Subhashish Dey Books

The book explores innovative bio-sorption methods for removing Sulphur and fluoride from contaminated water using natural materials like neem leaves, custard apple leaves, mango leaves, orange peels, and banana peels. It highlights the shortcomings of conventional treatment methods, such as high costs and inefficiencies at low concentrations, and emphasizes the eco-friendly advantages of bio-sorption. The study demonstrates a remarkable 100% removal efficiency and examines various parameters affecting the process, making it a significant contribution to sustainable water treatment solutions.

The quality of water used in mixing and curing concrete or mortar is crucial, as it can significantly affect the hardening and strength development of the material. While it is commonly believed that potable water is suitable for this purpose, exceptions exist where drinking water may not be appropriate for concrete, and vice versa. The text emphasizes the need for stringent quality control of water, referencing standards such as British Standards, ASTM, and Indian Standards to ensure compliance and suitability for construction use.

Focusing on the challenges faced by high-rise buildings, this book explores the impact of wind and earthquake loadings on structural safety. It examines the interactions between reinforced concrete components, including beams, slabs, columns, and walls, under various loads. The analysis emphasizes the often-overlooked effects of foundation types and soil properties, particularly in clay and soft rock environments. By integrating these factors, the book aims to enhance understanding of structural resilience and the complexities of effective design in dynamic conditions.

The book explores the increasing use of high-strength concrete (HSC) and its implications for building design, emphasizing the benefits of reduced dead weight and enhanced usable space. It addresses the brittleness of HSC, highlighting the need for a balance between strength and ductility, which can be achieved by incorporating steel fibers. Additionally, it discusses the optimal use of industrial waste materials, such as fly ash and silica fume, to improve concrete properties, demonstrating significant gains in compressive and tensile strengths with specific fiber ratios.

The investigation explores the use of Geopolymer as an alternative binder in concrete to address rising cement costs and its high carbon emissions. By completely replacing cement with a mix of fly ash, Ground Granulated Blast-Furnace Slag (GGBS), and waste glass, the study aims to create a sustainable concrete solution that can be cured at ambient temperatures. The research focuses on developing a mix design for G40 Tertiary Blended Geopolymer concrete, examining its mechanical and durability properties while utilizing sodium hydroxide and sodium silicate as activators.

The book explores the innovative use of industrial waste materials in the production of eco-friendly bricks in India. By incorporating by-products like fly ash, quarry dust, and various powders, the study aims to reduce environmental impact and reliance on natural resources. It highlights the benefits of creating green bricks, including cost reduction, energy savings, and improved strength. The research addresses the environmental issues caused by traditional brick-making methods and presents experimental findings on the effectiveness of these alternative materials in construction.

The focus of this book is on the modification of clayey soil to enhance its suitability as subgrade material for pavements. Due to its low shear strength and high compressibility, traditional clay cannot meet necessary standards. The author explores the use of fly ash as an admixture for soil stabilization, examining its effectiveness during the curing period. This study highlights the potential of fly ash not only as a substitute for cement in concrete but also as a means to improve the properties of clayey soil for construction purposes.

The study focuses on the seismic response of multi-storied buildings situated on hilly slopes, specifically analyzing structures with a stepped back configuration. It examines how these buildings, resting on slopes of 15°, 30°, and 45°, behave during earthquakes, contrasting their dynamic responses—such as natural frequencies, time periods, base shears, and displacements—with similar buildings on flat terrain. The research utilizes STAAD Pro software for simulations and compares the findings with manual calculations, highlighting the impact of topography on structural integrity during seismic events.

The study investigates the impact of non-biodegradable organic solids (NBOS) in mixing water on cement mortar, addressing a gap in existing standards that do not specify limits for NBOS. Through laboratory experiments, it was found that a concentration of 500 mg/L of NBOS resulted in a compressive strength of 55.65 MPa, slightly higher than that of reference samples mixed with rainwater. Additionally, the initial and final setting times increased by 43 and 28 minutes, respectively, compared to the reference cement, highlighting the significant effects of NBOS on cement properties.

The research explores the innovative use of solid plastic waste as a partial replacement for fine aggregate in concrete, aiming to address environmental concerns associated with increasing plastic waste. By incorporating varying percentages of plastic waste (0%, 10%, 20%, 30%, and 40%) into M40 concrete mix designs, the study assesses the compressive, tensile, and flexural strength of the resulting lightweight concrete. Findings indicate potential benefits in recycling and reusing plastic waste, while also providing insights into the durability of the material over time.