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Properties of compositemodified asphalt with polyphosphoric acid and rubber powder(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年05期
Page:
9-17
Research Field:
道路工程
Publishing date:

Info

Title:
Properties of compositemodified asphalt with polyphosphoric acid and rubber powder
Author(s):
ZHOU Yuming1;  WEI Jianguo1;  SHI Song1; 2;  GAO Jianping1; DUAN Xiaojuan1;  CHENG Yi3
Keywords:
road engineering;  performance index;  dynamic shear rheology test;  compositemodified asphalt;  rubber powder;  polyphosphoric acid
PACS:
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DOI:
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Abstract:
In order to study the comprehensive performance of polyphosphoric acid (PPA) and rubber powder composite modified asphalt and its applicable conditions were investigated. Conventional and dynamic shear rheological tests were conducted, using indicators of the degree of targeting, softening point, ductility, penetration ratio, rutting factor，phase angle, and complex modulus index. Compositemodified asphalts with different contents of rubber powder PPA were studied. The high and lowtemperature performance, as well as the temperaturesensitive and aging properties, were evaluated in detail. The results show that the hightemperature performance of compositemodified asphalt is significantly improved, the softening point is higher, and the antirutting factor is approximately 5 to 20 times higher than that of the matrix asphalt. The deformation of asphalt is smaller under conditions of high temperature and large frequency, which is beneficial to the antirutting effect of asphalt，in a dynamic shear rheological test. The elastic property is better under a permissible speed, which is beneficial to the antirutting of pavements. However, the addition of PPA and rubber powder does not improve the ductility of the asphalt. The higher the amount of asphalt, the greater the decrease in its ductility. Further, the lowtemperature performance of the asphalt decreases. The slope of the complex modulus index (GTS) of the modified asphalt declines, indicating that the temperature sensing performance is improved. The blending of the PPA can upgrade the antirutting factor of asphalt aging, lowering the degree of phase angle increase. The hightemperature deformation resistance of asphalt modified with PPA and compound rubber powder is better than that using only modified rubber powder. Therefore, the incorporation of PPA can effectively improve the high and lowtemperature performance, as well as the temperaturesensitive and aging properties. Among the results, 1.5% PPA+15% rubber powder composite modified asphalt showed the best overall performance. 6 tabs, 10 figs, 25 refs.

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Last Update: 2018-10-23