Browsing by Author "Rath, Badrinarayan"

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Eco-friendly innovations in flexural performance of LC3 concrete: Utilizing sugarcane bagasse ash and rubber latex for enhanced sustainability in carbonated industrial environments
(Elsevier BV, 2025-03-25) Rath, Badrinarayan
The impact of global warming on the construction sector is a critical concern in today’s world, largely attributed to the emission of greenhouse gases during the production of Portland cement. Cement plays a vital role in civil infrastructure due to its numerous advantages; however, its production significantly contributes to global warming and poses the risk of raw material depletion. To mitigate the over exploitation of natural resources, Limestone Calcined Clay Cement (LC3) has emerged as a sustainable alternative that helps preserve the ecosystem. On the other hand, CO 2 emissions from industries adversely affect surrounding structural buildings, primarily through carbonation. In this study, LC3 concrete was developed by limiting cement content to 33 % of the total binding content of concrete. Calcined clay was partially replaced with sugarcane bagasse ash at levels of up to 40 %, while water was partially replaced with rubber latex at up to 5 %. Twenty LC3 concrete beams were modeled using a binary combination of bagasse ash and rubber latex in ABAQUS under carbonation conditions with CO 2 concentrations of 5 % and 10 %. The flexural behavior of these carbonated concrete beams was simulated, and key structural parameters, including flexural strength, deflection, flexural rigidity, crack propagation, and stress block distribution were analyzed. The results revealed that replacing 30 % of calcined clay with bagasse ash and 5 % of water with rubber latex provided the best combination for sustainable construction in industrial environments, offering improved performance and reduced environmental impact. LC3 concrete improved with sugarcane bagasse ash and rubber latex under carbonation. Promotes waste recycling into concrete, aligning with circular economy and sustainability goals. Rubber latex enhances ductility, transforming shear cracks into minor flexural cracks. Optimum results were achieved with 30 % bagasse ash and 5 % rubber latex replacements.
Fracture and stability analysis of knee-braced column footings under eccentric loading using finite element modelling
(Taylor & Francis, 2026-02-04) Rath, Badrinarayan
In conventional structural design, columns are typically placed at the center of footings to ensure symmetrical load distribution and structural stability. However, architectural constraints often require eccentric placement along the edge mid-length, mid-breadth, or corner resulting in biaxial loading and non-uniform stress distribution. This study investigates the seismic behavior of a G + 7 framed structure (an eight-storey reinforced concrete frame comprising ground plus seven floors) simulated in ABAQUS, analyzing 250 mm × 250 mm columns positioned on 900 mm × 900 mm footings in four locations. Inclined knee bracings at 0°, 30°, 45°, and 60° were implemented to enhance lateral and rotational resistance. The number of bracings varied by column position: four for centrally placed columns, three for edge-mid, and two for corner placements. Fracture mechanics methods stress intensity factor and fatigue life analysis were used to evaluate crack propagation and failure modes. While central columns demonstrated better uniaxial load performance, inclined bracing significantly enhanced the seismic resilience of eccentric layouts, increasing critical rocking angles by up to 12%. Nonlinear dynamic analyses and fragility curves quantified the probability of exceedance, offering probabilistic insights into the vulnerability of 16 column–footing configurations.
Sustainable LC3 Concrete in the Circular Economy: Assessment of Mechanical, Microstructural, and Durability Characteristics with Surkhi, Metakaolin, Nano‐Silica, and M‐Sand Blended Concrete
(Wiley, 2025-04-10) Rath, Badrinarayan
Researchers are increasingly focused on eco-friendly concrete with reduced carbon footprints. Among sustainable options, Limestone Calcined Clay Cement (LC3) concrete offers enhanced strength and durability with lower greenhouse gas emissions. This study evaluates the mechanical, microstructural, and durability characteristics of LC3 concrete modified with surkhi and nano-silica as cementitious materials, replacing metakaolin and gypsum. Surkhi and nano-silica are varied from 0%-40% and 0%-4%, respectively, while fine aggregate is completely replaced with M-sand to improve packing density. Ten M30-grade concrete mixes are analyzed after 28 and 90 days of curing. By incorporating surkhi and nano-silica as partial replacements for metakaolin and gypsum in LC3 concrete, the research investigates potential improvements in strength, durability, and microstructural integrity of the concrete and provides lower greenhouse gas emissions compared to traditional Portland cement. Results revealed that surkhi and nano-silica significantly improved strength and microstructure, with surkhi optimally limited to 30%. M-sand proved effective in enhancing durability against weathering. These findings position modified LC3 concrete as a sustainable alternative, offering improved performance and advancing its potential within the circular economy framework.