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Item Fast Setting Steel Fibre Geopolymer Mortar Cured Under Ambient Temperature(Springer, 2021) Prasanna, K.M.; Theodose, I.; Shivaprasad, K.N.; Das, B.B.Cement and cementitious materials are being used worldwide as the most popular multipurpose construction materials but the greenhouse gas such as carbon dioxide (CO2) produced during its manufacturing process creating a huge environmental hazard, thus efforts have been made for alternative binders. Geopolymer binder is new age binder alternative to ordinary Portland cement in infrastructure projects because it is produced from eco-friendly and industrial waste materials. This study was aimed to produce fast setting with ground-granulated blast-furnace slag (GGBS) in fly ash-based geopolymer mortar incorporated with steel fibres cured under ambient temperature. In this research, alkaline to binder ratio was varied from 0.5 to 0.8, crimped steel fibre are varied from 0.5 to 1.5% by total volume of binder and combination of fly ash (FA) and GGBS (100%:0%, 90%:10%, 80%:20%, 70%:30%, 60%:40% and 50%:50%) as binder were used for preparation of fibre geopolymer mortar. The tests conducted include stetting time and flowability of geopolymer mortar, compressive strength and microstructural characterisation of steel fibre geopolymer mortar. The tests for compressive strength were carried out on standard size of mortar samples at curing period of 3, 7 and 28 days. It is noted from the test results that increase in GGBS content setting times were decreased; however, the compressive strength of fly ash-based geopolymer mortar increased. The highest compressive strength at 28 days of curing period was found to be 69.5 MPa, which is obtained with content of 1% of steel fibres and alkaline to binder ratio of 0.6 with 50%:50% binder’s proportions. Further, it is observed that the incorporation of steel fibres in plain geopolymer mortar have enhanced the compressive strength and optimum dosage of fibres was found to be 1%. © 2021, Springer Nature Singapore Pte Ltd.Item A Review on Mechanical and Microstructure Properties of Reinforced Concrete Exposed to High Temperatures(Springer, 2021) Goudar, S.K.; Santhosh, S.K.; Das, B.B.This paper presents the recent research progress on the response of concrete exposed to fire or high temperatures. The main highlight of this review paper is a compilation of previously reported data regarding the variations in mechanical properties and microstructure properties of concrete when exposed to high temperatures. The concrete structures get deteriorated at the macro- and microscopic levels due to high-temperature exposure. The macro-level damages can be measured with degradation in mechanical properties such as the reduction in compressive strength, weight loss, changes in elastic properties, reduction of bond strength in reinforced concrete, etc. The macro-cracks on the surface of concrete causes spalling which can be observed after exposing the concrete samples to more than 300 ℃. The compressive strength of the concrete reduces slightly till 400 ℃, and when the temperature increased to 600 ℃, there was an exponential reduction in the compressive strength of concrete. Another important parameter is bond strength degradation, which plays a crucial role in durability issues. To understand the deterioration phenomenon and changes in mechanical properties, the changes at the level of the microstructure of concrete need to be understood. Dehydration of products causes deterioration of mechanical properties and weight loss of concrete when exposed to high temperatures. At different temperatures, the microstructure changes and the response of hydration products such as calcium hydroxide (CH), CSH gel, unhydrated cement and capillary water reported by previous researchers are compiled and discussed. © 2021, Springer Nature Singapore Pte Ltd.Item Characterization of Mechanical and Microstructural Properties of FA and GGBS-Based Geopolymer Mortar Cured in Ambient Condition(Springer, 2021) Prasanna, K.M.; Tamboli, S.; Das, B.B.Fly ash-based geopolymer mortars require heat curing to achieve its properties, which limits its practical application at ambient conditions. The present study was aimed to accomplish the need for application of fly ash-based geopolymers for practical viability without any heat curing by inclusion of ground-granulated blast furnace slag (GGBS). The results revealed that inclusion of GGBS as a partial replacement to fly ash (FA) in geopolymer mortar, which is cured in ambient curing condition, can be able to achieve required setting time and compressive strength. Amalgamation of GGBS with class FA as binder in geopolymerization lend a hand to attain compressive strength as well as setting time which is analogous to ordinary Portland cement (OPC). Microstructural properties were studied using scanning electron microscopy. © 2021, Springer Nature Singapore Pte Ltd.Item Application of Andreassen and Modified Andreassen Model on Cementitious Mixture Design: A Review(Springer, 2021) Snehal, K.; Das, B.B.Cement is a widely used construction material and its consumption on large-scale causes environmental degradation; thus, more emphasis is being given on industrial by-products as alternative materials to cement for their sustainable usage. It is necessary that varying particle size of supplementary cementitious particles is to be used for filling the voids to form a dense particle-packed concrete. The selection of right combination of material is tedious job by trials involving different replacement materials and the resultant concrete may show unexpected results; thus, a more suitable method is the selection of materials based on optimum packing of particles. To select the optimum size of replacement materials particle packing models are essential, so that a low-cement concrete can be prepared which will be ecological as well as economical with improved density, low porosity and high compressive strength. It is found that there are different models have been developed to achieve optimal packing. However, application of Andreassen and modified Andreassen models for the particle packing of multiple ingredients of cementitious matrix found to be largely being accepted by the researchers. This paper reviews the application of Andreassen and modified Andreassen models for the effective particle packing investigations on cementitious particles. It also reviews the software’s employed for designing various cementitious mixtures based on Andreassen and modified Andreassen models. © 2021, Springer Nature Singapore Pte Ltd.Item Phase change materials in buildings: Fundamentals, applications, and future perspectives(IGI Global, 2024) Barbhuiya, S.; Das, B.B.; Adak, D.This chapter thoroughly explores Phase Change Materials (PCMs) and their applications in buildings. It begins by introducing the background, context, and objectives before delving into PCM fundamentals, covering types, phase change mechanisms, and key properties. Beyond theory, the chapter explores practical applications in thermal regulation, energy effciency, HVAC systems, thermal energy storage, passive building design, heat recovery, and PCM integration. Discussion includes various PCM types-organic, inorganic, eutectic mixtures, and bio-based-alongside selection criteria for building applications. Methods to enhance PCM performance, such as nano-enhancements, microencapsulation, and hybrid solutions, are explored. The chapter addresses integration and design considerations and concludes with insights into future directions, trends, and implications for sustainable building practices. © 2025, IGI Global. All rights reserved.Item Artificial Intelligence in Damage Detection of Concrete Structures: Techniques, Integration and Future Directions(Springer Science and Business Media Deutschland GmbH, 2025) Barbhuiya, S.; Das, B.B.The chapter thoroughly explores the pivotal role played by Artificial Intelligence (AI) in the identification of damages in concrete structures. It delves into conventional methods, their limitations, and how AI can effectively complement these approaches. The basics of AI, encompassing machine learning and deep learning, are elucidated within the specific context of damage detection. Additionally, the chapter examines data acquisition and pre-processing techniques tailored for AI models. It sheds light on AI-driven damage detection methodologies, such as the utilization of convolutional neural networks for image analysis, vibration analysis, and AI-enhanced non-destructive testing methods, highlighting their precision in identifying structural issues. Moreover, the chapter investigates the integration of AI into structural health monitoring systems, providing in-depth discussions on data fusion and real-time monitoring. Emphasis is placed on the significance of performance assessment and model validation to ensure the reliability of AI algorithms. The chapter also addresses future trends, including the integration of AI with the Internet of Things (IoT), and delves into ethical considerations in the sphere of infrastructure development. In summary, the chapter underscores AI's transformative potential in revolutionizing damage detection and structural health assessment, contributing to the creation of more resilient and sustainable concrete structures. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.Item Effects of chemical admixtures on the properties of concrete(Elsevier, 2025) Barbhuiya, S.; Das, B.B.; Adak, D.This chapter thoroughly explores the effects of chemical admixtures on cement properties, ultimately enhancing concrete performance. It begins with a foundational overview of cement and its integral relationship with concrete, emphasizing the pivotal role of chemical admixtures. The chapter categorizes these additives based on function, unveiling their primary contributions to cement compositions. This framework sets the stage for a detailed examination of their influence on critical cement properties such as setting time, workability, strength development, durability, permeability, heat of hydration, and alkali-aggregate reactivity. The distinctive roles of specific admixtures like water reducers, retarders, accelerators, and more are elucidated in enhancing cement performance for diverse applications. Precision in admixture usage is underscored through emphasis on dosage optimization, compatibility testing, and rigorous quality control measures, ensuring effective integration and superior cement performance. To conclude, the chapter synthesizes essential insights, summarizing key discoveries, discussing implications, and suggesting valuable research directions. It offers a succinct yet comprehensive understanding of chemical admixtures in cement and their pivotal role in molding concrete attributes. © 2025 Elsevier Ltd. All rights reserved.Item Processing techniques of recycled aggregates(Elsevier, 2025) Trivedi, S.S.; Das, B.B.; Barbhuiya, S.Three essential components of every modern-day growth are preservation of natural aggregate resources, green construction, and the safeguarding of the environment. One such endeavor is the incorporation of recycled aggregate (RA) in concrete. Because of the issues with its strength and durability, the use of RA is typically limited to inferior load constructions. With appropriate management and effective processing methods, the application can be expanded to high-strength concrete. In the present manuscript, the current C&D waste management practices adopted by various nations are highlighted alongside different in-action legislations are thoroughly reviewed for developing an understanding about the basic elements involved in the debris management. In addition, some of the latest and novel recycling approaches are investigated such as autogenous cleaning method, air and hydraulic jigging technologies, and advanced dry recovery system. To investigate the nature of RA processed from aforementioned technologies, the inherent properties of aggregates such as specific gravity, water absorption, density, and abrasion values alongside microstructure performance through scanning electron microscopy (SEM) are comprehensively reviewed and presented. Based on the extensive investigation, it is recognized that effective C&D waste management can be accomplished using certain techniques such as circular procurement and green construction. Furthermore, there is a requirement for specified processing methods that enhances the physio-chemical properties. Also, the surface morphology can be improved using combined crushing and ball milling approaches. Overall, it is recommended to implement vertical shaft crushing and ball milling for the development of fine RA whereas for the coarse RA fractions, multistage jaw crushing and advanced dry recovery (ADR) system are some of the finest processing approaches. © 2025 Elsevier Ltd. All rights reserved.Item Key Variables Influencing the Performance of 3D Printed Concrete: A Comprehensive Analysis(Springer Science+Business Media, 2025) Barbhuiya, S.; Das, B.B.; Adak, D.This chapter examines key variables influencing 3D printed concrete performance, focusing on material, process, environmental, and geometric factors essential for achieving optimal strength and durability. It begins with an overview of 3D printed concrete, performance metrics, and the scope of the study. The chapter then delves into material composition, discussing how cement type, aggregate characteristics, additives, and water-cement ratios affect mix consistency, workability, and structural integrity. Process parameters, such as layer height, print speed, and extrusion rate, are analysed for their impact on layer adhesion and structural stability. Environmental factors—including temperature, humidity, and curing—are examined, highlighting their influence on setting time and strength. Geometric and structural considerations, like wall thickness and layer bonding, reveal the effects of design complexity on stability. The chapter concludes by synthesizing these findings, offering insights into optimizing 3D printed concrete performance through coordinated control of materials, process, and environmental conditions. © 2025 The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.