Performance evaluation of nanocellulose modified asphalt binder : its impact on rutting and fatigue resistance of asphalt binder | |
| Author | Manohar, Lakkapally |
| Call Number | AIT Thesis no.TE-17-09 |
| Subject(s) | Pavements, Asphalt--Additives--Evaluation Binders (Materials)--Evaluation Cellulose |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Transportation Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The objective of this study is to investigate the effect of cellulose nanofibers (CNF) additive on the rheological properties of asphalt binder. CNF were surface modified using silylation process for proper dispersion and compatibility with asphalt binder. In this study four CNFto-asphalt ratios were considered: 0.2%, 0.4%, 0.6%, and 0.8% by asphalt binder volume. The experimental tests such as rotational viscosity (RV), Dynamic Shear Rheometer (DSR) PG fail temperature test and Multiple Stress Creep Recovery (MSCR) test were conducted to evaluate the high temperature performance of CNF modified asphalt binder. RV test was conducted at 135°C temperature as specified by Superpave d at three rotational speeds: 20, 30, and 50 rpm. On the other hand, DSR fail temperature test was conducted on unaged samples and Rolling Thin Film Oven (RTFO)-aged at PG test temperatures ranging between 46°C-70°C and for Pressure Aging Vessel (PAV)-aged binders, PG test temperatures ranging between 19°C-31°C with a loading frequency of 10 rad/s (1.59 Hz) according to Superpave system. MSCR test was conducted on RTFO-aged samples binders at 64°C and 70°C temperatures. Fourier Transform Infrared spectroscopy (FTIR) test was conducted to obtain spectra of chemical groups that causes aging in asphalt binders. FTIR test is performed on unaged samples, RTFO-aged samples and PAV-aged samples to calculate the aging index of binders. Results showed that the addition of CNF to asphalt increased the RV at 135°C and different rotational speeds. CNF ratio had slight effect on the Newtonian behavior of binder. The DSR PG test results demonstrate that CNF addition to asphalt binder significantly improved the high temperature performance in terms of rutting resistance and intermediate temperature performance in terms of fatigue resistance. MSCR test results confirmed that the accumulated strain (γ) percent was decreased with the increase of CNF ratio in asphalt binder. The recovery percent (R%) and non-recoverable creep compliance (Jnr) values prove that the CNF addition improved the rutting resistance of asphalt binder at high temperatures. FTIR results shows that CNF in asphalt binder can improve the aging resistance. The chemical groups that causes aging in asphalt is found to be lower in CNF modified binder compared to those in control binder. |
| Year | 2018 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Transportation Engineering (TE) |
| Chairperson(s) | Kunnawee Kanitpong; |
| Examination Committee(s) | Hornyak, Gabriel Louis;Bora, Tanujjal;Surachet Pravinvongvuth; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2018 |