| Author: | Guo, Jing |
| Title: | Preparation and characterization of glycerol-montmorillonoid modified asphalt rubber mixture |
| Advisors: | Leng, Z (CEE) |
| Degree: | M.Sc. |
| Year: | 2016 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Asphalt concrete Pavements, Asphalt concrete -- Materials |
| Department: | Faculty of Construction and Environment |
| Pages: | xv, 76 pages : color illustrations |
| Language: | English |
| Abstract: | It is an accepted fact that the rubber modified hot mix asphalt (AR) is a kind of excellent pavement material, and it has superior mechanical performance and lower traffic noise and maintenance than the conventional asphalt pavement. However, poor workability and storage stability are the two main deficiencies that limit a wider application of AR. New concept of glycerol-montmorillonite solution (G-M) is introduced in this thesis, in which the glycerol solution could improve the workability and the montmorillonites (Nanoclays) could improve the storage stability. Meanwhile, the G-M solution could also be easily added into AR and it could also be regarded as a dispersion medium for the Nanoclays. Until now, there has been no research studied on the mechanical performance of the G-M solutions modified AR. Hence, the point of this thesis is studying on the mechanical performance of G-M modified AR under the improved workability condition. Four groups of asphalt mixtures are made, including two G-M solution modified AR, the pure Na+ montmorillonite (NCL) and the organic modified montmorillonite (DK-4), and as well as two control groups, the AR group and the commercial Evortherm-DAT modified warm mix asphalt (Evortherm-DAT). Meanwhile, the rotational viscosity tests of G-M solutions modified AR binder is conducted for determining the mixing and compaction temperature and for making the comparison of workability improvement of glycerol solution and commercial Evotherm-DAT. For the mechanical performance of asphalt mixtures, the indirect tension strength (ITS) tests, indirect tensile stiffness modulus (ITSM) tests, and dynamic modulus (DM) tests are conducted. The workability of NCL and DK-4 binders has been improved comparing with the AR binder. The viscosities of NCL and DK-4 are lower than AR at the test temperature of 160ºC. However, the softening points decreased and penetration increased, which means the NCL and DK-4 groups not able to improve the high temperature stability. In terms of the ITS test results, the NCL and DK-4 have both increased tensile strength of asphalt mixtures, and DK-4 is superior to NCL under dry condition. However, the tensile strength ratio (TSR) of NCL and DK-4decreased under wet condition, which means the NCL and DK-4 have positive effect on mechanical properties. But the glycerol solution has negative effect after saturation and freeze-thawing processes. As for the ITSM test results, the stiffness modulus of NCL and DK-4 is nearly half of AR, both on the non-aged and aged conditions. However, the modulus increment of NCL and DK-4 is lower than AR and Evortherm-DAT, which means, the glycerol solutions have a considerable negative effect on stiffness modulus, as from most of the researches, Nanoclays have positive correlation with stiffness modulus. In addition, the G-M solutions improved anti-aging performance of AR, because of the diminishing increments after aging treatment. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991021959951303411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.17 MB | Adobe PDF | View/Open |
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