In-field performance of North Sea offshore platforms with regard to chloride resistance

Helland, Steinar; Aarstein, R.; Maage, M

doi:10.1680/stco.2010.11.1.015

Cited by 27 publications

(24 citation statements)

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“…Depending on a number of factors during concrete construction, the achieved quality of the finally placed concrete normally shows an even higher scatter and variability. Even for the offshore concrete platforms in the North Sea, where a very high quality of both concrete production and concrete construction was applied, most of the durability problems which have been experienced later on can be ascribed due to lack of proper quality control and special problems during concrete construction [1,52].…”

Section: Generalmentioning

confidence: 99%

Durability of Concrete Structures

Gjørv

2011

Arab J Sci Eng

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Extensive experience demonstrates that the durability of concrete structures is related not only to design and material but also to construction issues. Upon completion of new concrete structures, the achieved construction quality always shows a high scatter and variability, and in severe environments, any weaknesses in the concrete structures will soon be revealed whatever specifications and constituent materials have been applied. In order to better take all this variability into account, a probability-based durability design should be applied. Since many durability problems also can be related to poor quality control as well as special problems during concrete construction, the issue of construction quality and variability must also be firmly grasped before any rational approach to a more controlled durability can be achieved. Therefore, a performance-based concrete quality control during concrete construction with documentation of achieved construction quality and compliance with the specified durability should also be carried out. When the concrete structure is completed, the owner should further be provided with a proper service manual for the future operation of the structure. Only such a service manual for condition assessment and preventive maintenance can provide the ultimate basis for achieving a more controlled durability and service life of concrete structures in severe environments. In the present paper, current experience with probability-based durability design and performance-based concrete quality control is briefly outlined and discussed.

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Section: Generalmentioning

confidence: 99%

Durability of Concrete Structures

Gjørv

2011

Arab J Sci Eng

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“…The use of silica fume is one of the promising areas for highquality cement composite technology [12]. In particular, in the production of lightweight concrete Heidun Oil platform in its structure silica fume added in an amount of 20 kg/m 3 [7]. Silica fume reduces the volume changes in concrete, thereby reducing the number of micro-cracks [13].…”

Section: The Scientific Journal Of Cihan University -Sulaimanyiamentioning

confidence: 99%

“…In particular, light concrete class LC-60 constructed "Heidun" floating oil platform. The platform operates in the Norwegian sector of the North Sea [7]. Concrete with porous aggregates have shown excellent durability in the harsh operating conditions in waters with sulfates and chlorides.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2017

SJCUS

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Abstract. Concrete ships (floating docks, hotels, houses, marinas, oil platforms) are being built in many countries around the world. For such ships previously used mainly heavy concrete. Recently, for concrete floating structures often use lightweight aggregate concrete. Using expanded clay lightweight concretes reduces the weight of the construction. At reducing the weight load lifting of the floating structure is increased. The use of lightweight concrete improves people's occupation and equipment on a reinforced concrete ship.Influence of composition expanded clay concrete on its properties has been found. At the first stage, were investigated lightweight concrete based on the processed by hydrophobisator gravel. In the second phase were investigated concretes with silica fume. Planned three-factor experiment was conducted. Such concrete composition were varied: the amount of cement (500-600 kg/m 3 ), silica fume (0-50 kg/m 3 ) and superplasticizer S-3 (0.5-1%). Concretes were made from equal mixtures mobility P2 (4-6 cm). It is found that the compressive strength of concrete is in the range of 32 to 43 MPa. By increasing the amount of cement strength increases, but this increase is not linear type. Tensile strength of concrete was in the range of 5.6 to 7.0 MPa. Water-resistant concrete was in the range of W4 to W12. When administered to 30-35 kg/m 3 silica fume of about 2 MPa increases compressive strength expanded clay lightweight concrete and 0.3 MPa the tensile strength increases with bending. By increasing the amount of additive S-3 is significantly increased compressive strength concrete. However, the introduction of additives increases tensile strength is less when bending. Due to the introduction of the optimal amount of silica fume and S-3 water resistance of concrete is increased by about 40-50%.Thus, the modified expanded clay lightweight concrete has a relatively low bulk density with high strength. They can be used in thin-walled construction of hydraulic structures, in particular floating docks, houses and hotels.Keywords: shipbuilding reinforced concrete, expanded clay lightweight concrete, silica fume, plasticizer, experimental and statistical modeling.

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“… Modelo obtenido por estudio noruego 37 En un estudio noruego realizado en plataformas de combustible en el mar del Norte 37 , el ingreso de cloruros obedece a una versión modificada de la expresión de la segunda Ley de Fick donde el coeficiente de difusión varía con el tiempo, tal y como se explica más adelante. La expresión es la siguiente:…”

Section: Fig418 Obtención Del Contenido De Saturación De Clorurosunclassified

“…Sin embargo, se ha confirmado a través de ensayos de laboratorio e inspecciones de campo en estructuras expuestas a los cloruros durante 37 años que la resistencia a la penetración de los cloruros se mejora con el tiempo (Maage et al 1996(Maage et al ,1999) y obedece a la expresión matemática 37 :…”

Section: El Tiempounclassified

Corrosión de armaduras en el hormigón armado en ambiente marino aéreo

García¹

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AGRADECIMIENTOSQuiero expresar mi sincero agradecimiento a Mª Pilar Alaejos, directora de esta tesis, por su dedicación y respaldo, por guiarme a lo largo de la investigación, y por creer en mí y en el buen fin de este trabajo. Gracias por reforzar mi autoestima en momentos clave y por hacerme creer que era capaz de conseguirlo.También quiero dar las gracias a la Dirección General del CEDEX, especialmente al Laboratorio Central de Estructuras y Materiales, por sus iniciativas para fomentar la formación de postgrado y la realización de tesis doctorales.Se agradece a Puertos del Estado el interés por el tema planteado y por la financiación del estudio que ha permitido la realización de esta tesis.Del mismo modo quiero expresar mi agradecimiento a las Autoridades Portuarias a las que pertenecen los Muelles inspeccionados, por su inestimable colaboración y las facilidades ofrecidas para poder llevar a cabo el trabajo de campo, sin el cual el estudio experimental no se hubiera podido desarrollar.Dar las gracias especialmente a Alicia Rosado y Manuel Rivas, secretaria y director del Departamento de Construcción de la Escuela de Ingenieros de Caminos de Madrid, por su información puntual y por su diligencia atenta y eficiente para resolver todas mis dudas.A mi predecesor Miguel Ángel Bermúdez por iniciarme en el tema y ser, a través de su tesis, un guía incuestionable en mi trabajo. Quiero expresar mi reconocimiento al personal del Laboratorio Central de Estructuras yMateriales del CEDEX, por su buen hacer y el apoyo prestado durante este tiempo.Mención especial merece Víctor Lanza, por su ayuda incondicional. Tampoco puedo olvidarme de compañeros como Félix Martín, Carlos Gimeno, Alberto Velasco, Marta Sanchez, Javier Pintado y Antonio Rodríguez.Por último y desde lo más profundo, agradecer el aliento incondicional a mis padres, a mis amigos, a todos aquellos que con palabras de ánimo han mantenido mi ilusión a lo largo del camino. Y sobre todo, a mi compañero de viaje Kike y a mi hijo Mateo, por su compresión, por su amor y por todo el tiempo que he dejado de pasar con ellos.

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In-field performance of North Sea offshore platforms with regard to chloride resistance

Cited by 27 publications

References 1 publication

Durability of Concrete Structures

Durability of Concrete Structures

Untitled

Corrosión de armaduras en el hormigón armado en ambiente marino aéreo

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