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<p>An in-depth understanding of the corrosion behavior of composite pipes is crucial due to their exposure to diverse chemical environments. This study focuses on Glass Reinforced Plastic (GRP) composites specifically for the rehabilitation of aging sewage pipelines. The GRP pipe under investigation features a multi-layer sandwich structure, composed of polyester and Dicyclopentadiene (DCPD) resins, with a blended sand core added in the middle. Each layer of the sandwich structure, as well as the composite specimens, were exposed to harsh chemical environments that closely replicate both the installation process and in-service conditions. The chemicals used for immersion testing included sulfuric acid (H<sub>2</sub>SO<sub>4</sub>), sodium hypochlorite (NaClO), methyl ethyl ketone peroxide (MEKP), distilled water, sodium chloride (NaCl), acetone (C<sub>3</sub>H<sub>6</sub>O), cobalt octoate, and dimethylacetamide (DMA). The individual layers and composite were immersed for 6 months and samples were tested periodically. Chemical effects on surface morphology and composition were evaluated through mass loss, Field Emission Scanning Electron Microscopy (FE-SEM), and X-ray Fluorescence (XRF) analysis. For multi-piece pipes, tongue-in-groove joints (TGJs) are used to assemble the complete pipe from segmented pieces. TGJ samples were tested under tensile loads before and after chemical exposure. It was found that acetone had the most detrimental effect on peak stress (71% reduction), followed by DMA (47%) and MEKP (43%). Samples exposed to MEKP also exhibited significantly reduced failure strain (26%), leading to increasingly brittle behavior. The study highlights the importance of removing solvents and curing agents from pipe surfaces near joints, as they can impact mechanical properties due to chemical exposure.</p>

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Effect of chemical exposure on multi-piece GFRP sandwich pipes for sewage rehabilitation

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Devanand Chelot,
  • Vijay Lakshmi Mishra,
  • Vishal Panwar,
  • Abhishek Tewari,
  • Priyank Upadhyaya

摘要

An in-depth understanding of the corrosion behavior of composite pipes is crucial due to their exposure to diverse chemical environments. This study focuses on Glass Reinforced Plastic (GRP) composites specifically for the rehabilitation of aging sewage pipelines. The GRP pipe under investigation features a multi-layer sandwich structure, composed of polyester and Dicyclopentadiene (DCPD) resins, with a blended sand core added in the middle. Each layer of the sandwich structure, as well as the composite specimens, were exposed to harsh chemical environments that closely replicate both the installation process and in-service conditions. The chemicals used for immersion testing included sulfuric acid (H2SO4), sodium hypochlorite (NaClO), methyl ethyl ketone peroxide (MEKP), distilled water, sodium chloride (NaCl), acetone (C3H6O), cobalt octoate, and dimethylacetamide (DMA). The individual layers and composite were immersed for 6 months and samples were tested periodically. Chemical effects on surface morphology and composition were evaluated through mass loss, Field Emission Scanning Electron Microscopy (FE-SEM), and X-ray Fluorescence (XRF) analysis. For multi-piece pipes, tongue-in-groove joints (TGJs) are used to assemble the complete pipe from segmented pieces. TGJ samples were tested under tensile loads before and after chemical exposure. It was found that acetone had the most detrimental effect on peak stress (71% reduction), followed by DMA (47%) and MEKP (43%). Samples exposed to MEKP also exhibited significantly reduced failure strain (26%), leading to increasingly brittle behavior. The study highlights the importance of removing solvents and curing agents from pipe surfaces near joints, as they can impact mechanical properties due to chemical exposure.