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The Microstructural and Mechanical Characterization of Organo-Clay-Modified Bitumen, Calcareous Aggregate, and Organo-Clay Blends

Authors: A. Gürses, T. B. Barın, Ç. Doğar


Bitumen has been widely used as the binder of aggregate in road pavement due to its good viscoelastic properties, as a viscous organic mixture with various chemical compositions. Bitumen is a liquid at high temperature and it becomes brittle at low temperatures, and this temperature-sensitivity can cause the rutting and cracking of the pavement and limit its application. Therefore, the properties of existing asphalt materials need to be enhanced. The pavement with polymer modified bitumen exhibits greater resistance to rutting and thermal cracking, decreased fatigue damage, as well as stripping and temperature susceptibility; however, they are expensive and their applications have disadvantages. Bituminous mixtures are composed of very irregular aggregates bound together with hydrocarbon-based asphalt, with a low volume fraction of voids dispersed within the matrix. Montmorillonite (MMT) is a layered silicate with low cost and abundance, which consists of layers of tetrahedral silicate and octahedral hydroxide sheets. Recently, the layered silicates have been widely used for the modification of polymers, as well as in many different fields. However, there are not too much studies related with the preparation of the modified asphalt with MMT, currently. In this study, organo-clay-modified bitumen, and calcareous aggregate and organo-clay blends were prepared by hot blending method with OMMT, which has been synthesized using a cationic surfactant (Cetyltrymethylammonium bromide, CTAB) and long chain hydrocarbon, and MMT. When the exchangeable cations in the interlayer region of pristine MMT were exchanged with hydrocarbon attached surfactant ions, the MMT becomes organophilic and more compatible with bitumen. The effects of the super hydrophobic OMMT onto the micro structural and mechanic properties (Marshall Stability and volumetric parameters) of the prepared blends were investigated. Stability and volumetric parameters of the blends prepared were measured using Marshall Test. Also, in order to investigate the morphological and micro structural properties of the organo-clay-modified bitumen and calcareous aggregate and organo-clay blends, their SEM and HRTEM images were taken. It was observed that the stability and volumetric parameters of the prepared mixtures improved significantly compared to the conventional hot mixes and even the stone matrix mixture. A micro structural analysis based on SEM images indicates that the organo-clay platelets dispersed in the bitumen have a dominant role in the increase of effectiveness of bitumen - aggregate interactions.

Keywords: Hot mix asphalt, stone matrix asphalt, organo clay, Marshall Test, calcareous aggregate, modified bitumen.

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[1] Capitão, S.D., Picado-Santos, L.G., Martinho, F. (2012). Pavement engineering materials: Review on the use of warm-mix asphalt, Constr. Build. Mater., 36, 1016–1024.
[2] You, Z., Mills-Beale, J., Foley, J. M., Roy, S., Odegard, G. M., Dai, Q., Goh, S.W. (2011). Nanoclay-modified asphalt materials: Preparation and characterization, Constr. Build. Mater., 25,(2) 1072–1078.
[3] Nejad, F. M., Azarhoosh, A. R., Hamedi, GH. H. Azarhoosh, M. J. (2012). Influence of using nonmaterial to reduce the moisture susceptibility of hot mix asphalt, Constr. Build. Mater., 31, 384–388.
[4] Suresha, S. N., Varghese, G., Ravi Shankar, A. U., (2009). A comparative study on properties of porous friction course mixes with neat bitumen and modified binders, Constr. Build. Mater., 23, 1211–1217.
[5] Kalyoncuoglu, S. F., Tigdemir, M. (2011). A model for dynamic creep evaluation of SBS modified HMA mixtures, Constr. Build. Mater., 25, 859–866.
[6] Yao, H., You, Z., Li, L., Shi, X., Goh, S. W., Mills-Beale, J., Wingard, D. (2012). Performance of asphalt binder blended with non-modified and polymer-modified nanoclay, Constr. Build. Mater., 35, 159–170.
[7] Kok, B. V., Kuloglu, N. (2011). Effects of Two-Phase Mixing Method on Mechanical Properties of Hot Mix Asphalt Road Mater. Pavement. 12(4), 721-738.
[8] Ameri, M., Mansourian, A., Ashani, S. S., Yadollahi G. (2011). Technical study on the Iranian Gilsonite as an additive for modification of asphalt binders used in pavement construction, Constr. Build. Mater., 25, 1379–1387.
[9] El-Shafie, I. M., Ibrahim, M., Abd El Rahman, A. M. M. (2012). The addition effects of macro and nano clay on the performance of asphalt binder, Egyptian Journal of Petroleum 21, 149–154.
[10] Lesueur, D. (2009). The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification, Adv. Colloid Interfac., 145, 42–82.
[11] Baochang, Z., Man, X., Dewen, Z., Huixuan, Z., Baoyan, Z. (2009). The effect of styrene–butadiene–rubber/montmorillonite modification on the characteristics and properties of asphalt, Constr. Build. Mater., 23, 3112–3117.
[12] Yu, J., Zeng, X., Wu, S., Wang, L., Liu, G., (2007). Preparation and properties of montmorillonite modified asphalts, Mat. Sci. Eng. A, 447, 233–238.
[13] Lu, X., Isacsson, U. (1997). Rheological characterization of styrene-butadiene-styrene copolymer modified bitumens, Constr. Build. Mater., 11, 23-32.
[14] Gürses, A., Barin, T.B. and Dogar, Ç. (2012). The development of non wettable wearing courses composed aggregate-organo-clay-polymer mix. Proceedings of the 4th International Conference on Nanostructures. Retrieved from
[15] Yildirim, Y. (2007). Polymer modified asphalt binders, Constr. Build. Mater., 21, 66–72.
[16] Gürses, A., Açıkyıldız M., Yolcu H. (2009). Hydrophobic organoclay, Patent No. TR2009 03106 B. Ankara: Turkey. Turkish Patent Institute.
[17] Gürses, A., Güneş K., Mindivan F., Korucu Ejder M., Acikyildiz, M., Doğar, Ç. (2014) The Investigation of Elektrokinetic Behaviour of Micro-Particles Produced by CTA+ ions and Na-Montmorillonite, Applied Surface Science, 318, 76-84.
[18] Roberts, F. L., Kandhal, P. S., Brown, E. R., Lee, D. Y., Kennedy, T. W. (1996). Hot Mix Asphalt Materials, Mixture Design, and Construction. National Asphalt Pavement Association; 2nd edition.
[19] Montepara, A., Romeo, E., Birgisson, B., Tebaldi, G. (2010). Strain localization and damage distribution in SBS polymer modified asphalt mixtures Road Mater. Pavement., 11 (4), 899-915.
[20] Al-Hadidy, A. I., Tan, Y-Q. (2011). The effect of SBS on asphalt and SMA mixture properties, J. Mater. Civil. Eng., 23, 504.
[21] Liu, D-L., Bao, S-Y., (2007) Research of improvement of SBS modified asphalt pavement performance by organic monotmorillonite, J. Build. Mater., 10(4), 500–504.
[22] Goh, S. W., Akin, M., You, Z., Shi, X. (2011). Effect of deicing solutions on the tensile strength of micro- or nano-modified asphalt mixture, Constr. Build. Mater., 25(1), 195–200.
[23] Simon, M., Stafford, K., Ou, D. (2008). Nanoclay reinforcement of liquid silicone rubber, J. Inorg. Organomet. Polym. Mater., 18(3), 364–373.
[24] Wanjale, S. D., Jog, J. P. (2003). Effect of modified layered silicates and compatibilizer on properties of PMP/cray nanocomposites, J. Appl. Polym. Sci., 90, 3233–3238.