Effect of ground granulated balast furnace slag on the durability of concrete and reinforced concrete

This work aims to estimate the corrosion activity by determining the current and totalcorrosion with measurements and experiments carried out on reinforced concrete specimenswhich are produced with different mix design and exposed to different environmentalconditions. In the experimental part of the study, fluid consistency concrete is produced withlimestone based crushed stone, silica based sand and ground granulated blast furnace slag; 0%o additive), 30% and 60%, having water/binder ratio of 0.49 and 0.5% additive. 192cylindrical concrete samples having dimensions of 100/200 mm, 150 cubic concrete sampleshaving dimensions of 150 mm, and 18 prismatic reinforced concrete samples havingdimensions of 279.4x152.4x114.4 mm are produced by using the concrete which freshconcrete properties are determined. After remolding the concrete samples, they are stored for8 days in standard conditions, and at the end of 28 days, the samples are exposed tomagnesium chloride solution with chloride concentrations of 0 (water), 10000 and 40000/l for 14 days, and then in the laboratory conditions for another 14 days, and each series isexposed to 0 (control), 1, 3, 6, 9, and 12 cycles. Reinforced concrete samples are kept in wetburlap for 28 days and then polystyrene ponds are installed on each samples, water andsolutions containing chlorides are filled and emptied for 14 days period, and wetting-dryingcycles are applied during 1, 3, 6, 9, 12, and 15 cycles. The cylindrical samples were subjectedto compressive and tensile splitting tests, cubic samples were subjected to water permeabilitysts while half-cell potential and macro-cell potential on prismatic samples are measured.o density, ultrasonic pulse velocity, water absorbtion ratios, carbonation depth and freechloride concentrations at different depths are determined.ording to the test results, the compressive and flexural strength of concretes with andwithout ground granulated blast furnace slag increase by time although they are exposed towetting-drying cycle. Utilization and increasing the amount of ground granulated blastfurnace slag in concrete production make affirmative effect on concrete performance.Reinforced corrosion decreases by decreasing the permeability of concrete, transfer ofcloride ions into concrete; diffusivity of chloride ions, current flowing (µA) between anode-cothode, and total corrosion (coulomb). Although carbonation depth increases and alkalinitydreases due to the pozzolanic property of ground granulated blast furnace slag, corrosion ofdamaged reinforced concrete specimens decreases. It is convicted that the estimation ofcurrent flowing on 100 Ω resistance and comparing with critical current value is possible withmeasurements and experiments that are carried out on reinforced concrete specimens andequations developed by using the experimental results.