交通运输研究2023，Vol.9Issue(6)：99-106,8.DOI:10.16503/j.cnki.2095-9931.2023.06.010
多聚磷酸/天然胶乳(PPA/NRL)复合改性沥青流变特性
Rheological Properties of PPA(Polyphosphoric Acid)/NRL(Natural Rubber Latex)Composite Modified Asphalt
摘要
Abstract
In order to improve the high temperature performance of NRL(Natural Rubber Latex)mod-ified asphalt,PPA/NRL composite modified asphalt with different content of PPA(Polyphosphoric Ac-id)was prepared based on the synergistic mechanism of PPA.The viscoelastic properties,high temper-ature properties,low temperature properties,fatigue properties and workability of modified asphalt were analyzed.On the one hand,by using the dynamic shear rheometer and bending beam rheometer,temperature scanning,time scanning,frequency scanning and stiffness modulus tests were conducted to analyze the variation pattern of complex shear modulus G*,phase angle δ and rutting factor G*/sinδ with the change of temperature and time.The fatigue performance of PPA/NRL composite modified as-phalt was characterized by the corresponding loading times when the complex shear modulus de-creased to 50%of the initial value.The low-temperature performance of PPA/NRL composite modi-fied asphalt was characterized by the ratio of m value to creep stiffness modulus S.On the other hand,the viscosity of PPA/NRL composite modified asphalt was tested by Brookfield viscometer to evaluate its workability.The test results show that with the increase of PPA content,the rutting factor value in-creases,which means that the high-temperature performance of asphalt is improved.The linear rela-tionship between the logarithm of rutting factor and temperature proves that the increase of PPA con-tent also helps to improve the temperature sensitivity of PPA/NRL composite modified asphalt.In addi-tion,the fatigue life gradually improves with the increase of PPA content.The addition of PPA will re-duce the low-temperature performance of PPA/NRL composite modified asphalt.The viscosity of PPA/NRL composite modified asphalt increases with the increase of the content of PPA.In order to ensure its workability,the content of PPA should not exceed 1.1%.The research shows that the use of poly-phosphoric acid as the composite material of natural rubber latex is an effective way to realize the road use of natural rubber latex,and only a small amount of PPA can endow better pavement performance to modified asphalt.关键词
道路工程/天然胶乳/多聚磷酸/改性沥青/复配改性/流变特性/布氏黏度Key words
pavement engineering/natural rubber latex/polyphosphoric acid/modified asphalt/composite modification/rheological properties/Brookfield viscosity分类
交通工程引用本文复制引用
马前程,李亚非,杨晨..多聚磷酸/天然胶乳(PPA/NRL)复合改性沥青流变特性[J].交通运输研究,2023,9(6):99-106,8.基金项目
中央级公益性科研院所基本科研业务费项目(20217502) （20217502）
