Degradation Process and Life Span Estimation of Marine Concrete Structures

海洋混凝土结构的退化过程和寿命估算

• 批准号: 09305032
• 负责人: MIYAGAWA Toyoaki
• 金额: $ 16.13万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09305032/
• 关键词: Marine Concrete Structure; Degradation Process; Life Span Estimation; Chrolide Corrosion; High Performance Concrete; Fiber Sheet; Confined Concrete; Construction Joint; 海洋コンクリート; 繊維補強コンクリート

In this study, in making width volume ratio of confinement, existence of the CFRP sheet reinforcement, placing joint of the concrete including the salinity on the assumption of the macrocell corrosion, use of high workable concrete to be a factor, reinforcement corrosion of the RC flexural member in the salt water sprinkling accelarating environment was monitored. Results got are as follows.(a) The axial crack of width over 0.2mm and over several length has been all generated in specimens under salt water sprinkling at present. Though the difference of the crack by rho_s was not clear, in the CFRP sheet specimen, the crack width tended to be small. Both crack width and length of the high workable concrete specimen tended to be larger than the plain concrete(b) From corrosion loss rate of the bending span of the degraded specimen by AC corrosion monitor, more corrosion loss rate was observed in those specimens with confinement. Corrosion loss rate of the CFRP sheet reinforcement specimen comparatively small, It is due to the shielding of the salinity by the restraint of the crack in addition to the surface coating of the CFRP sheet.(c) Judging from aging of corrosion rate by the rectangular wave corrosion monitor, corrosion rate once increases on the dispersion from the axial cracking (around 97/7) and it tends to decrease afterwards. The increase is due to the crack propergation and the decrease is due to plugging of corrosion product.

在这项研究中，在使限制的宽度体积比之比时，CFRP板增强的存在，将混凝土的关节放置在包括含麦克罗腐蚀的假设上的盐度，使用高可工程混凝土作为因素，是一种因素，是一种因素，将RC弯曲成员的增强腐蚀在盐水洒水加速环境中受到监测。结果得到如下。（a）宽度超过0.2mm的轴向裂纹，并且目前在盐水下都在标本中产生了几个长度。尽管在CFRP纸样品中，Rho_s的裂纹差异尚不清楚，但裂纹宽度往往很小。高可加工混凝土试样的裂纹宽度和长度往往大于AC腐蚀监测器降解样品的弯曲跨度的普通混凝土（b），在那些被限制的那些标本中观察到了更多的腐蚀损失率。 CFRP表钢筋钢筋的腐蚀损失率相对较小，这是由于除了CFRP纸的表面涂层外，盐度掩盖了盐度。（c）从腐蚀速率通过腐蚀速度的老化来判断，腐蚀率一度从轴向腐蚀量增加到轴向裂纹（左右）（均为97/7/7/7/7/7/7/7/7/7/7/7/hource crackiate of the the Prosersion tefers prossion the Prossion frovers int the Prosersion。增加是由于裂缝的适当处理而造成的，并且减少是由于插入腐蚀产物所致。