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From a construction point of view, neighborhoods with residents living at or below the poverty threshold are characterized by low energy efficiency buildings, in which people live in acoustic discomfort with no viable options for home improvements, as they usually can not afford the materials and labor costs associated. An alternative to this is to use low-cost insulating elements made of non-conventional materials with acceptable acoustic properties. Given that household materials at their end-of-life (EoLHM) are free of costs and available also to the more disadvantaged population, they can be used to build acoustic panels for such contexts. This approach embraces several benefits since it reduces the amount of waste produced, the footprint deriving from the extraction of new raw materials and, by highlighting the potential of the EoLHM, discourages the abandonment of waste. In this paper, the acoustic properties of EoLHM, such as cardboard, egg-cartons, clothes, metal elements and combinations of them, are investigated by means of the impedance tube technique. The measured sound absorption coefficient and transmission loss have shown that EoLHM can be used for the realization of acoustic panels. However, since none of the analyzed materials shows absorbing and insulating properties at the same time, EoLHM must be wisely selected. This innovative approach supports the circular economy and the improvement for the living condition of low-income households.
Manuela Neri; Elisa Levi; Eva Cuerva; Francesc Pardo-Bosch; Alfredo Zabaleta; Pablo Pujadas. Sound Absorbing and Insulating Low-Cost Panels from End-of-Life Household Materials for the Development of Vulnerable Contexts in Circular Economy Perspective. Applied Sciences 2021, 11, 5372 .
AMA StyleManuela Neri, Elisa Levi, Eva Cuerva, Francesc Pardo-Bosch, Alfredo Zabaleta, Pablo Pujadas. Sound Absorbing and Insulating Low-Cost Panels from End-of-Life Household Materials for the Development of Vulnerable Contexts in Circular Economy Perspective. Applied Sciences. 2021; 11 (12):5372.
Chicago/Turabian StyleManuela Neri; Elisa Levi; Eva Cuerva; Francesc Pardo-Bosch; Alfredo Zabaleta; Pablo Pujadas. 2021. "Sound Absorbing and Insulating Low-Cost Panels from End-of-Life Household Materials for the Development of Vulnerable Contexts in Circular Economy Perspective." Applied Sciences 11, no. 12: 5372.
This article describes the design and construction of the structural rehabilitation of the bituminous pavement of four roundabouts by means of the arrangement of a 12 cm layer of vibrated concrete with fibres with very close joints (technique known as "thin whitetopping"). The roundabouts, which belong to the N-II National Road as it passes through La Jonquera (Spain), are subject to high levels of heavy vehicle traffic (IMDp > 4,000 heavy vehicles/day). In the project phase, the causes of deterioration of the original road surface were studied, its remaining bearing capacity was characterised and the thickness of concrete to be used was calculated. In the most damaged areas, the bituminous mixture was completely replaced by a lower quality concrete which was adhered to the concrete of the reinforcement by means of metal connectors. In addition, a detailed design of the transitions between the rehabilitated and the existing pavement and the arrangement of the joints was also carried out. Throughout the document, the different tasks carried out for the design and construction of the adopted solution are described in detail and, finally, design and construction recommendations are provided based on the results obtained. Keywords: Concrete, concrete bonding, Concrete with fibres, Reinforcement of pavements with concrete, Fuel resistance, Whitetopping.
Ruben Lopez Carreno; Sergio Carrascon Ortiz; Antonio Aguado DE Cea; Pablo Pujadas Alvarez. REHABILITATION OF THE PAVEMENT OF FOUR ROUNDABOUTS BY MEANS OF THIN CONCRETE REINFORCEMENT ("THIN WHITETOPPING"). DYNA 2021, 96, 250 -253.
AMA StyleRuben Lopez Carreno, Sergio Carrascon Ortiz, Antonio Aguado DE Cea, Pablo Pujadas Alvarez. REHABILITATION OF THE PAVEMENT OF FOUR ROUNDABOUTS BY MEANS OF THIN CONCRETE REINFORCEMENT ("THIN WHITETOPPING"). DYNA. 2021; 96 (3):250-253.
Chicago/Turabian StyleRuben Lopez Carreno; Sergio Carrascon Ortiz; Antonio Aguado DE Cea; Pablo Pujadas Alvarez. 2021. "REHABILITATION OF THE PAVEMENT OF FOUR ROUNDABOUTS BY MEANS OF THIN CONCRETE REINFORCEMENT ("THIN WHITETOPPING")." DYNA 96, no. 3: 250-253.
In a world increasingly aware of the environmental cost of the current production/ consumption model, the use of sustainable practices to reduce our environmental impact as a society becomes imperative. One way to reduce this impact is to increase the reuse of materials that are considered, by current definitions of ”waste”, at their end of life. End-of-Life Household Materials (EoLHM) can be defined as household waste materials that still possess exploitable properties, thus making them suitable for reuse. There are several studies in the literature that address the recycling of these materials. When it comes to their reuse, unfortunately, only a limited number of studies are available. This paper aims to fill this gap by investigating the possibility to convert EoLHM, such as clothes or packaging, into low-cost thermal insulating materials for the improvement of the indoor thermal comfort in buildings, especially for households at risk of suffering from energy poverty. For this purpose, a comprehensive literature review and a qualitative analysis of both commercial and EoLHM are proposed. Commercial thermal insulating materials analysis is used as a reference to measure the performance of EoLHM. Important aspects to be considered when choosing suitable EoLHM for a smart conversion and reuse are also investigated. The most important outcome of this investigation is the comprehension that the conversion of EoLHM into insulating material is possible, and it implies a direct reduction in waste production, with environmental benefits and positive social implications. However, some aspects such as adaptability, life expectancy, collection and storage are, at present, in need of further thinking and development to make the EoLHM reuse and re-conversion processes viable on a large (neighborhood/city) scale.
Manuela Neri; Mariagrazia Pilotelli; Marco Traversi; Elisa Levi; Edoardo Piana; Mariasole Bannó; Eva Cuerva; Pablo Pujadas; Alfredo Guardo. Conversion of End-of-Life Household Materials into Building Insulating Low-Cost Solutions for the Development of Vulnerable Contexts: Review and Outlook towards a Circular and Sustainable Economy. Sustainability 2021, 13, 4397 .
AMA StyleManuela Neri, Mariagrazia Pilotelli, Marco Traversi, Elisa Levi, Edoardo Piana, Mariasole Bannó, Eva Cuerva, Pablo Pujadas, Alfredo Guardo. Conversion of End-of-Life Household Materials into Building Insulating Low-Cost Solutions for the Development of Vulnerable Contexts: Review and Outlook towards a Circular and Sustainable Economy. Sustainability. 2021; 13 (8):4397.
Chicago/Turabian StyleManuela Neri; Mariagrazia Pilotelli; Marco Traversi; Elisa Levi; Edoardo Piana; Mariasole Bannó; Eva Cuerva; Pablo Pujadas; Alfredo Guardo. 2021. "Conversion of End-of-Life Household Materials into Building Insulating Low-Cost Solutions for the Development of Vulnerable Contexts: Review and Outlook towards a Circular and Sustainable Economy." Sustainability 13, no. 8: 4397.
Discarded polyethylene terephthalate (PET) bottles have damaged our ecosystem. Problems of marine fauna conservation and land fertility have been related to the disposal of these materials. Recycled fibre is an opportunity to reduce the levels of waste in the world and increase the mechanical performance of the concrete. PET as concrete reinforcement has demonstrated ductility and post-cracking strength. However, its performance could be optimized. This study considers a statistical-experimental analysis to evaluate recycled PET fibre reinforced concrete with various fibre dose and aspect ratio. 120 samples were experimented under workability, compressive, flexural, and splitting tensile tests. The results pointed out that the fibre dose has more influence on the responses than its fibre aspect ratio, with statistical relation on the tensional toughness, equivalent flexural strength ratio, volumetric weight, and the number of fibres. Moreover, the fibre aspect ratio has a statistical impact on the tensional toughness. In general, the data indicates that the optimal recycled PET fibre reinforced concrete generates a superior performance than control samples, with an improvement similar to those reinforced with virgin fibres.
Alejandro Meza; Pablo Pujadas; Laura Montserrat Meza; Francesc Pardo-Bosch; Rubén D. López-Carreño. Mechanical Optimization of Concrete with Recycled PET Fibres Based on a Statistical-Experimental Study. Materials 2021, 14, 240 .
AMA StyleAlejandro Meza, Pablo Pujadas, Laura Montserrat Meza, Francesc Pardo-Bosch, Rubén D. López-Carreño. Mechanical Optimization of Concrete with Recycled PET Fibres Based on a Statistical-Experimental Study. Materials. 2021; 14 (2):240.
Chicago/Turabian StyleAlejandro Meza; Pablo Pujadas; Laura Montserrat Meza; Francesc Pardo-Bosch; Rubén D. López-Carreño. 2021. "Mechanical Optimization of Concrete with Recycled PET Fibres Based on a Statistical-Experimental Study." Materials 14, no. 2: 240.
In the context of the evaluation of the load-bearing capacity of a steel fibre reinforced concrete (SFRC) elevated slab recently built in northern Italy, this paper presents the study addressing the effects of fibre distribution and orientation. An extensive experimental programme was carried out in a collaboration between Politecnico di Milano and Universitat Politècnica de Catalunya. The programme included mechanical tests on four shallow beams and six notched standard beams. Additionally, uniaxial tensile tests (UTTs), double edge wedge splitting tests (DEWSTs) and double punching tests (DPTs) on 192 drilled core samples extracted from the shallow beams were performed. Inductive tests, measuring the self-induction change that occurs when a SFRC sample is placed inside a coil, were performed on all samples subjected to DPTs to assess fibre distribution. This paper compares direct and indirect tensile tests for the definition of the FRC post-cracking constitutive law, highlighting advantages and disadvantages of each test type. A comparison between standard and non-standard mechanical tests is also presented. Mechanical and non-destructive tests on drilled core samples extracted in different directions and at different locations have allowed the evaluation of the effects of fibre distribution and fibre orientation which provide an estimation of the possibility of using these tests as simplified tests for production control.
Paolo Martinelli; Matteo Colombo; Pablo Pujadas; Albert de la Fuente; Sergio Cavalaro; Marco di Prisco. Characterization tests for predicting the mechanical performance of SFRC floors: identification of fibre distribution and orientation effects. Materials and Structures 2021, 54, 1 -13.
AMA StylePaolo Martinelli, Matteo Colombo, Pablo Pujadas, Albert de la Fuente, Sergio Cavalaro, Marco di Prisco. Characterization tests for predicting the mechanical performance of SFRC floors: identification of fibre distribution and orientation effects. Materials and Structures. 2021; 54 (1):1-13.
Chicago/Turabian StylePaolo Martinelli; Matteo Colombo; Pablo Pujadas; Albert de la Fuente; Sergio Cavalaro; Marco di Prisco. 2021. "Characterization tests for predicting the mechanical performance of SFRC floors: identification of fibre distribution and orientation effects." Materials and Structures 54, no. 1: 1-13.
The paper presents an experimental program carried out to check the load bearing capacity of a steel fibre reinforced concrete (SFRC) floor in northern Italy. The extensive mechanical characterization focused on the suitability of 3 non-standardized test methods for quality control and tensile constitutive curve assessment was performed, this consisting of: uniaxial tensile test (UTT), double edge wedge splitting test (DEWST) and double punching test (DPT) to characterize the post-cracking mechanical properties of the material. The joint experimental programme, carried out at the Politecnico di Milano and at the Universitat Politècnica de Catalunya, included the flexural characterization of four shallow beams (1.5 × 0.5 × 0.25 m3) and six standard notched beams (0.55 × 0.15 × 0.15 m3). All the samples were produced from the same batch and with the same SFRC mix which was applied for the floor. After that, 192 cores were drilled from the shallow beams and subjected to either UTTs, DEWSTs or DPTs. The stress level, the scatter and the constitutive curves derived from the non-standardized tests were identified and analysed. The calculated constitutive curves were used to predict the behaviour of the shallow beams.
Paolo Martinelli; Matteo Colombo; Albert de la Fuente; Sergio Cavalaro; Pablo Pujadas; Marco di Prisco. Characterization tests for predicting the mechanical performance of SFRC floors: design considerations. Materials and Structures 2021, 54, 1 -16.
AMA StylePaolo Martinelli, Matteo Colombo, Albert de la Fuente, Sergio Cavalaro, Pablo Pujadas, Marco di Prisco. Characterization tests for predicting the mechanical performance of SFRC floors: design considerations. Materials and Structures. 2021; 54 (1):1-16.
Chicago/Turabian StylePaolo Martinelli; Matteo Colombo; Albert de la Fuente; Sergio Cavalaro; Pablo Pujadas; Marco di Prisco. 2021. "Characterization tests for predicting the mechanical performance of SFRC floors: design considerations." Materials and Structures 54, no. 1: 1-16.
Concrete bonded whitetoppings and overlays usually fail due to a loss of bond between the layers as a consequence of direct actions (traffic loads) or indirect actions (temperature differences or shrinkage in the layers). These actions generate stresses in the interface that may exceed the strength capacity of the union between layers. This paper proposed an innovative solution for this problem that consisted of placing mechanical connectors in the overlay interfaces to provide them with post-cracking strength and maintaining the monolithic response of the pavement. Three experimental programs on real-scale pavements with two types of mechanical connectors were studied under heavy traffic in terms of structural performance. Findings reveal that this technique might be an excellent solution to the problem of interfacial debonding.
Rubén-Daniel López-Carreño; Sergio Carrascón; Antonio Aguado; Pablo Pujadas. Mechanical Connectors to Enhance the Interfacial Debonding of Concrete Overlays. Applied Sciences 2020, 10, 1 .
AMA StyleRubén-Daniel López-Carreño, Sergio Carrascón, Antonio Aguado, Pablo Pujadas. Mechanical Connectors to Enhance the Interfacial Debonding of Concrete Overlays. Applied Sciences. 2020; 10 (11):1.
Chicago/Turabian StyleRubén-Daniel López-Carreño; Sergio Carrascón; Antonio Aguado; Pablo Pujadas. 2020. "Mechanical Connectors to Enhance the Interfacial Debonding of Concrete Overlays." Applied Sciences 10, no. 11: 1.
Assuming specific behavior models, the variety of design codes currently used for the design of concrete beams inevitably results in different solutions, ensuring service during the whole expected lifetime with a maximum functional quality and safety. However, from a sustainable design perspective, such differences may have remarkable environmental impacts. This paper analyses if the approach of the newest design code, i.e., the Model Code, leads to a reduction in resource consumption and greenhouse gas emissions (GHG) over the life-cycle of concrete beams. To do so, a comparative analysis of the environmental impact of concrete beams was carried out depending on the reference code used for its design (i.e., EHE-08 or Model Code). The results show that the reduction of reinforcing steel is a basic objective to minimize the life cycle environmental impacts of concrete beams. Every country may have its own design codes and, thus, the reinforcing steel use can vary for structures subjected to the same loads and with equivalent structural reliability. Hence, regulations play a key role in the sustainability of construction assets. Conclusions depend on the beam length (L) and height (h) and characteristic compressive strength (fck). For short beams (4 m), the greater the h, the greater the reinforcement difference between the two codes. With regard to beams of 8 m, these differences can lead to varying steel and GHG savings, e.g., up to 5.0% with MC-2010 (h = 0.6 m and fck ≤ 35 MPa), almost 40% with EHE – 08 (h = 1.0 m and 35 MPa < fck ≤ 50 MPa) and more than 30% with EHE–08 (h = 0.6 m and 35 MPa < fck ≤ 50 MPa). For long beams (L = 12.0 m), steel consumption is 0.3–19% lower when the beam is designed with EHE-08, and this difference decreases as fck increases.
C. Almirall; A. Petit-Boix; D. Sanjuan-Delmás; A. De La Fuente; P. Pujadas; A. Josa. Environmental effects of using different construction codes applied to reinforced concrete beam designs based on Model Code 2010 and Spanish Standard EHE-08. Engineering Structures 2018, 179, 438 -447.
AMA StyleC. Almirall, A. Petit-Boix, D. Sanjuan-Delmás, A. De La Fuente, P. Pujadas, A. Josa. Environmental effects of using different construction codes applied to reinforced concrete beam designs based on Model Code 2010 and Spanish Standard EHE-08. Engineering Structures. 2018; 179 ():438-447.
Chicago/Turabian StyleC. Almirall; A. Petit-Boix; D. Sanjuan-Delmás; A. De La Fuente; P. Pujadas; A. Josa. 2018. "Environmental effects of using different construction codes applied to reinforced concrete beam designs based on Model Code 2010 and Spanish Standard EHE-08." Engineering Structures 179, no. : 438-447.
There are very few methods that can be used for the assessment of pavement conditions. Their application to urban networks tends to be complex, given the wide variety of urban pavement types (concrete, asphalt, and paving tiles) and their different functions (traffic, pedestrian, or both). A flexible method that can address the complexity of different areas is therefore proposed in this paper through a case study of pavement conditions. Hence the interest of this new approach for pavement management that employs a multi-criteria method adaptable to various urban environments: the Integrated Value Model for Structural Assessment (MIVES). It incorporates the Value Function (VF) concept in an Analytic Hierarchy Process (AHP), combining both Multi-criteria Decision Making and Multi-Attribute Utility Theory. The methodology is presented and its sensitivity is evaluated by means of a case study in the city of Barcelona. The quality index of various pavements is assessed through a survey of pavement distresses in a systematic categorisation of urban network pavement categories that is accurate, consistent, and repeatable.
P. Pujadas; S.H.P. Cavalaro; A. Aguado. Mives multicriteria assessment of urban-pavement conditions: application to a case study in Barcelona. Road Materials and Pavement Design 2018, 20, 1827 -1843.
AMA StyleP. Pujadas, S.H.P. Cavalaro, A. Aguado. Mives multicriteria assessment of urban-pavement conditions: application to a case study in Barcelona. Road Materials and Pavement Design. 2018; 20 (8):1827-1843.
Chicago/Turabian StyleP. Pujadas; S.H.P. Cavalaro; A. Aguado. 2018. "Mives multicriteria assessment of urban-pavement conditions: application to a case study in Barcelona." Road Materials and Pavement Design 20, no. 8: 1827-1843.
Installing utility pipelines generates a significant amount of trench arisings, which are usually transported to landfills instead of being reused as backfill material. This practice generates CO2 emissions and wastes raw materials. This paper presents a more sustainable solution, an eco-trench, which is based on re-using trench arisings as backfill and adding a top layer of expansive concrete to improve the eco-trench’s structural performance. The technical feasibility of the eco-trench was evaluated through a finite element model, which identified the degree of expansion in concrete required to avoid failure or subside the stresses caused by traffic. The potential expansion of concrete was measured under confined conditions in the laboratory by means of a novel test developed for this purpose. The results showed that adding calcium oxide generates the required internal stress. The results were then confirmed in a pilot experience.
A. Blanco; P. Pujadas; C. Fernández; S. H.P. Cavalaro; A. Aguado. Eco-trench: a novel trench solution based on reusing excavated material and a finishing layer of expansive concrete. Materiales de Construcción 2017, 67, 135 .
AMA StyleA. Blanco, P. Pujadas, C. Fernández, S. H.P. Cavalaro, A. Aguado. Eco-trench: a novel trench solution based on reusing excavated material and a finishing layer of expansive concrete. Materiales de Construcción. 2017; 67 (328):135.
Chicago/Turabian StyleA. Blanco; P. Pujadas; C. Fernández; S. H.P. Cavalaro; A. Aguado. 2017. "Eco-trench: a novel trench solution based on reusing excavated material and a finishing layer of expansive concrete." Materiales de Construcción 67, no. 328: 135.
The Temple of Sagrada Familia presents singularities in terms of both the original design by architect Antoni Gaudí and the duration of the construction, which started more than 120 years ago. In fact, its design was conceived before the development of reinforced concrete. Therefore, the construction materials and processes have evolved to adapt new technologies without compromising the vision of Gaudí. This willingness to maintain the original designs has obliged the technicians to resolve details that were not defined in the project, including the issue of how to cast elements at great heights and with a high amount of reinforcement. In this context, the possibility of using self-compacting concrete (SCC) emerged. This paper describes the different experiences in the Temple of Sagrada Familia with SCC, from requirements that led to using this material to the design of the mixes and the casting of the elements in situ.
Gemma Rodríguez; Ana Blanco; Pablo Pujadas; Antonio Aguado. Self-Compacting Concrete in the Temple of Sagrada Familia. Journal of Architectural Engineering 2017, 23, 04017005 .
AMA StyleGemma Rodríguez, Ana Blanco, Pablo Pujadas, Antonio Aguado. Self-Compacting Concrete in the Temple of Sagrada Familia. Journal of Architectural Engineering. 2017; 23 (3):04017005.
Chicago/Turabian StyleGemma Rodríguez; Ana Blanco; Pablo Pujadas; Antonio Aguado. 2017. "Self-Compacting Concrete in the Temple of Sagrada Familia." Journal of Architectural Engineering 23, no. 3: 04017005.
The flexural creep of plastic fiber reinforced concrete (PFRC) is a controversial issue since significant doubts regarding the suitability of this type of fiber and its influence in the long-term behavior of the material still exist. The objective of this paper is to evaluate the post-cracking creep response of PFRC beams under flexural load in comparison with that of steel fiber reinforced concrete (SFRC) beams. The aim is to explore how the pre-crack opening and the environmental condition affect the long term behavior of each material and identify differences. An experimental program was conducted with 30 concrete beams with dimension of 150 × 150 × 600 mm reinforced with plastic or steel fibers subjected to a 4-point bending creep test for 5 months under 2 environmental conditions. Results showed that the flexural creep coefficient of PFRC is 2 times bigger than that of SFRC. Despite that, the use of plastic fibers as reinforcement should not be rejected as long as the additional creep is considered in the design and the crack widths are limited to reduce the risk of tertiary creep.
P. Pujadas; Ana Blanco; S. Cavalaro; A. de la Fuente; A. Aguado. The need to consider flexural post-cracking creep behavior of macro-synthetic fiber reinforced concrete. Construction and Building Materials 2017, 149, 790 -800.
AMA StyleP. Pujadas, Ana Blanco, S. Cavalaro, A. de la Fuente, A. Aguado. The need to consider flexural post-cracking creep behavior of macro-synthetic fiber reinforced concrete. Construction and Building Materials. 2017; 149 ():790-800.
Chicago/Turabian StyleP. Pujadas; Ana Blanco; S. Cavalaro; A. de la Fuente; A. Aguado. 2017. "The need to consider flexural post-cracking creep behavior of macro-synthetic fiber reinforced concrete." Construction and Building Materials 149, no. : 790-800.
The behavior of concrete subjected to shear can be significantly improved by the addition of fibers, which may partially or totally substitute the traditional steel stirrups (also known as links). Design recommendations include formulations to account for the contribution of the fibers. However, these formulations take the results of small-scale bending tests as input parameters. The main reason for that is the lack of standardized tests and the difficulty to assess direct shear in fiber reinforced concrete (FRC) both for the design and for the quality control. The present study proposes a test for the characterization of the post-cracking shear response of FRC. The test is validated through an experimental program with conventional concrete and FRC. The influence of different parameters (geometry of the specimen, the type and the content of fiber) is assessed and a comparison is made between the push-off test and the one proposed here. Results of an in-depth statistical analysis indicate that the latter is a simpler and valid alternative to evaluate the post-cracking shear response of FRC.
A. Blanco; C. Aire; P. Pujadas; S.H.P. Cavalaro. Luong test for the characterization of the shear post-cracking response of fiber reinforced concrete. Construction and Building Materials 2017, 149, 207 -217.
AMA StyleA. Blanco, C. Aire, P. Pujadas, S.H.P. Cavalaro. Luong test for the characterization of the shear post-cracking response of fiber reinforced concrete. Construction and Building Materials. 2017; 149 ():207-217.
Chicago/Turabian StyleA. Blanco; C. Aire; P. Pujadas; S.H.P. Cavalaro. 2017. "Luong test for the characterization of the shear post-cracking response of fiber reinforced concrete." Construction and Building Materials 149, no. : 207-217.
A meaningful contribution to the evaluation of heterogeneous public investments is described in this article. The proposed methodology provides a step towards sustainable urban planning in which decisions are taken according to clear, consistent and transparent criteria assisted by the MIVES multi-criteria analysis framework. The MIVES methodology combines multi-criteria decision making (MCDM) and multi-attribute utility theory (MAUT), incorporating the value function (VF) concept and assigning weights through the analytic hierarchy process (AHP). First, a homogenization coefficient is calculated to develop the Prioritization Index for Heterogeneous Urban Investments (PIHUI), so that non-homogenous alternatives may be comparable. This coefficient measures the need of society to invest in each public project through the consideration of its contribution to the regional balance, the scope of its investment, the evaluation of the current situation and the values of the city. Then, the MIVES multi-criteria framework is used to evaluate the degree to which each investment would contribute to sustainable development. Different economic, environmental and social aspects were considered through a decision framework, constructed with the three aforementioned requirements, five criteria and eight indicators. The case study conducted for the Ecology, Urban Planning and Mobility Area of Barcelona municipal council is presented in this article, showing how this method performs accurate, consistent, and repeatable evaluations.
P. Pujadas; F. Pardo-Bosch; A. Aguado-Renter; A. Aguado. MIVES multi-criteria approach for the evaluation, prioritization, and selection of public investment projects. A case study in the city of Barcelona. Land Use Policy 2017, 64, 29 -37.
AMA StyleP. Pujadas, F. Pardo-Bosch, A. Aguado-Renter, A. Aguado. MIVES multi-criteria approach for the evaluation, prioritization, and selection of public investment projects. A case study in the city of Barcelona. Land Use Policy. 2017; 64 ():29-37.
Chicago/Turabian StyleP. Pujadas; F. Pardo-Bosch; A. Aguado-Renter; A. Aguado. 2017. "MIVES multi-criteria approach for the evaluation, prioritization, and selection of public investment projects. A case study in the city of Barcelona." Land Use Policy 64, no. : 29-37.
Controlled low-strength material (CLSM) is a self-consolidating cementitious material used as backfill in narrow trenches. The high content of aggregates and water in CLSM leads to a special behavior that is closer to soil than concrete. Consequently, mixture proportioning methodologies for conventional concrete do not apply to CLSM. The objective of this paper is to propose a new methodology to achieve the optimal composition that fulfills the flowability and compressive strength requirements of the material. Instead of computing the aggregate or the cement separately, all solid particles in the mixture are considered concurrently to estimate the water content in terms of water-to-solid ratio (W/S). In this way, the compressive strength can be modified without compromising the desired flowability. An example application is presented and an experimental program is conducted to validate this philosophy. The results confirm that the methodology proposed provides compositions that satisfy the main requirements of CLSM, thus representing a contribution to the use of more economical and adequate materials.
P. Pujadas; A. Blanco; Sergio Henrique Pialarissi Cavalaro; A. Aguado. Performance-Based Procedure for the Definition of Controlled Low-Strength Mixtures. Journal of Materials in Civil Engineering 2015, 27, 06015003 .
AMA StyleP. Pujadas, A. Blanco, Sergio Henrique Pialarissi Cavalaro, A. Aguado. Performance-Based Procedure for the Definition of Controlled Low-Strength Mixtures. Journal of Materials in Civil Engineering. 2015; 27 (11):06015003.
Chicago/Turabian StyleP. Pujadas; A. Blanco; Sergio Henrique Pialarissi Cavalaro; A. Aguado. 2015. "Performance-Based Procedure for the Definition of Controlled Low-Strength Mixtures." Journal of Materials in Civil Engineering 27, no. 11: 06015003.
El uso del hormigón reforzado con fibras (HRF) para la fabricación de dovelas de túneles es una práctica en aumento. Sin embargo, aún existe cierta inercia al cambio respecto a la solución tradicional de hormigón armado con armaduras pasivas, pese a haberse demostrado desde el punto de vista técnico y económico que el uso del HRF en esta aplicación es viable y tiene ventajas. Un hecho que pone de manifiesto esta inercia al cambio es que existen numerosas aplicaciones en las que se ha empleado el HRF, en combinación con barras, si bien la contribución resistente de las fibras no se tuvo en cuenta. Esto es principalmente debido a la falta de regulaciones específicas que aborden aspectos de control, producción y diseño de estructuras de HRF. Afortunadamente, a nivel nacional, el Anejo 14 de la instrucción EHE-08 ya plantea unas guías para hacer frente a estos campos y, adicionalmente, el Código Modelo 2010 también presenta una guía para el diseño de estructuras de HRF. Este artículo tiene como objetivos, por una parte, presentar las experiencias más relevantes a nivel internacional del uso de HRF en la ejecución de anillos para el revestimiento de túneles ejecutados con tuneladora y, por otra, plantear un esquema de cálculo para abordar el diseño óptimo del refuerzo de dovelas de HRF. Asimismo, se presentan 3 ejemplos reales en los que se ha empleado el método propuesto. The use of fibre reinforced concrete (FRC) in precast segments for tunnel support is an increasing practice. However, although the suitability of this material seems to be proven at a technical and economic level, there is still some reluctance towards the natural implementation of this material. In fact, in those cases in which fibres were added to concrete, the structural contribution was not taken into account in the design. This is mainly due to the lack of specific regulations to deal with this, as well as other aspects related to the control, production and design of FRC structures. Fortunately, at national level, Annex 14 of the Spanish EHE-08 already proposes guidelines as regards these aspects, and the new Model Code 2010 also considers the FRC as a structural material. This paper aims, on the one hand, to analyse the most important applications of FRC in tunnel linings worldwide and, on the other hand, presents a design methodology which enables the reinforcement configuration of fibre reinforced concrete in precast segments to be optimised. Furthermore, three real examples of application in which this method has been applied are described.
Albert De La Fuente; Ana Blanco; Pablo Pujadas; Antonio Aguado. Diseño óptimo de dovelas de hormigón reforzado con fibras para el revestimiento de túneles. Hormigón y Acero 2014, 65, 267 -279.
AMA StyleAlbert De La Fuente, Ana Blanco, Pablo Pujadas, Antonio Aguado. Diseño óptimo de dovelas de hormigón reforzado con fibras para el revestimiento de túneles. Hormigón y Acero. 2014; 65 (274):267-279.
Chicago/Turabian StyleAlbert De La Fuente; Ana Blanco; Pablo Pujadas; Antonio Aguado. 2014. "Diseño óptimo de dovelas de hormigón reforzado con fibras para el revestimiento de túneles." Hormigón y Acero 65, no. 274: 267-279.
This paper focuses on the study of the influence of flowability and wall-effects of the formwork in the orientation pattern of macro-plastic fibres. In order to identify the preferential orientation of fibres caused by the geometry of slabs, pairs of specimens drilled from PFRC slabs with different width/length – ratio are tested using the multidirectional double punch test (MDPT). The results show that plastic fibres tend to be oriented parallel to the walls or surfaces of the formwork and perpendicular to the flow direction for a free surface flow. The side walls slightly redistribute the fibre orientation, as the transverse dimension of the slabs is reduced. Additionally, a computed tomography (CT-scans) was, for the first time, successfully applied to assess the amount of macro-plastic fibres as well as its distribution and orientation in a prismatic core.
Pablo Pujadas; Ana Blanco; Sergio Henrique Pialarissi Cavalaro; Albert de la Fuente; Antonio Aguado. Fibre distribution in macro-plastic fibre reinforced concrete slab-panels. Construction and Building Materials 2014, 64, 496 -503.
AMA StylePablo Pujadas, Ana Blanco, Sergio Henrique Pialarissi Cavalaro, Albert de la Fuente, Antonio Aguado. Fibre distribution in macro-plastic fibre reinforced concrete slab-panels. Construction and Building Materials. 2014; 64 ():496-503.
Chicago/Turabian StylePablo Pujadas; Ana Blanco; Sergio Henrique Pialarissi Cavalaro; Albert de la Fuente; Antonio Aguado. 2014. "Fibre distribution in macro-plastic fibre reinforced concrete slab-panels." Construction and Building Materials 64, no. : 496-503.
The wide variety of tests currently used for the characterization of fibre reinforced concrete (FRC) only allow a unidirectional characterization (without considering the orientation of the fibres in the matrix). However, from a design-oriented perspective, the anisotropy due to the dispersion and orientation of fibres has to be taken into account when characterizing the mechanical behaviour of the material. In this paper, an alternative to the conventional tests applied for the characterization of FRC is proposed. The multidirectional double punch test (MDPT) consists of a double punch test applied to a cubic specimen. Due to the specimen shape in a single procedure an estimation of the fibre orientation efficiency can be obtained, establishing a link between the mechanical properties of FRC with the fibre orientation. Thereby, this paper represents a meaningful contribution to provide a step towards the development of a rational and design-oriented constitutive model for real-scale structures.
P. Pujadas; Ana Blanco; Sergio Henrique Pialarissi Cavalaro; A. de la Fuente; A. Aguado. Multidirectional double punch test to assess the post-cracking behaviour and fibre orientation of FRC. Construction and Building Materials 2014, 58, 214 -224.
AMA StyleP. Pujadas, Ana Blanco, Sergio Henrique Pialarissi Cavalaro, A. de la Fuente, A. Aguado. Multidirectional double punch test to assess the post-cracking behaviour and fibre orientation of FRC. Construction and Building Materials. 2014; 58 ():214-224.
Chicago/Turabian StyleP. Pujadas; Ana Blanco; Sergio Henrique Pialarissi Cavalaro; A. de la Fuente; A. Aguado. 2014. "Multidirectional double punch test to assess the post-cracking behaviour and fibre orientation of FRC." Construction and Building Materials 58, no. : 214-224.
This paper focuses on the study of the structural response of hyperstatic concrete flat suspended slabs reinforced only with structural plastic macro-fibres. First, the experimental program is described and then the results obtained are presented. The slabs tested maintained a high load level after cracking showing a ductile behaviour with great stress redistribution capacity. Next, the tests were simulated by means of a finite element software with constitutive models according to the specifications of RILEM and the Spanish Structural Concrete Code (EHE). The numerical results in terms of load/mid-span deflection were compared with the experimental results. The predictions provided by the codes and guideline models clearly overestimated the experimental results, which suggests the need to review the constitutive models used for plastic fibre-reinforced concrete.
Pablo Pujadas; Ana Blanco; Sergio Henrique Pialarissi Cavalaro; Antonio Aguado. Plastic fibres as the only reinforcement for flat suspended slabs: Experimental investigation and numerical simulation. Construction and Building Materials 2014, 57, 92 -104.
AMA StylePablo Pujadas, Ana Blanco, Sergio Henrique Pialarissi Cavalaro, Antonio Aguado. Plastic fibres as the only reinforcement for flat suspended slabs: Experimental investigation and numerical simulation. Construction and Building Materials. 2014; 57 ():92-104.
Chicago/Turabian StylePablo Pujadas; Ana Blanco; Sergio Henrique Pialarissi Cavalaro; Antonio Aguado. 2014. "Plastic fibres as the only reinforcement for flat suspended slabs: Experimental investigation and numerical simulation." Construction and Building Materials 57, no. : 92-104.
The combination of fibers with traditional reinforcement may be a very interesting design solution to achieve more durable and economical structures. This paper deals with the analysis of the aforementioned solution through the study at serviceability and ultimate limit states. For this purpose, a total of eighteen concrete slabs were produced (3 × 1 × 0.2 m) with different reinforcement configurations, types of fibers (steel and plastic) and the fiber dosage used (0.25 and 0.50%). These slabs were tested under the configuration of a four point bending test. The results of this experimental campaign were used in the study of the cracking and deflection of the various types of concrete, tackling the analysis from several points of view.
Pablo Pujadas; Ana Blanco; Albert De La Fuente; Antonio Aguado. Cracking behavior of FRC slabs with traditional reinforcement. Materials and Structures 2011, 45, 707 -725.
AMA StylePablo Pujadas, Ana Blanco, Albert De La Fuente, Antonio Aguado. Cracking behavior of FRC slabs with traditional reinforcement. Materials and Structures. 2011; 45 (5):707-725.
Chicago/Turabian StylePablo Pujadas; Ana Blanco; Albert De La Fuente; Antonio Aguado. 2011. "Cracking behavior of FRC slabs with traditional reinforcement." Materials and Structures 45, no. 5: 707-725.