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Effect of Functionalization and Mixing Process on the Rheological Properties of Asphalt Modified with Carbon Nanotubes

1Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

2Department of Construction and Architectural Engineering, The American University in Cairo, New Cairo, Egypt

American Journal of Civil Engineering and Architecture. 2016, 4(3), 90-97
doi: 10.12691/ajcea-4-3-4
Copyright © 2016 Science and Education Publishing

Cite this paper:
Ibrahim Amin, Sherif M. El-Badawy, Tamer Breakah, Mourad H. Z. Ibrahim. Effect of Functionalization and Mixing Process on the Rheological Properties of Asphalt Modified with Carbon Nanotubes. American Journal of Civil Engineering and Architecture. 2016; 4(3):90-97. doi: 10.12691/ajcea-4-3-4.

Correspondence to: Sherif  M. El-Badawy, Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt. Email:


The aim of this paper is to investigate the rheological properties of conventional asphalt modified with Multi- Walled Carbon Nano Tubes (MWCNTs). Pristine MWCNTs were chemically modified using acid functionalization process to introduce carboxylic acid groups onto the surface of MWCNTs. The pristine and functionalized MWCNTs were then characterized by Scanning Electron Microscope (SEM) and electron dispersion X-ray (EDX) analysis. A 3% (by weight of asphalt) of pristine and functionalized MWCNTs were each blended with a base asphalt at 120°C. The properties of the base and modified asphalts were evaluated using softening point, rotational viscometer and dynamic shear rheometer (DSR) for both original and short term aged asphalts using the rolling this film oven (RTFO) test. The results indicated that the use of MWCNTs as a modifier was helpful in improving the conventional and rheological properties of the asphalt. Generally, it was found that the softening point, as well as the rotational viscosity, were increased and the temperature susceptibility was improved. The results showed a remarkable improvement in the binder complex shear modulus, failure temperature, and rutting resistance. The rheological properties of the asphalt modified with pristine MWCNTs were better than the functionalized MWCNTs. Finally, the effect of mixing technique (high shear mixer and a manufactured mechanical mixer) of MWCNTs with asphalt was evaluated. Results showed that both mixers yielded similar properties based on the rotational viscosity testing.



[1]  Hasan, Z., Kamran, R., Mohammad, F., Ahmad, G. and Hosein, F, “Evaluation of Different Conditions on the Mixing Bitumen and Carbon Nano-tubes,” International Journal of Civil & Environmental Engineering, 12(6), 12-53, December 2012.
[2]  F. Allhoff, P. Lin and D. Moore, What is Nanotechnology and why Does it Matter?: from Science to Ethics, Oxford, Wiley-Blackwell, January 2010.
[3]  Faramarzi, M., Arabani, M., Haghi, A. and Mottaghitalab, V., “Carbon Nanotubes-Modified Asphalt Binder: Preparation and Characterization,” International Journal of Pavement Research and Technology, 8(1), 29-37, Jan. 2015.
[4]  Fang, C., Yu, R., Liu, S. and Li, Y., “Nanomaterials Applied in Asphalt Modification: A Review,” Journal of Materials Science & Technology, 29 (7), 589-594, April 2013.
[5]  Jahromi, S.G. and A. Khodaii, “Effects of Nanoclay on Rheological Properties of Bitumen Binder,” Construction and Building Materials, 23 (8), 2894-2904, March 2009.
Show More References
[6]  You, Z., Mills-Beale, J., Foley, J. M., Roy, S., Odegard, G. M., Dai, Q. and Goh, S. W “Nanoclay-Modified Asphalt Materials: Preparation and Characterization,” Construction and Building Materials, 25 (2), 1072-1078, July 2010.
[7]  Mahdi, L. M., Muniandy, R., Yunus, R. B., Hasham, S. and Aburkaba, E., “Effect of Short Term Aging on Organic Montmorillonite Nanoclay Modified Asphalt,” Indian Journal of Science and Technology, 6 (11), 5434-5442, November 2013.
[8]  Schodek, D. L., Ferreira, P., and Ashby, M. F., Nanomaterials, Nanotechnologies and Design: An Introduction for Engineers and Architects, Butterworth-Heinemann, 2009.
[9] “What is Nanotechnology?,” November 7, 2006 , Available from: [Accessed 29-September-2015].
[10]  Defense Systems Information Analysis Center (DSIAC), “Carbon Nanotubes: Small Structures with Big Promise”, 2014, Available from: [Accessed 5-october-2015].
[11]  Monthioux, M., Carbon Meta-Nanotubes: Synthesis, Properties and Applications, John Wiley & Sons, 2011.
[12]  Luo, S., Liu, T., Benjamin, S. M., Brooks, J. S., “Variable Range Hopping in Single-Wall Carbon Nanotube Thin Films: A Processing–Structure–Property Relationship Study,” Langmuir, 29 (27), 8694-8702, June 2013.
[13]  Ajayan, P, “Nanotubes from Carbon,” Chemical reviews, 99 (7), 1787-1799, March 1999.
[14]  Sarangdevot, K., Sonigara, B. S., “The Wondrous World of Carbon Nanotubes: Structure, Synthesis, Properties & Applications,” Journal of Chemical and Pharmaceutical Research, 7 (6), 916-933, 2015.
[15]  Koch, C., Ovid'ko, I., Seal, S. and Veprek, S., Structural Nanocrystalline Materials. Fundamentals and Applications, Cambridge University Press, 2007.
[16]  Steyn, W. J., Bosman, T. E., Galle, S. and Heerden, V.J., “Evaluating the Properties of Bitumen Stabilized with Carbon Nanotubes,” in Advanced Materials Research, Trans Tech Publisher, 312-319.
[17]  Abuilaiwi, F. A., Laoui, T., Al-Harthi, M. and Atieh, M. A., “Modification and Functionalization of Multiwalled Carbon Nanotube (Mwcnt) Via Fischer Esterification,” The Arabian Journal for Science and Engineering, 35 (1C), 37-48, June 2010.
[18]  Santagata, E., Baglieri, O., Tsantilis, L. and Chiappinelli, G. “Fatigue Properties of Bituminous Binders Reinforced with Carbon Nanotubes,” International Journal of Pavement Engineering, 16 (1), 80-90, March 2014.
[19]  Liu, C.-X. and Choi, J.-W., “Improved Dispersion of Carbon Nanotubes in Polymers at High Concentrations,” Nanomaterials, 2 (4), 329-347, October 2012.
[20]  Ames, G., “Mixing, Blending and Size Reduction Handbook.” 2001, Available from: [Accessed 7 April 2014].
[21]  Silverson. “Mixing with a High Shear Laboratory Mixer.” 2016, Available from: [Accessed 20 January 2016].
[22]  Scheibe, B., Borowiak-Palen, E. and Kalenczuk, R., “Oxidation and Reduction of Multiwalled Carbon Nanotubes—Preparation and Characterization,” Materials Characterization, 61 (2), 185-191, 2010.
[23]  Balasubramanian, K. and Burghard, M., “Chemically Functionalized Carbon Nanotubes,” Small, 1 (2), 180-192, 2005.
[24]  Yang, J., Wang, S.-C., Zhou, X.-Y. and Xie, J., “Electrochemical Behaviors of Functionalized Carbon Nanotubes in Lipf6/Ec+ Dmc Electrolyte,” International Journal of Electrochemical Science, 7 (2012), 6118-6126, July 2012.
[25]  ASTM D36 / D36M-14e1, “Standard Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus),” ASTM International, West Conshohocken, PA, 2014.
[26]  Faramarzi, M., Arabani, M., Haghi, A. K., and Motaghitalab, V. “A Study on the Effects of CNT’s on Hot Mix Asphalt Marshal-Parameters, ”International Symposium on Advances in Science and Technology, Marsh 2011.
[27]  ASTM D4402 / D4402M-15, “Standard Test Method for Viscosity Determination of Asphalt at Elevated Temperatures Using a Rotational Viscometer,” ASTM International, West Conshohocken, PA, 2015.
[28]  Abdel Raouf, M., and William R. C., 'Determination of Pre-Treatment Procedure Required for Developing Bio-Binders from Bio-Oils', Proceedings of the 2009 Mid-Continent Transportation Research Symposium. Ames, IA, USA (2009).
[29]  [ASTM D7175-08, “Standard Test Method for Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer,” ASTM International, West Conshohocken, PA, 2008.
[30]  ASTM D2872-12e1, “Standard Test Method for Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test),” ASTM International, West Conshohocken, PA, 2012.
[31]  Pavement Interactive. “Superpave Performance Grading.” 2008, Available from: [Accessed 10 October 2015]
[32]  Pan, B. and Xing, B., “Adsorption Mechanisms of Organic Chemicals on Carbon Nanotubes,” International Journal of Civil & Environmental Engineering, 42(24), 9005-9013, October 2008.
Show Less References


Analytical Modeling of Large-Scale Testing of Axial Pipe-Soil Interaction in Ultra-Soft Soil

1Civil and Environmental Engineering Department, University of Houston, TX, USA

2Civil Engineering Department, University of Kirkuk, Kirkuk, Iraq

American Journal of Civil Engineering and Architecture. 2016, 4(3), 98-105
doi: 10.12691/ajcea-4-3-5
Copyright © 2016 Science and Education Publishing

Cite this paper:
Mohammad S. Joshaghania, Aram M. Raheem, Reza Mousavic. Analytical Modeling of Large-Scale Testing of Axial Pipe-Soil Interaction in Ultra-Soft Soil. American Journal of Civil Engineering and Architecture. 2016; 4(3):98-105. doi: 10.12691/ajcea-4-3-5.

Correspondence to: Aram  M. Raheem, Civil Engineering Department, University of Kirkuk, Kirkuk, Iraq. Email:


In this study, large-scale model test with dimensions of 2.4 m*2.4 m*1.8 m has been designed to investigate the behavior of axial pipe-soil interaction on the simulated ultra-soft seabed. Large-scale tests were performed on plastic pipes by loading the pipe from the ends, placed on ultra-soft clayey soil with undrained shear strength ranged from 0.01 kPa to 0.1 kPa, to quantify the axial soil-pipe interaction. An accurate remote gridding system was developed for displacement measurement. Two new models were used to correlate the shear strength with the water content of the ultra-soft soil. The models were verified with data points reported in the literature and experimental tests performed in the laboratory. The shear strength was correlated strongly with water content of ultra-soft soil with coefficient of correlation (R2) up to 0.91. Moreover, new analytical models were established to predict the axial break-out resistance and large-displacement residual resistance in ultra-soft soil. The new models have taken into account the effects of vertical loads (W), normalized initial embedment (δin), boundary length (λ), and the rate of axial loading (Vp). The new models have shown very good predictions for the experimental results with coefficient of correlation (R2) up to 0.87. Also, a new analytical model (p-q-m) was proposed to predict the force-displacement relationship for axial testing of pipe-soil interaction. This new model (p-q-m) has also shown a very good agreement with the experimental testing results for the full force-displacement response of pipe soil interaction. Detailed statistical procedure has been used to analyze the performance of both p-q and p-q-m models. The modified p-q model presents better estimation using any of the statistical methods.



[1]  Guo B., Son S., Chacko J., and Ghalambor A. (2005). “Off-shore Pipelines,” Elsevier Inc.
[2]  Champiri, M. D., Mousavizadegan, S. H., Moodi, F. (2012). “A Decision support system for diagnosis of distress cause and repair in marine concrete structures,” International journal of Computers and Concrete, Techno press, Vol. 9, No. 2, pp. 99-118.
[3]  Champiri, M. D., Mousavizadegan, S. H., Moodi, F. (2012). “A fuzzy classification system for evaluating health condition of marine concrete structures,” Journal of Advanced Concrete Technology, Vol. 10, pp. 95-109.
[4]  Bruton D., Carr M., White D. J., and Cheuk J. C. Y. (2008). “Pipe-Soil Interaction During Lateral Buckling and Pipeline Walking,” The SAFEBUCK JIP.
[5]  Bai Y. and Bai Q. (2005). “Subsea Pipelines and Risers,” Elsevier Ltd.
Show More References
[6]  Foss P. (2013). “Guidance”, Spring of 2013.
[7]  Dixon D.A. and Rultledge D.R. (1968). “Stiffened Catenary Calculation in Pipeline Laying Problem.,” J Eng Ind; Vol.(90B), No.(1), pp.153–60.
[8]  Lenci S. and Callegari M. (2005). “Simple Analytical Models for the J-Lay Problem,” Acta Mech , Vol.(178), pp.23-39.
[9]  Chai Y.T. and Varyani K.S. (2006). “An Absolute Coordinate Formulation for Three- Dimensional Flexible Pipe Analysis,” Ocean Eng., Vol.(33), pp.23-58.
[10]  Wang D., White D. J. and Randolph M. F. (2010). “Large-Deformation Finite Element Analysis of Pipe Penetration and Large-Amplitude Lateral Displacement,” Can. Geotechnical J., Vol. (47), No.(8), pp. 842-856.
[11]  Lyons C.G. (1973). “Soil Resistance to Marine Lateral Sliding Pipe Lines,” Dallas (TX), OTC.
[12]  Wantland G.M., O'Neill M.W., Reese L.C. and Kalajian E.H. (1979). “Lateral Stability of Pipelines in Clay,” Houston, USA, OTC-3477-MS.
[13]  Lambrakos K.F. (1985). “Marine Pipeline Soil Friction Coefficients from In-Situ Testing,” Ocean Engineering, Vol.(12), No.(2), pp.131-50.
[14]  Brennodden H., Sveggen O., Wagner D.A.and Murff J.D. (1986). “Full-Scale Pipe-Soil Interaction Tests,” Houston, USA, OTC 5338-MS.
[15]  Murff J.D., Wagner D.A. and Randolph M.F. (1989). “Pipe Penetration in Cohesive Soil,” Geotechnique, Vol.(39), No.(2), pp.213-229.
[16]  Joshaghani, M.S ., Raheem A.M. (2014) “ Full-scale Testing and Numerical Modeling of Axial and Lateral Soil Pipe Interaction in Deepwater” Recent Advances in Continuum-Scale Modeling of Flow and Reactive Transport in Porous Media Posters , 2014 AGU Fall Meeting.
[17]  Mebarkia S. (2006). "Effect of High-Pressure/High-Temperature Flowlines and Soil Interaction on Subsea Development,” Houston, USA, OTC 18107-MS.
[18]  Vipulanandan, C., Yanhouide, J. A., & Joshaghani, S. M. (2013). “Deepwater Axial and Lateral Sliding Pipe-Soil Interaction Model Study,” Pipelines 2013, Pipelines and Trenchless Construction and Renewals-A Global Perspective, ASCE, pp. 1583-1592.
[19]  Raheem, A. M., and Joshaghani, M. S. (2016). “Modeling of Shear Strength-Water Content Relationship of Ultra-Soft Clayey soil,” International Journal of Advanced Research (2016), Volume 4, Issue 4, pp. 537-545.
[20]  Raheem A.M., Vipulanandan C. and Ayoub A. (2013). “Shear Strength Relationship for Very Soft Clayey Soils,” Proceeding of CIGMAT Conference & Exhibition, Houston, USA.
[21]  Vipulanandan C. and Mebarkia S. (1990). “Effect of Strain Rate and Temperature on the Performance of Epoxy Mortar,” Polymer Engineering and Science, Vol. 30, No. 2, pp. 734-740.
[22]  Mantrala, K S , Vipulanandan, C. (1995). “Nondestructive Evaluation of Polyester Polymer Concrete,” ACI Materials Journal, Vol. 92, No. 6, pp. 660–68.
[23]  Bruton D., White D., Cheuk C., Bolton M., and Carr M. (2006). “Pipe/Soil Interaction Behavior During Lateral Buckling,” SPE Projects, Facilities & Construction, pp. 1-9.
[24]  El-Sakhawy N.R., Youssef K. M. and Badawy R. A. E. (2008),”Prediction of the Axial Bearing Capacity of Piles by Five-Cone Penetration Test Based Design Methods”, (IAMAG),1-6 Oct 2008,India.
Show Less References


Assessment of Turbo and Multilane Roundabout Alternatives to Improve Capacity and Delay at a Single Lane Roundabout Using Microsimulation Model Vissim: A Case Study in Ghana

1Graduate student Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

2Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

American Journal of Civil Engineering and Architecture. 2016, 4(4), 106-116
doi: 10.12691/ajcea-4-4-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Osei Kwame Kwakwa, Charles Anum Adams. Assessment of Turbo and Multilane Roundabout Alternatives to Improve Capacity and Delay at a Single Lane Roundabout Using Microsimulation Model Vissim: A Case Study in Ghana. American Journal of Civil Engineering and Architecture. 2016; 4(4):106-116. doi: 10.12691/ajcea-4-4-1.

Correspondence to: Charles  Anum Adams, Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. Email:


A single lane roundabout characterized by long queues during morning and evening peak periods was chosen as our study site. The objective of this study was to 1) Model and calibrate the vissim simulation model for the roundabout and 2) to model roundabout alternatives to improve capacity and assess the delay. A two hour video data collection was undertaken on a typical morning peak from which the traffic demand and turning movement data were extracted. The vissim micro simulation model was calibrated using the west approach as the target and the analysis was done for the existing single lane roundabout. A Turbo roundabout and a conventional double lane roundabout alternatives were also assessed. The capacity of the single lane roundabout was estimated as 2990 pcu/h and was performing at an ICU level of service H. Average Delay on the west approach was 232 seconds. The intersection capacity was 4392 pcu/h when the turbo roundabout alternative was assessed. Westbound vehicles experienced average delay of 87 seconds (inner lane) and 74 seconds (outer lane). The capacity of the conventional double lane roundabout was estimated to be 3690 pcu/h. The turbo roundabout concept will deliver a comparatively higher capacity and could be the most effective alternative to reduce congestion and delay.



[1]  Hoek, R. M. (2013). Signalized Turbo Roundabouts. A Study into the Applicability of Traffic Signals on Turbo Roundabouts. ec410eceabac/MasterThesis_RogierHoek.pdf&sa=U&ved=0CAsQFjAAahUKEwiN7MnPiNPIAhUK 2xoKHfIGCOI&usg=AFQjCNH3zRL4Fmoe2FXseNXV9-ShraUT3Q, accessed on 01/01/2015.
[2]  Fortuijn, L. G. H. (2009a): Turbo Roundabouts: Design Principles and Safety Performance. Transportation Research Record, 2096.
[3]  Transportation Research Board: Highway Capacity Manual, 2000.
[4]  Federal Highway Administration, United States Department of Transportation, and Washington, D.C.: Roundabouts: An Informational Guide. FHWA-RD-00-067, 2000
[5]  Silva, A. B., Santos, S. and Gaspar, M. (2013). Turbo-roundabout use and design. CITTA 6th Annual Conference on Planning Research RESPONSIVE TRANSPORTS FOR SMART MOBILITY.
Show More References
[6]  DHV Group and Royal Haskoning (2009). Roundabouts - Application and design, a practical manual. Dutch Ministry of Transport, Public Works and Water Management.
[7]  Forrest, P. L. and Kendal, G. R. (2014). Design and Implementation of the R102 – Zululand University Turbo Roundabout in Kwazulu-Natal, South Africa.
[8]  Vasconcelos, A. L. P., A. Bastos Silva, and Á. J. M. Seco (2012) Capacity of normal and turbo roundabout: comparative analysis 2012.
[9]  Giuffrè, O., Guerrieri, M. and Granà, A. (2012). Conversion of Existing Roundabouts into Turbo-Roundabouts: Case Studies from Real World. Aug. 2012, Volume 6, No. 8 (Serial No. 57), pp. 953–962 Journal of Civil Engineering and Architecture, ISSN 1934-7359, USA.
[10]  Campbell, D., Jurisich, I. and Dunn, R. (2012). Improved multi-lane roundabout designs for urban areas. NZ Transport Agency research report 476. 284pp.
[11]  Yperman, I. and Immers, L. H. (2003). Capacity of a turbo-roundabout determined by micro-simulation .Presented at 10th World Congress on ITS, Madrid, Spain.
[12]  Akcelik, R. (2005). Roundabout model calibration issues and a case study.TRB National Roundabout conference, vail, Colorado, USA.
[13]  Hummer, J. E. (2004). Handbook of Transportation Engineering. The McGraw-Hill Companies, 2004.
[14]  Bulla, L. A. and Castro, W. (2011). Analysis and Comparison between Two-Lane Roundabouts and Turbo Roundabouts Based on a Road Safety Audit Methodology and Micro- simulation: A Case Study in Urban Area, 2011.
[15]  Mauro, R. and Branco, F. (2010). Comparative Analysis of Compact Multilane Roundabouts and Turbo Roundabouts. Journal of Transportation Engineering, Vol. 136, No. 4, 2010.
[16]  Rodegerdts L., Blogg M., Wemple E., Myers E., Kyte M., Dixon M., Carter D. (2007). Roundabouts in the United States. Washington, D.C., USA: Transportation Research Board of the National Academies, NCHRP Report 572, 2007.
[17]  Engelsman, J. C., and M. Uken (2007). Turbo roundabouts as an alternative to two lane roundabouts. Presented at 26th Annual Southern African Transport Conference, South Africa.
[18]  Fortuijn, L. G. H. (2009b): Turbo roundabouts. Estimation of capacity. Transportation Research Record, 2130.
[19]  FHWA (2007). Traffic Analysis Toolbox Volume IV: Guidelines for Applying CORSIM Microsimulation Modeling Software. PUBLICATION NO. FHWA-HOP-07-079 JANUARY 2007.
[20]  GHA,(1991) Road Design Guide, Ghana Highway Authority, Ministry of Roads and Highways.
[21]  Adams, C.A., and Obiri-Yeboah, A., (2008). Saturation flows and passenger car equivalent values at signalized intersections on urban arterial roads in the Kumasi metropolis, Ghana. Proceedings of the International Conference on the best practices to Relieve Congestion on Mixed-Traffic Urban Streets in Developing Countries, IIT Madras, Chennai, India. September 2008.pp 13-19.
[22]  Planung Transport Verkehr AG (2011). VISSIM 5.30-05 User Manual.
Show Less References