对国内采用玻璃钢包覆桩基础浪溅区及水位变动区作为耐海水腐蚀措施的海洋工程进行了现场调研;采用质量变化率试验,研究了海水向玻璃钢内部的扩散行为;并采用Fick第二扩散定律对玻璃钢包覆层的耐海水渗透寿命进行预测,建立了玻璃钢包覆层厚度与耐海水渗透寿命之间的关系.结果表明:海水向玻璃钢内部的扩散行为符合Fick第二扩散定律,2mm厚的189不饱和聚酯玻璃钢的耐海水渗透寿命约为36 a,2 mm厚的MFE-2环氧乙烯基酯玻璃钢的耐海水渗透寿命可达60 a,玻璃钢包覆层表现出了优异的耐海水腐蚀性能.
Field research was conducted to evaluate the national piles foundation engineering that adopted glass fiber reinforced plastic (GFRP) composite layer as anti-corrosion measures in splash and tide zones.Mass variation rate method was used to study the diffusion behavior of seawater to GFRP composites.The second Ficks law of diffusion was used to predict the service life of GFRP composite layer,and the relationship between service life and thickness of GFRP composite layer was built.Results showed that the diffusion behavior of seawater to GFRP composites conformed to the second Ficks law of diffusion.With the thickness of 2 mrn,the life resistant to seawater penetration of 189 GFRP composites was about 36 years;while the MFE-2 epoxy vinyl ester based GFRP composites was about 60 years.The GFRP composites showed excellent anti-corrosion property to seawater.
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