Evaluation of Rutting Characteristics on Warm Mix Asphalt with Inclusion of Fibers

Vol. 3  Issue 3
Year: 2015
Issue:Oct-Dec
Title:Evaluation of Rutting Characteristics on Warm Mix Asphalt with Inclusion of Fibers
Author Name:G.Sharanya, T.Naga Teja and A.Ramesh
Synopsis:
Bituminous pavements are commonly used for construction of roads in our country. Hot Mix Asphalt (HMA) is majorly adopted in the preparation of bituminous mixes. HMA releases harmful gases and pollutes the environment. Several techniques have been developed for reducing the mixing and compaction temperatures of HMA. One of the techniques is named as Warm Mix Asphalt (WMA) for reduction in mixing temperature. WMA mixes contribute for cost savings in operation of bitumen plants through reduction in energy costs. Pavement deformation is the major problem and is observed on high volume bituminous roads. Many researchers have given their contribution for improving the pavement life for the cause rutting failure. An attempt has been made for improving the rutting characteristics obtained with the addition of Polyester (PE) fibers, at regular intervals. Parameters such as bulk density, Voids in Mineral Aggregate (VMA), Void Filled with Bitumen (VFB), air voids, flow and stability were determined as per ASTM D 1559 and Optimum Binder Content (OBC) was determined as per Ministry of Road Transport and Highway (MoRTH) 5th revision 2013 guidelines. WMA prepared with bituminous concrete grade – I (MoRTH) was considered for the study and was modified with Polyester (PE) fibers. Performance characteristics of PE modified mix are carried with immersion type of wheel tracking device for evaluation of rut depth. It is observed from the results that, WMA provides lower rut depth with increase in PE fiber content at optimum content when compared with conventional WMA mix.

Determination of Optimum Post Weld Heat Treatment Processes on the Microstructure and Mechanical Properties of IS2062 Steel Weldments

Vol. 3  Issue 3
Year: 2015
Issue:Oct-Dec
Title:Determination of Optimum Post Weld Heat Treatment Processes on the Microstructure and Mechanical Properties of IS2062 Steel Weldments
Author Name:M.Bala Chennaiah, P.Nanda Kumar and K.Prahlada Rao
Synopsis:
In this investigation, the effect of post heat treatment on the microstructure and mechanical properties of IS2062 steel are analyzed. Similar metal joints of IS2062 weldments are prepared by using MIG (Metal Inert Gas) welding process. This melting is occurring at the edges of the plates because, sufficient amount of heat energy is passing over the plate per unit time and density of energy is supplied to the wire. In this connection of heating and cooling of weldment, some disturbances occur in metallurgical and mechanical point of view. To overcome this, a suitable PWHT (Post Weld Heat Treatment) is applied to avoid the disturbances and improve the mechanical and microstuctre of the weldment. The objective is to determine the optimum PWHT method for the IS2062 steel. After welding, the effects of PWHT on weld metal microstructure and mechanical properties including weldment tensile strength, impact and hardness over the room temperature range of 32oC are investigated. In particular, the effect of these treatments on the Tensile strength, Impact, Hardness of the materials and weldments before heat treatment and after PWHT are studied.

Effects of Polyaniline Filler on the Shear Strength of Silver-Polyaniline-Epoxy Adhesive

Vol. 3  Issue 3
Year: 2015
Issue:Oct-Dec
Title:Effects of Polyaniline Filler on the Shear Strength of Silver-Polyaniline-Epoxy Adhesive
Author Name:Tanyaradzwa S. Muzata and Tafadzwa Ziyambi
Synopsis:
Electrically Conductive Adhesives (ECAs) are widely applied in electronic packaging such as solder less interconnections, heat dissipation and component repair. This research focuses on the effects of polyaniline filler percentage in the silver-polyaniline epoxy conductive adhesive. Conductive adhesives with different polyaniline filler concentrations were prepared, so as to check on how the different filler concentrations affect the shear strength of the ECAs. Silver concentration was kept constant, but the polyaniline concentration was varied between 3-10%. The shear strength of the adhesive was measured using the universal tensile machine and the results showed that, more the filler loading is increased, less the adhesive strength exhibited by the composite. The research also shows the synthesis of the main filler silver particles by chemical reduction method and also the synthesis of the co-filler polyaniline by chemical method and both UV (Ultraviolet) and SEM (Scanning Electron Microscope) characterizations were conducted.

Oxidation Stability of Fuels Derived from Oils: A Review

Vol. 3  Issue 2
Year: 2015
Issue:Jul-Sep
Title:Oxidation Stability of Fuels Derived from Oils: A Review
Author Name:Amit Sarin, Meetu Singh and Neerja
Synopsis:
The price and uncertainties in the availability of traditional fuel availability is rising continuously, hence there is renewed interest in fuels from edible and non edible oils for diesel engines. Fuels synthesized from vegetable oils, animal fats and used cooking oils are considered as renewable substitutes for fossil fuels, due to their environmental values. These fuels consist of Fatty Acid Monoalkyl Esters (FAME). Oxidation of fuels from oils gives products that degrade the quality of fuels because fatty acid derivatives are more sensitive to oxidative degradation than mineral fuels. Thus, oxidation stability is a prime factor during the storage of such fuels. The present paper is an overview of the work done by different researchers on the oxidation stability of such fuels.

A Study on the Residual Stresses in Resistance Spot Welding

Vol. 3  Issue 2
Year: 2015
Issue:Jul-Sep
Title:A Study on the Residual Stresses in Resistance Spot Welding
Author Name:Y.Rihan, S.Ayyad and M.I.Elamy
Synopsis:
Spot-welded joints are widely used in industries. A simplified structural model is proposed in this paper to study the residual stresses in spot-welded joints. The current paper describes the influence of the weld parameters on the residual stresses of resistance spot welds on 304 type stainless steel sheets. Various loading conditions and joint parameters are considered. It is found that the increase of both weld current and weld time decreases the residual stresses, and the increase of electrode force decreases the residual stresses. The nugget diameter increases continuously with weld current.

Electrical Properties of Nanocomposite Polymer Gels based on PMMA-DMA/DMC-LiCLO2 -SiO2

Vol. 3  Issue 2
Year: 2015
Issue:Jul-Sep
Title:Electrical Properties of Nanocomposite Polymer Gels based on PMMA-DMA/DMC-LiCLO2 -SiO2
Author Name:Rajiv Kumar
Synopsis:

Nanocomposite Polymer Gels (NCPG) composed of Polymethylmethacrylate (PMMA), Lithium Perchlorate (LiClO4), Dimethylacetamide (DMA), Dimethyl carbonate (DMC) and Nano sized fumed silica (SiO2) were prepared to improve the ionic conductivity and mechanical stability of solid state electrolytes. The increase in conductivity with the polymer addition has been explained to be due to the dissociation of undissociated salt present in the electrolytes. With the addition of nano-sized fumed silica (SiO2 ) to the gels, the ionic conductivity further increased which has been explained on the basis of double percolation threshold model. The dependence of conductivity of NCPGs on temperature was also measured, and a maximum room temperature conductivity of 2.45×10-2 S cm-1was obtained for electrolytes composed of DMA+0.5M LiClO4 + 10 wt% PMMA + 8 wt% SiO2 . The effect of dielectric constant of solvent has also been studied. The conductivity of composite gels does not show much change over 20-1000 C temperature range and also remains constant with time which is suitable for their use as electrolytes in various devices like solid state lithium ion batteries, electrochemical display devices, electrochemical sensors etc.

Development of Whiteware Bodies using China Clay from Selected Deposits in Edo and Ekiti States of Nigeria

Vol. 3  Issue 2
Year: 2015
Issue:Jul-Sep
Title:Development of Whiteware Bodies using China Clay from Selected Deposits in Edo and Ekiti States of Nigeria
Author Name:Ogundare Toluwalope, Fatile Babajide Oluwagbenga and Lamidi Yinusa Daniel 
Synopsis:

Ceramic whitewares practically signify vitreous or glassy elements which are usually formed from a mixture of China Clay, ball clay, quartz and feldspar milled to their possible finest particles and fired to form a ceramic compound. Ceramic whitewares are generally associated with some tremendous technical properties which make them applicable in nearly all fields of life. These admirable properties are usually a function of the China Clay present in the composition which varies respectively with their geological deposits, and furthermore affects the mechanical and physical properties of the composed whiteware. This research is therefore aimed at studying the variation of China Clay deposits and their effect in technical properties of ceramic whiteware compositions, for the production of ceramic whitewares. This was carried out by substituting China Clay of different deposits in a standard whiteware composition which was later fired at different temperatures of 1050oC, 1150oC, 1200oC and 1250oC respectively with a soaking time of 1 hour.