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摘要: 為改善塑管混凝土結構的界面密閉性能，研究了在塑管?混凝土界面粘貼一種雙面壓敏膠帶——Preprufe膠帶的作用。通過界面黏結強度、界面滲水高度和界面透氣性實驗，測得塑管混凝土結構的界面黏結強度、界面滲水高度、氣體壓力?時間衰減曲線，推導出界面滲透指數。試驗結果表明，界面黏結強度與粘貼膠帶的寬度的關系可初步認為符合冪函數分布，壓敏性粘合劑膠層與液態混凝土在硬化過程中形成的黏結強度遠大于普通黏性層與塑管間的黏結強度。粘貼Preprufe膠帶可顯著提高塑管?混凝土界面抗滲能力。界面滲透指數隨粘貼膠帶的寬度增大呈明顯的遞減趨勢，粘貼220 mm寬膠帶的塑管混凝土試件界面滲透指數僅為基準塑管混凝土試件的2.86%。Preprufe雙面壓敏膠帶在改善塑管?混凝土界面密閉性能上有良好的表現。在工程應用中可綜合考慮所需效果和價格成本來選取粘貼膠帶的寬度。Abstract: Concrete structures, such as bridge piers and pile foundations, in tidal/splash zones and soil–air transition zones in saline environments often suffer more severe structural corrosion and reinforcement corrosion than the structures completely in water, soil, or air. The application of plastic-pipe concrete can effectively solve this problem. Plastic-pipe concrete is formed by pouring concrete into a large-diameter plastic pipe with a certain structural size. Plastic pipes can protect the bridge piers and eliminate the water level change area and the soil–air junction area in structural design, to realize the integrated anti-corrosion protection of the bridge piers in the saline environment. The anti-corrosion protection effect of the plastic-pipe–concrete system depends on the impermeability of the plastic pipe–concrete interface. The difference in linear expansion coefficient between the plastic pipe and concrete and the shrinkage of the core concrete will damage the bonding layer between the plastic pipe and concrete, consequently affecting the interface impermeability. To improve the impermeability of the plastic pipe–concrete interface, the effect of a pressure-sensitive adhesive tape (Preprufe double-sided tape) attached to the plastic pipe–concrete interface was studied. Experiments were conducted to determine the interfacial bond strength, interfacial water penetration height, and interfacial air permeability, and the gas pressure–time decay curve was measured, and the interface permeability index was deduced. The experiment results show that the relationship between the interfacial bond strength and the adhesive tape width can be preliminarily considered as a power function distribution. The bond strength formed between the pressure-sensitive adhesive layer and the liquid concrete during the hardening process is much greater than that between the ordinary adhesive tape and the plastic pipe. Pasting the Preprufe tapes can significantly improve the impermeability of the plastic pipe–concrete interface. The interfacial permeability index decreases with the increase in the adhesive tape width, and the interfacial permeability index coefficient of plastic pipe–concrete specimens with 220 mm–wide tape is only 2.86% of that of the specimens without tape. The Preprufe double-sided pressure-sensitive tape has good performance in improving the impermeability of plastic pipe–concrete interfaces. In engineering applications, the adhesive tape width can be selected based on the required effect and cost.
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圖 2 Preprufe膠帶的宏觀與微觀構造圖。（a）宏觀構造圖；（b, c）微觀構造圖
Figure 2. Macrostructure and microstructure of the Preprufe tape: (a) macrostructure; (b, c) microstructure
圖 3 粘貼Preprufe雙面膠帶的塑管?混凝土試件
Figure 3. Plastic pipe–concrete specimens with the Preprufe double-sided tape
圖 6 界面透氣性測試系統。（a）示意圖；（b）實物圖
Figure 6. Interface airtightness test system: (a) diagram; (b) objects
圖 7 PRE-0壓力?時間衰減曲線及其擬合曲線
Figure 7. Pressure–time decay curve and its fitting curve of PRE-0
圖 8 Preprufe膠帶寬度與界面黏結強度的關系
Figure 8. Width of the Preprufe double-sided tape vs interface bonding strength
圖 9 核心混凝土滲水高度。（a）外表面；（b）內部
Figure 9. Seepage height of central concrete: (a) surface; (b) inner region
圖 11 Preprufe膠帶寬度與衰減時間Td的關系。（a）常規數值刻度；（b）對數刻度
Figure 11. Width of the Preprufe double-sided tape vs decay time Td: (a) conventional numerical scale; (b) logarithmic scale
圖 12 Preprufe膠帶寬度與界面滲透指數Ω的關系。（a）常規數值刻度；（b）對數刻度
Figure 12. Width of the Preprufe double-sided tape vs interface permeability index Ω: (a) conventional numerical scale; (b) logarithmic scale
表 1 C40混凝土配合比及基本性能
Table 1. C40 concrete mix ratio and basic performance
Water /(kg·m?3) Cement /(kg·m?3) Fine aggregate /(kg·m?3) Coarse aggregate /(kg·m?3) Slump /cm 28 d compressive strength /MPa 176 352 732 1140 18 52.0 
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表 2 粘貼不同寬度Preprufe雙面膠帶的塑管?混凝土界面密閉性能試驗結果
Table 2. Test results of impermeability of plastic pipe?concrete interface with Preprefe tape of different widths
Specimens Bond strength/
kPaInterfacial water penetration height Interfacial airtightness Water penetration height/cm Permeability coefficient/(10?7·cm·s?1) Decay time/s Permeability index, Ω/(10?3·s?1) PRE-0 44.6 13.85 2.38 199 9.43 PRE-55 263 0 — 383 4.41 PRE-110 512 0 — 1248 1.11 PRE-220 1070 0 — 3349 0.27 Note: The decay time refers to the time consumed when the pressure in the gasholder decays from 200 to 30 kPa
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