Browsing by Author "Maria Carvajal, Ana"
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- ItemDiagnosis and rehabilitation possibilities of real reinforced concrete structure(PONTIFICIA UNIV CATOLICA CHILE, ESCUELA CONSTRUCCION CIVIL, 2008) Maria Carvajal, Ana; Araya, Gerardo; Maturana, PabloA diagnosis and rehabilitation study of a reinforced concrete structure is presented in this paper. The Public building was corstructed in 1939, located in marine environment, distant less than I km of the coastal border, in a seismic zone, that for more than one decade has presented pathologies like: cracks, steel corrosion, loosening of concrete coverings and slab deformations. Quantitative analyses of profile chloride and sulphate ions to the concrete in different zones of the building, scanner of the reinforcements with Ferroscan, measurements of corrosion potential, compressive strength and capillary absorption were made. The quantity of chloride and sulphate ions in the concrete exceeded in 1.000% the amount acceptable by Chilean standards: 1,20 kg Cl- /m(3) concrete and 0,600 kg of SO42- /m(3) concrete.
- ItemIndustrial Byproduct-Based Concrete Subjected to Carbonation. Electrochemical Behavior of Steel Reinforcement(ESG, 2012) Aperador, Willian; Vera, Rosa; Maria Carvajal, AnaSamples of ASTM A-706 structural steel embedded in different concretes obtained from mixtures of alkali-activated steel slag and fly ash were exposed to accelerated carbonation under controlled conditions (4% CO2, 65% RH and 25 degrees C). Concretes prepared with Ordinary Portland Cement (OPC) (Type I) and Granulated Blast Furnace Slag Cement (GBFS) were used for comparison. Analysis of the electrochemical phenomenon taking place on the surface of the steel due to CO2 transport through the concrete matrix was performed by measurements of open circuit potential (OCP) and linear polarization resistance (LPR). The steel-concrete interface was characterized using Mossbauer spectroscopy at room temperature and X-ray diffraction (XRD). The electrochemical measurements suggest passivation of the steel in the concretes prepared using mixtures of steel slag and fly ash without cement.