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ISSN (Online): 2328-3998

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Article

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: sbadawy@mans.edu.eg

Abstract

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.

Keywords

References

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Article

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: engaram@yahoo.com

Abstract

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.

Keywords

References

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Article

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: carladams1702@yahoo.com

Abstract

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.

Keywords

References

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