Barcelona, Spain
Barcelona, Spain

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Lisbona A.,Tecnalia | Vegas I.,Tecnalia | Ainchil J.,FCC Construccion
Journal of Materials in Civil Engineering | Year: 2012

Two investigative stages are presented in this study, which aim to establish basic standards for the use of calcined paper sludge (CPS) in the stabilization of soils. The soils were stabilized with CPS and with mixtures of CPS and cement (C). The total percentage of binder was between 3 and 6% by weight. The blending ratios (by weight) of the CPS:C mixtures were 50:50 and 25:75. The first stage took place in the laboratory, and the second stage, in the field, involved in situ stabilization of 250 m of subgrade using dry-mix methods. The bearing capacity of the stabilized soils was determined in the laboratory. In the second stage, the densities of the subgrade were measured in the field following compaction and deflections at 7 days. Furthermore, the evolution of its unconfined compressive strength (UCS) was measured over 90 days. The results reveal optimal mechanical behavior of the stabilized soil at CPS:C ratios of approximately 25:75. © 2012 American Society of Civil Engineers.

Carrera J.L.,Road General Direction Ministry of Fomento | Leira J.A.,F.C.C. Construccion
Landslides and Engineered Slopes. Experience, Theory and Practice | Year: 2016

In the region of Asturias in the north of Spain the last stretch of the Cantabrico Motorway has recently been opened. As part of the tunnel excavation for this motorway, a vertical excavation has been carried out in a natural hill. A pile wall-with several anchorage lines-was initially designed to contain the terrain but the ground conditions that were initially expected turned out to be different in the field. The position of the rock level is lower than what was thought and important horizontal movements of the pile wall have been recorded, with signs of instability. It is necessary to reconsider the initial design with an increase in the number of anchorages designed and to monitor the movements of the pile wall. Finally, with the development of proper numerical analysis, a reinforcement of the ground in the extrados of the pile wall is carried out, with the objective of obtaining an "equivalent cohesion" in the ground, and also to reduce the lateral pressure on the pile wall. This paper describes the process for obtaining a final stable situation of the natural hill and the pile wall, the ground characterization and monitoring of the movements that took place. © 2016 Associazione Geotecnica Italiana, Rome, Italy.

Etxeberria M.,Polytechnic University of Catalonia | Ainchil J.,FCC Construccion | Perez M.E.,Polytechnic University of Catalonia | Gonzalez A.,Polytechnic University of Catalonia
Construction and Building Materials | Year: 2013

It is known that 50% of recycled aggregate is fine aggregate, however its use is still limited. In this research work the use of recycled fine aggregates for Controlled Low Strength Materials (CLSMs) production was analysed. Self-compacting and flowable CLSM material was composed of cement, fine aggregates, water and an air-entrained admixture. Adequate mix proportions of CLSM material produced with recycled fine aggregates were validated according to the minimum requirements of ASTM and the results obtained by CLSM produced with natural fine aggregates. Bleeding and penetration resistance for fresh state and density, porosity and absorption in hardened strength of optimum mix proportions of all CLSM mixtures with recycled aggregates were also validated. © 2013 Elsevier Ltd. All rights reserved.

Martinez-Calzon J.,MC2 Ingenieria | Gomez-Hermoso J.,FCC Construccion | De Guevara G.L.,MC2 Ingenieria | Rodriguez-Munoz D.,MC2 Ingenieria | And 2 more authors.
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2014

Madrid Stadium, completed and assigned to athletics in 1992,1 consists of a single grandstand of large seating capacity. In 2004, the City Council of Madrid undertook the development of an expansion project for this site to convert this into a football stadium with a capacity for 70 000 spectators. The design of the stadium also took into account the possibility of transforming the structure and facilities of the building for use as an athletics stadium should the city of Madrid host Olympic Games in the future. The foundation is made up of castin-place executed piles, with up to 1500 mm diameter and 40 m length. Integrity tests were done. Micropiles were necessary to reinforce the current stadium's foundation to bear the loads arising from the new structure. The structure of the new stadium is mainly composed of radially placed rigid frame structures that together with the existing grandstand resulted in a completely closed stadium. Precast concrete steppings are placed over these rigid frame structures. Beneath these elements there are reinforcedconcrete or post-tensioned slabs that define the building's floors. The entire structure is surrounded by perimeter walls that constitute the building enclosure. Finally, the stadium is covered with a roof structure executed with a heavy lifting system, consisting of pairs of radial pre-stressed cables connecting the outer compression ring with the inner tension ring and covering the stands with pre-stressed textile membranes. © 2014 Publishing Technology.

Llanos F.F.,FCC Construccion | Aguilar J.R.J.,FCC Construccion | De Argote Cervera J.I.D.,FCC Construccion
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2014

The new bridge over the Danube is part of the Pan-European Corridor IV that joins Turkey with Germany. The main feature of this new bridge is that both railway traffic and highway traffic cross the Danube River between Vidin (Bulgaria) and Calafat (Rumania), through this single bridge. It is a precast segmental structure and the main bridge can be divided into two parts: a continuous extradosed structure with spans of 180 m length in the navigable channel and, a continuous bridge with 80 m long span in the non-navigable channel. The main bridge is 31,35 m wide. The cross section of the bridge comprises a single box-girder of 4,50 m depth. Segmental balanced cantilever construction method was chosen for this project. The precast segments were assembled using a launching girder in the non-navigable channel and using a trolley crane in the navigable channel. The key construction methodology elements used in the main bridge are as follows: • Bored piles with a diameter of 2 m were drilled from the Danube River using maritime methods. The maximum pile length is 80 m. • Heavy lifting operations with 240 t capacity for the erection of the extradosed bridge segments. • Vessel impact protection construction comprising 152 heavy lifting operations with precast elements of up to 140 t weight, 10 m length, and 1 m thickness. • Innovative saddles for the extradosed, standard internal prestressing cables in the pylon and couplers for the extradosed stay cables.

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