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With increasing construction activity and concrete consumption globally, the economic, environmental, and social impacts of human activities continue to increase rapidly. Therefore, it is imperative to assess the choice and construction of each structure and structural component from a sustainability-based perspective. In this study, such a multi-criteria decision-making approach using the MIVES method is applied to the choice of grouped continuous flight auger (CFA) piles. Different alternatives of CFA piles are studied: length (10 and 20 m), reinforcement (steel cage reinforcement and structural fibers), and aggregates (natural crushed aggregates and recycled aggregate concrete sourced from stationary and mobile recycling plants), based on experimentally verified mix designs. All alternatives were analyzed considering economic, environmental, and social requirements, using a decision-making tree with eight criteria and eleven indicators, with weights assigned by an expert panel. The results of the analysis showed a clear advantage in terms of all three sustainability requirements for CFA piles with steel fibers and recycled aggregate concrete, with all solutions with steel cage reinforcement having significantly lower values of the sustainability index. Such results demonstrate the need for implementing innovative solutions even in structural members such as CFA piles that are often considered in insufficient detail.
Irene Josa; Nikola Tošić; Snežana Marinković; Albert de la Fuente; Antonio Aguado. Sustainability-Oriented Multi-Criteria Analysis of Different Continuous Flight Auger Piles. Sustainability 2021, 13, 7552 .
AMA StyleIrene Josa, Nikola Tošić, Snežana Marinković, Albert de la Fuente, Antonio Aguado. Sustainability-Oriented Multi-Criteria Analysis of Different Continuous Flight Auger Piles. Sustainability. 2021; 13 (14):7552.
Chicago/Turabian StyleIrene Josa; Nikola Tošić; Snežana Marinković; Albert de la Fuente; Antonio Aguado. 2021. "Sustainability-Oriented Multi-Criteria Analysis of Different Continuous Flight Auger Piles." Sustainability 13, no. 14: 7552.
Apart from the importance of Social Sciences and Humanities (SSH) in and of themselves, the potential contribution that they can make to Science, Technology, Engineering and Mathematics (STEM) is huge. Even though some STEM fields have already incorporated SSH elements in their research and education, there are still other disciplines that have not yet approach the intersection between them and SSH. Among these is civil engineering (CE), which has traditionally been set as purely technological and has lacked the inclusion of SSH elements in it. Nonetheless, it is indispensable that engineers have knowledge in SSH to allow them to make decisions more perceptively, realistically and critically. Ultimately, this social understanding can lead them to design and plan solutions that are more socially sustainable. However, there are still no clear guidelines on how to include aspects from social sciences and humanities at the higher education level. This article analyses perceptions, the real status and possible barriers for the incorporation of SSH in the studies of CE. Besides, it analyses and discusses the different methodologies in which engineering students can be introduced to these topics. A triangulation method that combined the use of qualitative and quantitative data was used. Surveys to students, researchers, professors and practitioners were carried out (n=583). Besides, accreditation criteria and CE syllabuses of 100 faculties were reviewed. The analyses showed a dissent between individual perceptions, collective reality and legislative frameworks. Even though the survey responses showed a common agreement concerning the inclusion of SSH, only a minority of CE schools have introduced SSH in their curricula. Besides, accrediting bodies have not yet introduced this as a specific requirement in their criteria. The barriers detected in the incorporation of SSH in CE curricula were: (1) resistance to change, (2) external influences on the curricula, (3) lack of guidelines, (4) misconceptions on what SSH in relation to CE involves. It is necessary to gradually incorporate both hard social skills and soft skills from the beginning of the degree courses and to do so in a transversal way in most of the subjects if professionals and researchers that are capable of designing socially sustainable activities are needed.
I. Josa; A. Aguado. Social sciences and humanities in the education of civil engineers: Current status and proposal of guidelines. Journal of Cleaner Production 2021, 311, 127489 .
AMA StyleI. Josa, A. Aguado. Social sciences and humanities in the education of civil engineers: Current status and proposal of guidelines. Journal of Cleaner Production. 2021; 311 ():127489.
Chicago/Turabian StyleI. Josa; A. Aguado. 2021. "Social sciences and humanities in the education of civil engineers: Current status and proposal of guidelines." Journal of Cleaner Production 311, no. : 127489.
The design of sustainable sewerage infrastructure is fundamental for achieving long-term sustainability goals. Piping systems are essential components in the water supply chain and in waste disposal systems worldwide. Among possible designs for concrete pipes, steel cages consisting of curved rebars have been predominantly used as reinforcement. However, structural fibres have emerged as an attractive technical and economical alternative for substituting steel cages. Due to increasing urbanisation, thousands of kilometres of pipes will be constructed in the near future. At present, decisions regarding reinforcement of concrete pipes are primarily cost-driven. To consider other aspects, it is fundamental to identify and quantify potential sustainability issues properly. Hence, this paper focuses on the sustainability analysis of reinforced concrete pipes using a multi-criteria decision-making method. A model based on criteria, indicators, weights and value functions is developed and calibrated by assessing various concrete reinforcement strategies (steel bars or steel/synthetic fibres). The main contributions of the article are the proposal and application of a model for the case of concrete pipes which can be adapted for other case studies; determining how different typologies of pipes contribute to the overall sustainability of infrastructure systems; and the use and application of a robust and interesting multi-criteria decision-making methodology. The results show that fibre reinforced concrete pipes are promising alternatives in social, economic and environmental terms. Both the model and results are expected to be useful to stakeholders in decision-making processes.
Irene Josa; Albert de la Fuente; Maria Casanovas-Rubio; Jaume Armengou; Antonio Aguado. Sustainability-Oriented Model to Decide on Concrete Pipeline Reinforcement. Sustainability 2021, 13, 3026 .
AMA StyleIrene Josa, Albert de la Fuente, Maria Casanovas-Rubio, Jaume Armengou, Antonio Aguado. Sustainability-Oriented Model to Decide on Concrete Pipeline Reinforcement. Sustainability. 2021; 13 (6):3026.
Chicago/Turabian StyleIrene Josa; Albert de la Fuente; Maria Casanovas-Rubio; Jaume Armengou; Antonio Aguado. 2021. "Sustainability-Oriented Model to Decide on Concrete Pipeline Reinforcement." Sustainability 13, no. 6: 3026.
This paper presents a broad experimental study performed at laboratory and industrial facilities to develop conductive concrete for self-heating and de-icing applications in urban furniture. Self-heating capacity is achieved by the application of electric current through a highly dense matrix containing recycled carbon fibers and graphite flakes. Prisms and slabs were fabricated with two different conductive concretes and electrode configurations to characterize the electrical properties and heating performance. Finally, 3 benches with different electrode disposals were fabricated to assess the heating capacity in real-scale applications. The results presented indicate promising results about the use of recycled carbon fibers for electrothermal concrete applications and identify the electrode configuration that allows the most efficient heat transfer and reduction of temperature gradients within the heated element. Real-scale tests show that the current technology developed is potentially applicable at de-icing applications in climates where temperatures remain within the range of -3 or -5 ºC.
G. Faneca; T. Ikumi; J. M. Torrents; A. Aguado; I. Segura; Leornado Bellas; Gemma Castro; Laura Mera; Jose Mier; Ana García; Angel Varela. Conductive concrete made from recycled carbon fibres for self-heating and de-icing applications in urban furniture. Materiales de Construcción 2020, 70, 223 .
AMA StyleG. Faneca, T. Ikumi, J. M. Torrents, A. Aguado, I. Segura, Leornado Bellas, Gemma Castro, Laura Mera, Jose Mier, Ana García, Angel Varela. Conductive concrete made from recycled carbon fibres for self-heating and de-icing applications in urban furniture. Materiales de Construcción. 2020; 70 (339):223.
Chicago/Turabian StyleG. Faneca; T. Ikumi; J. M. Torrents; A. Aguado; I. Segura; Leornado Bellas; Gemma Castro; Laura Mera; Jose Mier; Ana García; Angel Varela. 2020. "Conductive concrete made from recycled carbon fibres for self-heating and de-icing applications in urban furniture." Materiales de Construcción 70, no. 339: 223.
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.
A model to evaluate the sustainability of structural elements is developed. MIVES is proved to be an adequate sustainability assessment tool in these cases. Girders and trusses made of timber, concrete and steel are analysed. Timber and concrete trusses achieve the highest global sustainability indexes.
I. Josa; O. Pons; A. de la Fuente; A. Aguado. Multi-criteria decision-making model to assess the sustainability of girders and trusses: Case study for roofs of sports halls. Journal of Cleaner Production 2019, 249, 119312 .
AMA StyleI. Josa, O. Pons, A. de la Fuente, A. Aguado. Multi-criteria decision-making model to assess the sustainability of girders and trusses: Case study for roofs of sports halls. Journal of Cleaner Production. 2019; 249 ():119312.
Chicago/Turabian StyleI. Josa; O. Pons; A. de la Fuente; A. Aguado. 2019. "Multi-criteria decision-making model to assess the sustainability of girders and trusses: Case study for roofs of sports halls." Journal of Cleaner Production 249, no. : 119312.
Ignacio Segura; Gerard Faneca; Josep Maria Torrents; Antonio Aguado. Self-sensing concrete made from recycled carbon fibres. Smart Materials and Structures 2019, 28, 105045 .
AMA StyleIgnacio Segura, Gerard Faneca, Josep Maria Torrents, Antonio Aguado. Self-sensing concrete made from recycled carbon fibres. Smart Materials and Structures. 2019; 28 (10):105045.
Chicago/Turabian StyleIgnacio Segura; Gerard Faneca; Josep Maria Torrents; Antonio Aguado. 2019. "Self-sensing concrete made from recycled carbon fibres." Smart Materials and Structures 28, no. 10: 105045.
While economic and environmental aspects of civil engineering have attracted the greatest attention among contemporary academy, its social side has frequently been set aside. However, the social impact that infrastructures have is huge and its analysis and understanding are fundamental. At the same time, social aspects such as culture or human behaviour can have significant effects during the different stages of the lifecycle of infrastructures. Therefore, a better understanding of the connections between civil engineering and society can help to better adapt infrastructures to their contexts, as well as minimise their negative impacts; as a result, this understanding can bring about infrastructures that are more socially sustainable. The scarce studies that have assessed the connection between society and civil engineering have considered this relationship as unidirectional. The real scenario is not so simple. The analysis of this relationship needs to be interdisciplinary, and it is in this context that this paper addresses the analysis of infrastructures and of social sciences from a sociotechnical point of view. We draw on the interrelationships found to propose a conceptual framework with the main objective of providing both practitioners and academics with tools to carry out more sustainable and context-adapted decisions. We classify the fields of civil engineering and social sciences into several different subfields, namely six for infrastructures (transport, water, energy, environment, urban planning and buildings) and twelve for social sciences (culture and history, behaviour and mind, communication and interaction, socioeconomics, juridical sciences, life and health, politics, social problems, social groups, ethics and philosophy, arts and education and innovation). Afterwards, we review the existing literature at the intersection between the various categories. We conclude proposing a framework that can support decisions and actions made at different levels and working areas. The framework includes guidelines for a more holistic consideration of the interaction between infrastructures and society in key activities whereby an improved understanding of the effect of this relationship is often required. The guidelines provide a description of different key areas and can be applied to a wide variety of actions ranging from the development of university curricula to the social impact assessment of projects.
I. Josa; A. Aguado. Infrastructures and society: from a literature review to a conceptual framework. Journal of Cleaner Production 2019, 238, 117741 .
AMA StyleI. Josa, A. Aguado. Infrastructures and society: from a literature review to a conceptual framework. Journal of Cleaner Production. 2019; 238 ():117741.
Chicago/Turabian StyleI. Josa; A. Aguado. 2019. "Infrastructures and society: from a literature review to a conceptual framework." Journal of Cleaner Production 238, no. : 117741.
To make periodic inspections of the buildings is useful to quantify the extent to which deficiencies are severe or not, in order to facilitate decision making and prioritize interventions. In previous works by the authors is proposed a scale of gravity of damages in buildings, with the aim of being of widespread and of common use among professionals. This scale is applied through the direct assignment (DA) methodology, based on the generic definitions of each degree. It is demonstrated and characterized the existence of certain level of variability among technicians, when assigning gravity values using DA methodology, due to the fuzzy condition of the attribute to be evaluated. The main goal of this paper is to propose a methodology to assign values of gravity, based on hazard for people of detachments from the façade, by using measurable parameters and mathematical functions. The final objective is to reduce the level of variability among inspectors when assessing the condition state of a building façade. The proposed methodology is named system of evaluation of façades (SEF). The methodology can be also extended to the assessment of other building systems as structures or roofs and other type of infrastructures.
Félix Ruiz; Antonio Aguado; Carles Serrat; Joan R. Casas. Condition assessment of building façades based on hazard to people. Structure and Infrastructure Engineering 2019, 15, 1346 -1365.
AMA StyleFélix Ruiz, Antonio Aguado, Carles Serrat, Joan R. Casas. Condition assessment of building façades based on hazard to people. Structure and Infrastructure Engineering. 2019; 15 (10):1346-1365.
Chicago/Turabian StyleFélix Ruiz; Antonio Aguado; Carles Serrat; Joan R. Casas. 2019. "Condition assessment of building façades based on hazard to people." Structure and Infrastructure Engineering 15, no. 10: 1346-1365.
Félix Ruiz; Antonio Aguado; Carles Serrat; Joan R. Casas. Optimal metric for condition rating of existing buildings: is five the right number? Structure and Infrastructure Engineering 2019, 15, 740 -753.
AMA StyleFélix Ruiz, Antonio Aguado, Carles Serrat, Joan R. Casas. Optimal metric for condition rating of existing buildings: is five the right number? Structure and Infrastructure Engineering. 2019; 15 (6):740-753.
Chicago/Turabian StyleFélix Ruiz; Antonio Aguado; Carles Serrat; Joan R. Casas. 2019. "Optimal metric for condition rating of existing buildings: is five the right number?" Structure and Infrastructure Engineering 15, no. 6: 740-753.
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.
The alkali-aggregate reaction and the internal sulfate attack are two chemical reactions that lead to expansions in concrete structures. The former is one of the main causes of expansions in concrete dams and has been extensively reported in the literature, whereas the latter is less common and, thus, less studied. The confluence of both reactions in one structure is highly unlikely but still possible as shown by the case of the dam studied in this paper. This gravity dam exhibits significantly high non-recoverable displacements that may only be justified by the superposition of both phenomena. This paper focuses on the study of a concrete dam whose diagnosis hypotheses have changed throughout the years according to evolution of the behavior observed. The hypotheses proposed in the study are validated by conducting numerical analyses through 3D and 2D finite element models. The results confirmed the diagnosis proposed and the capability of the model to reproduce the behavior of the dam.
A. Campos; C.M. López; A. Blanco; A. Aguado. Effects of an internal sulfate attack and an alkali-aggregate reaction in a concrete dam. Construction and Building Materials 2018, 166, 668 -683.
AMA StyleA. Campos, C.M. López, A. Blanco, A. Aguado. Effects of an internal sulfate attack and an alkali-aggregate reaction in a concrete dam. Construction and Building Materials. 2018; 166 ():668-683.
Chicago/Turabian StyleA. Campos; C.M. López; A. Blanco; A. Aguado. 2018. "Effects of an internal sulfate attack and an alkali-aggregate reaction in a concrete dam." Construction and Building Materials 166, no. : 668-683.
Sprayed steel fibre reinforced concrete (SSFRC) is a material that tends to present anisotropy, due to the action of the spraying process inducing preferential fibre orientation. Despite numerous applications worldwide since the 1980s, no study has been found of the assessment of fibre distribution and its influence on the residual tensile strength of SSFRC. This work addresess this issue from a quantitative standpoint through an experimental programme with specimens extracted in various orientations within a SSFRC panel. The fibre content and 3D orientation were quantified using the inductive method and correlated with an indirect tensile behaviour for the same specimen with the Barcelona test. The results confirm the high level of anisotropy of SSFRC. The fibre orientation number parallel to the spraying direction is three times bigger than that found in the perpendicular direction. Similar differences were observed between the residual tensile response measured in those directions. Comparison of test results suggest that the preferential fibre orientation creates weaker planes that favours the increase of crack opening at lower load levels.
Luis Segura-Castillo; Sergio H. P. Cavalaro; Chris Goodier; Antonio Aguado; Simon Austin. Fibre distribution and tensile response anisotropy in sprayed fibre reinforced concrete. Materials and Structures 2018, 51, 29 .
AMA StyleLuis Segura-Castillo, Sergio H. P. Cavalaro, Chris Goodier, Antonio Aguado, Simon Austin. Fibre distribution and tensile response anisotropy in sprayed fibre reinforced concrete. Materials and Structures. 2018; 51 (1):29.
Chicago/Turabian StyleLuis Segura-Castillo; Sergio H. P. Cavalaro; Chris Goodier; Antonio Aguado; Simon Austin. 2018. "Fibre distribution and tensile response anisotropy in sprayed fibre reinforced concrete." Materials and Structures 51, no. 1: 29.
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.
Wind farms are both a renewable energy production alternative and a profitable economic enterprise. At the same time these groups of wind towers can be a social-friendly solution if they solve challenging demands from the society such as integration in landscape, aesthetics, low noise nuisances…\ud \ud This paper presents part of a complete research project that was carried out between 2009 and 2015. First this article presents a new wind tower proposal that has been designed to reduce these social impacts as well as satisfying environmental aspects, economic requirements and boundary conditions such as height, turbine power, soil conditions. This proposal is composed of precast concrete modules joined with high-resistance steel bars that define a post-tension structure. These components define an attractive and transparent tripod that is transversally reinforced with steel profiles. This system holds the Spanish patent “Support structure to wind turbines, number ES 2 319 709 B8” and aims to build 100-120m high towers. At this height there is better wind quality and large turbines of 3 MW can be installed.\ud \ud Second, a sustainability assessment of this new hybrid wind tower has been carried out in order to evaluate its social, environmental and economic impacts compared to other solutions. Steel lattice structures, steel tubular systems, in situ concrete towers and precast concrete structures are the alternatives for wind farms that have been considered. MIVES, a MCDM methodology based on the value function concepts has been used to do this assessment, which has relied upon seminars of experts. This sustainability assessment enabled the identification of the aspects with the lowest sustainability index. These are the maintenance and deconstruction costs and for occupational hazards. Now these weak points can be corrected in the process of bringing the patented technology to market.Postprint (published version
Oriol Pons-Valladares; Albert De La Fuente; Jaume Armengou; Antonio Aguado. Towards the sustainability in the design of wind towers. Energy Procedia 2017, 115, 41 -49.
AMA StyleOriol Pons-Valladares, Albert De La Fuente, Jaume Armengou, Antonio Aguado. Towards the sustainability in the design of wind towers. Energy Procedia. 2017; 115 ():41-49.
Chicago/Turabian StyleOriol Pons-Valladares; Albert De La Fuente; Jaume Armengou; Antonio Aguado. 2017. "Towards the sustainability in the design of wind towers." Energy Procedia 115, no. : 41-49.
If we are to monitor the chemical processes in cementitious materials, then pH assays in the pore solutions of cement pastes, mortars, and concretes are of key importance. However, there is no standard method that regulates the sample-preparation method for pH determination. The state-of-the-art of different methods for pH determination in cementitious materials is presented in this paper and the influence of sample preparation in each case. Moreover, an experimental campaign compares three different techniques for pH determination. Its results contribute to establishing a basic criterion to help researchers select the most suitable method, depending on the purpose of the research. A simple tool is described for selecting the easiest and the most economic pH determination method, depending on the objective; especially for researchers and those with limited experience in this field.
S. Manso; A. Aguado. A review of sample preparation and its influence on pH determination in concrete samples. Materiales de Construcción 2017, 67, 108 .
AMA StyleS. Manso, A. Aguado. A review of sample preparation and its influence on pH determination in concrete samples. Materiales de Construcción. 2017; 67 (325):108.
Chicago/Turabian StyleS. Manso; A. Aguado. 2017. "A review of sample preparation and its influence on pH determination in concrete samples." Materiales de Construcción 67, no. 325: 108.
The new generation of innovative projects has led to the use of greater amounts of reinforcement and the development of concrete with specific characteristics. It is necessary to use a material that ensures the uniformity of the cross section, as well as the adherence of the existing reinforcement, and due to this, the self-consolidating concrete becomes an technique alternative has great potential to achieve these properties. The aim of this paper is to analyze the bond behavior of self-consolidating concrete that was obtained by means of the Beam Test performed within a large experimental campaign of characterization. Four types of SCC were studied with two strength levels (40 MPa and 60MPa) and two different types of granular skeletons, using two specimens at each age (3, 7, and 28 days). All specimens were tested with a corrugated steel bar 10 mm in diameter. The results show that the adhesion tension independently of resistance presents a rapidly evolving at 7 days reached 95% of the total adhesion by 28 days.Postprint (published version
Ana C. P Santos; Antonio Aguado; Noé Villegas. Bond behavior of self consolidating concrete. Revista de la construcción 2016, 15, 9 -16.
AMA StyleAna C. P Santos, Antonio Aguado, Noé Villegas. Bond behavior of self consolidating concrete. Revista de la construcción. 2016; 15 (3):9-16.
Chicago/Turabian StyleAna C. P Santos; Antonio Aguado; Noé Villegas. 2016. "Bond behavior of self consolidating concrete." Revista de la construcción 15, no. 3: 9-16.
Expansions in concrete dams may be caused by chemical or physical sources; however, in certain occasions the evidences observed in the dam may not be attributed to a single cause. Mequinenza is an example of a concrete dam affected by expansions and high nonrecoverable displacements that cannot be explained by the most frequent pathologies. This paper presents new hypotheses that could justify such behavior by assuming the superposition of a global phenomenon of water induced expansion in concrete in the entire dam and a localized effect consisting in the opening of cracks in the construction joints located in one of the blocks. This is validated by conducting numerical analyses through 2D finite element models that consider the nonlinear behavior of the construction joints and use zero-thickness interface elements to simulate the potential cracking planes in the dam. The results confirmed the diagnosis proposed and the capability of the model to reproduce the behavior of the dam, revealing the significant contribution of the opening of the cracks to the non-recoverable displacements in the dam.
A. Campos; C. M. Lopez; A. Blanco; A. Aguado. Structural Diagnosis of a Concrete Dam with Cracking and High Nonrecoverable Displacements. Journal of Performance of Constructed Facilities 2016, 30, 04016021 .
AMA StyleA. Campos, C. M. Lopez, A. Blanco, A. Aguado. Structural Diagnosis of a Concrete Dam with Cracking and High Nonrecoverable Displacements. Journal of Performance of Constructed Facilities. 2016; 30 (5):04016021.
Chicago/Turabian StyleA. Campos; C. M. Lopez; A. Blanco; A. Aguado. 2016. "Structural Diagnosis of a Concrete Dam with Cracking and High Nonrecoverable Displacements." Journal of Performance of Constructed Facilities 30, no. 5: 04016021.
The physical role of water in cement-based materials is observed through the wetting of the grains, the need to fill the voids between particles and to separate these particles from one another, providing fluidity. The objective of this article is to develop a model for quantifying the minimum volume of water necessary to wet the particles in cement-based materials. This model takes into account the compactness of the granular system and the particle size. An experimental program was performed to assess the minimum water required. The results obtained agree with the predictions provided by the model.Peer ReviewedPostprint (published version
Nayara S. Klein; Sergio Henrique Pialarissi Cavalaro; Antonio Aguado; Ignacio Segura; Berenice Toralles. The wetting water in cement-based materials: Modeling and experimental validation. Construction and Building Materials 2016, 121, 34 -43.
AMA StyleNayara S. Klein, Sergio Henrique Pialarissi Cavalaro, Antonio Aguado, Ignacio Segura, Berenice Toralles. The wetting water in cement-based materials: Modeling and experimental validation. Construction and Building Materials. 2016; 121 ():34-43.
Chicago/Turabian StyleNayara S. Klein; Sergio Henrique Pialarissi Cavalaro; Antonio Aguado; Ignacio Segura; Berenice Toralles. 2016. "The wetting water in cement-based materials: Modeling and experimental validation." Construction and Building Materials 121, no. : 34-43.