Reinforced Concrete Durability Control by Electrochemical methods用电化学方法筋混凝土耐久性控制.docVIP

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Reinforced Concrete Durability Control by Electrochemical methods用电化学方法筋混凝土耐久性控制.doc

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Reinforced Concrete Durability Control by Electrochemical methods用电化学方法筋混凝土耐久性控制

Reinforced Concrete Durability Control by Electrochemical Methods A. Routoulas, Professor, P. Pantazopoulou, A. Marousaki Physics, Chemistry Materials Technology Department Technological Educational Institute of Piraeus P. Ralli and Thivon 250, 122 44, Egaleo, Athens – Greece Tel.: +33 210 5381169, E-mails: arout@teipir.gr, parpant@central.ntua.gr The incorporation of industrial by-products such as fly ash and blast furnace slag as additives in concrete is known to improve effectively the resistance of concrete to various chemical attacks and thus its long-term durability. Blast-Furnace Slag (BFS) is a waste product in the manufacture of cast iron, whereas Cement Kiln Dust (CKD) is a by-product of low-alkali cement manufacturing process. The aim of this study is the investigation of the performance of CKD when used together with BFS and corrosion inhibitors and the determination of their optimum proportions. A reference Portland Cement (PC) and composite cements containing BFS and CKD at various percentages as cement replacement were used to prepare prismatic and cylindrical test specimens with embedded steel bars that were exposed to partial immersion in 3.5% wt. NaCl solution. Determination of the rebars corrosion protection by the strain gauges technique and measurements of the corrosion current density as well as long-term measurements of half-cell potentials were correlated to the results form the gravimetric determination of metal loss of rebars. The strain gauge (SG) technique, used for fast monitoring of corrosion caused under impressed anodic potential, is based on the appearance of swelling strain near the steel rebars in the concrete. The test results indicated that the use of CKD alone provided the lowest corrosion rate. The use of BFS alone, as well as the combined use of BFS and CKD in the percentage of 15%, resulted in higher corrosion rates, whereas the combined use of BFS and CKD in the percentages of 5% and 10% resulted in a protection level al