Laboratory Evaluating of Physical and rheological properties of modified bitumen Containing Crumb rubber and EVA

Document Type : Research Paper


1 Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.

2 Iran University of Science and technology


The use of waste materials, including plastics, to improve the properties of asphalt mixtures, in addition to economic benefits, has environmental benefits. Crumb rubber (CR) is one of these wastes that can improve many of the properties of asphalt mixtures, especially at low temperatures. But this additive also has weaknesses that can be compensated by making a double additive based on CR. In this study the influence of CR and EVA polymer on rheological and physical properties of unmodified bitumen has been studied and evaluated. To this aim, penetration, softening point, rotational viscosity and dynamic shear rheometer tests by using DSR machine were done on control bitumen and modified bitumen with a combination of 10 and 15% CR and EVA polymer based on the weight percentage of base bitumen (control) has been done with different ratios. The results of the dual combination of these additives with control bitumen show that the softening point and rotational viscosity increase and the degree of penetration decreases, which confirms the decrease in thermal sensitivity of the modified bitumen compared to the control bitumen. In addition, the results of the DSR Test also show that all modified bitumen have a larger complex shear modulus (G*) and a smaller phase angle(δ), and as a result have a larger sinusoidal coefficient (sin δ / G*) compared to the control bitumen. Besides, the fatigue coefficient caused by loading in the middle temperatures of all bitumen modified with dual compounds of these additives is smaller recommended. According to the findings of this study, the most appropriate dual combination of EVA additives and CR for improving the physical and rheological properties of base bitumen with a penetration rate of 60/70 is the use of dual combination of 25% EVA and 75% CR by proportion of 15 percent of bitumen.


ASTM D5. 2006. “Standard test method for penetration of bituminous materials”. ASTM International, West Conshohocken. USA.
Aflaki, S. and Tabatabaee, N. 2009. “Proposals for modification of Iranian bitumen to meet the climatic requirements of Iran”. Constr. Build. Mater., 23(6): 2141-2150.
Alataş, T. and Yilmaz, M. 2013. “Effects of different polymers on mechanical properties of bituminous binders and hot mixtures”. Constr. Build. Mater., 42: 161-167.
Ameri, M., Nemati, M., Shaker, H. and Jafari, F. 2019. “Experimental and numerical investigation of the properties of the hot mix asphalt concrete with basalt and glass fiber”. Frattura ed Integrità Strutturale, 50: 149-162.
Anderson, D. A., Christensen, D. W., Bahia, H. U., Dongre, R., Sharma, M. G., Antle, C. E. and Button, J. 1994. “Binder characterization and evaluation”. Volume 3: Physical characterization, Report No. SHRP-A-369, Strategic Highway Research Program, National Research Council.
Arabani, M., Tahami, S. A. and Hamedi, G. H. 2018. “Performance evaluation of dry process crumb rubber-modified asphalt mixtures with nanomaterial”. Road Mater. Pavement Design, 19(5): 1241-1258.
Farazmand, P., Hayati, P., Shaker, H. and Rezaei, S. 2020. “Relationship between microscopic analysis and quantitative and qualitative indicators of moisture susceptibility evaluation of warm-mix asphalt mixtures containing modifiers”. Frattura ed Integrità Strutturale, 51: 215-224.
Ghaempoor, A. and Tavakoli, A. 2013. “Study of rheological properties of EVA polymer modified bitumen”. First National Conference on New Technologies in Chemistry and Chemical Engineering, Tehran, Vista Scientific and Research Cooperative. (In Persian)
Gibreil, H. A. and Feng, C. P. 2017. “Effects of high-density polyethylene and crumb rubber powder as modifiers on properties of hot mix asphalt”. Constr. Build. Mater., 142: 101-108.
Habibi Karahrodi, M., Moini Jazani, O., Paran, S. M. R., Formela, K. and Saeb, M. R. 2017. “Modification of thermal and rheological characteristics of bitumen by waste PET/GTR blends”. Constr. Build. Mater., 134: 157-166.
Huang, Y. H. 2004. “Pavement analysis and design”. 2nd Edition, Pearson Publisher.
Liang, M., Ren, S., Fan, W., Xin, X., Shi, J. and Luo, H. 2017. “Rheological property and stability of polymer modified asphalt: Effect of various vinyl-acetate structures in EVA copolymers”. Constr. Build. Mater., 137: 367-380.
Padhan, R. K. and Gupta, A. A. 2018. “Preparation and evaluation of waste PET derived polyurethane polymer modified bitumen through in situ polymerization reaction”. Constr. Build. Mater., 158: 337-345.
Saoula, S., Mokhtar, K. A., Haddadi, S. and Ghorbel, E. 2009. “Improvement of the performances of modified bituminous concrete with EVA and EVA-waste”. Phys. Proced., 2(3): 1319-1326.
Stark, W. and Jaunich, M. 2011. “Investigation of ethylene/vinyl acetate copolymer (EVA) by thermal analysis DSC and DMA”. Polym. Testing, 30(2): 236-242.