用基质沥青,通过软化点、延度及针入度试验、弯曲梁蠕变试验、动态剪切流变试验及Pull-off试验,研究了不同PPA改性沥青高低温性能及黏附性能。结果表明:PPA的掺入可显著提高沥青的软化点,随着PPA掺量的增加,沥青的延度及针入度逐渐降低,—18 ℃下劲度模量显著提高,表明PPA对沥青的低温性能存在显著的负面影响。温度扫描试验结果表明:PPA对不同基质沥青流变特性的影响有着较大的差异,PPA+70#沥青的流变性能总体高于PPA+90#沥青,但其温度敏感性较大。Pull-off试验表明:PPA的加入可显著提高沥青的拉拔强度,表明PPA改性沥青有着优异的黏附性能。红外光谱试验结果表明:PPA与不同基质沥青间的反应有着较大的差异。

Abstract

In the long service of asphalt pavement, heavy load, climate erosion and environmental degradation reduce asphalt performance, leading to the emergence of pavement disease. Therefore, in order to improve the performance of asphalt pavement, modified asphalt is widely used in road construction. The traditional polymer modified asphalt has disadvantages of high price and poor storage stability, therefore it is supposed to be modified with polyphosphoric acid (PPA). Compared with traditional polymer modified asphalt, PPA modified asphalt has the advantages of good compatibility, low price and excellent high temperature performance, however, the modification effect of PPA on different base asphalt varies greatly. Therefore, 6 types of commonly used domestic base asphalt are selected. The high and low temperature performance and adhesion properties of various PPA modified asphalt are studied by softening point, ductility and penetration test, bending beam rheometer test, temperature sweep test and pull-off test.The result shows that PPA addition can improve the softening point of asphalt significantly, with the increase of PPA content, the ductility and penetration of asphalt decrease gradually, and the stiffness modulus increases significantly at —18 ℃, indicating that PPA has a significant negative effect on the low temperature performance of asphalt.The result of temperature scanning test shows that the influences of PPA on the rheological properties of various base asphalt are quite different, asphalt PPA+70# has a generally higher rheological performance than that of asphalt PPA+90#, but its temperature sensitivity is greater. The result of Pull-off test shows that PPA addtion can improve the drawing strength of asphalt significantly, indicating that PPA modified asphalt has excellent adhesion property. The result of infrared spectrum test shows that the reactions of PPA with different asphalt are quite different.

关键词

道路工程 /沥青性能 /室内试验 /PPA改性沥青 /配伍性{{custom_keyword}} /

Key words

road engineering /asphalt performance /laboratory test /PPA modified asphalt /compatibility{{custom_keyword}} /

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