Study on the Rheological Properties of Formic Acid Lignin Modified Asphalt

Lignin is a major waste product of biofuel and paper industries that can be used as modifier to improve the relevant properties asphalt. To investigate effect lignin formic acid wood incorporations into asphalt on binder was unaged aged for 85 min, 5 h, 10 series tests were conducted, including high- low-temperature rheological by dynamic shear rheometer (DSR), followed Fourier transform infrared spectroscopy (FTIR) tests, finally gel permeation chromatography (GPC). The test results show additions could high-temperature performance fatigue capacity In addition, at glass-transition temperature, it observed effectively cracking low temperatures; however, quantity should controlled. showed purity treated with decreased, degradation formylation same acid-treated occurred, indicating underwent chemical changes following treatment. analysis (GPC) that, aging, average molecular weight (Mw) lignin-modified decreased. reason cracked during which reduced their weights.