Investigating the Effects of Nanoclay and Nylon Fibers on the Mechanical Properties of Asphalt Concrete

Document Type: Research Papers


assistant professor, civil engineering department, university of zanjan, zanjan, Iran


This paper describes the effects of reinforcement by randomly distributed nylon fibers and addition of nanoclay on some engineering properties of a typical asphalt concrete. The properties of asphalt concrete reinforced by different percentages of 25 mm nylon fibers have been compared with those of the mixtures containing different percentages of nanoclay and those in which both the fibers and nanoclay have been included. Engineering properties, including Marshall stability, resilient modulus, dynamic creep and fatigue life have been studied. Nylon fibers have been used in different percentages of 0.1, 0.2, 0.3 and 0.4% (by the weight of total mixture), and nanoclay has been used in 2, 4 and 7% (by the weight of bitumen). It is found that the addition of fibers is more effective than the nanoclay for increasing the resistance against fatigue cracking. However, nanoclay improves the resistance of the mixture against permanent deformation better than the nylon fibers. The results also show that the mixture reinforced by 0.4% of nylon fibers and containing 7% of nanoclay has the highest resilient modulus, Marshall stability and fatigue life. However, the mixture containing only 7% of nanoclay has the highest resistance against permanent deformation.


Main Subjects

Abtahi, S. M., Sheikhzadeh, M., Alipour, R. and Hejazi, S. M. (2009). "Physical and mechanical properties of fibers-reinforced bitumen mixtures", 7th National Conference on Textile Engineering, Rasht, Iran.

Alatas, T. and Yilmaz, M. (2013). "Effects of different polymers on mechanical properties of bituminous binders and hot mixtures", Construction and Building Materials, 42, 161-167. 

Asphalt Institute. (1997). Mix design methods for asphalt, 6th Edition, MS-02, Asphalt Institute, Lexington, KY.

Becker, O., Varley, R. and Simon, G. P. (2002). "Morphology, thermal relaxations and mechanical properties of layered silicate nanocomposites based upon high-functionality epoxy resins", Polymer, 43 (16), 4365-4373. 

Chen, H., Li, N., Hu, C. and Zhang, Z. (2004). "Mechanical performance of fibers-reinforced asphalt mixture", Journal of Chan University, 24(2), 1-5.

Iran Asphalt Pavements Roads Code. (2012). Publication No. 234, Management and Planning Chemistry of MaterialsOrganization, Iran.

Do─čan, M. and Bayramli, E. (2009). "Effect of polymer additives and process temperature on the physical properties of bitumen-based composites", Journal of Applied Polymer Science, 113 (4), 2331-2338.

Echols, J. (1989). "New mix method for fiber-reinforced asphalt", Public Works,119(8), 72-73.

Gama, D.A.,  Jonior, J.M.R., Alves de Molde, T.J. and Rodrigues, J.K.G. (2016). "Rheological studies of asphalt modified with elastomeric polymer", Journal of Construction and Building Materials, 106, 290-295. 

Garcia, A., Novambuena-Contras, J., Partl, M.N. and Schuetz, P. (2013). "Uniformity and mechanical properties of dense asphalt concrete with steel wool fibers", Construction and Building Materials, 43(9), 107-117.

Ghaffarpour Jahromi, S., Andalibzade, B. and Vossough, S. (2010). "Engineering properties of nanoclay modified asphalt concrete mixtures", The Arabian Journal for Science and Engineering, 35(1B), 88-103.

Ghafarpour Jahromi, S., Vosough, S., Ahmadi, N.A. and Andalibizade, B. (2012). "Effect of nanoclay and precipitated calcium carbonate on mechanical properties of asphalt Concrete", Journal of Civil and Surveying Engineering, 45(3), 335-344.

Ghile, D. (2005). "Effects of nanoclay modification on rheology of bitumen and on performance of asphalt mixtures", M.Sc. Thesis, Delft University of Technology.

Goel, A. and Das, A. (2004). "Emerging road materials and innovative”, National Conference on Materials and Their Application in Civil Engineering, Hamipur, India, August.

Hansen, R., McGennis, B., Prowell, B. and Stonex, A. (2000). "Current and future uses of non-bituminous components of bituminous paving mixtures", Transportation in the New Millennium. Washington (USA): TRB A2D02.

Hashemi, S. M., Latifi Namin, M. (2012). "The study of the effect of temperature, binder content and compaction on resilient modulus of HMA", Journal of Civil and Surveying Engineering, 45(7), 791-802.

Huang, H. and White, T.D. (1996). "Dynamic properties of fiber-modified overlay mixture", Transportation Research Record No.1455, TRB, National Research Council, Washington D.C., pp. 98-104.

Isacsson, U. and Zeng, H. (1998). "Low-temperature cracking of polymer-modified asphalt", Journal of Materials and Structures, 31(1), 58-63.

Jahromi, S. and Khodaii, A. (2008). “Carbon fiber reinforced asphalt concrete”, Arabian Journal of Science and Engineering, 32(2B), 355-364. 

Liu, Y.L., Hsu, C.Y., Wei, W.L. and Jeng, R.J. (2003). "Preparation and thermal properties of epoxy–silica nanocomposites from nanoscale colloidal silica", Polymer, 44 (20), 123-129. 

Maurer, D.A. and Gerald, M. (1989). "Field performance of fabrics and fibers to retard reflective cracking", Transportation Research Record, 1248, 13-23.  

Mohammad Yusoff, N.I., Saleh Breem, A.B., Alattug, H.N.M., Hamim, A. and Ahmad, J. (2015). "The effects of moisture susceptibility and ageing conditions on nano-silica/polymer-modified asphalt mixtures", Journal of Construction and Building Materials, 72, 139-147. 

Park, P., Rew, Y. and Baranikumar, A. (2014). ”Controlling conductivity of asphalt concrete with graphite”, Report No. SWUTC/14/600451-00025-1, Texas A&M Transportation Institute, Texas, USA.

Putman, B.J. and Amirkhanian, S.N. (2004). "Utilization of waste fibers in stone matrix asphalt mixtures", Resources, Conservation and Recycling, 42(3), 265-274. 

Tapkin, S. (2008). "The effect of polypropylene fibers on asphalt performance", Building and Environment, 43(6), 1065-1071.  

Sadeque, M. and Patil, K.A. (2013). "Rheological properties of recycled low density polyethylene and polypropylene modified bitumen”, International Journal of Advanced Technology in Civil Engineering, 2(2), 24-26.

Samsonov, M.V. and Gureev, A.A. (2013). "Feasibility of modifying properties of road asphalts with polyethylene and plasticizers", Chemistry and Technology of Fuels and Oils, 49(5), 420-424.

Shafabahsh, G.H. and Jafari Ani, O. (2015). "Experimental investigation of effect of nano TiO2/SiO2 modified bitumen on the rutting and fatigue performance of asphalt mixtures containing steel slag aggregates", Journal of Construction and Building Materials, 98, 692-702.   

Shafabakhsh, G.H., Mirabdolazimi, S.M., Sadeghinejad, M. (2015). "Evaluation the effect of nano-TiO2 on the rutting and fatigue behavior of asphalt mixtures", Journal of Construction and Building Materials, 54, 566-572.

Sengoz, B. and Isikyakar, G. (2008), "Analysis of styrene-butadiene-styrene polymer modified bitumen using fluorescent microscopy and conventional test methods", Journal of Hazardous Materials, 150(2), 424-432. 

Sheeba, J. B. and Rohini, A.K. (2014). "Structural and thermal analysis of asphalt solar collector using Finite Element method", Journal of Energy, Dec., 1-9.

Wu, S., Ye, Q., Li, N. and Yue, H. (2007). "Effects of fibers on the dynamic properties of asphalt mixtures", Journal of Wuhan University of Technology – Material Science, 22(4), 733-736.  

Wu, S., Liu, X., Ye, Q. and Li, N. (2006). "Self-monitoring electrically conductive asphalt-based composite with carbon fillers”, Transactions of Nanferrous Metals Society of China, 16(2), 512-516.