i-manager's Journal on Civil Engineering (JCE)


Volume 4 Issue 2 March - May 2014

Article

Plastics and FRP Materials used in Railways

Pawan Malik*
Department of Chemistry, SL Bawa DAV College, Batala (Punjab), India.
Malik,P. (2014). Plastics And FRP Materials Used In Railways. i-manager’s Journal on Civil Engineering, 4(2), 1-4. https://doi.org/10.26634/jce.4.2.2983

Abstract

The emergence of Plastic industries has become a boon for various engineering applications. Plastics are durable, light weight materials, which are easy to transport. The major advantage of plastic is it is recyclable in nature, which helps to conserve landfill space, natural resources and reduce pollution. Earlier in railways, wooden, concrete or steel sleepers are used. Due to their high cost and limited life span, nowadays plastics sleepers are used all over the world at large scale. An attempt has been made to study various engineering plastics used in railways and the advantages of plastics over other construction materials. Moreover, special attention is given to Fiber reinforced plastics (FRP) i.e. plastics composites. The study concluded that plastics composites are more reliable, more economically viable and have longer life span.

Research Paper

Investigation on Characteristics of Fly Ash and Crusher Waste Stabilized Black Cotton Soil Bricks

T. Sekar*
Professor of Civil Engineering, University College of Engineering, Ramanathapuram, Tamil Nadu, India.
Sekar.T. (2014). Investigation On Characteristics Of Fly Ash And Crusher Waste Stabilized Black Cotton Soil Bricks. i-manager’s Journal on Civil Engineering, 4(2), 5-12. https://doi.org/10.26634/jce.4.2.2984

Abstract

An experimental investigation has been carried out to study the feasibility of manufacturing bricks from locally available black cotton soil using industrial waste materials such as fly ash and crusher waste. In order to study the characteristics of brick, a total of 504 numbers of brick specimens of 230 x 110 x 70 mm size were cast in three series by combining black cotton soil, fly ash and crusher waste in different proportions. The brick specimens were then air dried, baked in kiln and tested for compressive strength, water absorption, efflorescence and density as per IS:3495 code. Also, for comparison purpose, 18 numbers of conventional burnt clay bricks and 18 numbers of pressed type water cured cement fly ash bricks were tested for the aforesaid brick properties. Test results obtained in the present investigation indicate that it is possible to manufacture good quality bricks from locally available black cotton soil by suitably adding either fly ash or crusher waste or both, and such bricks can be used in lieu of conventional burnt clay bricks or pressed type water cured cement fly ash bricks presently in use for various construction activities.

Research Paper

Plastic Optic Fiber (POF) Based Phase Difference Measurement Method For Estimation Of Crack Mouth Opening Displacement (CMOD) In Concrete

K. Samrajyam* , B. Sobha**, T. D. Gunneswara Rao***, R.L.N. Sai Prasad****
* Research Scholar, Department of Physics, National Institute of Technology, Warangal, India.
** Associate Professor, Department of Physics, National Institute of Technology, Warangal, India.
*** Associate Professor, Department of Civil Engineering, National Institute of Technology, Warangal, India.
**** Professor, Department of Physics, National Institute of Technology, Warangal, India.
Samrajyam.K., Sobha.B., Rao,G.T.D., and Prasad,S.R.L.N. (2014). Plastic Optic Fiber (POF) Based Phase Difference Measurement Method For Estimation Of Crack Mouth Opening Displacement (CMOD) In Concrete. i-manager’s Journal on Civil Engineering, 4(2), 13-19. https://doi.org/10.26634/jce.4.2.2985

Abstract

Crack detection and measurement of crack width in concrete are important for structural health monitoring of structures. In this paper, we report on a technique for estimation of crack mouth opening displacement ((CMOD) in concrete specimens of M20 composition. It is based on the principle of using Plastic Optical Fiber(POF) based strain displacement sensor employing phase difference measurement technique. The motivation for the method has been to improve on the sensitivity of detection of crack width measurement and propagation by looking at the phase changes rather than amplitude changes as attempted earlier by the authors.

Research Paper

Relationship Between The Optimum Usage Of Copper Slag As Fine Aggregate And Compressive Strength In Copper Slag Admixed Concrete

Binaya Patnaik* , T. Seshadri Sekhar**, P. Srinivasa Rao***
* Research Scholar, Gandhi Institute of Technology and Management University, Hyderabad, India.
** Professor, Department of Civil Engineering, Gandhi Institute of Technology and Management University, Hyderabad, Telengana, India.
*** Professor, Jawaharlal Nehru Technological University, College of Engineering, Hyderabad, Telengana, India.
Patnaik,B., Sekhar,S.T., and Rao,S. (2014). Relationship Between The Optimum Usage Of Copper Slag As Fine Aggregate And Compressive Strength In Copper Slag Admixed Concrete. i-manager’s Journal on Civil Engineering, 4(2), 20-24. https://doi.org/10.26634/jce.4.2.2986

Abstract

The rapid urbanization and natural resources scarcity had created a huge demand for non-conventional resources in the construction industry. Copper slag, which is a by-product obtained during the refining and metal smelting process of Copper Ore having Silica (SiO ) as a major composition, could potentially be used as a partial replacement of Sand in 2 the manufacturing of Concrete. In the present Experimental Investigation, for M30 grade of Concrete, fine aggregate (River Sand) was partially replaced with Copper Slag from 0% to 50% and compressive strength at the ages of 28 & 90 days were investigated. Finally, mathematical equations were derived for compressive strength at 28 & 90 days with percentage of Copper Slag used as partial replacement of Fine aggregate in copper slag admixed concrete.

Review Paper

Hydraulics of Fluid Flow in a Single Cohesive Crack: A Review of Some Basic Concepts

K.K.Pandey* , V.Kumar**
* Associate Professor, Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, India.
** Professor, Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, India.
Pandey.K.K., and Kumar.V. (2014). Hydraulics Of Fluid Flow In A Single Cohesive Crack: A Review Of Some Basic Concepts. i-manager’s Journal on Civil Engineering, 4(2), 25-38. https://doi.org/10.26634/jce.4.2.2987

Abstract

Present review discusses the scope and limitations of basic equations of continuity and momentum used in the study of flow behavior in single crack. The continuity equation for liquid flow used in the literature does not account for source and sink which occurs during crack wall leakages. In two-phase continuity equation, inter-phase transfer terms have been identified to be used as source or sink terms. Navier-Stokes momentum equation and its simplifications under various assumptions, leading to derivations of Stokes and Reynolds equations, and their limitations along with computational difficulty in crack flow problems is discussed. Emergence of Local Cubic Law (LCL) equation and its limitations has been indicated. Validity of LCL equation has been tested in the literatures under the influence of various factors. The relative importance of inertial and viscous forces show that LCL equation is valid for Reynolds number of 10 and a non-linear relation between pressure gradient and volumetric flow rate need to be used when Reynolds number is between 10 and 100. The use of scaling law used in the fracture mechanics shows that in smooth walled fracture, the volumetric flow rate vary with fifth power of crack aperture and so this law is termed as 'quintic' law. There are few published works in literature to study the effect of slip boundary condition in deriving the correction factor in hydraulic conductivity of fracture using Beaver-Joseph slip boundary conditions in case of smooth permeable fracture walls. Some works have shown that formulation of momentum equation for different flow regimes of two phase flow in cracks is a difficult task.