Experimental study on chemical resilience of glass reinforced polymer pipes for sewage applications Priyank Upadhyaya, Vijay Lakshmi Mishra, Devanand Chelot International Journal of Nanoelectronics and Materials, 2025 A comprehensive understanding of composite pipe corrosion behavior is essential due to their exposure to diverse chemical environments. This study examines Glass Reinforced Plastic (GRP) composites, commonly employed in underground construction and industrial applications, with a particular emphasis on the rehabilitation of aging sewage pipelines. The investigation focuses on assessing the chemical durability of a multi-layer GRP material reinforced with polyester resin. The chemical resistance of individual layers and the composite as a whole are evaluated before and after immersion in various chemicals for periods of 30, 60, 90, and 180 days. The chemical environments are designed to replicate in-service conditions, including exposure to Sulphuric acid (H₂SO₄), Sodium hypochlorite (NaClO), Methyl ethyl ketone peroxide (MEKP), distilled water, Sodium chloride (NaCl), Propanone (C₃H₆O), Cobalt Octate, and Dimethylacetamide (DMA). Mass loss measurements are used to evaluate changes in chemical composition. The observations from this study assist in estimating the long-term structural health of composite pipes exposed to harsh chemicals found in sewage water.
A Sustainable Solution with Improved Chemical Resilience Using Repurposed Glass Fibers for Sewage Rehabilitation Pipes Devanand Chelot, Shivnarain Ravichandran, Priyank Upadhyaya Recycling, 2024 This paper introduces a sustainable sewage rehabilitation solution, utilizing repurposed glass fibers for enhanced chemical resilience and environmental conservation. The approach involves dividing a unitary pipe into segments, assembled during commissioning, aiming to reduce installation and transportation costs, particularly in less accessible areas. Each pipe segment comprises a multi-layered glass fiber composite sandwich, joined by an adhesive reinforced with recycled glass fibers. The glass fiber-reinforced plastic (GFRP) pipe features a core of blended sand impregnated with resin, an outer layer for impact resistance, and an inner layer to prevent corrosion. Chemical resilience is assessed through a 10,000 h strain corrosion study exposing both unitary and two-piece circular GFRP pipes to sulfuric acid in a deflected condition. An apparent hoop tensile test evaluates mechanical integrity before and after exposure. The experimental results reveal that the two-piece pipe with a tongue and groove joint (TGJ) with recycled glass fiber adhesive exhibits superior long-term bending stress and failure strain % compared to unitary pipes. This enhancement is attributed to the TGJ’s improved load-bearing capability and chemical resistance. The failure strain % of the two-piece pipe (1.697%) is higher compared to the unitary pipe (1.2613%). The long-term bending stress of the two-piece pipe obtained is 119.94 MPa whereas the unitary pipe reaches 93.48 MPa at the 50-year mark. The cost analysis supports the adoption of the two-piece pipe over unitary pipes due to a 40% reduction in carbon emissions and transportation cost. The novelty lies in the utilization of multi-piece pipes with enhanced chemical resilience, achieved through the incorporation of milled fiberglass reinforcements in the TGJ. Strain corrosion tests take a long time to perform; hence, an accelerated test is needed to improve the current recommended testing standard.
Enhanced strength and toughness of repurposed glass fiber reinforced adhesive joints for sewage applications Devanand Chelot, Abhishek Tewari, Kumar Shanmugam, Priyank Upadhyaya Journal of Adhesion, 2024 In this study, the enhancement in strength and toughness of multi-piece glass fiber reinforced plastic (GFRP)/GFRP joints was demonstrated. These joints are bonded with repurposed short glass fiber reinforced adhesive and find their application in rehabilitation of sewage pipelines. These short fibers were produced by grinding and milling the fiberglass wastes, collected during the lamination process of pipes. To study the effect of glass fiber content on the mechanical properties of the composite adhesive, short fiber composite (SFC) specimens with varied milled fiber content were tested under flexural loads. A finite element-based numerical homogenization study was carried out on a micro-mechanical periodic unit-cell representing a non-homogeneous SFC to predict the mechanical properties of the microstructure. The dispersion state of fibers and fracture surface characteristics of SFC were analyzed via scanning electron microscopy. Further, the shear strength of the adhesive with and without reinforcement was experimentally evaluated using a lap shear test. Increasing the fiber content in the adhesive transforms it from a compliant state with poor strength into a much stiffer and stronger composite with reduced strain tolerance. The optimized SFC was selected for joining the two segments of the GFRP sewage pipe using a unidirectional composite as a tongue. Subsequently, the tongue-in-groove joints (TGJs) were tested under tension.
Experimental Study on Multi-Segmented Circular or Non-Circular Pipes to Determine the Pipe Stiffness Devanand Chelot, Priyank Upadhyaya Key Engineering Materials, 2022 A study was carried out to test unitary as well as multi-segmental circular and noncircular glass-reinforced plastic pipes under compression. Three pipe shapes were tested (box, semi-elliptical and round) under identical conditions using the ring stiffness method of testing. Hand layup technique was used for manufacturing the pipes. The pipes were designed with inner layers, central core and outer layers. The inner layer acts as the corrosion barrier layer, the core consists of blended sand impregnated with resin and the outer layer acts as the external layer which protects the pipe from impact. Based on the experimental results, it was concluded that multi-segmental pipes are stiffer and more flexible than unitary pipes because of the loading carrying capacity of the tongue and groove joint (TGJ).
A micromechanical viscoelastic cohesive layer model for predicting delamination in high temperature polymer matrix composites 28th Annual Technical Conference of the American Society for Composites 2013 ASC 2013, 2013
A multi-scale viscoelastic cohesive layer model for predicting delamination in high temperature polymer matrix composites Iccm International Conferences on Composite Materials, 2013
Predicting thermo-oxidative degradation in high temperature polymer matrix composites using multi-scale modeling 2nd Joint US Canada Conference on Composites American Society for Composites 26th Annual Technical Conference Canadian Association for Composite Structures and Materials, 2011
Predicting thermo-oxidative degradation in high temperature polymer matrix composites using multi-scale modeling 26th Annual Technical Conference of the American Society for Composites 2011 and the 2nd Joint US Canada Conference on Composites, 2011
Effect of chemical exposure on multi-piece GFRP sandwich pipes for sewage rehabilitation D Chelot, VL Mishra, V Panwar, A Tewari, P Upadhyaya Polymer Bulletin 83 (1), 1 , 2026 2026
Experimental Study on Chemical Resilience of Glass Reinforced Polymer Pipes for Sewage Applications P Upadhyaya, VL Mishra, D Chelot International Journal of Nanoelectronics and Materials (IJNeaM) 18 (3), 469-476 , 2025 2025
Analysis of Composite Sandwich Pipes Under Lateral Compression for Sewage Rehabilitation D Chelot, P Upadhyaya International Conference on Fibre-Reinforced Polymer (FRP) Composites in … , 2025 2025
Tailorable deformation and crushing behavior of 3D printed multilayered tetra-chiral lattices: Experiments and finite element modeling J Schneider, P Rawte, P Upadhyaya, S Kumar Materials Today Communications 43, 111463 , 2025 2025 Citations: 3
Enhanced strength and toughness of repurposed glass fiber reinforced adhesive joints for sewage applications D Chelot, A Tewari, K Shanmugam, P Upadhyaya The Journal of Adhesion 100 (7), 556-575 , 2024 2024 Citations: 7
A sustainable solution with improved chemical resilience using repurposed glass fibers for sewage rehabilitation pipes D Chelot, S Ravichandran, P Upadhyaya Recycling 9 (2), 28 , 2024 2024 Citations: 4
Preface: 2nd International Conference on Recent Advances in Fluid and Thermal Sciences (iCRAFT 2020) S Chowdhury, NK Shrivastava, P Upadhyaya PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN FLUID … , 2023 2023
Numerical simulations of acoustic metamaterial in grazing flow A Khan, P Upadhyaya, S Chowdhury PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN FLUID … , 2023 2023 Citations: 4
Design and optimization of acoustic sound absorbers for low frequency sounds D Khare, P Upadhyaya PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN FLUID … , 2023 2023 Citations: 1
Experimental Study on Multi-Segmented Circular or Non-Circular Pipes to Determine the Pipe Stiffness D Chelot, P Upadhyaya Key Engineering Materials 934, 171-178 , 2022 2022 Citations: 1
Numerical modelling of bilayer tetra periodic metamaterials to predict the elastic response PS Rawte, P Upadhyaya Materials Today: Proceedings 42, 2920-2926 , 2021 2021 Citations: 6
Multiscale modeling of strength and failure behavior of carbon nanostructure reinforced epoxy composite adhesives in bonded systems P Upadhyaya, S Kumar, JN Reddy, TE Lacy Jr European Journal of Mechanics-A/Solids 80, 103932 , 2020 2020 Citations: 16
Neural network for mechanical property estimation of multilayered laminate composite A Barbosa, P Upadhyaya, E Iype Materials Today: Proceedings 28, 982-985 , 2020 2020 Citations: 35
A micromechanical model to predict the viscoelastic response of syntactic foams G Hariharan, D Khare, P Upadhyaya Materials Today: Proceedings 28, 1200-1204 , 2020 2020 Citations: 7
Soft optical composites for tunable transmittance FL Jiménez, P Upadhyaya, J Liljenhjerte, PM Reis, S Kumar Extreme Mechanics Letters 9, 297-303 , 2016 2016 Citations: 11
Hyperelastic strain measurements and constitutive parameters identification of 3d printed soft polymers by image processing J Liljenhjerte, P Upadhyaya, S Kumar Additive Manufacturing 11, 40-48 , 2016 2016 Citations: 49
Micromechanics of stress transfer through the interphase in fiber-reinforced composites P Upadhyaya, S Kumar Mechanics of Materials 89, 190-201 , 2015 2015 Citations: 72
Pull-out capacity of adhesive anchors: An analytical solution P Upadhyaya, S Kumar International Journal of Adhesion and Adhesives 60, 54-62 , 2015 2015 Citations: 86
Soft color-composites for optical switching and dimming F Lopez Jimenez, P Upadhyaya, J Liljenhjerte, K Shanmugam, P Reis APS March Meeting Abstracts 2015, L36. 008 , 2015 2015
Modeling of stresses in an axisymmetric composite patch-repair system MA Khan, S Kumar, P Upadhyaya 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials … , 2015 2015 Citations: 6
MOST CITED SCHOLAR PUBLICATIONS
Pull-out capacity of adhesive anchors: An analytical solution P Upadhyaya, S Kumar International Journal of Adhesion and Adhesives 60, 54-62 , 2015 2015 Citations: 86
The changes in flexural properties and microstructures of carbon fiber bismaleimide composite after exposure to a high temperature MH Haque, P Upadhyaya, S Roy, T Ware, W Voit, H Lu Composite Structures 108, 57-64 , 2014 2014 Citations: 78
Micromechanics of stress transfer through the interphase in fiber-reinforced composites P Upadhyaya, S Kumar Mechanics of Materials 89, 190-201 , 2015 2015 Citations: 72
Hyperelastic strain measurements and constitutive parameters identification of 3d printed soft polymers by image processing J Liljenhjerte, P Upadhyaya, S Kumar Additive Manufacturing 11, 40-48 , 2016 2016 Citations: 49
A mechanism-based multi-scale model for predicting thermo-oxidative degradation in high temperature polymer matrix composites P Upadhyaya, S Singh, S Roy Composites Science and Technology 71 (10), 1309-1315 , 2011 2011 Citations: 42
A three-dimensional micromechanical model to predict the viscoelastic behavior of woven composites P Upadhyaya, CS Upadhyay Composite Structures 93 (11), 2733-2739 , 2011 2011 Citations: 38
Neural network for mechanical property estimation of multilayered laminate composite A Barbosa, P Upadhyaya, E Iype Materials Today: Proceedings 28, 982-985 , 2020 2020 Citations: 35
A novel numerical–experimental approach for predicting delamination in high temperature polymer matrix composites P Upadhyaya, S Roy, MH Haque, H Lu Composite Structures 104, 118-124 , 2013 2013 Citations: 24
Influence of nano-clay compounding on thermo-oxidative stability and mechanical properties of a thermoset polymer system P Upadhyaya, S Roy, MH Haque, H Lu Composites science and technology 84, 8-14 , 2013 2013 Citations: 22
Multiscale modeling of strength and failure behavior of carbon nanostructure reinforced epoxy composite adhesives in bonded systems P Upadhyaya, S Kumar, JN Reddy, TE Lacy Jr European Journal of Mechanics-A/Solids 80, 103932 , 2020 2020 Citations: 16
Soft optical composites for tunable transmittance FL Jiménez, P Upadhyaya, J Liljenhjerte, PM Reis, S Kumar Extreme Mechanics Letters 9, 297-303 , 2016 2016 Citations: 11
Enhanced strength and toughness of repurposed glass fiber reinforced adhesive joints for sewage applications D Chelot, A Tewari, K Shanmugam, P Upadhyaya The Journal of Adhesion 100 (7), 556-575 , 2024 2024 Citations: 7
A micromechanical model to predict the viscoelastic response of syntactic foams G Hariharan, D Khare, P Upadhyaya Materials Today: Proceedings 28, 1200-1204 , 2020 2020 Citations: 7
Numerical modelling of bilayer tetra periodic metamaterials to predict the elastic response PS Rawte, P Upadhyaya Materials Today: Proceedings 42, 2920-2926 , 2021 2021 Citations: 6
Modeling of stresses in an axisymmetric composite patch-repair system MA Khan, S Kumar, P Upadhyaya 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials … , 2015 2015 Citations: 6
A sustainable solution with improved chemical resilience using repurposed glass fibers for sewage rehabilitation pipes D Chelot, S Ravichandran, P Upadhyaya Recycling 9 (2), 28 , 2024 2024 Citations: 4
Numerical simulations of acoustic metamaterial in grazing flow A Khan, P Upadhyaya, S Chowdhury PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN FLUID … , 2023 2023 Citations: 4
Tailorable deformation and crushing behavior of 3D printed multilayered tetra-chiral lattices: Experiments and finite element modeling J Schneider, P Rawte, P Upadhyaya, S Kumar Materials Today Communications 43, 111463 , 2025 2025 Citations: 3
Multi-scale mechanism based life prediction of polymer matrix composites for high temperature airframe applications P Upadhyaya The University of Alabama , 2013 2013 Citations: 3
Design and optimization of acoustic sound absorbers for low frequency sounds D Khare, P Upadhyaya PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN FLUID … , 2023 2023 Citations: 1