Papers by Dr. Rahul V Ralegaonkar
An assessment of workability, mechanical and durability properties of high-strength concrete incorporating nano-silica and recycled E-waste materials
Beni-Seuf University Journal of Basic and Applied Sciences /Beni-Suef University Journal of Basic and Applied Sciences, Jul 2, 2024
Construction and Building Materials, Feb 1, 2012
Recycle paper mills (RPM) contribute 30% of total pulp and paper mill segment in India. With 85% ... more Recycle paper mills (RPM) contribute 30% of total pulp and paper mill segment in India. With 85% average efficiency of RPM, 5% waste (RPMW) is produced annually. RPMW which otherwise is land filled has been utilized to make construction bricks that serves a purpose of solid waste management, new revenue generation and earning carbon credits. RPMW-cement combination low carbon foot print bricks with varying composition of cement (0-20% wt) have been prepared and tested as per ASTM C 67-03a standards. RPMW has been characterized using X-ray fluorescence (XRF), thermogravimetric and differential thermal analysis (TG-DTA), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). TG-DTA confirms thermal stability till 280°C whereas SEM monographs show the pores and fibrous nature. From experimentation it is observed that waste-create bricks (WCB) prepared using RPMW-cement combination is light weight, shock absorbing and meets compressive strength requirements of ASTM C 67-03a. The brick making procedure being simple can be undertaken as rural entrepreneurship by unskilled labors of developing countries.
Design and Development of Sustainable Alkali-Activated Bricks
Social Science Research Network, Jun 7, 2019
Techno-Economic Analysis of Sustainable Energy Management Techniques – A Case Study
International journal of engineering trends and technology, Nov 25, 2018
Effect of cupola slag as a coarse aggregate on compressive strength of concrete
Materials Today: Proceedings
Development of bio-based blended ash and fly ash based alkali activated concrete
Magazine of Concrete Research
Due to rapid industrialization and urbanization there is a significant increase in manufacturing ... more Due to rapid industrialization and urbanization there is a significant increase in manufacturing & application of cement which resulted in high CO2 emissions into atmosphere. This leads to investigate alternative binder with reduced CO2 emissions and better performance. The manuscript elaborates the mix design of novel concrete, wherein the principle raw material used was locally available bio-based Blended Ash (BA) procured from co-combustion process with sodium based alkali activators. Physical, chemical, mineral and morphological characteristics of BA were studied. Beside this, investigation of the influence of parameters such as molarity of sodium hydroxide (NaOH), liquid sodium silicate (LSS) to NaOH ratio, fly-ash (FA) to bio-based blended ash (BA) ratio and method of curing on physico-mechanical properties of alkali-activated concrete for sustainable construction material were studied. Higher characteristic strength was attained with increase in these parameters. Maximum char...
Energies
Rapid construction with an energy-efficient approach is a major challenge in the present construc... more Rapid construction with an energy-efficient approach is a major challenge in the present construction industry. Cement, a carbon-intensive material, is mainly used in the construction industry and hence increases the sector’s carbon footprint on the environment. The current review focuses on the study of 3D concrete printing (3DCP), in which cement is partially replaced with industrial byproducts such as ground granulated blast furnace slag (GGBS), fly ash, and silica fume. Walling material is primarily targeted in 3DCP. There is a need to include energy efficiency to achieve a thermally comfortable environment. The life cycle assessment (LCA) of concrete is studied to discover the potential conflicts affecting the environment. The sand-to-binder ratio is pivotal in determining the performance of concrete. The content of the supplements is decided based on this factor. The rheological, physical, and mechanical properties of 3DCP are studied further and analysed. GGBS demonstrates be...
Energies
The construction world has changed day by day and is becoming more digitalized by introducing new... more The construction world has changed day by day and is becoming more digitalized by introducing new technologies. Three-dimensional concrete printing (3DCP) is one such technology that has automated building process along with several benefits such as reduced material waste, reduced human hazard, and time savings. Traditionally, this technique utilizes cement to construct numerous structures, resulting in a significant carbon footprint and negative environmental impact. There is a need to find alternate solutions to reduce cement consumption. Alkali activation technology has replaced cement completely. The scope of development of alkali-activated 3D printable concrete utilizing agro-industrial byproducts is presented in this study. A review of the fresh and hardened properties of alkali-activated 3D printable concrete was the primary objective. The change in properties of 3D concrete mixes with the variation of additives that influence the ultimate strength parameters is presented. Th...
Application of sustainable prefab walling panels in erection of a toilet unit at a rural village
Materials Today: Proceedings
Buildings
India is in need of rapid construction technology with sustainability and environmentally friendl... more India is in need of rapid construction technology with sustainability and environmentally friendly aspects. Prefabrication is a well-known technique that lowers carbon emissions and reduces environmental impacts. Life cycle assessment (LCA) evaluates these impacts of developed product/process. A new-age construction product was designed from a locally available agro-industrial waste called co-fired ash (CFA). Expanded polystyrene beads, fly ash, and crushed sand were also used in designing lightweight (LW) sustainable prefabricated panels. The effect of incorporating sustainable alternates into the mix designs is to be studied. An experimental small-scale model house was erected and LCA for the same was carried out with cradle-to-site approach. Based on the inventory, the environmental impact was assessed for four different indicators: acidification potential (AP), eutrophication potential (EP), global warming potential (GWP), and ozone depletion potential (ODP) were evaluated. Carb...
Cleaner production of geopolymer materials: A critical review of waste-derived activators
Materials Today: Proceedings
Buildings
This paper reported on the micro-level properties of alkali-activated pastes cured in ambient con... more This paper reported on the micro-level properties of alkali-activated pastes cured in ambient conditions. The mechanisms influencing setting time and the microstructure development of fly ash, slag, and metakaolin were studied. The mortar compressive strength of the binders and their ultrasonic pulse velocity (UPV) were tested after 56 days of ambient curing. The micro-level properties of paste cured at ambient conditions for seven days were determined to understand the phases developed. NASH gel was observed to delay setting and possessed lower compressive strength, while CASH gel was set early and possessed high compressive strength. The micro-characterisation of the alkali-activated binder system developed with fly ash and metakaolin showed the presence of NASH gel. The alkali-activated binder system developed with GGBS contained multiple gels, such as N, C-ASH, and CSH. The molecular structures of CSH, CASH, NASH, and N, C-ASH are also presented and were obtained using high scor...
Energies
Economic growth and rapid urbanization have resulted in the increase in demand for infrastructure... more Economic growth and rapid urbanization have resulted in the increase in demand for infrastructure development. To meet this ever increasing demand, conventional construction materials such as concrete are used, which requires an energy intensive process that in turn impacts the environment adversely. Ordinary Portland Cement, being the dominant binder in the industry, contributes around 8% of worldwide annual carbon emissions, and this is expected to reach around 20% by 2050. Population growth has resulted in the significant increase in agro-industrial waste generation during recent years. Inadequate waste management raises a number of environmental concerns. With the growing economy and rising living standards, global raw material consumption is expected to double by 2060. The reutilization of waste materials will aid in their management, while conserving the available resources. Alkali-activated materials (AAM) have recently been introduced as an eco-friendly alternative to conven...
Buildings
The increasing urban population requires rapid housing construction. Rising global temperatures h... more The increasing urban population requires rapid housing construction. Rising global temperatures have led to more space cooling options inside buildings. There is a need to design new-age buildings with a sustainable, thermal comfort, and energy-efficiency approach. The present work integrates this approach into the design of prefabricated elements. Locally available co-fired ash, along with other sustainable alternates, are used in developing these elements. This study involves a performance evaluation and feasibility assessment of the proposed prefabricated system. A small-scale model house of one-third size is constructed using these elements for the purpose of functional evaluation. An average temperature variation of approximately 4 °C is observed upon comparison with the fly-ash brick model during the peak summer season. During energy assessment, a 12% and 52% decrease in embodied energy and peak cooling loads were observed. The time study resulted in 20% time savings over the ...
Energies
The construction industry has experienced phenomenal growth because of technological advancements... more The construction industry has experienced phenomenal growth because of technological advancements in the past couple of decades. Prefabrication constitutes a sizeable share of this industry and is being adopted all over the world. The method of casting construction elements in a controlled environment and assembling them on-site has revolutionised the industry. Research on various aspects of the technology is ongoing around the world, and an impressive number of articles have been published. However, the prefab technology, materials used, and terminology have varied across locations, which may have hindered the method’s wider acceptability. By evaluating technical articles published between 1991 and 2022, this report analyses the present body of knowledge regarding prefab technology, its evolution, sustainability, and stakeholder views. This technology effectively contributes around 40% in time saving, 27% in cost reduction, 30% in reduced carbon emissions, and 84% in on-site wastag...
Proceedings of the Institution of Civil Engineers, Apr 5, 2022
The version presented here may differ from the published version or from the version of the recor... more The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.
Feasibility Analysis of Carbon Equivalence Accounting for Construction Materials Using Computational Approach
Urbanization Challenges in Emerging Economies
Advances in Civil Engineering
This study investigates the pozzolanic potential of industrial waste, which fails to meet the che... more This study investigates the pozzolanic potential of industrial waste, which fails to meet the chemical composition as defined by the various international standards, e.g., IS: 3812 (Part 1): 2017 and ASTM C618-19 to adopt as a supplementary cementitious material. The effects of mechanical nanoprocessing on pozzolanic reaction efficiency, impact on energy efficiency, and construction affordability were studied. The result of mechanical milling shows the improvement in pozzolanicity, and the physicomechanical characteristics of novel concrete incorporated with identified industrial waste are comparable with control concrete. The building energy simulation was carried out using the BIM software for the house, modelled with controlled concrete, and novel concrete incorporating the identified milled industrial waste. The peak cooling load and building material cost of a novel concrete model house were 34% and 9.09% less than the conventional concrete. The study reveals that the chemical ...
Improving Thermal Resistance of Walling Material Using AAC Residue
Social Science Research Network, Jun 13, 2019
Building Information Modelling (BIM) Based Energy Efficient Buildings
Social Science Research Network, Jun 7, 2019
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Papers by Dr. Rahul V Ralegaonkar