氯裂纹钢中氯化物诱发的腐蚀与裂纹PPC混凝土：实验研究
摘要
裂缝普通硅酸盐水泥（OPC）和波特兰火山灰水泥（PPC）中钢筋的腐蚀行为预裂纹宽度研究。研究中使用了一种简单的U形样品，在弯曲载荷下具有预制裂纹;试样有一个变形的钢筋直径12毫米，底部装有20毫米透明盖。测量包括氯离子渗透性，吸着性，半电池电位，电阻率，通过的总电荷和重量减轻。发现PPC的氯离子渗透性接近三倍低于OPC。 PPC钢筋重量损失的重量减少量约为1.5在预裂混凝土的情况下为2.0。 OPCs的直径减小（即由点蚀引起）较高。研究表明，PPC是即使在破裂条件下，在腐蚀抑制方面也显着优于相应的未裂化的OPCs。 DOI：10.1061 /（ASCE）MT.1943-5533.0000260。 copy;2011美国土木工会。CE数据库主题标题：混凝土;氯化物;腐蚀;钢;开裂。
关键词：混凝土;氯化物;腐蚀;钢;开裂。
Chloride-Induced Corrosion of Steel in Cracked OPC and
PPC Concretes: Experimental Study
Abstract
The corrosion behavior of steel in cracked ordinary portland cement (OPC) and portland pozzolana cement (PPC) concretes whenexposed to a chloride-rich environment is presented here. Three water-to-cement (w=c) ratios, and precrack widths of 0.2 and 0.4 mm werestudied. A simple U-shaped specimen with precracks under flexural load was used in the study; the specimen has a deformed steel bar of12 mm diameter placed at the bottom with 20 mm clear cover. Measurements made include chloride ion penetrability, sorptivity, half-cellpotential, resistivity, total charge passed and gravimetric weight loss. The chloride ion penetrability of PPC was found to be nearly three timeslower than that of OPC. The reduction in the gravimetric weight loss of rebars in PPC with respect to those in OPC is in the range of about 1.5to 2.0 in the case of precracked concretes. The reduction in diameter (i.e., caused by pitting) is higher for OPCs. Studies showed that PPC issignificantly superior to the corresponding uncracked OPCs in terms of corrosion inhibition even under cracked conditions. DOI: 10.1061/(ASCE)MT.1943-5533.0000260. copy; 2011 American Society of Civil Engineers.CE Database subject headings: Concrete; Chloride; Corrosion; Steel; Cracking.
Keywords: Concrete; Chlorides; Corrosion; Steel; Cracking.
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