http://nopr.niscpr.res.in/handle/123456789/61474 Sat, 10 Oct 2026 18:13:52 GMT 2026-10-10T18:13:52Z http://nopr.niscpr.res.in/handle/123456789/63362 Title: Regression and Cluster Analysis of GGBS based geopolymer compositeat different proportion of Ceramic Dust Authors: Parashar, Arun Kumar; Kumar, Ajay; Gupta, Nakul; Saxena, Kuldeep K; Alla, Naveenkrishna; Chandrashekar, Rakesh; Malik, Vinayak; Abduvalieva, Dilsora Abstract: In compare to Portland cement, geopolymer have much lower CO2 emissions, which led to growing interest in their use as an environmentally sustainable binder. The investigation of the strength in compression and durability characteristics of geopolymer composite produced at various calcined clay and ground granulated blast furnace slag (GGBS) proportions (up to 50:50) with 12M of sodium hydroxide and ratio of sodium silicate to sodium hydroxide as 2. The strength of the produced composites was evaluated after 7, 28, 56 and 90 days of ambient air curing. The durability characteristics were evaluated using Rapid Chloride Permeability Test (RCPT), acid and sulfate attack using 5% MgSO4 and 5% H2SO4 solutions respectively and for the integrity using ultrasonic pulse velocity (UPV) test. Test results showed that the developed GPC (Geopolymer composite) has several advantages over standard concrete. The strength in compression (MPa) of the SC100 (standard concrete) as compared to Geopolymer Concrete in Compressive strength was increased by replacing GGBS with calcined clay up to 10%. At 56 and 90 days, the compressive strength of 10% calcined clay samples were improved by 20.15% and 21.60% respectively as compared to the SC100. Correlations showed that strength is having a strong relationship with the chloride ion permeability and the pulse velocities. Page(s): 747-756 Thu, 01 Feb 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/63362 2024-02-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/63361 Title: Progressive Deformation Analysis in Carbon and Glass Fiber Reinforced Hybrid Composites Using Finite Element Method Authors: Prasanthi, Phani; Akkineni, Haritha; Madhav, V V Venu; Gupta, Nakul; Vidya, Ch; Chaitanya, Ch Sri; Saxena, Kuldeep K; Alla, Naveenkrishna; Chandrashekar, Rakesh; Malik, Vinayak; Abduvalieva, Dilsora Abstract: Progressive deformation analysis is a method used to predict the behaviour of composite materials under loading with pre-existing matrix cracks or fiber breakage. It involves the estimation of the gradual deformation of the material, taking into account the material properties, the applied loads, and the associated defect. This paper investigates the fracture behaviour of a carbon-glass fiber-reinforced polymer composite with pre-existing delamination between the layers. Using the finite element technique, the location of delamination and the number of layers in the laminate are investigated to better understand composite material response under the progressive deformation loading. To comprehend the progressive deformation of examined composites under tensile loading, the finite element-based programme Ansys is used. The analytical findings are used to validate the finite element models. For the studied composites with pre-existing cracks, the deformations, forces, equivalent stress, stress intensity factor, and strain energy release rate are given. In this work, the sensitivity of the delamination position on the laminate under progressive deformation loading is found. The current work is used for the effective design of the composite laminate with pre-existing delamination under service loading conditions. Page(s): 757-765 Thu, 01 Feb 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/63361 2024-02-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/63360 Title: Parametric, Mechanical and Metallurgical Characterization of Dissimilar Friction Stir Welded AA2014-AA2219 Authors: Rajagopal, Varthini; Rajendran, Dinesh Kumar; Muthukumaran, S. Abstract: In this study, Friction stir welding (FSW) is carried out on dissimilar aluminium alloys AA2219 and AA2014 using L16 orthogonal array based on Taguchi Mixed Factorial Design (TMFD) under four process variables: traverse speed, rotational speed, tilt angle and tool profile and the effects of FSW parameters on single and multiple responses (Tensile Strength, Yield Strength and Elongation) are analyzed using Response Surface Methodology (RSM) coupled with Augmented Epsilon Constraint Method (AUGMECON). Highest tensile strength and superior percentage elongation are attained at the parameter setting- 1400rpm Rotational Speed, 300mm/min Welding Speed, Tapered Threaded Pin tool profile and 3º Tilt Angle. Maximum yield strength is achieved under the parameter setting 800rpm Rotational Speed, 300mm/min Welding Speed, Tapered Threaded Pin tool and 3º Tilt Angle. A set of 20 optimal Pareto solutions providing a trade-off between the responses was generated. The rotation speed and tool tilt angle determined the trade-off between the extreme Pareto solutions. The microstructural analysis indicates finer grains in the bottom half compared to the top, with improved bonding between AA2219 and AA2014 in the nugget zone. Micro-hardness analysis reveals hardness similar to the parent material in the retreating side and poor hardness in the advancing side, where failures occur. SEM fractography shows a mixed ductile brittle fracture with elongated grains and uniform dispersion of intermetallics. Optimized parameters result in a disk-like planar morphology with a copper-rich GP zone, leading to improved strength and hardness. EDS mapping confirms presence of uniformly dispersed copper particles in the crater region that acts as a binder and resists void formation. XRD analysis further confirms the presence of Al2Cu intermetallic phases. Page(s): 766-779 Thu, 01 Feb 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/63360 2024-02-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/63359 Title: Thermo-Catalytic Conversion of Waste Thermocol and Acrylic to Paint Authors: Hemne, Atul D; kale, Ganesh R Abstract: Waste thermocols and waste acrylic contribute towards environmental pollution due to their non-biodegradability, and improper disposal leads to respiratory and digestive problems in the human beings. This study proposes a thermo-chemical reutilization technique for these materials for the synthesis of paint-solvent. Paint solvents were experimentally synthesized using waste thermocol and spent acrylic via thermo-chemical processing. These solvents were further utilized to form paint with iron oxide and other pigments as pigment and raw thermocol as a binder. FTIR spectroscopy was performed to identify the organic functional groups in the liquid fraction obtained after thermochemical treatment. The liquid fraction obtained after the thermo-chemical treatment was uniformly mixed with a binder and pigment, and the resulting synthesized paint, whose characteristics were compared with those of conventional polystyrene paint. The use of waste thermocol and spent acrylic in the synthesis of paint not only reduces the amount of waste but also has the potential to replace resins and solvents in conventional paints derived from refined crude oil by products. This study provides a promising solution to this waste management problem and highlights the potential use of waste materials in paint synthesis. Page(s): 780-787 Thu, 01 Feb 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/63359 2024-02-01T00:00:00Z