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Currrent Issue: Volume 4, Number 4, 2016


Estimation of the Yield Stress of Cement Pastes from Electrical Resistivity Measurement

1School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 430074, Wuhan, China

2State Key Laboratory of Silicate, Wuhan University of Technology, 430070, Wuhan, China

American Journal of Civil Engineering and Architecture. 2016, 4(4), 125-132
doi: 10.12691/ajcea-4-4-3
Copyright © 2016 Science and Education Publishing

Cite this paper:
Mbujje Joel Webster, Wei XiaoSheng, Makorogo Javilla Barugahare. Estimation of the Yield Stress of Cement Pastes from Electrical Resistivity Measurement. American Journal of Civil Engineering and Architecture. 2016; 4(4):125-132. doi: 10.12691/ajcea-4-4-3.

Correspondence to: Mbujje  Joel Webster, School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 430074, Wuhan, China. Email:


This study proposes a continuous method for predicting the yield stress development from mixing until the final setting point. Samples prepared with water to cement ratios (w/c) of 0.3, 0.35 and 0.4 are tested using a vane in cup rheometer, a Vicat needle and a non contact electrical resistivity machine (NC-ERM). Times corresponding to the initial yield stress (ta), a dramatic increase in the yield stress (tb), a maximum torque reading on the rheometer (tc), an initial setting (td) and a final setting (te) on the yield stress-time (τ(t)-t) curve are correlated with the time at a point of inflexion (tP) on the bulk resistivity-time (ρ(t)-t) curve. A quantitative relationship developed between the yield stress and electrical resistivity shows a good agreement with experimental data.



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Durability and Fire Resistance of Laterite Rock Concrete

1Department of Civil Engineering, Rivers State University of Science and Technology, Port-Harcourt, Nigeria

2Department of Civil Engineering, Auchi Polythechnic, Auchi, Edo State, Nigeria

3Department of Civil Engineering, University of Port Harcourt, Port Harcourt, Nigeria

American Journal of Civil Engineering and Architecture. 2016, 4(4), 117-124
doi: 10.12691/ajcea-4-4-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Ephraim M. E., Adoga E.A., Rowland-Lato E. O.. Durability and Fire Resistance of Laterite Rock Concrete. American Journal of Civil Engineering and Architecture. 2016; 4(4):117-124. doi: 10.12691/ajcea-4-4-2.

Correspondence to: Rowland-Lato  E. O., Department of Civil Engineering, University of Port Harcourt, Port Harcourt, Nigeria. Email:


The ability of a structure to retain its structural integrity in adverse conditions of weather and fire out break depends on its durability and fire resistance. This research work investigated these indispensable properties in Laterite Rock Concrete to assess its usability structural concrete. Durability was investigated in terms of water absorption, density, shrinkage and fire resistance. Fire resistance test was carried out using direct fire test. Two mix proportions: 1:2:4 and 1:1½:3 were tested at optimum water/cement ratio of 0.6 and 0.55 for 1:2:4 and 1:1½:3 mixes respectively. From the results, it is concluded that the concrete is durable, environmentally compatible and possesses high fire resistance properties, having satisfied the relevant codes requirements. The 1:2:4 and 1:1½:3 conform to the specifications for grades 15 and 20 correspondingly. Recommendations include specifications for designing structural elements using the Laterite Rock Concrete.



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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.



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