Journal of Civil and Mechanical Engineering

The work under review looks at properties of concrete in rigid pavements when cement is semi-replaced with ground granulated blast furnace slag (GGBs). The primary objective will be enhanced sustainability achieved by utilizing less cement and reducing associated CO2 pollution. The compressive strength, flexural strength and the durability was tested of some concrete mix that had different proportions of replacement of GGBS. The results show that GGBS can reduce the strength slightly during the young age but is much stronger and more durable over time. To have an optimal performance and environmental trade-off, the level of replacing was calculated as between 30 to 40 percent. Based on the findings of the study, GGBS can serve as an effective components of firm pavement concrete application, and can contribute to long-term sustainable environmentally friendly infrastructure.

Keywords : Workability, GGBS, Flexural, Compressive, Split Tensile Quality

Author : K Suresh Naik

Title : Properties of Concrete in Rigid Pavements with GGBS Used in Part to Replace Cement

Volume/Issue : 2025;01(01)

Page No : 01-04

This work analyses the mechanical characteristics of coir fiber reinforced bituminous mixes, which is a bionatural product. Various quantities of coir fiber were applied to determine its effect in stability, flow, Marshall properties and moisture susceptibility. Based on research, the coir fiber enhances the tensile strength, durability and resistance to deformation of the bituminous mix. Workability is not compromised as performance is maximized by the ideal composition of fibers. This paper will illustrate how coir fiber can become an ecologically safe additive to enhance the mechanical characteristics of the bituminous pavements and aid in creating a sustainably constructed road.

Keywords : Bituminous blend, Waste fiber, Regular filaments

Author : K Rohit Kumar

Title : Mechanical Characteristics of Bituminous Mixtures Reinforced with Coir Fiber

Volume/Issue : 2025;01(01)

Page No : 05-08

This study examines the mechanical characteristics of concrete whereby the part of the cements has been replaced by metakaolin. Various proportions of metakaolin, highly reactive pozzolanic material, formed by calcining kaolinite clay, were added by weight as: 5, 10 and 20% by weight of cement to concrete mixtures. The primary subjects of the study were the compressive, split tensile and flexural strengths in different ages of curing. Based on the findings, metakaolin enhances the microstructure and reduces the content of calcium hydroxide of concrete, which is stronger and durable, most particularly when replaced by 10 to 15% of metakaolin. To some extent, strength had a negative correlation with the level of replacement. With reduced amounts of cement and enhanced cement, it can be seen that metakaolin is helpful supplementary cementitious materials that lead to sustainable construction activities.

Keywords : Compressive strength, Split tensile strength, Flexural strength, Metakaolin, Concrete mix

Author : B Niharika

Title : Mechanical Characteristics of Metakaolin Used in Concrete to Replace Part of the Cement

Volume/Issue : 2025;01(01)

Page No : 09-13

Because power diodes are important in power electronics, this research explores how high temperatures and radiation impact their operation. A main aim of the analysis is to study forward voltage drop, reverse leakage current and switching characteristics from various radiation and temperature situations. Both simulation and experiments reveal that radiation can deteriorate how long diodes function and how effective they are, while rising temperatures raise leakage and drop break downlinking voltage, understanding these effects is necessary to improve the reliability and working life of power diodes in space, nuclear and aerospace environments.

Keywords : Electrical properties, Diffusion length, Silicon diodes, Physical radiation effects, Radiation effects, P-N junctions, Semiconductor diodes

Author : K Suresh Reddy

Title : Temperature and Radiation-Related Power Diode

Volume/Issue : 2025;01(01)

Page No : 14-17

The Bearingless Permanent Magnet Synchronous Motor (BPMSM) is able to function without bearings because it combines magnetic levitation with torque generation. Using this motor design, equipment can function faster, produce fewer sounds and frictional forces and be maintained less frequently while becoming more reliable. During accurate control and steady rotor suspension, BPMSMs depend on a combination of radial and levitation windings. They are used in precision equipment, tools for medicine and airplanes mostly because they are not too big and are very effective. The purpose of ongoing research is to optimize the actions, robustness and use of power in current drive systems by improving control and the design of their magnets.

Keywords : Self-bearing, Bearingless motor, Mathematical model, Finite Element Method, Permanent magnet synchronous motor

Author : K Keshav and M Santha Ram

Title : Bearingless Permanent Magnet Synchronous Motor

Volume/Issue : 2025;01(01)

Page No : 18-22

A high gain DC-DC converter designed for automotive applications is presented in this study. In these applications, voltage step-up is essential for supplying power to high-voltage systems from a low-voltage battery source. In order to achieve high voltage conversion efficiency while preserving dependability and compact size, the suggested converter incorporates cutting-edge topologies such linked inductors, switching capacitors, and active clamping. Minimal component stress, lower switching losses, and better thermal management are all guaranteed by the design. The converter's performance under various load conditions is validated by simulation and experimental findings, which makes it appropriate for use in electric and hybrid vehicles. This work helps the changing car industry find economical and energy-efficient power solutions.

Keywords : High gain, Clamp circuit, Automotive Applications, DC-DC converter, HID lamps

Author : K Vamsi Varma

Title : High Gain DC-DC Converter for Use in Automobiles

Volume/Issue : 2025;01(01)

Page No : 23-26