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Research on Performance of SBS-PPA and SBR-PPA Compound Modified Asphalts
Authors:Jianguo Wei  Song Shi  Yuming Zhou  Zhiyuan Chen  Fan Yu  Zhuyi Peng  Xurui Duan
Affiliation:1.School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410004, China; (J.W.); (S.S.); (Z.C.); (F.Y.); (Z.P.); (X.D.);2.Henan Railway Construction & Investment Group Co., Ltd., Zhengzhou 450018, China;3.National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science and Technology, Changsha 410004, China
Abstract:Although several studies indicated that the addition of Styrene-Butadiene-Styrene (SBS) and Styrene-Butadiene Rubber (SBR) bring a lot of benefits on properties of asphalt binders, high production costs and poor storage stability confine the manufacture of better modified asphalt. To reduce the production costs, polyphosphoric acid (PPA) was applied to prepare better compound modified asphalt binders. In this research, five PPA (0.5%, 0.75%, 1.0%, 1.25% and 1.5%) and two SBR/SBS (4% and 6%) concentrations were selected. Dynamic shear rheometer (DSR) and Bending Beam Rheometer (BBR) tests were performed to evaluate the rheological properties of the compound modified asphalt. Rolling Thin Film Oven (RTFO) test was performed to evaluate the aging properties of the compound modified asphalts. The results indicate that SBS/SBR modified asphalts with the addition of PPA show better high-temperature properties significantly, the ability of asphalt to resist rutting is improved, and the elastic recovery is increased. However, the low-temperature properties of the compound modified asphalts are degraded by increasing the creep stiffness (S) and decreasing the creep rate (m). At the same time, RTFO tests results show that PPA was less prone to oxidation to improve the anti-aging ability of modified asphalts. Overall, the combination of 4% SBS and 0.75–1.0% PPA, the combination of 4% SBR and 0.5–0.75% PPA is recommended based on a comprehensive analysis of the performance of compound modified asphalt, respectively, which can be equivalent to 6% SBS/SBR modified asphalt with high-temperature properties, low-temperature properties, temperature sensitivity and aging properties.
Keywords:road engineering   polyphosphoric acid   dynamic shear rheological test   temperature sensing performance   aging performance
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