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Study on Chemical Corrosion Resistance and Life Cycle Performance Improvement of PE Water Supply Pipes ——Drinking Water Transportation Applications Based on GB/T 13663 Standard
1. Research Background PE water pipes occupy 35% of global drinking water markets (2024 Global Market Insights), but face three challenges from ClO₂ disinfection: Service life <30 years under ClO₂ (vs. 50-year design) 0.1mm/h crack growth rate in PE80 25% strength decay with recycled materials 2. Core Issue: ClO₂-Induced Degradation 2.1 Oxidation Mechanism FTIR and GPC analysis (Figure 1) reveal three-stage degradation: Free radical initiation at tertiary carbons Molecular weight loss 15% per 0.1 carbonyl index increase Elongation at break drops from 600% to 120% after 1000h 2.2 Key Parameters Parameter GB Requirement Corrosion-Induced Decay Elongation at break (%) ≥350 8-12% annual loss SCG resistance (h) ≥100 (PE100) Reduced to 45h OIT... -
Steel-Plastic Interface Enhancement and High-Pressure Transportation Technology of Steel Wire Mesh Reinforced Composite Pipes ——Multi-Scenario Pressure Pipeline Applications Based on CJ/T 189 Standard
1. Research Background Steel wire mesh reinforced composite pipes occupy 28% of pressure pipeline markets (2024 CPPIA), offering SN16 ring stiffness and -40℃~80℃ temperature resistance, but face three challenges: Interfacial peel strength <40N/cm (CJ/T 189-2019 limit) Max pressure 3.5MPa with single-layer winding >3% deflection in large-diameter pipes 2. Core Issue: Interface Failure Mechanism 2.1 Bonding Mechanism XPS and pull-out tests (GB/T 2791-1995) reveal: Mechanical interlock failure (55%): Insufficient roughness (Ra <3.2μm) Chemical failure (30%): Polar mismatch between HDPE and steel Environmental failure (15%): Hydrolysis under water-oxygen exposure 2.2 Key Parameters Parameter GB Requirement Engineering Challenges Galvanized layer thickness (μm) ≥8 Coastal areas need >15μm Interfacial shear strength (MPa) ≥3.0 Traditional 2.2MPa... -
Prefabricated Structure Optimization and Intelligent Operation of Municipal Inspection Wells ——Buried Pipeline Engineering Applications Based on GB/T 23483 Standard
1. Research Background Inspection wells are critical nodes in urban underground pipelines, with 41% disease rate in 5 years for traditional brick wells: ＞30mm settlement (62% of failures) ＞2.5% leakage (GB/T 50268-2022 limit 1%) ＜35% manual inspection coverage 2. Core Issue: Failure Mechanisms 2.1 Structural Mechanics ABAQUS simulation (Figure 1) and field tests show: 0.85MPa shear stress under vehicle load (asphalt tensile strength 0.5MPa) 40% more displacement with <90% backfill compaction 1:3 stiffness ratio between brick and concrete 2.2 Construction Pain Points Process Traditional Issues Impact Excavation >50% over-excavation ★★★★☆ Joint treatment >15% grout leakage ★★★★☆ Backfill <92% compaction with small machines ★★★★☆ 3. Prefabricated...
