Eduardo Roji

Universidad del País Vasco / Euskal Herriko Unibertsitatea | UPV/EHU · Mechanic Engineering

Scientific evidence suggests that climate change is increasing the severity and frequency of heat waves. In temperate climate cities, where overheating has not been a common issue, households will increasingly suffer from high indoor temperatures. In this work, the effectiveness of different adaptation strategies is measured according to the improv...

The impacts of climate change, such as extreme events and progressive global warming, threaten the conservation and habitability of urban cultural heritage. Understanding climate risks to heritage must be part of planning and policy decision-making processes to increase the resilience and sustainability of both social and built environmental system...

Eraikuntzako energia-kontsumoak gora egin du azken urteotan. Horregatik, eraikinen energia-eraginkortasunari buruzko araudiak ezarri behar izan dira kontsumoa kontrolatzeko, energia-aurrezpena hobetzeko eta energia-eraginkortasuna hobetzeko. Baina Euskal Autonomia Erkidegoan zaharrak eta energetikoki pobreak diren eraikin kopurua oso altua denez, b...

It is worldwide accepted that climate change is affecting cities and that the conservation of the cultural heritage contributes to sustainable development. However, despite the high level of interest and research in climate-change risks on socioeconomic, urban and natural systems, studies that assess climate change impacts on urban cultural heritag...

A systematic and critical review of the existing literature on climate-change risk-assessment methodologies for historic urban areas is presented, in view of the increasing likelihood of extreme weather events. Key performance indicators are identified for use in future risk assessment methodologies that address both the elements of historic urban...

The need to reduce heat-related thermal stress calls for a reassessment of shading in outdoor urban spaces with the aim of achieving more habitable and sustainable cities. In this research, a methodology based on mathematical formulas is presented and applied to determine the most appropriate geometric properties and position of the trees to be pla...

Pavement deterioration models are a vital feature in any pavement management system since they are capable of predicting the evolution of pavement characteristics. Pavement roughness is measured by most of the highway administrations due to its relation to comfort and safety, generally by means of the International Roughness Index (IRI). The Region...

This article predicts the available minimum skid resistance in the road network of Biscay (Spain) with data collected in the summer season when friction values are at a minimum. Firstly, it was observed that pavement structure does not influence skid resistance. Therefore, roadway segments with available data about the surface layer of single or do...

Pavement performance models play a vital role in any pavement management system. The Regional Government of Biscay (RGB) (Spain) manages a 1200 km road network and conducts pavement data collections, including the International Roughness Index (IRI) values. The aim of the paper is to develop an IRI performance model for two-lane roads with flexible...

Skid resistance is a vital issue in pavement management, mainly in relation to road safety; hence, road agencies must assure a minimum friction level of their road networks. The regional government of Biscay (Spain) uses a sideways force coefficient routine investigation machine to assess the present pavement surface condition and to allocate the a...

Indoor housing temperatures in tropical climates exceed values associated with thermal comfort, whenever mechanical climate-control systems usually are not allowed due electrical restrictions especially in poor areas where infrastructures are inadequate to maintain a standard of living. This study aims to address thermally efficient and sustainable...

A bibliometric analysis based on Scopus database was carried out to identify the global research trends related to pavement management area from 2000 to 2013, and to improve the understanding of the research topics in that period. The results reveal two stable periods of annual publications, from 2000 to 2002 with an average rate of 27, and from 20...

Efficient management of urban transportation systems is a challenge for any local government that wishes to improve public wellbeing and comfort. With that end in mind, this paper proposes a tool for decision making and policy guidance based on multiple-criteria decision-making methods for the sustainability evaluation of urban transportation. The...

Este libro recopila una serie de problemas habituales que se plantean durante la ejecución del movimiento de tierras en las obras civiles, exponiéndose los razonamientos seguidos y las fórmulas a utilizar. El libro tiene un enfoque eminentemente didáctico, en el que se describe la problemática asociada al movimiento de tierras en las obras de ingen...

Aiming to increase sustainability in the field of construction, this study investigates possible alternative materials, considered as by-products, for the manufacture of greener low-strength concretes, intended for the manufacture of Concrete Masonry Units (CMUs); using sawdust in replacement of sand and wood ash and lime mud in replacement of ceme...

Pavement management systems employ pavement performance models to plan the most effective allocation of public funds. The most used models are the deterministic and the probabilistic or stochastic ones. Among stochastic models, the Markov Chains are receiving considerable research attention. In this paper, transition probability matrices (TPMs) are...

Purpose The aim of this paper is to analyze a new structural design applied in industrial frames using two type of steels with different mechanical resistance as behavior against fire, S275 and FR. To do it, they have been taking account variables as intrinsic metallic design, span length, intumescent paint thickness and fire time exposition that...

Transition curves are employed in road projects so as to link tangents and circular curves or circular curves of different radius, being the clothoid the element that is used in the majority of countries. In Spain it is referred as the transition curve to be employed in the road geometric design rules. One of the concepts that is applied in order t...

The management of urban transportation systems represents one of the most formidable challenges for local government that generates several problems related to the well-being and the comfort of the public that commute and travel in their daily life. Improvements to various policies and practical measures can move us closer to the ideal of sustainab...

The implementation of the European Higher Education Area (EHEA) has realigned educational programs. There is therefore a need to adapt to the new student profiles. Knowledge is imparted over shorter periods of time and using innovative educational methodology. The teaching of structural topics in engineering faculties has to adapt to these new teac...

The environmental footprint of the construction industry requires the quantification of new developments to appraise their sustainable contribution. Recent developments in relation to the merging of steel fibre reinforced concrete and self-compacting concrete reveal a promising concrete technology that requires extensive experimental studies to ass...

Few other sectors have such a great impact on sustainability as the construction industry, which has expressed growing concerns in this regard for a long time, mainly focusing on the environmental dimension. The sustainability assessment methodology tested in this study is the Integrated Value Model for Sustainable Assessment – MIVES, applied to in...

The main objective of this work is to produce structural slag mortars of good mechanical strength and workability, while reducing the consumption of Portland clinker, the production of which is a growing source of environmental concern. In this context, the study looks at the preparation of these mortars with steelmaking slags (electric arc furnace...

Double-skin perforated sheet façades, are enclosures composed of a perforated metallic sheet, air chamber and glass, is showing an increasing tendency in modern building design. In a previous research, their thermal behavior was addressed, taking into account several physical parameters such as, perforation rates, colors and materials, as well as t...

Few other sectors have such a great impact on sustainability as the construction industry, in which concerns over the environmental dimension have been growing for some time. The sustainability assessment methodology presented in this paper is an AHP (Analytic Hierarchy Process) based on Multicriteria Decision Making (MCDM) and includes the main su...

The Open University in Spain is one of the world's leading providers of flexible, high-quality online degrees and distance learning or sometimes referred to as " e learning ". Its mission is to be closer to people and places, aiming to provide suitable distance learning for everybody. The university campus is physically centred in Madrid but the in...

The interest of HACFRA (self compacting concrete reinforced with steel fibers), is the combination of the residual strength increase and cracking decrease compared to plain concrete by the introduction of steel fibers in the mass with the advantages of the self-compacting. The paper presents an analysis of the influence of different components of...

New materials with external shading systems are mainly implemented on building façades to improve energy efficiency, but also to add a distinctive appearance. The double-skin perforated sheet-metal façade, an enclosure composed of sheet metal, air chambers and glass, is an example of this tendency in modern building design. The aim of this research...

Nowadays, the ability to adapt to change and to develop innovations represents one of the principal ways of gaining competitive advantage and of surviving in an increasingly global market. Accordingly, innovation has achieved significant consideration as an economic variable and therefore, the possibility to assess the degree of innovation has attr...

This research establishes a correlation between the predicted fiber orientation in Steel Fiber Reinforced Concrete (SFRC) and the flexural behavior of the composite material. It is well known that the proper alignment of fibers in the direction of tensile force enhances the mechanical properties of concrete. As recent studies have corroborated, the...

Steel Fibre Reinforced Concrete (SFRC), a composite construction material, needs reliable prediction and control techniques to promote its use in structural applications. The distribution and orientation of fibres within the concrete matrix plays a major role in the mechanical behaviour of the structural element. Since the observation of those fibr...

The present patents relate to power generating apparatus suitable for use in extracting geothermal energy. The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface. As our reliance on fossil fuels...

This research focuses on the structural applications of steel fiber reinforced concrete (SFRC). Various fibers are first studied, in order to choose the most suitable type in accordance with the specific application. A steel fiber reinforced self-compacting concrete (SFRSCC) mix, designed for improved performance, was used to cast a 3-m-high, 6-m-l...

The most recently work of Álvaro Siza, in Spain, shows us the merits of the structural system in the composition of its forms and spaces, its overhangs and the movement in the alignment of its façades; the creation of the architectonic space and its envelope. The BBK Auditorium consists of a structural system of layered walls, mixed structural sl...

Evidence that the construction sector is aware of sustainability issues may be found in the large number of tools and methodologies that exist to perform sustainability evaluation. The great majority centre on environmental parameters and only in a few cases are economic and social components studied. Within the sector, it is the industrial buildin...

The establishment of a measurement index to define the sustainability in a building is a complex problem due to the several elements that take part on it, as well as different measurement indicators to include: environmental, economic, social. This article focused on the study of a index, that contributes to the sustainability of a building's concr...

The Architecture and Engineering are two sciences that, since long time ago, seems that they have taken separated ways and, nevertheless, is necessary their collaboration for the correct design and construction of present structures. From the Faculty of Engineering of Bilbao, the Area of Engineering of the Construction has assumed this interest, tr...

The search of the maximum levels of sustainability in the construction's process leads us, up today, to the consideration of this concept from the starter phase of design of buildings, and also in the manufacture of the different components that integrates the above mentioned buildings. One of the fundamental scopes of the sustainability is the ene...

The growing importance today of establishing policies orientated towards minimizing the deterioration of our environment for any kind of action we aim to carry out, brings home the need to carry out sustainability studies which accompany these new developments. Development of new economic activities generally leads to the materialization of the cor...

Los nuevos criterios a tener en cuenta para el desarrollo de nuevos espacios industriales no pueden limitarse, en nuestros días, a la búsqueda de un suelo adecuado para estos usos, basada únicamente en cuestiones tales como la oportunidad de terrenos, topografía adecuada, infraestructura de comunicaciones, inversión económica, etc. @@ El concepto d...