Evaluation of the Performance of Asphalt Binder Modified With Nanoparticles
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 1, Issue 1
Abstract
The physical and rheological properties of asphalt binder have been characterized using the conventional tests; (penetration, ductility, and softening point) and dynamic shear rheometer (DSR). In this study, Calcium Carbonate nanoparticles (CaCO3) and Aluminum hydro oxide (Al2O3) nanoparticles have been added to the base asphalt with a concentration of 3, 5 and 7% by the weight of asphalt. It was found that the addition of CaCO3 and Al2O3 content has a significant effect on the physical properties of the asphalt, as the penetration reduced up to 50% for modified asphalt with CaCO3 and 64% for modified asphalt with Al2O3. The softening point of modified asphalt binders was increased up to 11 and 12% for both modifiers respectively compared with the base asphalt binder. Also, the results showed that the storage stability of modified asphalt binders with CaCO3 and Al2O3 nanoparticles was less than 2.5 °C, which indicates that the asphalt binder and the modifiers having great compatibility. The evaluation of the complex shear modulus of modified asphalt binders shows that the stiffness (G*) was increased with addition increase of both modifiers, and the best performance of asphalt binder was found with the addition of 5% of both nanoparticles. As a result, the use of CaCO3 and Al2O3 nanoparticles can be considered a suitable alternative additive to modify asphalt binder. Asphalt is a dark brown to black cementation material in which the predominating constituents are bitumen, which occurs in nature or is obtained in petroleum processing. Asphalts are viscous liquids or solids essentially consisting of hydrocarbons and their derivatives, which soluble in carbon disulfide [1,2]. They are substantially nonvolatile at ambient temperature and soften gradually when heated. Asphalt has been used for thousands of years, and it is important as a valued engineering material continues to increase. Bitumen has been widely used in the construction of highways and road network, so in that way, asphalt should resist stresses due to traffic loads and low temperature [3]. Due to the limitation of temperature susceptibility, the low, intermediate and high temperatures and temperature performance of the asphalt need to be enhanced. Therefore, modification of base asphalt is necessary to improve the performance of material [4-6]. There are several types of asphalt modifiers, including rubbers, sulfur, polymers, fibers, and nano materials [4,7,8]. Recently, nanotechnology has rapidly been incorporated into the field of asphalt binder with different kinds of nanomaterials being used to modify asphalt and asphalt mixes. It found that nano materials can enhance the performance of asphalt binder and mixture. A study conducted by You et al. Found that nanoclay modified asphalt could reduce the strain failure rate and increase the stiffness (shear complex modulus) of base asphalt [8,9]. Also, using single-wall nano tube materials (SWNT) to modify the asphalt binder, show that the performance grade of the modified asphalt binders increased. Also, the elastic element of complex modulus of the base asphalt was less than the modified asphalts [10]. Based on the study presented by Hui Yao et al. using nano silica to modify asphalt, they found that the addition of nano silica decreases the viscosity rates of unmodified asphalt slightly. Lower and higher viscosity values of asphalt have an influential role in determining the mixing and compaction temperatures. Moreover the addition of nano silica able to reduced and delayed the aging process [11].
Authors and Affiliations
Shaban Ismael Albrka
Keywords
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- EP ID EP604413
- DOI 10.32474/TCEIA.2018.01.000104
- Views 78
- Downloads 0
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