资料简介： Residual flexure capacity of corroded reinforced concrete beams
0 f" u6 D" h& W/ G0 N# A5 f) G0 Z Abstract，This work presents results from an experimental investigation which correlated flexure capacity loss with steel cross-section loss due to generalized corrosion of the embedded steel in a humid environment. Concrete beams (100 × 150 × 1500 mm) cast with chlorides were used in this investigation. Further acceleration of the corrosion process was achieved by applying a nominal 80 ?A/cm2 constant anodic current forapproximately 50-180 days. The specimens were subsequently tested in flexure under three-point loading. The average corrosion penetration, xAVER, the maximum concrete surface crack width, CWMAX, and the maximum rebar pit depth, PITMAX, were estimated for each corroded beam using gravimetric metal loss procedure. The results obtained showed: (1) the corrosion-induced concrete crack propagation was enhanced if dry rather than wet environment is used during the accelerated corrosion stage; (2) wet environment during corrosion acceleration enhanced pit formation at the rebar surface; (3) a decrease of as much as 60% in the flexure load capacity values was observed with only 10% of xAVER/r0,where r0 = rebar radius; and (4) PITMAX, not the xAVER/r0 ratio, was the most important parameter affecting flexural load capacity reduction in corroded beams.Keywords: Accelerated corrosion; Concrete durability; Cracking; Flexure load capacity; Propagation period; Reinforced concrete; Remaining life( I3 w1 x) w! T' X" |
锈蚀的钢筋混凝土梁柱的抗弯能力. f% p9 i2 w( i- u. ~
前言：这项工作提出了从实验的相关调查结果来反映弯钢截面在潮湿的环境中广义的预埋钢板腐蚀损失程度。在本次调查中混凝土梁（100×150×1500毫米），用氯化物来铸造的。为了腐蚀进程的进一步加速，运用了一个80μA/cm2名义恒定的阳极电流约50-180天。随后的标本进行弯曲测试下三点加载。平均腐蚀渗透，xAVER，最大混凝土表面裂缝宽度，CWMAX，最大螺纹钢坑深度，PITMAX，来估计每个锈蚀梁采用重量金属损耗的过程。得到的结果表明：（1）如果在干燥的情况下，腐蚀引起的混凝土裂缝扩展方向增强，而不是用于在潮湿环境加速腐蚀程度；（2）在潮湿的环境下加速腐蚀坑会在钢筋表面形成；（3）高达60％的抗弯负载能力，观察值的跌幅只有xAVER/r0的10％，其中r0=钢筋的半径；（4）PITMAX，而不是xAVER/r0比例，是影响混凝土梁锈蚀减少，抗弯承载能力最重要的参数。2 A/ X/ }0 h! [' d
关键词：加速腐蚀；混凝土耐久性开裂；弯曲负载能力；传播期；钢筋混凝土；剩余寿命
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