DESEMPEÑO POR DURABILIDAD DE REVESTIMIENTOS DE HORMIGÓN ARMADO EN CONSTRUCCIONES EXPUESTAS A LA CONDICIÓN SUBTERRÁNEA DE EXPOSICIÓN EN CUBA.

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Bibliographic Details
Title:	DESEMPEÑO POR DURABILIDAD DE REVESTIMIENTOS DE HORMIGÓN ARMADO EN CONSTRUCCIONES EXPUESTAS A LA CONDICIÓN SUBTERRÁNEA DE EXPOSICIÓN EN CUBA.
Alternate Title:	DURABILITY PERFOMANCE OF REINFORCED CONCRETE COVERINGS IN BUILDINGS EXPOSED TO THE UNDERGROUND EXPOSURE CONDITION IN CUBA.
Authors:	Martínez Domínguez, Reneilder¹, Castañeda Valdés, Abel² abel.castaneda@cnic.cu
Source:	Revista CENIC Ciencias Quimicas. 2025, Vol. 56, p147-166. 20p.
Subjects:	REINFORCED concrete, CORROSION & anti-corrosives, SERVICE life, DURABILITY, CARBONATION (Chemistry), QUALITY control of concrete
Geographic Terms:	CUBA
Abstract (English):	The durability performance of reinforced concrete has been extensively studied under outdoor exposure condition to the atmosphere in Cuba. This is not the case in reinforced concrete coatings in buildings exposed to underground exposure conditions. To characterize the durability performance in nine buildings exposed in three outdoor environments, is the main objective of this study. To evaluate the concrete quality. To estimate the corrosivity categories of the atmosphere as a type of indoor exposure condition. To demonstrate the factors influencing in the corrosion current intensity in reinforcement steel and to estimate the service life of the buildings are the specific objects Three buildings in coastal, rural, and urban outdoor environments were selected. Four destructive and non-destructive tests were used, based on the 30 values determination. The concrete showed inadequate quality in the three outdoor environments exposed to medium and high corrosivity categories of the atmosphere in the underground exposure condition. Long service life project higher than 80 years, were not obtained for the buildings. Factors influencing in the corrosion current intensity were very consistent, with the reinforced concrete exposed to outdoor exposure condition to very high corrosivity categories of the atmosphere. The durability requirements obtained for this condition, where the concrete guaranteed a long service life project higher than 80 years and high resistance to carbonation could be used in reinforced concrete coating. The ultrasonic pulse speed may be necessary but not sufficient, being the effective percentage capillary porosity a very influential factor. For high values of this parameter, indicative of poor quality concrete, an increase in the carbonation phenomenon took place in the concrete, considerably accelerating atmospheric corrosion in the reinforcement steel, mainly in buildings in the external rural environment, where for the underground exposure condition, higher values of relative humidity and shorter service life projects were demonstrated. [ABSTRACT FROM AUTHOR]
Abstract (Spanish):	El desempeño por durabilidad del hormigón armado ha sido muy estudiado para la condición de exposición al exterior a la atmós fera en Cuba. No siendo así en revestimientos de hormigón armado en construcciones expuestas a la condición subterránea de exposición. Caracterizar el desempeño por durabilidad en nueve construcciones expuestas a dicha condición en tres ambientes exteriores, es el objetivo general del estudio. Evaluar la calidad del hormigón. Estimar las categorías de agresividad corrosiva de la atmósfera como un tipo de condición de exposición al inte rior. Demostrar los factores influyentes en la intensidad de corriente de corrosión en el acero de refuerzo y estimar la vida útil de proyecto de las construcciones, son los específicos. Tres construcciones en ambientes exteriores costero, rural y urbano, fueron seleccionadas. Cuatro ensayos de structivos y no destructivos a partir de la determinación de 30 valores fueron empleados. El hormigón presentó una calidad inadecuada en los tres ambientes exteriores expuesto a categorías de agresividad corrosiva de la atmósfera de media y elevada en la condición soterrada de exp osición. Plazos elevados de vida útil de proyecto, superiores a 80 años, no fueron obtenidos para las construcciones. Factores influyentes en la intensidad de corriente de corrosión resultaron muy coincidentes, con el hormigón armado expuesto a la condición de exposición al exterior frente a cate gorías muy elevadas de agresividad corrosiva de la atmósfera. Los requerimientos por durabilidad obtenidos para esta condición, donde el hormigón gara ntizó plazos elevados de vida útil de proyecto mayor que 80 años y una resistencia elevada a la carbonatación, pudieran ser usados en los revestimientos de hormigón armado. La velocidad de pulso ultrasónico pudiera resultar necesario, pero no suficiente, siendo el porcentaje de po rosidad capilar efectivo un factor muy influyente. Para valores elevados de este parámetro, indicativo de un hormigón de mala calidad, un incremento en el fenómeno de la carbonatación tuvo lugar en el hormigón, acelerando de manera considerable la corrosión atmosférica en el acero de refuerzo, principalmente en las construcciones en el ambiente rural externo, donde para la condición subterránea de exposición, valores mayores de humedad relativa y plazos menores de vida útil fueron demostrados. [ABSTRACT FROM AUTHOR]
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Database:	MedicLatina

Description
Abstract:	The durability performance of reinforced concrete has been extensively studied under outdoor exposure condition to the atmosphere in Cuba. This is not the case in reinforced concrete coatings in buildings exposed to underground exposure conditions. To characterize the durability performance in nine buildings exposed in three outdoor environments, is the main objective of this study. To evaluate the concrete quality. To estimate the corrosivity categories of the atmosphere as a type of indoor exposure condition. To demonstrate the factors influencing in the corrosion current intensity in reinforcement steel and to estimate the service life of the buildings are the specific objects Three buildings in coastal, rural, and urban outdoor environments were selected. Four destructive and non-destructive tests were used, based on the 30 values determination. The concrete showed inadequate quality in the three outdoor environments exposed to medium and high corrosivity categories of the atmosphere in the underground exposure condition. Long service life project higher than 80 years, were not obtained for the buildings. Factors influencing in the corrosion current intensity were very consistent, with the reinforced concrete exposed to outdoor exposure condition to very high corrosivity categories of the atmosphere. The durability requirements obtained for this condition, where the concrete guaranteed a long service life project higher than 80 years and high resistance to carbonation could be used in reinforced concrete coating. The ultrasonic pulse speed may be necessary but not sufficient, being the effective percentage capillary porosity a very influential factor. For high values of this parameter, indicative of poor quality concrete, an increase in the carbonation phenomenon took place in the concrete, considerably accelerating atmospheric corrosion in the reinforcement steel, mainly in buildings in the external rural environment, where for the underground exposure condition, higher values of relative humidity and shorter service life projects were demonstrated. [ABSTRACT FROM AUTHOR]
ISSN:	10158553