American Journal of Civil Engineering and Architecture

ISSN (Print): 2328-398X

ISSN (Online): 2328-3998

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Website: http://www.sciepub.com/journal/AJCEA

   

Article

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: mbujje@gmail.com

Abstract

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.

Keywords

References

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Article

Physical, Mechanical and Microstructural Properties of Limestone High Performance Concrete

1Unity of research: Materials - Processes and Environment, Boumerdes University, Algeria

2Laboratory of Construction & Environment, ENP- Algiers, Algeria

3Laboratory of Materials Engineering of Brittany, UBS, French


American Journal of Civil Engineering and Architecture. 2016, 4(4), 133-141
doi: 10.12691/ajcea-4-4-4
Copyright © 2016 Science and Education Publishing

Cite this paper:
R. Chaid, A. Bali, A. PERROT, M. Mansour. Physical, Mechanical and Microstructural Properties of Limestone High Performance Concrete. American Journal of Civil Engineering and Architecture. 2016; 4(4):133-141. doi: 10.12691/ajcea-4-4-4.

Correspondence to: R.  Chaid, Unity of research: Materials - Processes and Environment, Boumerdes University, Algeria. Email: chaidr@yahoo.fr

Abstract

The production of a high performance concrete (HPC) has expanded the scope use of concrete exposed to aggressive environments, thanks to the limited porosity, the durability, the rheological, physical and mechanical properties with the respect remarkable to a conventional concrete. The objective of this study is to develop a HPC incorporating finely ground limestone. The results show that the substitution of one part of cement by limestone contributes more to the improvement of physical, mechanical and microstructural properties of concrete. The couple cement/limestone contributes significantly to a densification of the matrix unlike when the cement is not substituted by addition. The survey also shows that the limestone does not fall into any chemical reaction. However, the development of resistance (physical phenomenon), obviously depends on the quality of hydrates supplied by the hydration, but also how these hydrates are assembled, their arrangement in space and their connections.

Keywords

References

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Article

Assessing Distress Cause and Estimating Evaluation Index for Marine Concrete Structures

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

2Department of Construction Management, University of Houston, Houston, TX, USA

3Department of maritime technology, Amirkabir University of Technology, Tehran, Iran

4Concrete technology and durability research center, Amirkabir University of Technology, Tehran, Iran


American Journal of Civil Engineering and Architecture. 2016, 4(4), 142-152
doi: 10.12691/ajcea-4-4-5
Copyright © 2016 Science and Education Publishing

Cite this paper:
Masoud Dehghani Champiri, Shahin Sajjadi, S. Hossein Mousavizadegan, Faramarz Moodi. Assessing Distress Cause and Estimating Evaluation Index for Marine Concrete Structures. American Journal of Civil Engineering and Architecture. 2016; 4(4):142-152. doi: 10.12691/ajcea-4-4-5.

Correspondence to: Masoud  Dehghani Champiri, Department of Civil and Environmental engineering, University of Houston, Houston, TX, USA. Email: mdehghanichampiri@uh.edu

Abstract

Marine concrete structures may be affected with wide varieties of distresses where they may have different severity and extent. A periodic inspection program should be drawn to assess the structure condition and to specify the maintenance strategies. These inspections are carried out with several destructive and non-destructive tests which are very expensive. This paper tried to classify concrete distresses in the marine environment first and then, provided an evaluation method using an expert system. An extensive literature review, interviews with expert supervisors and a national survey were used to develop this expert system which is capable of determining the health index for concrete structures in marine environment. This marine structure condition index (MSCI) can be applied to assess the structural condition with a visual supervision and elementary measurements. The index is based on expert views with respect to the type, severity and extent of distresses. The specified index provides some appropriate maintenance strategies for the structure. Case studies showed that the proposed method gives better results and removed some deficiencies of some exiting approaches like what US Army Corps of Engineers suggested before.

Keywords

References

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