Electrochemical reactions for steel beams strengthened with CFRP sheets
Electrochemical reactions for steel beams strengthened with CFRP sheets
复制标题
DOI：
10.1016/j.engstruct.2016.07.029
复制
发表时间：
2016-10
影响因子：
5.5
通讯作者：
Y. J. Kim;Ibrahim Bumadian
中科院分区：
文献类型：
--
作者：
Y. J. Kim;Ibrahim Bumadian
研究了电化学反应对碳纤维布加固钢梁的物理和化学响应的影响。采用加速腐蚀方案对加固梁进行劣化处理。重点研究了梁的电势、质量损失、腐蚀电流密度、腐蚀速率、弯曲能力、界面应变发展、破坏模式和红外光谱。随着电化学反应时间的延长，腐蚀损伤逐渐扩散，但没有观察到CFRP过早剥离的现象。表面铁锈的存在往往会阻碍电流的流动，减少铁离子的扩散，从而降低腐蚀速度。腐蚀损伤的后果导致加固梁的承载能力沿起始-扩展和稳态两个阶段下降。电化学效应改变了CFRP的脱粘模式，从离散-不连续发展到平稳发展。红外光谱分析表明，从化学角度来看，随着腐蚀程度的增加，CFRP体系的官能团发生了变化。提出了设计建议，以促进碳纤维布加固在腐蚀环境下的钢构件的使用。
This paper presents the effect of electrochemical reactions on the physical and chemical responses of steel beams strengthened with carbon fiber reinforced polymer (CFRP) sheets. An accelerated corrosion protocol is used to deteriorate the strengthened beams. An emphasis is placed on the electric potential, mass loss, corrosion current density, corrosion rate, flexural capacity, interfacial strain development, failure mode, and infrared spectroscopy of the beams. Corrosion damage is dispersed with increasing electrochemical reaction time; however, premature CFRP-debonding is not observed. The presence of surface rust tends to impede the flow of electric current and the diffusion of iron ions is reduced, thereby decreasing the rate of corrosion. The consequence of corrosion damage results in a decrease in load-carrying capacity of the strengthened beams along with two phases, such as initiation-propagation and steady-state. The electrochemical effect alters the pattern of CFRP-debonding from discrete-discontinuous to smooth progression. Infrared spectroscopy illustrates that the functional group of the CFRP system changes from a chemistry standpoint as the degree of corrosion augments. Design recommendations are proposed to facilitate the use of CFRP-strengthening for steel members subjected to corrosive service environments.