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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >DURABILITY OF CONCRETE-FILLED FRP TUBES SUBJECTED TO SALT SOLUTION
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DURABILITY OF CONCRETE-FILLED FRP TUBES SUBJECTED TO SALT SOLUTION

机译：受盐溶液影响的FRP钢管的耐久性

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摘要

This paper presents mechanical, microstructural and physical characterization of concrete-filled FRP tubes (CFFTs) used as structural elements such as pier columns and marine piles. GFRP tubes filled with normal concrete were exposed to salt solution at 23, 40, and 50℃ to accelerate the effect of the environment and of the salt solution. The measured apparent hoop tensile strength of the tube before and after exposure were considered as a measure of the durability performance of the specimens and were used for long-term properties prediction based on the Arrhenius theory. In addition, Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) were used to characterize the aging effect on the CFFT. The main objective of this study is to evaluate the durability and to predict the long-term behaviour of the GFRP tubes used in the CFFT system. The test results showed that the GFRP tubes investigated in this study present a very good stability in the environment simulating the field service conditions. The maximum observed reduction in hoop tensile strength under the rather aggressive environment was 20%.
机译：本文介绍了混凝土FRP管（CFFT）的力学，微观结构和物理特性，这些结构用作墩柱和海事桩等结构元件。将填充有普通混凝土的GFRP管在23、40和50℃下暴露于盐溶液中，以加快环境和盐溶液的作用。试管在暴露前后所测得的表观环向拉伸强度被认为是试样耐久性能的量度，并用于基于阿伦尼乌斯理论的长期性能预测。另外，使用傅里叶变换红外光谱（FTIR），差示扫描量热法（DSC）和扫描电子显微镜（SEM）来表征老化对CFFT的影响。这项研究的主要目的是评估CFFT系统中使用的GFRP管的耐久性并预测其长期性能。测试结果表明，本研究中研究的GFRP管在模拟现场服务条件的环境中具有很好的稳定性。在相当恶劣的环境下，所观察到的最大环向拉伸强度降低为20％。

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