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通过5℃延度试验、25℃针入度试验和小梁弯曲蠕变试验(BBR),研究了不同种类的PPA改性沥青和PPA复配改性沥青(PPA+SBS、TB+PPA+SBS)的低温性能,最后结合PG低温分级和经济性因素对上述改性沥青进行了综合评价。结果表明:PPA掺量的增加有利于提高埃索沥青的低温性能,PPA对伊朗70#沥青的低温性能是有损害的,PPA对沥青胶结料的改性结果与沥青的化学组分有很大的关系;PG分级显示,随着PPA掺量的增加,PPA+SBS复合沥青的低温性能先升高再降低,从5℃延度值来看,PPA的增加对PPA+SBS的低温性能是不利的;对于TB+SBS+PPA复合沥青,从软化点变化来看PPA的加入有利于提高复合沥青的高温性能,总体上PPA对PPA+SBS以及TB+PPA+SBS的低温性能影响较小,其低温性能主要是由TB胶粉和SBS掺量决定;TB胶粉可以明显提升PPA复配改性沥青低温性能,且能在一定程度上降低复合改性沥青的生产成本。
The effects of PPA modified bitumen and PPA modified bitumen (PPA + SBS, TB + PPA + SBS) were studied by means of 5 ° C ductility test, 25 ° C penetration test and trabecular bending creep test (BBR) ) Low temperature performance, combined with PG low temperature grading and economic factors of the above-mentioned modified asphalt comprehensive evaluation. The results show that the increase of PPA content is beneficial to improve the low temperature performance of Esso asphalt, PPA is detrimental to the low temperature performance of Iranian 70 # asphalt, and the modification result of PPA to asphalt cement material is very large with the chemical composition of asphalt PG grade shows that with the increase of PPA content, the low temperature performance of PPA + SBS composite asphalt firstly increases and then decreases. From the ductility of 5 ℃, the increase of PPA is unfavorable to the low temperature performance of PPA + SBS Of PPT + PPA + bitumen, the addition of PPA from the point of softening point is helpful to improve the high temperature performance of composite bitumen. Generally speaking, PPA has little effect on the low temperature performance of PPA + SBS and TB + PPA + SBS, The low temperature performance is mainly determined by the dosage of TB rubber powder and SBS. The TB rubber powder can obviously improve the low temperature performance of the PPA compound modified asphalt and can reduce the production cost of the composite modified asphalt to a certain extent.