Print Email Facebook Twitter Properties of the steel-mortar interface derived by impedance spectroscopy in different environment and curing conditions Title Properties of the steel-mortar interface derived by impedance spectroscopy in different environment and curing conditions Author Chen, Zhipei (TU Delft Materials and Environment) Koleva, D.A. (TU Delft Materials and Environment) van Breugel, K. (TU Delft Materials and Environment) Date 2015-08-16 Abstract In practice, reinforced concrete structures may encounter different kinds of curing conditionsdue to the weather (sun radiation, air moisture and wind), nearby external environment(seawater, attack of stray current arising from nearby railways), or human factors (insufficientcuring period). In some extreme conditions, the corrosion of embedded steel will occur at earlyage, and the pore structure of cementitious material matrix can also be influenced. One of thesignificant consequences is the premature failure of steel- matrix interface, which playsimportant role for the integrity of a structure during the subsequent service life. Thisphenomenon leads frequently to early deterioration and eventually to risky situations for thestability of structures. In any case, the economic costs inherent to reparation works areconsiderable.Therefore, the state and properties of the steel/cement-based material interface is tobe monitored from early ages, especially under extreme operating conditions. As one of thenondestructive testing methods, electrochemical impedance spectroscopy (EIS) can beemployed to account for properties at the steel/cement paste interface. EIS measurements arevery useful since they provide the possibility of correlating the dielectric properties and themicrostructure of a cementitious material (derived from the high frequency region), with thecorrosion behavior of the embedded steel (derived from the low frequency region).In this work, to simulate different curing conditions, standard curing for 28d and “on-air” curingafter 24h were employed. Different groups of reinforced mortar specimens of the same mixturewere designed according to the existence or coexistence of chloride, stray current, and anodicpolarization. The steel-mortar interface properties with age and under different curing conditionswas monitored by EIS measurement. The paper presents the evolution of the fitting parameters,corresponding to the cementitious material matrix, embedded steel and interaction betweenthem are explained and compared in terms of different curing conditions. This research isexpected to clarify that the, curing conditions in unusual work environment (as for example straycurrent conditions) must be taken into account regarding the behavior of steel-matrix interface atearly age, and some curing methods must be put into practice in order to obtain satisfactoryperformance of the reinforced structure before the structure is used at full operational capacity. Subject steel-mortar interfacecuring conditionsimpedance spectroscopy To reference this document use: http://resolver.tudelft.nl/uuid:aa6dfd00-3e8d-4bc4-9e1d-fbb25cbe7f09 Page numbers 1 Event XXIV International Material Research Congress (IMRC) 2015, 16-20 August 2015, Cancun, Mexico, 2015-08-16 → 2015-08-20, Cancun, Cancun, Mexico Part of collection Institutional Repository Document type abstract Rights © 2015 Zhipei Chen, D.A. Koleva, K. van Breugel Files PDF XXIV_International_Materi ... i_Chen.pdf 173.14 KB Close viewer /islandora/object/uuid:aa6dfd00-3e8d-4bc4-9e1d-fbb25cbe7f09/datastream/OBJ/view