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Advances in Modeling Concrete Service Life: Proceedings of by Carmen Andrade (auth.), Carmen Andrade, Joost Gulikers

By Carmen Andrade (auth.), Carmen Andrade, Joost Gulikers (eds.)

In this booklet, a serious research is made on provider existence versions on the topic of reinforcement corrosion. The participants are at the frontier of data within the box of sturdiness of bolstered concrete. subject matters lined within the e-book comprise: factors and mechanisms of degradation, delivery mechanisms in concrete, numerical modeling of concrete habit, toughness modeling and prediction, reliability method of structural layout for sturdiness, structural habit following degradation of concrete constructions, deterioration and service of concrete constructions, and corrosion dimension techniques.

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Extra resources for Advances in Modeling Concrete Service Life: Proceedings of 4th International RILEM PhD Workshop held in Madrid, Spain, November19, 2010

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In the present paper results are given for concrete elements exposed in outdoor and indoor conditions and the analysis is made in order to relate the corrosion rates measured to the RH or to temperature. Acceptable degree O ,T ,r h O2 CO2,C1 TIME PROPAGATION INITIATION LIFETIME OR TIME BEFORE REPAIR Fig. 1 35 Experimental Specimens The samples used were: a reinforced concrete T-beam [4] and a square section pile, as illustrated in Figure 2. Both specimens have been contaminated with 3% chloride by weight of cement added to the mix in the form of CaCl2 to promote corrosion and were exposed to Madrid climate.

5M NaCl solution. The evolution of the corrosion rate is shown in Figure 6. 5M NaCl curves are an average of six and three steels, respectively. The same Steel Corrosion In Deaerated Solutions 59 Fig. 5M NaCl solutions Fig. 5M NaCl solutions trend for the Ecorr was found in both chloride concentrations. 5M NaCl solution, respectively. 5M NaCl solution, respectively. Applying Faraday’s law it is possible to calculate the electrochemical weight loss [6]. The comparison of this electrochemical weight loss and the real gravimetric losses is shown in Figure 7.

Ag/AgCl Ecorr (mV) vs. Ag/AgCl 200 4 cm 7,5 cm 0,5 cm 1,5 cm 2,5 cm Carbon Steel Binder Cement 400 kg/m3 -w/c 0,6 200 Ecorr (mV) vs. Ag/AgCl Ecorr (mV) vs. Ag/AgCl 400 200 0 -200 -400 -600 -800 -1000 -1200 c b Carbon Steel Binder Cement 300 kg/m3 -w/c 0,6 0 2 4 6 8 4 cm 7,5 cm 10 12 Time (Years) Fig. 2 Influence of concrete cover in potential corrosion (vs. 2µA/cm2. Thus, from a practical point of view, depassivation is not an instant or short period phenomenon and requires a period of months or even years.

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